Kemet (KEM) 10-K 30 May 19 2019 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2019	May 27, 2019	Sep. 30, 2017
Document and Entity Information
Entity Registrant Name	KEMET CORP
Entity Central Index Key	0000887730
Document Type	10-K
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 1,021,114,987
Entity Common Stock, Shares Outstanding		58,001,480
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 207,918	$ 286,846
Accounts receivable, net (1)	154,059	146,561
Inventories, net	241,129	204,386
Prepaid expenses and other current assets	38,947	41,160
Total current assets (1)	642,053	678,953
Property, plant and equipment, net	495,280	405,316
Goodwill	40,294	40,294
Intangible assets, net	53,749	59,907
Equity method investments	12,925	12,016
Deferred income taxes	57,024	13,837
Other assets (1)	16,770	12,600
Total assets (1)	1,318,095	1,222,923
Current liabilities:
Current portion of long-term debt	28,430	20,540
Accounts payable	153,287	139,989
Accrued expenses (1)	93,761	125,119
Income taxes payable	2,995	2,010
Total current liabilities (1)	278,473	287,658
Long-term debt	266,041	304,083
Other non-current obligations (1)	125,360	152,249
Deferred income taxes (1)	8,806	15,058
Total liabilities (1)	678,680	759,048
Stockholders’ equity:
Preferred stock, par value $0.01, authorized 10,000 shares, none issued	0	0
Common stock, par value $0.01, authorized 175,000 shares, issued 57,822 and 56,641 shares at March 31, 2019 and 2018, respectively	578	566
Additional paid-in capital	465,366	462,737
Retained earnings (1)	204,195	3,370
Accumulated other comprehensive income (loss) (1)	(30,724)	(2,798)
Total stockholders’ equity (1)	639,415	463,875
Total liabilities and stockholders’ equity (1)	$ 1,318,095	$ 1,222,923

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Thousands	Mar. 31, 2019	Mar. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	10,000	10,000
Preferred stock, issued shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	175,000	175,000
Common stock, issued shares	57,822	56,641
Treasury stock, shares	0	611

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 206,587	$ 254,127	$ 47,157
Revenue from Contract with Customer, Excluding Assessed Tax	1,382,818	1,200,181	757,338
Operating costs and expenses:
Cost of sales (1)	924,276	860,744	571,944
Selling, general and administrative expenses	202,642	173,620	107,658
Research and development (1)	44,612	39,114	26,693
Restructuring charges	8,779	14,843	5,404
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	1,660	(992)	10,671
Net (gain) loss on sales and disposals of assets	700	(1,200)	400
Total operating costs and expenses (1)	1,181,969	1,087,329	722,370
Operating income (1)	200,849	112,852	34,968
Non-operating (income) expense:
Interest income	(2,035)	(809)	(24)
Interest expense	21,239	32,882	39,755
Business combination bargain purchase, gain recognized	0	130,880	0
Change in value of TOKIN options	0	0	(10,700)
Other (income) expense, net	11,214	24,592	(3,871)
Income before income taxes and equity income (loss) from equity method investments (1)	170,431	187,067	9,808
Income tax expense (benefit) (1)	(39,460)	9,132	4,294
Income before equity income (loss) from equity method investments (1)	209,891	177,935	5,514
Equity income (loss) from equity method investments	$ (3,304)	$ 76,192	$ 41,643
Net income (loss) per basic share:
Net income (loss) (in dollars per share)	$ 3.57	$ 4.81	$ 1.01
Net income (loss) per diluted share:
Net income (loss) (in dollars per share)	3.50	4.33	0.85
Common Stock, Dividends, Per Share, Declared	$ 0.10	$ 0	$ 0
Weighted-average shares outstanding:
Weighted Average Number of Shares Issued, Basic	57,840	52,798	46,552
Diluted (in shares)	59,082	58,640	55,389

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Net income (loss) (1)	$ 206,587	$ 254,127	$ 47,157
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(24,065)		(15,284)
Other comprehensive income (loss) before reclassifications	(28,959)	41,867
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(927)	167	163
Other comprehensive income (loss), net of tax:
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	(86)	(255)	20
Other Comprehensive Income (Loss) from Equity Method Investments			1,440
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(588)	(1,753)	3,274
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net	(2,249)	0	0
Other comprehensive income (loss) (2)	(27,926)	39,014	(10,387)
Total comprehensive income (1)	178,661	293,141	$ 36,770
Foreign currency translation gains (losses) (2)
Other comprehensive income (loss) before reclassifications	(19,835)	35,271
Defined benefit pension plans
Other comprehensive income (loss) before reclassifications	(1,525)	409
Defined benefit post-retirement plan adjustments
Other comprehensive income (loss) before reclassifications	81	(64)
Equity interest in investee’s other comprehensive income (loss)
Other comprehensive income (loss) before reclassifications	(11)	5,584
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Other comprehensive income (loss) before reclassifications	$ (1,286)	$ 667

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance (in shares) at Mar. 31, 2016		45,897
Balance at Mar. 31, 2016	$ 112,481	$ 465	$ 452,821	$ (299,510)	$ (31,425)	$ (9,870)
Increase (Decrease) in Stockholders' Equity
Net income (loss) (1)	47,157	0	0		0	0
Other comprehensive income (loss)	(10,387)	0	0	0	(10,387)	0
Issuance of shares	(128)	$ 2	(10,000)	0	0	9,870
Issuance of restricted shares (in shares)		792
Stock-based compensation	4,720		4,720
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	1,726		130	1,596
Balance (in shares) at Mar. 31, 2017		46,689
Balance at Mar. 31, 2017	155,569	$ 467	447,671	(250,757)	(41,812)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss) (1)	254,127	0	0		0	0
Other comprehensive income (loss)	39,014	0	0	0	39,014	0
Issuance of shares	8,142	$ 99	8,043	0	0	0
Issuance of restricted shares (in shares)		9,952
Stock-based compensation	7,657		7,657
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		$ 0		0	0	0
Offering Fees	634		634
Balance (in shares) at Mar. 31, 2018		56,641
Balance at Mar. 31, 2018	463,875	$ 566	462,737	3,370	(2,798)	0
Increase (Decrease) in Stockholders' Equity
Net income (loss) (1)	206,587	0	0		0	0
Other comprehensive income (loss)	(27,926)	0	0	0	(27,926)	0
Issuance of shares	(10,225)	$ 12	(10,237)	0	0	0
Issuance of restricted shares (in shares)		1,181
Dividends, Common Stock, Cash	(5,762)
Stock-based compensation	12,866		12,866
Balance (in shares) at Mar. 31, 2019		57,822
Balance at Mar. 31, 2019	$ 639,415	$ 578	$ 465,366	$ 204,195	$ (30,724)	$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 207,918	$ 286,846	$ 109,774
Restricted Cash	0	0	0
Operating activities:
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	206,587	254,127	47,157
Adjustments to reconcile net income to net cash provided by (used in) operating activities, net of effect of acquisitions:
Depreciation and amortization (1)	52,628	50,661	38,151
Stock-based compensation expense	3,304	(76,192)	(41,643)
Business combination bargain purchase, gain recognized	0	(130,880)	0
Non-cash debt and financing costs	1,872	2,467	761
Loss on early extinguishment of debt	15,946	486	0
Change in value of TOKIN options	0	0	(10,700)
Net (gain) loss on sales and disposals of assets	700	(1,200)	400
Stock-based compensation expense	12,866	7,657	4,720
Pension and other post-retirement benefits	4,938	4,717	2,543
Change in deferred income taxes (1)	(49,757)	564	(15)
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	1,660	(992)	10,671
Rent receivable	0	2,645	0
Other, net (1)	(285)	(680)	(392)
Changes in assets and liabilities, net of the effect of acquisitions:
Accounts receivable (1)	(8,910)	30,217	(2,630)
Inventories	(42,806)	(13,827)	16,805
Prepaid expenses and other assets	(4,381)	4,330	(1,769)
Accounts payable	7,650	(16,053)	6,170
Accrued income taxes	1,046	1,317	144
Other operating liabilities (1)	(70,627)	197	1,694
Net cash provided by (used in) operating activities	131,731	120,761	71,667
Investing activities:
Capital expenditures	(146,056)	(65,004)	(25,617)
Contributions to equity method investments	(4,000)	(3,000)	0
Proceeds from dividend	776	2,745	0
Acquisitions, net of cash received	0	(163,985)	0
Proceeds from sale of discontinued operations		3,400
Proceeds from sale of assets	2,268	3,638	19
Net cash provided by (used in) investing activities	(147,012)	102,364	(25,598)
Financing activities:
Proceeds from revolving line of credit	0	0	12,000
Payments of revolving line of credit	0	(33,881)	(12,000)
Proceeds from issuance of debt	298,336	334,978	2,314
Payment of long-term debt	(344,461)	(365,938)	(2,428)
Payment for Debt Extinguishment or Debt Prepayment Cost	(3,234)	0	0
Debt issuance costs	(2,021)	(5,002)	0
Proceeds from exercise of stock options	485	5,207	1,133
Proceeds from exercise of stock warrants	0	8,838	0
Purchase of treasury stock	0	0	(1,144)
Payments of Ordinary Dividends, Common Stock	(5,762)	0	0
Net cash provided by (used in) financing activities	(56,657)	(55,798)	(125)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(71,938)	167,327	45,944
Effect of foreign currency fluctuations on cash (2)	(6,990)	9,745	(1,174)
Cash, cash equivalents, and restricted cash at end of fiscal year	207,918	286,846	109,774
Supplemental Cash Flow Statement Information:
Interest paid, net of capitalized interest	11,965	44,905	38,922
Income taxes paid	$ 10,863	$ 7,120	$ 4,153

Organization and Significant Ac

Organization and Significant Accounting Policies	12 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Organization and Significant Accounting Policies	Organization and Significant Accounting Policies Nature of Business and Organization KEMET Corporation, which together with its subsidiaries is referred to herein as “KEMET” or the “Company” is a leading manufacturer of tantalum capacitors, multilayer ceramic capacitors, film capacitors, electrolytic capacitors, paper capacitors and solid aluminum capacitors, and Electro-Magnetic Compatible ("EMC") devices, sensors, and actuators. The Company is headquartered in Fort Lauderdale, Florida and has manufacturing plants and distribution centers located in the United States, Mexico, Europe and Asia. Additionally, the Company has wholly-owned foreign subsidiaries which primarily provide sales support for KEMET’s products in foreign markets. KEMET is organized into three reportable segments: the Solid Capacitor Reportable Segment (“Solid Capacitors”), the Film and Electrolytic Reportable Segment (“Film and Electrolytic”) and the Electro-Magnetic, Sensors, and Actuators Reportable Segment ("MSA"). Each reportable segment is responsible for the operations of certain manufacturing sites as well as related research and development efforts. Basis of Presentation Certain amounts for the Consolidated Statements of Operations for fiscal years 2018 and 2017 have been revised to conform with the fiscal year 2019 presentation. Principles of Consolidation The accompanying Consolidated Financial Statements of the Company include the accounts of its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Investment in entities in which the Company can exercise significant influence, but does not own a majority equity interest or otherwise control, are accounted for using the equity method and are included as equity method investments on the consolidated balance sheets. Cash Equivalents Cash equivalents of $60.7 million and $83.9 million at March 31, 2019 and 2018 , respectively, consist of money market accounts and certificates of deposits with original terms of three months or less. The Company considers all liquid debt instruments with original maturities of three months or less to be cash equivalents. Inventories Inventories are stated at the lower of cost or net realizable value. The Company maintains reserves for excess and slow-moving inventory to reflect a carrying amount for inventory that is stated at the lower of cost or net realizable value. The inventory reserve is an estimate and is adjusted based on slow moving and excess inventory, historical shipments, customer forecasts and backlog, and technology developments. Raw materials and tool crib obsolescence reserves are based on usage over one and two years, respectively, and the Company maintains reserves for raw materials and tool cribs that exceed these ages. Finished goods obsolescence reserves are either based on product age limits determined by market requirements, and/or based on excess quantities that exceed product orders and historical product sales. Inventory costs include material, labor and manufacturing overhead and most inventory costs are determined by the “first-in, first-out” (“FIFO”) method. For tool crib, a component of the Company’s raw material inventory, cost is determined under the average cost method. The Company has consigned inventory at certain customer locations totaling $9.5 million and $8.1 million at March 31, 2019 and 2018 , respectively. Property, Plant and Equipment Property, plant, and equipment are stated at cost. Depreciation is calculated principally using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are amortized using the straight-line method over the shorter of the estimated useful lives of the assets or the terms of the respective leases. Maintenance costs are expensed and expenditures for renewals and improvements are generally capitalized. Upon sale or retirement of property and equipment, the related cost and accumulated depreciation are removed, and any gain or loss is recognized. A long-lived asset classified as held for sale is initially measured and reported at the lower of its carrying amount or fair value less cost to sell. Long-lived assets to be disposed of other than by sale are classified as held and used until the long-lived asset is disposed of. Depreciation expense, including amortization of capital leases, was $46.7 million , $45.5 million and $35.0 million for the fiscal years ended March 31, 2019 , 2018 and 2017 , respectively. The Company evaluates long-lived assets for impairment whenever certain events or changes in circumstances may indicate that the recoverability of the carrying amount of property, plant, and equipment should be assessed, including, among others, a significant decrease in market value, a significant change in the business climate in a particular market, or a current period operating or cash flow loss combined with historical losses or projected future losses. Reviews are regularly performed to determine whether facts and circumstances exist which indicate the carrying amount of assets may not be recoverable. If any impairment indicators are determined to exist, the Company assesses the recoverability of its assets by comparing the projected undiscounted net cash flows associated with the related asset or group of assets over their remaining lives against their respective carrying amounts. If it is determined that the book value of a long-lived asset or asset group is not recoverable, an impairment loss would be calculated equal to the excess of the carrying amount of the long-lived asset over its fair value. The Company must make certain assumptions as to the future cash flows to be generated by the underlying assets. Those assumptions include the amount of volume increases, average selling price decreases, anticipated cost reductions, and the estimated remaining useful life of the equipment. Future changes in assumptions may negatively impact future valuations. Fair market value is based on the discounted cash flows that the assets will generate over their remaining useful lives or other valuation techniques. See Note 8 , “(Gain) loss on write down and disposal of long-lived assets” for further discussion of property, plant and equipment impairment charges. Goodwill and Other Intangible Assets Goodwill and other intangible assets with indefinite useful lives are not amortized but are subject to annual impairment tests during the fourth quarter of each fiscal year and when otherwise warranted. The Company evaluates its goodwill on a reporting unit basis, which requires the Company to estimate the fair value of the reporting unit. The impairment test involves a comparison of the fair value of each reporting unit, with the corresponding carrying amounts. If the reporting unit’s carrying amount exceeds its fair value, then an indication exists that the reporting unit’s goodwill and intangible assets with indefinite useful lives may be impaired. The impairment to be recognized is measured by the amount by which the carrying value of the reporting unit’s goodwill being measured exceeds its implied fair value. The implied fair value of goodwill is the excess of the fair value of the reporting unit over the sum of the amounts assigned to identified net assets. As a result, the implied fair value of goodwill is generally the residual amount that results from subtracting the value of net assets, including all tangible assets and identified intangible assets, of the reporting unit’s fair value. The Company determines the fair value of its reporting units using an income-based, discounted cash flow (“DCF”) analysis, and market-based approaches (Guideline Publicly Traded Company Method and Guideline Transaction Method) which examine transactions in the marketplace involving the sale of the stocks of similar publicly owned companies, or the sale of entire companies engaged in operations similar to KEMET. The Company evaluates the value of its other indefinite-lived intangible assets (trademarks) using an income-based, relief from royalty analysis. In addition to the previously described reporting unit valuation techniques, the Company’s goodwill and intangible assets with indefinite useful lives impairment assessment also considers the Company’s aggregate fair value based upon the value of the Company’s outstanding shares of common stock. The impairment review of goodwill and intangible assets with indefinite useful lives are subjective and involve the use of estimates and assumptions. Estimates of business enterprise fair value use discounted cash flow and other fair value appraisal models and involve making assumptions for future sales trends, market conditions, growth rates, cost reduction initiatives and cash flows for the next several years. Future changes in assumptions may negatively impact future valuations. Equity Method Investments Investments and ownership interests are accounted for under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. Investments accounted for under the equity method are initially recorded at cost, and the difference between the basis of the Company’s investment and the underlying equity in the net assets of the company at the investment date, is amortized over the lives of the related assets that gave rise to the difference. The Company’s share of earnings or losses under the equity method investments and basis difference amortization is reported in the consolidated statements of operations as “Equity income (loss) from equity method investments.” The Company reviews its investments and ownership interests accounted for under the equity method of accounting for impairment whenever events or changes in circumstances indicate a loss in the value of the investment may be other than temporary. Deferred Income Taxes The Company accounts for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the fiscal years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company periodically evaluates its net deferred tax assets based on an assessment of historical performance, ability to forecast future events, and the likelihood that the Company will realize the benefits through future taxable income. Valuation allowances are recorded to reduce the net deferred tax assets to the amount that is more likely than not to be realized. The Company makes certain estimates and judgments in the calculation for the provision for income taxes, in the resulting tax liabilities, and in the recoverability of deferred tax assets. All deferred tax assets are reported as noncurrent in the Consolidated Balance Sheets. Stock-based Compensation Stock-based compensation for stock options is estimated on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes model considers volatility in the price of the Company’s stock, the risk-free interest rate, the estimated life of the equity-based award, the closing market price of the Company’s stock on the grant date and the exercise price. The estimates utilized in the Black-Scholes calculation involve inherent uncertainties and the application of management judgment. The Company's stock options were fully expensed during the fiscal year ended March 31, 2017. Upon adoption of Accounting Standard Update (“ASU”) No. 2016-09, Compensation Stock-Compensation, the Company elected to discontinue estimating forfeitures. Stock-based compensation cost for restricted stock is measured based on the closing fair market value of the Company’s common stock on the date of grant. The Company recognizes stock-based compensation cost for arrangements with cliff vesting as expense ratably on a straight-line basis over the requisite service period. The Company recognizes stock-based compensation cost for arrangements with graded vesting as expense on an accelerated basis over the requisite service period. Concentrations of Credit and Other Risks The Company sells to customers globally. Credit evaluations of its customers’ financial condition are performed periodically, and the Company generally does not require collateral from its customers. There were no customers’ accounts receivable balances exceeding 10% of gross accounts receivable at March 31, 2019 or March 31, 2018 . Consistent with industry practice, the Company utilizes electronics distributors for a large percentage of its sales. Electronics distributors are an effective means to distribute the products to end-users. For fiscal years ended March 31, 2019 , 2018 , and 2017 , net sales to electronics distributors accounted for 42.2% , 39.2% and 46.8% , respectively, of the Company’s total net sales. One distributor, TTI, Inc., accounted for $184.3 million , $133.5 million and $104.4 million of the Company’s net sales in fiscal years ended March 31, 2019 , 2018 , and 2017 , respectively. Foreign Subsidiaries The Company translates the assets and liabilities of its foreign subsidiaries from their respective functional currencies to U.S. dollars at the appropriate spot rates as of the balance sheet date. Generally, our foreign subsidiaries use the local currency as their functional currency. Changes in the carrying value of these assets and liabilities attributable to fluctuations in spot rates are recognized as a component of equity in accumulated other comprehensive income ("AOCI"). Results of operations accounts are translated using average exchange rates for the year. Assets and liabilities denominated in a currency that is different from a reporting entity's functional currency must first be remeasured from the applicable currency to the legal entity's functional currency. The effect of this remeasurement process is recognized in the Consolidated Statements of Operations. Comprehensive Income (Loss) Comprehensive income (loss) consists of net income, foreign currency translation gains (losses), post-retirement and defined benefit plan adjustments including those adjustments which result from changes in net prior service credit and actuarial gains (losses), equity interest in investee’s other comprehensive income (loss), gains (losses) on foreign exchange contracts, and gains (losses) on the excluded component of fair value hedges. Comprehensive income is presented in the Consolidated Statements of Comprehensive Income (Loss). The following summary sets forth the components of accumulated other comprehensive income (loss) contained in the stockholders’ equity section of the Consolidated Balance Sheets (amounts in thousands): Foreign Currency Translation, net of Tax (1)(2) Post-Retirement Benefit Plan Adjustments, net of Tax Defined Benefit Pension Plans, net of Tax (3)(4) Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss), net of Tax Foreign Exchange Contracts, net of Tax Excluded Component of Fair Value Hedges, net of Tax Net Accumulated Other Comprehensive Income (Loss) Balance at March 31, 2017 $ (25,556 ) $ 1,134 $ (14,998 ) $ (5,299 ) $ 2,907 $ — $ (41,812 ) Other comprehensive income (loss) before reclassifications 35,271 (64 ) 409 5,584 667 — 41,867 Amounts reclassified out of AOCI — (191 ) (242 ) — (2,420 ) — (2,853 ) Other comprehensive income (loss) 35,271 (255 ) 167 5,584 (1,753 ) — 39,014 Balance at March 31, 2018 9,715 879 (14,831 ) 285 1,154 — (2,798 ) Other comprehensive income (loss) before reclassifications (5) (19,835 ) 81 (1,525 ) (11 ) (1,286 ) (6,383 ) (28,959 ) Amounts reclassified out of AOCI (4,230 ) (167 ) 598 — 698 4,134 1,033 Other comprehensive income (loss) (24,065 ) (86 ) (927 ) (11 ) (588 ) (2,249 ) (27,926 ) Balance at March 31, 2019 $ (14,350 ) $ 793 $ (15,758 ) $ 274 $ 566 $ (2,249 ) $ (30,724 ) _______________________________________________________________________________ (1) There were no significant tax effects associated with the cumulative currency translation gains and losses as of March 31, 2019 , 2018 , and 2017 . (2) Other comprehensive income (loss) before reclassifications for the year ended March 31, 2018 and the balance at March 31, 2018 adjusted due to the adoption of ASC 606. (3) Ending balance is net of a tax benefit of $2.4 million , $2.3 million , and $2.7 million as of March 31, 2019 , 2018 , and 2017 , respectively. (4) Activity for the years ended March 31, 2019 and 2018 are net of a tax expense of $0.2 million and $0.4 million , respectively. (5) Foreign currency translation includes gains of $5.0 million related to a derivative instrument accounted for as a net investment hedge. Refer to Note 12 , Derivatives, for further information. Fair Value Measurement The Company utilizes three levels of inputs to measure the fair value of (a) nonfinancial assets and liabilities that are recognized or disclosed at fair value in the Company’s consolidated financial statements on a recurring basis (at least annually) and (b) all financial assets and liabilities. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The first two inputs are considered observable and the last is considered unobservable. The levels of inputs are as follows: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Assets and liabilities are measured at fair value on a recurring basis as of March 31, 2019 and 2018 are as follows (amounts in thousands): Carrying Value March 31, Fair Value March 31, Fair Value Measurement Using Carrying Value March 31, Fair Value March 31, Fair Value Measurement Using 2019 2019 Level 1 Level 2 (3) Level 3 2018 2018 Level 1 Level 2 (3) Level 3 Assets (Liabilities): Money markets (1)(2) $ 60,687 $ 60,687 $ 60,687 $ — $ — $ 83,891 $ 83,891 $ 83,891 $ — $ — Derivative assets 5,141 5,141 — 5,141 — 1,154 1,154 — 1,154 — Derivative liabilities — — — — — — — — — — Total debt (294,471 ) (303,170 ) — (303,170 ) — (324,623 ) (343,125 ) — (343,125 ) — _______________________________________________________________________________ (1) Included in the line item “Cash and cash equivalents” on the Consolidated Balance Sheets. (2) Certificates Deposits of $32.2 million and $33.9 million that mature in three months or less are included within the balance as of March 31, 2019 and 2018 , respectively. (3) Fair value for derivative assets and liabilities was determined by using a third-party matrix-pricing model that uses significant inputs derived from or corroborated by observable market data. Where applicable, these models discount future cash flow amounts using market-based observable inputs, including interest rate yield curves, and forward and spot prices for currencies. Fair value for total debt was determined by using a discounted cash flow based on current market interest rates. Revenue Recognition The Company recognizes revenue under the guidance provided in ASC 606. Consistent with the terms of ASC 606, the Company records revenue on product sales in the period in which the Company satisfies its performance obligation by transferring control over a product to a customer. The amount of revenue recognized reflects the consideration the Company expects to receive in exchange for transferring products to a customer. The Company has elected the practical expedient under ASC 606-10-32-18 and does not consider the effects of a financing component on the promised amount of consideration because the period between when the Company transfers a product to a customer and when the customer pays for that product is one year or less. As performance obligations are expected to be fulfilled in one year or less, the Company has elected the practical expedient under ASC 606-10-50-14 and has not disclosed information relating to remaining performance obligations. The Company sells its products to distributors, original equipment manufacturers (“OEM”), and electronic manufacturing services providers (“EMS”), and the sales price may include adjustments for sales discounts, price adjustments, and sales allowances. The Company has elected the practical expedient under ASC 606-10-10-4 and evaluates these sales-related adjustments on a portfolio basis. The principle forms of these adjustments include: • Inventory price protection and ship-from stock and debit (“SFSD”) programs, • Distributor rights of returns, • Sales allowances, and • Limited assurance warranties The Company's inventory price protection and SFSD programs provide authorized distributors with the flexibility to meet marketplace prices by allowing them, upon a pre-approved case-by-case basis, to adjust their purchased inventory cost to correspond with current market demand. KEMET's SFSD program is specific to certain distributors within the Americas and EMEA regions. Requests for SFSD adjustments are considered on an individual basis, require a pre-approved cost adjustment quote from their local KEMET sales representative, and apply only to a specific customer, part, specified special price amount, specified quantity, and are only valid for a specific period of time. To estimate potential SFSD adjustments corresponding with current period sales, KEMET records a sales reserve based on historical SFSD credits, distributor inventory levels, and certain accounting assumptions, all of which are reviewed quarterly. Select distributors have the right to return a certain portion of their purchased inventory to KEMET from the previous fiscal quarter. The Company estimates future returns based on historical return patterns and records a corresponding right of return asset and refund liability as a component of the line items, “Inventories, net” and “Accrued expenses,” respectively, on the Condensed Consolidated Balance Sheets. The Company also offers volume-based rebates on a case-by-case basis to certain customers in each of the Company’s sales channels. The Company's sales allowances are recognized as a reduction in the line item “Net sales” on the Consolidated Statements of Operations, while the associated reserves are included in the line item “Accounts receivable, net” on the Consolidated Balance Sheets. Estimates used in determining sales allowances are subject to various factors. This includes, but is not limited to, changes in economic conditions, pricing changes, product demand, inventory levels in the supply chain, the effects of technological change, and other variables that might result in changes to the Company’s estimates. The Company provides a limited assurance warranty on products that meet certain specifications to select customers. The warranty coverage period is generally limited to one year for United States based customers and a length of time commensurate with regulatory requirements or industry practice outside the United States. A warranty cannot be purchased by the customer separately and, as a result, product warranties are not considered to be separate performance obligations. The Company’s liability under these warranties is generally limited to a replacement of the product or refund of the purchase price of the product. The Company recognizes warranty costs when losses are both probable and reasonably estimable. Warranty costs were not material for the fiscal years ended March 31, 2019 , 2018 and 2017 . Disaggregation of Revenue Refer to Note 7 , “ Reportable Segment and Geographic Information” for revenue disaggregated by primary geographical market, sales channel, and major product line. Contract liabilities Contract liabilities consist of advance payments from certain customers within the OEM channel for the development of additional production capacity. The current and noncurrent portions of these liabilities are included as a component of the line items, “Accrued expenses” and “Other non-current obligations,” respectively, on the Consolidated Balance Sheets. The balance of net contract liabilities consisted of the following at March 31, 2019 and 2018 (amounts in thousands): March 31, 2019 March 31, 2018 Contract liabilities - current (Accrued expenses) $ 256 $ 256 Contract liabilities - noncurrent (Other non-current obligations) — 513 Total contract liabilities $ 256 $ 769 For the fiscal years ended March 31, 2019 , 2018 and 2017 , the Company recognized revenue of $0.9 million , $0.3 million , and $0.2 million , respectively, related to contract liabilities. Revenue related to contract liabilities is recorded on the Consolidated Statements of Operations in the line item, "Net sales." Contract assets The Company recognizes an asset from the costs incurred to fulfill a contract if those costs directly relate to an existing or anticipated contract or specific business opportunity, if the costs enhance our own resources that will be used in satisfying performance obligations in the future, and the costs are expected to be recovered through subsequent sale of product to the customer. The Company has determined that certain direct labor, materials, and allocations of overhead incurred within research and development activities meet the requirements to be capitalized. As most of our contracts and customer specific business opportunities do not include a stated term, the Company amortizes these capitalized costs over the expected product life cycle, which is consistent with the estimated transfer of goods to the customer. Capitalized contract costs were $1.6 million and $2.2 million at March 31, 2019 and 2018 , respectively. Capitalized contracts costs are recorded on the Consolidated Balance Sheets in the line item, “Other assets.” Amortization expense related to contract costs for the fiscal years ended March 31, 2019 , 2018 and 2017 was $0.8 million , $0.9 million , and $0.8 million , respectively. There was no impairment loss in relation to the costs capitalized for the fiscal years ended March 31, 2019 , 2018 and 2017 . Amortization expense related to contract assets is recorded on the Consolidated Statements of Operations line item "Cost of sales." Allowance for Doubtful Accounts The Company evaluates the collectability of trade receivables through the analysis of customer accounts. When the Company becomes aware that a specific customer has filed for bankruptcy, has begun closing or liquidation proceedings, has become insolvent or is in financial distress, the Company records a specific allowance for the doubtful account to reduce the related receivable to the amount the Company believes is collectible. If circumstances related to specific customers change, the Company’s estimates of the recoverability of receivables could be adjusted. Accounts are written off after all means of collection, including legal action, have been exhausted. Shipping and Handling Costs The Company’s shipping and handling costs are reflected in the line item “Cost of sales,” on the Consolidated Statements of Operations. Shipping and handling costs were $31.0 million , $21.4 million , and $16.4 million in the fiscal years ended March 31, 2019 , 2018 and 2017 , respectively. Advertising Costs The Company expenses advertising costs in the period in which the expenditures are incurred. Advertising costs reflected in the line item "Selling, general and administrative expenses" in our Consolidated Statements of Operations were $2.5 million , $2.4 million , and $1.3 million in fiscal years ended March 31, 2019 , 2018 and 2017 , respectively. Income per Share Basic income per share is computed using the weighted-average number of shares outstanding. Diluted income per share is computed using the weighted-average number of shares outstanding adjusted for the incremental shares attributed to the warrant issued in May 2009 to K Financing, LLC by the Company (the “Platinum Warrant”) and outstanding employee stock grants if such effects are dilutive. On September 11, 2017, the Platinum Warrant was exercised in full. Grants Income The Company from time to time enters into contracts to perform projects in which governmental agencies agree to reimburse the Company for certain expenses incurred on the projects. The Company recognizes revenue from government grants when it is probable that the Company will comply with the conditions attached to the grant agreement and the grant proceeds will be received. Additionally, from time to time the Company receives interest free loans from governmental agencies in consideration of the Company making investments in operations in certain locations. As the loans are interest free, the Company records deferred grant income for the difference between the gross loan proceeds and the present value of the debt at the time it is issued. The deferred grant income is amortized over the life of the loans. During the fiscal years ended March 31, 2019 and 2018 , the Company recognized $4.6 million and $0.8 million , respectively, as grant income within other (income) expense, net. Environmental Cost The Company recognizes liabilities for environmental remediation when it is probable that a liability has been incurred and can be reasonably estimated. The Company determines its liability on a site-by-site basis, and it is not discounted or reduced for anticipated recoveries from insurance carriers. In the event of anticipated insurance recoveries, such amounts would be presented on a gross basis in other current or non-current assets, as appropriate. Expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Derivative Financial Instruments The Company, when deemed appropriate, uses derivatives as a risk management tool to mitigate the potential impact of certain market risks. The primary market risk managed by the Company through the use of derivative financial instruments is foreign currency exchange risk. All derivatives are carried at fair value in our Consolidated Balance Sheets. See Note 12 , " Derivatives," for further discussion of derivative financial instruments. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make a number of estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. In addition, they affect the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include impairment of property and equipment, intangibles and goodwill, allowances for doubtful accounts, price protection and customers’ returns, deferred income taxes, and assets and obligations related to employee benefits. Actual results could differ from these estimates and assumptions. Impact of Recently Issued Accounting Standards In August 2018, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2018-15, Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract. This ASU amends the definition of a hosting arrangement and requires a customer in a hosting arrangement that is a service contract to capitalize certain implementation costs as if the arrangement was an internal-use software project. Under this ASU, a customer will apply ASC 350-40 to determine whether to capitalize implementation costs of the cloud computing arrangement th

Acquisitions

Acquisitions	12 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisitions	Acquisitions Sale of Electro-Mechanical Business and Acquisition of Remaining Interest in TOKIN Between February 1, 2013 and April 19, 2017, KEMET, through its wholly-owned subsidiary, KEMET Electronics Corporation (“KEC”), held a 34% economic interest in TOKIN Corporation (“TOKIN”) pursuant to a Stock Purchase Agreement (the “Stock Purchase Agreement”) by and among KEC, TOKIN and NEC Corporation (“NEC”), as calculated based on the number of common shares held by KEC, directly and indirectly, in proportion to the aggregate number of common and preferred shares of TOKIN outstanding as of such date. TOKIN was established in Japan in 1938 and is engaged in production and distribution of tantalum capacitors, transmitting communication devices, magnetic devices, piezoelectric devices and sensors. TOKIN has six manufacturing locations throughout Asia and was previously operating as a joint venture with NEC. On April 14, 2017, TOKIN closed on the sale of its electro-mechanical devices (“EMD”) business to NTJ Holdings 1 Ltd. (“NTJ”), a special purpose entity that is owned by funds managed or operated by Japan Industrial Partners, Inc. (“JIP”), pursuant to a master sale and purchase agreement (the “EMD Master Sale and Purchase Agreement”) previously entered into between TOKIN, NTJ and JIP (“Sale of EMD”). The initial selling price for EMD was JPY 48.2 billion , or approximately $431.0 million , using the March 31, 2017 exchange rate of 111.823 Japanese Yen to 1.00 U.S. Dollar, and was subject to certain working capital adjustments. In the third quarter of fiscal year 2018, the selling price was adjusted by JPY 1.1 billion or approximately $10.1 million (using the December 31, 2017 exchange rate of 112.574 Japanese Yen to 1.00 U.S. Dollar) related to working capital and other adjustments in accordance with the EMD Master Sale and Purchase Agreement. At the closing of the Sale of EMD, TOKIN used a portion of the sale proceeds to repay debt related to a shareholder loan from NEC. The TOKIN historical balance sheet was adjusted to reflect the removal of net assets sold and other items directly impacted by the Sale of EMD. Additionally, due to KEMET’s 34% equity interest in TOKIN held as of the closing, adjustments have been made to reflect KEMET’s accounting for the Sale of EMD in accordance with the equity method of accounting. On April 19, 2017, pursuant to a stock purchase agreement (the “TOKIN Purchase Agreement”) dated February 23, 2017 between KEC and NEC, KEC completed its acquisition, subject to final purchase price adjustment, of the remaining 66% economic interest in TOKIN, and as a result, TOKIN is now a 100% owned indirect subsidiary of KEMET (the “TOKIN Acquisition”). Under the terms of the TOKIN Purchase Agreement, KEC paid NEC JPY 16.2 billion , or approximately $148.6 million (using the April 19, 2017 exchange rate of 109.007 Japanese Yen to 1.00 U.S. Dollar), for all of the outstanding shares of TOKIN it did not already own. The preliminary purchase price was comprised of JPY 6.0 billion , or approximately $55.0 million (using the April 19, 2017 exchange rate of 109.007 Japanese Yen to 1.00 U.S. Dollar) plus JPY 10.2 billion , or approximately $93.6 million , which represented one-half of the estimated excess net cash proceeds (“Excess Cash”) from the Sale of EMD. The acquisition price was subject to working capital adjustments pursuant to the EMD Master Sale and Purchase Agreement. As a result of these working capital adjustments, the acquisition price was increased by JPY 0.3 billion , or approximately $3.0 million (using the September 30, 2017 exchange rate of 112.502 Japanese Yen to 1.00 U.S. Dollar) in the second quarter of fiscal year 2018. There will be no more working capital adjustments under the purchase agreement. The acquisition of TOKIN has expanded KEMET’s geographic presence, combining KEMET’s presence in the western hemisphere and TOKIN’s excellent position in Asia to enhance customer reach and created an entrance into Japan for KEMET. The Company believes TOKIN’s product portfolio is a strong complement to KEMET’s existing product portfolio and believes the combination has created a leader in the combined polymer and tantalum capacitors market. The acquisition also enhanced KEMET’s product diversification with entry into EMC devices, as well as sensors and actuators. With the increased scale, the Company has achieved synergies by optimizing costs through competitive raw materials sourcing and maximizing operating efficiencies. Consistent with expectations, the acquisition has been accretive to earnings with improvement in Net income, Adjusted EBITDA and cash flow. TOKIN’s tantalum capacitor business is included within KEMET’s Solid Capacitor reportable segment (“Solid Capacitors”) and the remainder of TOKIN’s business formed a new reportable segment for KEMET, Electro-Magnetic, Sensors, and Actuators (“MSA”). The following table shows the components of the acquisition price (amounts in thousands): Upfront cash consideration (1) $ 148,614 Excess cash payment (2) 3,144 Indemnity asset (3) 8,500 Less: Put option (4) (9,900 ) Net consideration transferred $ 150,358 _______________________________________________ (1) The upfront cash payment was comprised of JPY 6.0 billion plus one half of Excess Cash in an amount of approximately JPY 10.2 billion , approximately $55.0 million and $93.6 million (using the April 19, 2017 exchange rate of 109.007 Japanese Yen to 1.00 U.S. Dollar), respectively. (2) The additional amount paid to NEC Corporation upon the settlement of the adjusted purchase price for the EMD sale. (3) Pursuant to the Stock Purchase Agreement between KEMET and NEC, NEC was required to indemnify TOKIN and/or KEC for any breaches by TOKIN or NEC of certain representations, warranties and covenants in the Stock Purchase Agreement. NEC’s aggregate liability for indemnification claims was limited to $25.0 million . Prior to the acquisition, KEMET's equity method investment balance included an $8.5 million indemnification asset pursuant to this indemnification arrangement. In connection with the TOKIN Acquisition, NEC was released from its indemnification obligations to KEMET without an exchange of consideration; as such, this amount of released obligation was included as purchase consideration by KEMET. (4) Pursuant to the option agreement, dated as of March 12, 2012, by and among NEC and KEMET (the “Option Agreement”), from April 1, 2015 through May 31, 2018, NEC had the right to require KEC to purchase all outstanding capital stock of TOKIN (the “Put Option”). The fair value of the Put Option of $9.9 million was reflected as a liability on KEMET’s balance sheet prior to KEMET’s acquisition of the remaining 66% economic interest in TOKIN. The Put Option was canceled, pursuant to the terms of the TOKIN Purchase Agreement with no exchange of consideration between NEC and KEMET. Accordingly, the fair value of the Put Option reduced the amount of consideration paid to acquire NEC’s equity in TOKIN. In accordance with ASC 805, KEMET’s previously held 34% equity interest in TOKIN and the assets acquired and the liabilities assumed were measured at their fair values based on various estimates. The acquisition-date fair value of KEMET’s previously held 34% equity interest in TOKIN was approximately $204.1 million , which was derived from 34% of the fair value of TOKIN as of April 19, 2017 determined under the discounted cash flow method, an income valuation approach. The following table presents the allocations of the aggregate purchase price based on the estimated fair values of the assets and liabilities (amounts in thousands): Fair Value Cash $ 315,743 Accounts Receivable 79,295 Inventory 35,310 Other current assets 20,902 Property, Plant and equipment 154,744 Intangible assets (1) 32,996 Equity method investments 11,128 Other assets 6,512 Current portion of long-term debt (3,225 ) Accounts payable (81,642 ) Accrued expenses (44,542 ) Other non-current obligations (105,140 ) Deferred income taxes (5,452 ) Total net assets acquired $ 416,629 ________________________________________________ (1) Includes trade name for $8.0 million and products and relationships of $25.0 million . TOKIN’s technology, products, and relationships were valued as a grouped, composite intangible asset due to the Company’s products being dependent on the existing technology, which enabled a product portfolio that customers found appealing in selecting and designing electronic devices for purchase. The trade name was valued based on the relief from royalty method and has an indefinite remaining useful life. The products and relationships were valued on the excess earnings method and are amortized over 10 years . There were $0.9 million of acquisition-related costs, which were all recognized as an expense in the line item “Selling, general and administrative expenses” on the Consolidated Statements of Operations for the fiscal year ended March 31, 2018. For the fiscal years ending March 31, 2019 and 2018, the Company's Consolidated Statements of Operations include net sales of $370.2 million and $358.2 million , respectively, and operating income of $34.8 million and $36.1 million , respectively, derived from TOKIN Corporation. The following table reflects the bargain purchase gain resulting from the TOKIN Acquisition (amounts in thousands): Net consideration transferred $ 150,358 Fair value of KEMET ’ s previously held equity interest in TOKIN (1) 204,112 Less: fair value of net assets acquired (416,629 ) Bargain purchase gain $ (62,159 ) ______________________________________ (1) Value based in the 34% of the enterprise value determined under the discounted cash flow method. In performing acquisition accounting procedures, we engaged an internationally recognized independent valuation firm to assist in the valuation of identifiable net assets acquired. We also performed an extensive review for any unrecorded assets, liabilities, and contingencies. After identifying and valuing acquired assets and liabilities, we concluded recording a bargain purchase gain was appropriate and required under ASC 805-30-25-2. We believe the bargain purchase gain resulted from (1) NEC seeking repayment of its receivables due from TOKIN pursuant to TOKIN’s January 25, 2013 Loan Agreement with NEC of JPY 25.4 billion , or approximately $233.2 million (using the April 19, 2017 exchange rate of 109.007 Japanese Yen to 1.00 U.S. Dollar), which the sale transaction achieved, and for which TOKIN did not have the resources to pay prior to the transaction; and, (2) a predetermined purchase price which, other than certain customary working capital adjustments, was not subject to amendment irrespective of the amount of proceeds resulting from the sale of TOKIN’s EMD business, which was a precondition to our acquisition of TOKIN. The bargain purchase gain is recognized in the line item “Acquisition (gain) loss” in the Consolidated Statements of Operations. Pro Forma Results The following table summarizes, on a pro forma basis, the combined results of operations of the Company and TOKIN as though the acquisition and the Sale of EMD had occurred as of April 1, 2016. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the acquisition occurred as of April 1, 2016, or of future consolidated operating results (amounts in thousands, except per share data): Fiscal Years Ended March 31, 2018 (1) 2017 (2) Pro forma revenues (3) $ 1,217,655 $ 1,060,777 Pro forma net income from continuing operations available to common stockholders (3) 51,975 226,086 Pro forma earnings per common share - basic (3) 0.98 4.86 Pro forma earnings per common share - diluted (3) 0.89 4.08 Pro forma common shares - basic 52,798 46,552 Pro forma common shares - diluted 58,640 55,389 ___________________________________________ (1) The net income for the fiscal year ended March 31, 2018 excludes the following: 34% of the gain on sale of the EMD business of $75.2 million , the gain related to the fair value of KEMET’s previous 34% interest in TOKIN of $68.7 million , and the bargain gain on the acquisition of TOKIN of $62.2 million . (2) The net income for the fiscal year ended March 31, 2017 includes the following: 34% of the gain on sale of the EMD business of $123.4 million (which includes the release of a valuation allowance that was recorded in the fourth quarter of fiscal year 2017 and the use of the deferred tax asset which was recorded in the first quarter of fiscal year 2018), the gain related to the fair value of KEMET’s previous 34% interest in TOKIN of $66.7 million , and the bargain gain on the acquisition of TOKIN of $60.3 million . (3) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606.

Debt

Debt	12 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	Debt A summary of debt is as follows (amounts in thousands): March 31, 2019 2018 Term Loan Credit Agreement (1) $ — $ 318,782 TOKIN Term Loan Facility (2) 276,808 — Customer Advances (3) 11,270 — Other, net (4) 6,393 5,841 Total debt 294,471 324,623 Current maturities (28,430 ) (20,540 ) Total long-term debt $ 266,041 $ 304,083 ______________________________________________________________________________ (1) Amount shown is net of discount, bank issuance costs and other indirect issuance costs of $13.3 million as of March 31, 2018 . (2) Amount shown is net of discount, bank issuance costs and other indirect issuance costs of $8.7 million as of March 31, 2019 . (3) Amount shown is net of discount of $2.1 million as of March 31, 2019 . (4) Amounts shown are net of discounts of $0.6 million and $0.5 million as of March 31, 2019 and 2018 , respectively. The line item “Interest expense” on the Consolidated Statements of Operations for the fiscal years 2019 , 2018 and 2017 , respectively, is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Contractual interest expense $ 19,471 $ 30,323 $ 38,825 Capitalized interest (232 ) (141 ) (154 ) Amortization of debt issuance costs 334 511 1,390 Amortization of debt (premium) discount 1,481 1,843 (788 ) Imputed interest on acquisition related obligations 57 113 159 Interest expense on capital leases 128 233 323 Total interest expense $ 21,239 $ 32,882 $ 39,755 Term Loan Credit Agreement On November 7, 2018, the Company repaid the full outstanding balance under the Company's prior Term Loan Credit Agreement dated April 28, 2017 (“Term Loan Credit Agreement”) with Bank of America, N.A. The Company incurred a $15.9 million loss on the debt extinguishment and the loss is included in the line item “Other (income) expense, net” in the Consolidated Statements of Operations for the fiscal year ended March 31, 2019. Interest payable related to the Term Loan Credit Agreement included in the line item “Accrued expenses” on the Consolidated Balance Sheets was $0.2 million as of March 31, 2018 . TOKIN Term Loan Facility On October 29, 2018, the Company entered into a JPY 33.0 billion Term Loan Agreement (the “TOKIN Term Loan Facility”) by and among TOKIN, the lenders party thereto (the “Lenders”) and Sumitomo Mitsui Trust Bank, Limited in its capacity as agent (the “Agent”), arranger and Lender. Funding for the Term Loan facility occurred on November 7, 2018. The proceeds, which were net of an arrangement fee withheld from the funding amount, were JPY 32.1 billion , or approximately $283.9 million using the exchange rate as of November 7, 2018. Net of the arrangement fee, bank issuance costs, and other indirect issuance costs, the Company's net proceeds from the TOKIN Term Loan Facility was $281.8 million . The proceeds from the TOKIN Term Loan Facility were used by TOKIN to make intercompany loans (the “Intercompany Loans”) to the Company. The proceeds, along with other cash on hand, were used to prepay in full the outstanding amounts under the Term Loan Credit Agreement of $323.4 million and a prepayment premium of 1.0% , or $3.2 million . The TOKIN Term Loan Facility consists of (i) a JPY 16.5 billion (approximately $146.0 million using the exchange rate as of November 7, 2018) Term Loan A tranche (the “Term Loan A”) and (ii) a JPY 16.5 billion (approximately $146.0 million using the exchange rate as of November 7, 2018) Term Loan B tranche (the “Term Loan B” and, together with the Term Loan A, collectively, the “Term Loans”). Principal payments under Term Loan A are required semi-annually, in the amount of JPY 1.4 billion (approximately $12.4 million using the exchange rate as of March 31, 2019 ), while the principal of Term Loan B is due in one payment at maturity. At each reporting period, the carrying value of the loan is translated from Japanese Yen to U.S. Dollars using the spot exchange rate as of the end of the reporting period. Interest payments are due semi-annually on the Term Loans, with the interest rate based on a margin over the six-month Japanese TIBOR. The applicable margin for Term Loan A is 2.00% and for Term Loan B is 2.25% . Japanese TIBOR at March 31, 2019 was 0.13% . Interest payable related to the TOKIN Term Loan Facility included in the line item “Accrued expenses” on the Consolidated Balance Sheets was $0.1 million as of March 31, 2019 . The effective interest rate for the TOKIN Term Loan Facility was 3.1% for the year ended March 31, 2019 . The Term Loans mature on September 30, 2024. KEMET and certain subsidiaries of TOKIN provided guarantees of the obligations under the Term Loans, which will also be secured by certain assets, properties and equity interests of TOKIN and its material subsidiaries. As of March 31, 2019 , properties and equipment with a net book value of $50.6 million were securing the Term Loans. The Term Loans contain customary covenants applicable to both the Company and to TOKIN, including maintenance of a consolidated net leverage ratio, the absence of two consecutive years of consolidated operating losses and the maintenance of certain required levels of consolidated net assets. The TOKIN Term Loan Facility also contains customary events of default. The Company may prepay the Term Loans at any time, subject to certain notice requirements and reimbursement of loan breakage costs. Customer Advances In September, November, and February of fiscal year 2019, the Company entered into agreements with three different customers (the “Customers”) pursuant to which the Customers agreed to make advances (collectively, the “Advances”) to the Company in an aggregate amount of up to $72.0 million (collectively, the “Customer Capacity Agreements”). The Company is using these Advances to fund the purchase of production equipment and to make other investments and improvements in its business and operations (the “Investments”) to increase overall capacity to produce various electronic components of the type and part as may be sold by the Company to the Customers from time to time. The Company retains all rights to the production equipment purchased with the funds from the Advances. The Advances from the Customers are being made in quarterly installments (“Installments”) over an expected period of 18 to 24 months from the effective date of the Customer Capacity Agreements. The Advances will be repaid beginning on the date that production from the Investments is sufficient to meet the Company's obligations under the agreements with the Customers. Repayments will be made on a quarterly basis as determined by calculations that generally consider the number of components purchased by the Customers during the quarter. Repayments based on the calculations will continue until either the Advances are repaid in full, or December 31, 2038 for all three Customers. The Company has a quarterly repayment cap in the agreement with each of the Customers and is not required to make any quarterly repayments to the Customers that in the aggregate exceeds $1.8 million . If the Customers do not purchase a number of components that would require full repayment of the Advances by December 31, 2038, then the Advances shall be deemed repaid in full. Additionally, if the Customers do not purchase a number of components that would require a payment on the Advances for a period of 16 consecutive quarters, the Advances shall be deemed repaid in full. As of March 31, 2019 , the Company has received a total of $13.4 million in Advances from these Customers. Since the debt is non-interest bearing , the Company has recorded debt discounts on the Advances. T hese discounts are being amortized over the expected life of the Advances through interest expense. During fiscal year 2019, the Company had $16.3 million in capital expenditures related to the Customer Capacity Agreements. As of March 31, 2019 , the Company had no cash on its Consolidated Balance Sheets that was restricted as far as its use related to the Customer Capacity Agreements. Restricted cash is recorded within “Prepaid expenses and other current assets” in the Consolidated Balance Sheets. Revolving Line of Credit On September 30, 2010, KEC and KEMET Electronic Marketing Services, Singapore (“KEMS”) entered into a Loan and Security Agreement (the “Revolver Agreement”), with Bank of America, N.A, as the administrative agent and the initial lender. The Revolver Agreement provided a $50.0 million revolving line of credit (the “Revolver”), which was bifurcated into a U.S. facility and a Singapore facility. A portion of the U.S. facility and the Singapore facility can be used to issue letters of credit. On December 19, 2014, the Revolver Agreement was amended, which increased the facility to $60.0 million , bifurcated into a U.S. facility and a Singapore facility. The amendment contained an accordion feature permitting the U.S. Borrowers to increase commitments under the facility by an aggregate principal amount up to $15.0 million (for a total facility of $75.0 million ), subject to terms and documentation acceptable to the Agent and/or the Lenders. In addition, KEMET Foil Manufacturing, LLC (“KFM”), KBP, and The Forest Electric Company were included as Borrowers under the U.S. facility. On April 28, 2017, the Revolver Agreement was amended to increase the facility to $75.0 million , provided KEC with lower applicable interest rate margins, and extended the expiration date to April 28, 2022 . In connection with the closing of the TOKIN Term Loan Facility on October 29, 2018, the Company entered into Amendment No. 10 to the Loan and Security Agreement, Waiver and Consent (the “Revolver Amendment”), by and among KEMET, KEC, the other borrowers named therein, the financial institutions party thereto as lenders and Bank of America, N.A., a national banking association, as agent for the lenders. The Revolver Amendment provides the Company with, among other things, increased flexibility for certain restricted payments (including dividends), and released certain pledges that allowed the Company to obtain the TOKIN Term Loan Facility to pay down the Term Loan Credit Agreement. The principal features of the Revolver Agreement as amended are reflected in the description below. The size of the U.S. facility and Singapore facility can fluctuate as long as the Singapore facility does not exceed $30.0 million and the total facility does not exceed $60.0 million . Borrowings under the U.S. and Singapore facilities are subject to a borrowing base consisting of: • In the case of the U.S. facility, (A) 85% of KEC’s accounts receivable that satisfy certain eligibility criteria plus (B) the lesser of (i) $6.0 million and (ii) (a) on or prior to agent’s receipt of an updated inventory appraisal and agent’s approval thereof, 40% of the value of Eligible Inventory (as defined in the agreement) and (b) upon agent’s receipt of an updated inventory appraisal, 85% of the net orderly liquidation value of the Eligible Inventory (as defined in the agreement) plus (C) the lesser of $5.1 million and 80% of the net orderly liquidation percentage of the appraised value of equipment that satisfies certain eligibility criteria, as reduced on the first day of each fiscal quarter occurring after April 30, 2014 in an amount equal to one-twentieth (1/20) of such appraised value less (D) certain reserves, including certain reserves imposed by the administrative agent in its permitted discretion; and • In the case of the Singapore facility, (A) 85% of KEMET Singapore’s accounts receivable that satisfy certain eligibility criteria as further specified in the Revolver Agreement less (B) certain reserves, including certain reserves imposed by the administrative agent in its permitted discretion. Interest is payable on borrowings monthly at a rate equal to the London Interbank Offer Rate (“LIBOR”) or the base rate, plus an applicable margin, as selected by the Borrower. Depending upon the fixed charge coverage ratio of KEMET Corporation and its subsidiaries on a consolidated basis as of the latest test date, the applicable margin under the U.S. facility varies between 2.00% and 2.50% for LIBOR advances and 1.00% and 1.50% for base rate advances, and under the Singapore facility varies between 2.25% and 2.75% for LIBOR advances and 1.25% and 1.75% for base rate advances. The base rate is subject to a floor that is 100 basis points above LIBOR. An unused line fee is payable monthly in an amount equal to a per annum rate equal to (a) 0.50% , if the average daily balance of revolver loans and stated amount of letters of credit was 50% or less of the revolver commitments during the preceding calendar month, or (b) 0.375% , if the average daily balance of revolver loans and stated amount of letters of credit was more than 50% of the Revolver commitment during the preceding calendar month. A customary fee is also payable to the administrative agent on a quarterly basis. KEC’s ability to draw funds under the U.S. facility and KEMET Singapore’s ability to draw funds under the Singapore facility are conditioned upon, among other matters: • the absence of the existence of a Material Adverse Effect (as defined in the Revolver Agreement); • the absence of the existence of a default or an event of default under the Revolver Agreement; and • the representations and warranties made by KEC and KEMS in the Revolver Agreement continuing to be correct in all material respects. KEMET and KEC’s 100% owned domestic subsidiaries (“Guarantor Subsidiaries”) guarantee the U.S. facility obligations and the U.S. facility obligations are secured by a lien on substantially all of the assets of KEC and the Guarantor Subsidiaries (other than assets that secure the 10.5% Senior Notes due 2018). The collection accounts of the Borrowers and Guarantor Subsidiaries are subject to a daily sweep into a concentration account and the concentration account will become subject to full cash dominion in favor of the administrative agent (i) upon an event of default, (ii) if for five consecutive business days, aggregate availability of all facilities has been less than the greater of (A) 10% of the aggregate revolver commitments at such time and (B) $7.5 million , or (iii) if for five consecutive business days, availability of the U.S. facility has been less than $3.75 million (each such event, a “Cash Dominion Trigger Event”). KEC and the Guarantor Subsidiaries guarantee the Singapore facility obligations. In addition to the assets that secure the U.S. facility, the Singapore obligations are also secured by a pledge of 100% of the stock of KEMET Singapore and a security interest in substantially all of KEM's assets. KEMET Singapore’s bank accounts are maintained at Bank of America and upon a Cash Dominion Trigger Event will become subject to full cash dominion in favor of the administrative agent. A fixed charge coverage ratio of at least 1.0 :1.0 must be maintained as of the last day of each fiscal quarter ending immediately prior to or during any period in which any of the following occurs and is continuing until none of the following occurs for a period of at least forty-five consecutive days: (i) an event of default, (ii) aggregate availability of all facilities has been less than the greater of (A) 10% of the aggregate revolver commitments at such time and (B) $7.5 million , or (iii) availability of the U.S. facility has been less than $3.75 million . The fixed charge coverage ratio tests the EBITDA and fixed charges of KEMET and its subsidiaries on a consolidated basis. In addition, the Revolver Agreement, as amended, includes various covenants that, subject to exceptions, limit the ability of KEMET and its direct and indirect subsidiaries to, among other things: incur additional indebtedness; create liens on assets; engage in mergers, consolidations, liquidations and dissolutions; sell assets (including pursuant to sale leaseback transactions); pay dividends and distributions on or repurchase capital stock; make investments (including acquisitions), loans, or advances; prepay certain junior indebtedness; engage in certain transactions with affiliates; enter into restrictive agreements; amend material agreements governing certain junior indebtedness; and change its lines of business. The Revolver Agreement includes certain customary representations and warranties, affirmative covenants and events of default. Debt issuance costs related to the Revolver Agreement, net of amortization, were $0.1 million and $0.1 million as of March 31, 2019 and 2018 , respectively. These costs are included in the line item “Other assets” in the Consolidated Balance Sheets and are amortized over the term of the Revolver Agreement. The Company’s available borrowing capacity under the Loan and Security Agreement was $66.0 million as of March 31, 2019 . Other Debt In January 2017, KEMET Electronics Portugal, S.A., (“KEP”) a wholly owned subsidiary, entered into a program with the Portuguese government where KEP is eligible to receive interest free loans from the Portuguese government if KEP purchases fixed assets for certain projects approved by the Portuguese government. In January 2017, KEP received the first part of an interest free loan in the amount of EUR 2.2 million (or $2.5 million ). In July 2017, KEP received the second part of the loan in the amount of EUR 0.3 million (or $0.3 million ). The loan has a maturity date of February 1, 2025. The loan will be repaid through semi-annual payments on August 1 and February 1 of each year beginning on August 1, 2019. The repayments will be in the amount of EUR 0.2 million (or $0.2 million ). In February 2019, KEP received a second interest free loan from the Portuguese government in the amount of EUR 0.9 million (or $1.1 million ). The loan has a maturity date of September 1, 2026 and will be repaid through semi-annual payments on March 1 and September 1 of each year beginning on March 1, 2021. The repayments will be in the amount of EUR 0.1 million (or $0.1 million ). Since the KEP debt is non-interest bearing, we have recorded debt discounts on the loans. These discounts are being amortized over the life of the loans through interest expense. If certain conditions are met by KEP, such as increased headcount at its facility in Evora, Portugal, increased revenue, and increased gross value added, a portion of these loans could be forgiven. TOKIN has a short term borrowing pursuant to an agreement with The 77 Bank Limited, located in Japan, in the amount of 350 million yen (or $3.2 million ), at an interest rate of 0.53% (Japanese TIBOR + 40 basis points). The loan was originally due in September 2018 and was extended to September 2019. The loan agreement automatically renews if both parties choose not to terminate or modify it. The following table highlights the Company’s annual cash maturities of debt (amounts in thousands): Annual Maturities of Debt Fiscal Years Ended March 31, 2020 2021 2022 2023 2024 Thereafter TOKIN Term Loan Facility $ 24,826 $ 24,826 $ 24,826 $ 24,826 $ 24,826 $ 161,371 Customer Advances (1) — 1,800 6,850 4,028 734 — Other 3,604 560 647 647 647 909 $ 28,430 $ 27,186 $ 32,323 $ 29,501 $ 26,207 $ 162,280 (1) Repayment of the Customer Capacity Agreements assumes the customers purchase products in a quantity sufficient to require the maximum permitted debt repayment amount per quarter.

Restructuring

Restructuring	12 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring	Restructuring The Company has implemented restructuring plans which include programs to increase competitiveness by removing excess capacity, relocating production to lower cost locations, relocating corporate functions to the new headquarters, and eliminating unnecessary costs throughout the Company. Significant restructuring plans which include personnel reduction costs that occurred during fiscal year ended March 31, 2019 are summarized below: • Within the TOKIN legacy group, KEMET took a reduction in force across various operational and overhead functions. The reduction in force was substantially complete as of March 31, 2019. • The Solid Capacitors reportable segment is streamlining its vertical integration strategy by relocating its tantalum powder facility equipment from Carson City, Nevada to its existing Matamoros, Mexico plant. Severance charges and equipment relocation costs. The relocation is expected to be completed by December 31, 2019. The Solid Capacitors reportable segment is also reorganizing due to a decline of MnO2 products. The efforts are expected to be completed by June 30, 2019. • The Film and Electrolytic reportable segment is streamlining its manufacturing operations by relocating axial electrolytic production from its plant in Granna, Sweden and to its existing Evora, Portugal plant to consolidate axial electrolytic production in an effort to further improve gross margins, net income, and cash flow. The relocation is expected to be completed by June 30, 2019. Significant restructuring plans in progress or recently completed as of March 31, 2019 are summarized in the table below (amounts in thousands): Total expected to be incurred Incurred during year ended March 31, 2019 (4) Cumulative incurred to date Restructuring Plan Segment Personnel Reduction Costs Relocation & Exit Costs Personnel Reduction Costs Relocation & Exit Costs Personnel Reduction Costs Relocation & Exit Costs TOKIN operational & overhead function reduction in force MSA, Corporate, & Solid Capacitors (1) 5,339 — 942 — 5,339 — Tantalum powder facility relocation (2) (3) Solid Capacitors 850 2,468 — 3,355 — 3,355 Axial electrolytic production relocation from Granna to Evora Film and Electrolytic 879 3,232 — 2,296 — 2,296 Reorganization due to decline of MnO2 Products Solid Capacitors 1,798 — 1,585 — 1,585 — ___________________________________________ (1) Cumulative personnel reduction costs incurred to date are comprised of $3.8 million , $1.4 million , and $0.1 million within the MSA, Corporate, and Solid Capacitor reportable segments, respectively. (2) $0.9 million in tantalum reclaim is expected to be recovered as part of this restructuring activity, which will reduce total costs in subsequent periods. (3) The Company expects to recover approximately $0.9 million related to tantalum reclaim, which would decrease the cumulative expenses incurred to date for relocation and exit costs upon the completion of reclaim activities. (4) The Company incurred $0.6 million in restructuring charges for minor projects not included in the table above during fiscal year ended March 31, 2019 , consisting of $0.3 million each in personal reduction costs and relocation and exit costs. A summary of the expenses aggregated on the Consolidated Statements of Operations line item “Restructuring charges” in the fiscal years ended March 31, 2019 , 2018 and 2017 , is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Personnel reduction costs $ 2,823 $ 12,587 $ 2,214 Relocation and exit costs 5,956 2,256 3,190 Restructuring charges $ 8,779 $ 14,843 $ 5,404 Fiscal Year Ended March 31, 2019 The Company incurred $8.8 million in restructuring charges in the fiscal year ended March 31, 2019 , including $2.8 million in personnel reduction costs and $6.0 million in relocation and exit costs. The personnel reduction costs of $2.8 million were primarily due to $0.9 million in costs related to headcount reductions in the TOKIN legacy group across various internal and operational functions, $0.3 million in severance charges related to personnel reductions in the Film and Electrolytic reportable segment resulting from a reorganization of the segment's management structure, and $1.6 million in costs related to reorganization in the Solid Capacitors reportable segment due to a permanent structural change driven by a decline of MnO2 products. The relocation and exit costs of $6.0 million were primarily due to $3.4 million in costs related to the Company's relocation of its tantalum powder equipment from Carson City, Nevada to its plant in Matamoros, Mexico and $2.3 million in costs related to the relocation of axial electrolytic production equipment from Granna, Sweden to its plant in Evora, Portugal. Fiscal Year Ended March 31, 2018 The Company incurred $14.8 million in restructuring charges in the fiscal year ended March 31, 2018 , including $12.6 million related to personnel reduction costs and $2.3 million of relocation and exit costs. The personnel reduction costs of $12.6 million were due to $5.2 million related to a voluntary reduction in force in the Film and Electrolytic reportable segment's Italian operations; $4.4 million related to a headcount reduction in the TOKIN legacy group across various internal and operational functions; $2.7 million in severance charges across various overhead functions in the Simpsonville, South Carolina office as these functions were relocated to the Company's new corporate headquarters in Fort Lauderdale, Florida; and $0.2 million in headcount reductions related to a European sales reorganization. The relocation and exit costs of $2.3 million included $0.9 million in lease termination penalties related to the relocation of global marketing, finance and accounting, and information technology functions to the Company's Fort Lauderdale office, $0.8 million in expenses related to the relocation of the K-Salt operations to the existing Matamoros, Mexico plant, $0.4 million in exit costs related to the shut-down of operations for KFM, and $0.1 million related to the transfer of certain Tantalum production from Simpsonville, South Carolina to Victoria, Mexico. Fiscal Year Ended March 31, 2017 The Company incurred $5.4 million in restructuring charges in the fiscal year ended March 31, 2017 , including $2.2 million related to personnel reduction costs and $3.2 million of relocation and exit costs. The personnel reduction costs of $2.2 million corresponded with the following: $0.3 million related to the consolidation of certain Solid Capacitor manufacturing in Matamoros, Mexico; $0.4 million for headcount reductions related to the shut-down of operations for KFM; $0.3 million related to headcount reductions in Europe (primarily Italy and Landsberg, Germany) corresponding with the relocation of certain production lines and laboratories to lower cost regions; $0.3 million for overhead reductions in Sweden; $0.3 million in U.S. headcount reductions related to the relocation of global marketing functions to the Company’s Fort Lauderdale, Florida office; $0.3 million in headcount reductions related to the transfer of certain Tantalum production from Simpsonville, South Carolina to Victoria, Mexico; $0.2 million in overhead reductions for the relocation of research and development operations from Weymouth, England to Evora, Portugal; and $0.1 million in manufacturing headcount reductions related to the relocation of the K-Salt operations to the existing Matamoros, Mexico plant. The relocation and exit costs of $3.2 million included $1.9 million in expenses related to contract termination costs related to the shut-down of operations for KFM; $0.6 million in expenses related to the relocation of the K-Salt operations to the existing Matamoros, Mexico plant; $0.6 million for transfers of Film and Electrolytic production lines and R&D functions to lower cost regions; and $0.1 million related to the transfer of certain Tantalum production from Simpsonville, South Carolina to Victoria, Mexico. A reconciliation of the beginning and ending liability balances for restructuring charges included in the line items “Accrued expenses” and “Other non-current obligations” on the Consolidated Balance Sheets were as follows (amounts in thousands): Personnel Reductions Relocation and Exit Costs Balance at March 31, 2016 $ 976 $ — Costs charged to expense 2,214 3,190 Costs paid or settled (2,130 ) (2,784 ) Change in foreign exchange (61 ) — Balance at March 31, 2017 999 406 TOKIN opening balance — 312 Costs charged to expense (1) 12,384 2,256 Costs paid or settled (3,901 ) (2,662 ) Change in foreign exchange 147 18 Balance at March 31, 2018 9,629 330 Costs charged to expense 2,823 5,956 Costs paid or settled (10,329 ) (5,957 ) Change in foreign exchange (258 ) (13 ) Balance at March 31, 2019 $ 1,865 $ 316 _________________________________________ (1) Personnel reduction costs charged to expense include $0.2 million of relocation costs expensed as incurred, and therefore not included in accrued expenses for the fiscal year ended March 31, 2018.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Goodwill and Intangible Assets The following table highlights the Company’s intangible assets (amounts in thousands): March 31, 2019 March 31, 2018 Carrying Amount Accumulated Amortization Net Amount Carrying Amount Accumulated Amortization Net Amount Indefinite Lived Intangible Assets: Trademarks $ 15,151 $ — $ 15,151 $ 15,474 $ — $ 15,474 Amortizing Intangibles: Patents (10 - 18 years) 26,662 (12,046 ) 14,616 26,662 (10,625 ) 16,037 Customer relationships (10 - 21 years 37,850 (13,868 ) 23,982 40,131 (11,735 ) 28,396 Other 214 (214 ) — 238 (238 ) — Total amortizing intangibles 64,726 (26,128 ) 38,598 67,031 (22,598 ) 44,433 Total intangible assets $ 79,877 $ (26,128 ) $ 53,749 $ 82,505 $ (22,598 ) $ 59,907 For fiscal years ended March 31, 2019 , 2018 , and 2017 , amortization related to intangibles was $4.5 million , $4.3 million and $2.1 million , respectively, consisting of amortization related to patents of $1.4 million , $1.4 million , and $1.5 million , respectively, and amortization related to customer relationships of $3.1 million , $2.9 million , and $0.6 million , respectively. The weighted-average useful life as of March 31, 2019 and 2018 for patents was 15.8 years and for customer relationships was 12.3 years . The weighted-average period prior to the next renewal for patents was 2.5 years and 3.5 years as of March 31, 2019 and 2018 , respectively. Estimated amortization of intangible assets for each of the next five fiscal years is $4.5 million , and thereafter, amortization will total $16.1 million . Estimated amortization of patents for each of the next five fiscal years is $1.4 million , and thereafter, amortization will total $7.5 million . Estimated amortization of customer relationships for each of the next five fiscal years is $3.1 million , and thereafter, amortization will total $8.6 million . For fiscal year 2019 , the Company completed its impairment test on goodwill and intangible assets with indefinite useful lives as of January 1, 2019 and concluded that goodwill and indefinite-lived assets were not impaired. The were no changes to the carrying amount of goodwill for the years ended March 31, 2019 and 2018 . As of March 31, 2019 , and 2018 , the carrying amount of goodwill was $40.3 million .

Equity Method Investments

Equity Method Investments	12 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Equity Method Investments	Equity Method Investments The following table provides a reconciliation of equity method investments to the Company's Consolidated Balance Sheets (amounts in thousands): March 31, 2019 2018 Nippon Yttrium Co., Ltd ("NYC") $ 8,215 $ 8,148 NT Sales Co., Ltd ("NTS") 1,218 998 Novasentis 977 2,870 KEMET Jianghai Electronics Components Co., Ltd (“KEMET Jianghai”) 2,515 — $ 12,925 $ 12,016 TOKIN's Joint Ventures - NYC and NTS As noted in Note 2 , “ Acquisitions ,” on April 19, 2017, the Company completed its acquisition of the remaining 66% economic interest in TOKIN and TOKIN became a 100% owned subsidiary of KEMET. TOKIN had two investments at the time of acquisition: NYC and NTS. The Company accounts for both investments using the equity method due to the related nature of operations and the Company's ability to influence management decisions. NYC was established in 1966 by TOKIN and Mitsui Mining and Smelting Co., Ltd (“Mitsui”). NYC was established to commercialize yttrium oxides and the Company owns 30% of NYC's stock. The carrying amount of the Company's equity investment in NYC was $8.2 million and $8.1 million as of March 31, 2019 and 2018 , respectively. NTS was established in 2004 by TOKIN, however subsequent to its formation, TOKIN sold 67% of its stock. NTS provides world-class electronic devices by utilizing global procurement networks and the Company owns 33% of NTS' stock. During the year ended March 31, 2019 , a significant portion of NTS' sales were TOKIN’s products. The carrying amount of the Company's equity investment in NTS was $1.2 million and $1.0 million as of March 31, 2019 and 2018 , respectively. Summarized transactions between TOKIN and NTS are as follows (amounts in thousands): Fiscal Year Ended March 31, 2019 2018 KEMET's sales to NTS $ 49,740 $ 52,883 NTS' sales to KEMET 2,501 1,616 Investment in Novasentis During fiscal year 2018, KEMET invested in the Series-D round of funding of Novasentis, a leading developer of film-based haptic actuators. Novasentis produces the world’s thinnest electro mechanical polymer-based actuators that provide rich haptic feedback for a variety of applications, including augmented/virtual reality and wearables. Novasentis supplies its “smart” film and KEMET applies its expertise in manufacturing film capacitors to the development and commercial production of the actuators. The Company's ownership percentage in Novasentis is 27.9% and has 1 of 3 seats on Novasentis’ board of directors. Additionally, KEMET has an exclusive manufacturing supply agreement, whereby Novasentis (the “Buyer”) will purchase goods exclusively from KEMET (the “Seller”) and the Seller shall manufacture and sell goods exclusively to the Buyer. While the Company determined that Novasentis is a variable interest entity, the Company concluded that it is not the primary beneficiary of Novasentis. Accordingly, the Company accounts for its investment in Novasentis under the equity method of accounting. Under the equity method, the Company's share of profits and losses and impairment charges on investments in affiliates are included in “Equity income (loss) from equity method investments” in the Consolidated Statements of Operations. During the fourth quarter of fiscal year 2019, the Company recorded $2.7 million of impairment on its investment in Novasentis. The carrying amount of the Company's equity investment in Novasentis was $1.0 million and $2.9 million as of March 31, 2019 and 2018 , respectively. KEMET JIANGHAI Joint Venture On January 29, 2018, KEC entered into a joint venture agreement (the “Agreement”) with Jianghai (Nantong) Film Capacitor Co., Ltd (“Jianghai Film”), a subsidiary of Nantong Jianghai Capacitor Co., Ltd (“Jianghai”) for the formation of KEMET Jianghai Electronic Components Co. Ltd., a limited liability company located in Nantong, China. KEMET Jianghai was officially formed on May 16, 2018 to manufacture axial electrolytic capacitors and (H)EV Film DC brick capacitors, for distribution through the KEMET and Jianghai Film sales channels. During fiscal year 2019 the Company signed an amendment to the Agreement with Jianghai Film to expand the scope of KEMET Jianghai to also produce solid aluminum capacitors and aluminum electrolytic capacitors. The Company's ownership percentage is 50.0% and the Company and Jianghai Film are equally represented on the joint venture’s board of directors. The Company's initial capital contribution to KEMET Jianghai was made during the second quarter of fiscal year 2019, and the Company accounts for its investment using the equity method due to the related nature of operations and its ability to influence the joint venture's decisions. As of March 31, 2019 , the carrying amount of the Company's equity investment in KEMET Jianghai was $2.5 million . Investment in TOKIN As noted in Note 2 , “ Acquisitions, ” the Company held a 34% economic interest in TOKIN from February 1, 2013 through April 19, 2017. The Company completed its acquisition of the remaining 66% economic interest in TOKIN on April 19, 2017. During the time period that the Company held its 34% economic interest in TOKIN, the Company accounted for its investment using the equity method for a non-consolidated variable interest entity since KEMET did not have the power to direct significant activities of TOKIN. Prior to the acquisition, the Company had a put option that could have required KEMET to purchase all of the outstanding capital stock of TOKIN from its shareholders (the “Put Option”). The Put Option was canceled as part of the TOKIN acquisition and accounted for as a reduction in the purchase price of TOKIN. In fiscal years prior to the TOKIN acquisition, the Put Option was marked to fair value as of the end of each reporting period with the change in fair value included in the line item “Change in the value of TOKIN options” in the Consolidated Statements of Operations. For the fiscal year ended March 31, 2017, the Company recognized a $10.7 million gain related to the change in the fair value of the Put Option. Summarized financial information for TOKIN for fiscal years 2018 and 2017 are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 Net sales $ 23,649 $ 328,822 Gross profit 6,647 74,465 Net income 247,786 128,502 A reconciliation between TOKIN’s net income and KEMET’s equity investment income for fiscal years 2018 and 2017 are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 TOKIN net income $ 247,786 $ 128,502 KEMET’s equity ownership % 34 % 34 % Equity income from TOKIN before Adjustments $ 84,247 $ 43,691 Adjustments: Amortization and depreciation (113 ) (2,210 ) Removal of EMD memo accounts (8,981 ) — Inventory profit elimination 24 162 Equity income from TOKIN 75,177 41,643 Acquired equity method investment income 1,015 — Equity income from equity method investments $ 76,192 $ 41,643 Summarized transactions between KEC and TOKIN are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 KEC’s sales to TOKIN $ 727 $ 17,100 TOKIN’s sales to KEMET 356 8,341

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information The Company is organized into three reportable segments: Solid Capacitors, Film and Electrolytic, and MSA based primarily on product lines. The reportable segments are responsible for their respective manufacturing sites as well as their research and development efforts. The Company does not allocate corporate indirect selling, general and administrative (“SG&A”) or shared R&D expenses to the segments. Solid Capacitors Solid Capacitors operates in ten manufacturing sites in the United States, Mexico and Asia, and operates innovation centers in the United States and Japan. Solid Capacitors primarily produces tantalum, aluminum, polymer and ceramic capacitors which are sold globally. Solid Capacitors also produces tantalum powder used in the production of tantalum capacitors. Film and Electrolytic Film and Electrolytic operates in nine manufacturing sites throughout Europe and Asia, and maintain product innovation centers in Italy, Portugal, and Sweden. Film and Electrolytic primarily produces film, paper, and wet aluminum electrolytic capacitors, which are sold globally. In addition, the Film and Electrolytic reportable segment designs and produces electromagnetic interference filters. MSA MSA operates in four manufacturing sites throughout Asia and operates a product innovation center in Japan. MSA primarily produces EMC materials and devices, piezo materials and actuators, and various types of sensors, which are sold globally. In the following tables, revenue is disaggregated by primary geographical market, sales channel, and major product lines. The tables also include reconciliations of the disaggregated revenue with the reportable segments for the fiscal years ended 2019 , 2018 and 2017 (amounts in thousands): Fiscal Year Ended March 31, 2019 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim ("APAC") $ 411,183 $ 51,923 $ 70,234 $ 533,340 Europe, the Middle East, and Africa ("EMEA") 189,992 122,956 2,587 315,535 North and South America ("Americas") 297,167 30,462 10,213 337,842 Japan and Korea ("JPKO") 37,496 899 157,706 196,101 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Sales channel OEM $ 290,058 $ 81,704 $ 226,544 $ 598,306 Distributor 475,190 100,113 9,315 584,618 EMS 170,590 24,423 4,881 199,894 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Major product lines Tantalum $ 563,255 $ — $ — $ 563,255 Ceramics 372,583 — — 372,583 Film and Electrolytic — 206,240 — 206,240 MSA — — 240,740 240,740 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Fiscal Year Ended March 31, 2018 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim $ 350,791 $ 58,922 $ 70,274 $ 479,987 Europe, the Middle East, and Africa 156,169 119,649 2,080 277,898 North and South America 227,582 22,634 8,889 259,105 Japan and Korea 36,698 772 145,721 183,191 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Sales channel OEM $ 262,097 $ 86,049 $ 215,349 $ 563,495 Distributor 366,569 92,708 11,047 470,324 EMS 142,574 23,220 568 166,362 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Major product lines Tantalum $ 495,114 $ — $ — $ 495,114 Ceramics 276,126 — — 276,126 Film and Electrolytic — 201,977 — 201,977 MSA — — 226,964 226,964 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Fiscal Year Ended March 31, 2017 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim $ 237,847 $ 50,917 $ — $ 288,764 Europe, the Middle East, and Africa 128,617 108,820 — 237,437 North and South America 202,812 21,244 — 224,056 Japan and Korea 5,834 1,247 — 7,081 $ 575,110 $ 182,228 $ — $ 757,338 Sales channel OEM $ 162,411 $ 83,986 $ — $ 246,397 Distributor 275,591 79,048 — 354,639 EMS 137,108 19,194 — 156,302 $ 575,110 $ 182,228 $ — $ 757,338 Major product lines Tantalum $ 342,184 $ 342,184 Ceramics 232,926 232,926 Film and Electrolytic 182,228 — 182,228 MSA — — — — $ 575,110 $ 182,228 $ — $ 757,338 The following highlights net sales by geographic location (amounts in thousands): Fiscal Years Ended March 31, (1) 2019 2018 2017 United States $ 292,980 $ 233,133 $ 198,250 Hong Kong 188,102 169,073 121,813 Germany 124,805 105,548 104,755 Europe (2) (3) 76,149 64,248 63,863 China 173,148 163,016 71,223 Taiwan 88,853 78,728 9,147 Asia Pacific (2) 47,233 36,647 26,878 Japan 178,502 170,282 3,565 United Kingdom 42,472 37,038 33,837 Netherlands 44,065 39,684 32,478 Malaysia 33,748 28,165 15,177 Singapore 19,417 17,267 15,565 Italy 15,551 17,905 15,376 Hungary 12,245 13,254 18,856 Mexico 44,267 23,915 22,424 Other Countries (2) 1,281 2,278 4,131 Total Non-United States (3) 1,089,838 967,048 559,088 $ 1,382,818 $ 1,200,181 $ 757,338 ______________________________________________________________________________ (1) Revenues are attributed to countries or regions based on the location of the customer. Net Sales to one customer, TTI, Inc., exceeded 10% of total net sales as follows: $184.3 million , $133.5 million and $104.4 million in fiscal years 2019 , 2018 and 2017 , respectively. (2) No country included in this caption exceeded 3% of consolidated net sales for fiscal years 2019 , 2018 and 2017 . (3) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. The following tables summarize information for operating income (loss), depreciation and amortization, restructuring charges, gain (loss) on write down and disposal of long-lived assets, and capital expenditures by reportable segment for the fiscal years ended 2019 , 2018 and 2017 and total assets by reportable segment for the fiscal years ended 2019 and 2018 (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Operating income (loss): (1) Solid Capacitors $ 348,150 $ 234,473 $ 147,662 Film and Electrolytic (1) 8,183 3,622 (9,028 ) MSA 22,546 15,694 — Corporate (178,030 ) (140,937 ) (103,666 ) $ 200,849 $ 112,852 $ 34,968 Depreciation and amortization expense: (1) Solid Capacitors $ 28,795 $ 27,329 $ 20,824 Film and Electrolytic (1) 9,763 10,918 11,766 MSA 5,226 4,407 — Corporate 8,844 8,007 5,561 $ 52,628 $ 50,661 $ 38,151 Restructuring charges: Solid Capacitors $ 4,922 $ 983 $ 1,333 Film and Electrolytic 2,717 5,788 3,738 MSA 452 3,343 — Corporate 688 4,729 333 $ 8,779 $ 14,843 $ 5,404 (Gain) loss on write down and disposal of long-lived assets Solid Capacitors $ 235 $ 689 $ 2,303 Film and Electrolytic (93 ) (3,356 ) 8,339 MSA — 1,272 — Corporate 1,518 403 29 $ 1,660 $ (992 ) $ 10,671 Capital expenditures: Solid Capacitors $ 80,700 $ 31,249 $ 12,300 Film and Electrolytic 16,000 12,651 7,955 MSA 13,400 8,481 — Corporate 35,956 12,623 5,362 $ 146,056 $ 65,004 $ 25,617 _______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. March 31, 2019 2018 Total assets: Solid Capacitors $ 794,402 $ 704,851 Film and Electrolytic (1) 219,711 240,968 MSA 234,419 254,193 Corporate 69,563 22,911 $ 1,318,095 $ 1,222,923 _______________________________________________________________________________ (1) March 31, 2018 adjusted due to the adoption of ASC 606. The following geographic information includes Property, plant and equipment, net, based on physical location (amounts in thousands): March 31, 2019 2018 United States $ 57,095 $ 49,530 Japan 89,602 79,855 Thailand 82,389 74,100 Mexico 121,147 62,503 Italy 35,197 39,398 China 45,815 36,396 Portugal 31,872 29,073 Macedonia 12,906 13,723 Bulgaria 5,480 5,597 Sweden 4,800 6,005 Other (1) 8,977 9,136 Total Non-United States 438,185 355,786 $ 495,280 $ 405,316 _______________________________________________________________________________ (1) No country included in this caption exceeded 1% of consolidated Property, plant and equipment net for fiscal years 2019 and 2018 .

Discontinued Operations

Discontinued Operations	12 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	Discontinued Operations The Film and Electrolytic business group (“Film and Electrolytic”) completed the sale of its machinery division in April 2014, which resulted in a gain of $5.6 million on the sale of the business (after income tax expense) offset by a loss from machinery operations of $0.3 million during the fiscal year ended March 31, 2015 resulting in net income from discontinued operations of $5.4 million . Net sales and net operating loss from the Company’s discontinued operation for years ended March 31, 2019 , 2018 and 2017 were as follows (in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Net sales $ — $ — $ — Operating income (loss) — — —

Impairment Charges

Impairment Charges	12 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Impairment Charges	(Gain) Loss on Write Down and Disposal of Long-Lived Assets During fiscal year 2019 , KEMET recorded a net loss on the write down and disposal of long-lived assets of $1.7 million , which was comprised of $0.7 million in impairment charges and $1.0 million in net losses on the sale and disposal of long-lived assets. The impairment charges were primarily related to the write down of idle land and machinery of $0.5 million and $0.2 million , respectively, at TOKIN. The $1.0 million net loss on write down and disposal of long-lived assets primarily consisted of the disposal of furniture and fixtures resulting from the Company relocation of its corporate headquarters to Fort Lauderdale, Florida and the disposal of old machinery throughout the Company that was no longer being used. These activities are recorded on the Consolidated Statements of Operations line item "(Gain) loss on write down and disposal of long-lived assets." During fiscal year 2018 , the Company recorded a net gain on the write down and disposal of long-lived assets of $1.0 million , which was comprised of $1.2 million in net gains on the sale and disposal of long-lived assets offset by $0.2 million in impairment charges. The net gains on the sale and disposal of long-lived assets were primarily related to the sale of equipment, land, and buildings from KFM, which was shut down in fiscal year 2017. On March 13, 2018, the Company sold KFM's land and buildings to a third party for a gross sales price of $3.6 million . The net proceeds realized by the Company were approximately $3.4 million after payment of $0.2 million in closing costs. The Company realized a gain on the sale of the land and buildings of approximately $1.9 million during the year ended March 31, 2018 as a result of the sale. In addition, the Company sold KFM's equipment for a $1.4 million gain. These gains were partially offset by MSA's loss on disposals of assets of $1.3 million primarily related to equipment and buildings used for discontinued products and Solid Capacitors' loss of approximately $0.6 million related to the relocation of its K-Salt operations from a leased facility to its existing Matamoros, Mexico facility. During fiscal year 2017 , the Company recorded a net loss on write down and disposal of long-lived assets of $10.7 million , which was comprised of $10.3 million in impairment charges and $0.4 million in net losses on the sale and disposal of long-lived assets. In fiscal year 2017, Film and Electrolytic incurred impairment charges totaling $8.2 million . The impairment charges consisted of the following two actions. On August 31, 2016, KEMET Electronics Corporation, a wholly-owned subsidiary of KEMET made the decision to shut-down operations of its wholly-owned subsidiary, KFM. Operations at KFM’s Knoxville, Tennessee plant ceased as of October 31, 2016. The Company recorded impairment charges related to KFM totaling $4.1 million comprised of $3.0 million for the write down of property plant and equipment and $1.1 million for the write down of intangible assets. The Company also recorded impairment charges of $4.1 million related to a decline in real estate market conditions surrounding its vacated Sasso Marconi, Italy manufacturing facility. In fiscal year 2017, Solid Capacitors incurred impairment charges totaling $2.1 million related to the relocation of its leased K-salt facility to the existing Matamoros, Mexico facility.

Pension and Other Post-retireme

Pension and Other Post-retirement Benefit Plans	12 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Pension and Other Post-retirement Benefit Plans	Pension and Other Post-retirement Benefit Plans The Company sponsors twelve defined benefit pension plans: six in Europe, one in Singapore, two in Mexico, two in Japan, and one in Thailand. The Company funds the pension liabilities in accordance with laws and regulations applicable to those plans. In addition, the Company maintains two frozen post-retirement benefit plans: health care and life insurance benefits for certain retired United States employees who reached retirement age while working for the Company. The health care plan is contributory, with participants’ contributions adjusted annually. The life insurance plan is non-contributory. A summary of the changes in benefit obligations and plan assets at March 31, 2019 and 2018 is as follows (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Change in Benefit Obligation Benefit obligation at beginning of the year $ 161,673 $ 45,171 $ 367 $ 386 Service cost 4,716 4,585 — — Interest cost 1,815 1,750 11 12 Plan participants’ contributions — — 641 536 Actuarial (gain) loss 1,146 437 (81 ) 64 Foreign currency exchange rate change (8,402 ) 9,934 — — Gross benefits paid (1,097 ) (1,128 ) (626 ) (631 ) Curtailments and settlements (11,411 ) (5,642 ) — — Acquisitions — 106,566 — — Benefit obligation at end of year $ 148,440 $ 161,673 $ 312 $ 367 Change in Plan Assets Fair value of plan assets at beginning of year $ 71,491 $ 10,004 $ — $ — Actual return on plan assets 1,165 2,594 — — Foreign currency exchange rate changes (3,161 ) 3,831 — — Employer contributions 7,882 4,766 (15 ) 95 Settlements (12,379 ) (5,659 ) — — Plan participants’ contributions — — 641 536 Gross benefits paid (1,096 ) (1,128 ) (626 ) (631 ) Acquisitions — 57,083 — — Fair value of plan assets at end of year $ 63,902 $ 71,491 $ — $ — Funded status at end of year Fair value of plan assets $ 63,902 $ 71,491 $ — $ — Benefit obligations (148,440 ) (161,673 ) (312 ) (367 ) Amount recognized at end of year $ (84,538 ) $ (90,182 ) $ (312 ) $ (367 ) The Company expects to contribute $5.1 million to the pension plans in fiscal year 2020 , which includes direct contributions to be made for funded plans and benefit payments to be made for unfunded plans. The Company does not pre-fund its post-retirement health care and life insurance benefit plans. As a result, the Company is responsible annually for the payment of benefits as incurred by the plans. The Company anticipates making payments of $0.1 million during fiscal year 2020 . Amounts recognized in the Consolidated Balance Sheets at March 31, 2019 and 2018 consist of the following (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Noncurrent asset $ 670 $ — $ — $ — Current liability $ (2,753 ) $ (7,000 ) $ (50 ) $ (54 ) Noncurrent liability (82,455 ) (83,182 ) (262 ) (313 ) Net Amount recognized, end of year $ (84,538 ) $ (90,182 ) $ (312 ) $ (367 ) Amounts recognized in Accumulated other comprehensive income (loss) at March 31, 2019 and 2018 consist of the following (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Net actuarial loss (gain) $ 16,864 $ 15,691 $ (793 ) $ (879 ) Prior service cost 1,325 1,413 — — Accumulated other comprehensive (income) loss $ 18,189 $ 17,104 $ (793 ) $ (879 ) Although not reflected in the table above, the tax effect on the pension balances was $2.4 million and $2.3 million as of March 31, 2019 and 2018 , respectively. The components of net periodic benefit (income) costs for the fiscal years ended March 31, 2019 , 2018 and 2017 are as follows (amounts in thousands): Pension Other Benefits 2019 2018 2017 2019 2018 2017 Net service cost $ 4,716 $ 4,585 $ 1,298 $ — $ — $ — Interest cost 1,815 1,750 1,297 11 12 11 Expected return on plan assets (1) (2,037 ) (1,956 ) (346 ) — — — Amortization: Actuarial (gain) loss (2) 396 393 419 (167 ) (191 ) (207 ) Prior service cost 87 87 82 — — — Recurring activity 4,977 4,859 2,750 (156 ) (179 ) (196 ) One time expense (income) 115 (71 ) (11 ) — — — Net periodic benefit cost (credit) $ 5,092 $ 4,788 $ 2,739 $ (156 ) $ (179 ) $ (196 ) _______________________________________________________________________________ (1) The Company has elected to use the actual fair value of plan assets as the market-related value of assets in the determination of the expected return on plan assets. (2) Actuarial gains and losses are amortized using a corridor approach. The total unrecognized amount of cumulative actuarial gain or loss in excess of 10% of the greater of the market value of assets or the projected benefit obligation is amortized over the average remaining service of active employees/lifetime of plan participants for plans with no active participants. All of the amounts in the table above, other than net service cost, were recorded in the line item “Other (income) expense, net” in the Consolidated Statements of Operations. The estimated amounts related to pensions that will be amortized from accumulated other comprehensive income into net periodic benefit costs in fiscal year 2020 are actuarial losses of $0.5 million , and prior service costs of $0.1 million . The estimated amounts related to other benefits that will be amortized from accumulated other comprehensive income into net periodic benefit costs in fiscal year 2020 are actuarial gains of $0.1 million . The asset allocation for the Company’s defined benefit pension plans at March 31, 2019 and the target allocation for 2019 , by asset category, are as follows: Asset Category Target Allocation (%) Plan Assets at March 31, 2019 (%) Insurance (1) 1 1 International equities 34 31 International bonds 61 61 Other 4 7 Total 100 100 _______________________________________________________________________ (1) Comprised of assets held by the defined benefit pension plan in Germany. The Company’s investment strategy for its defined benefit pension plans is to maximize long-term rate of return on plan assets within an acceptable level of risk to minimize the cost of providing pension benefits. The investment policy establishes a target allocation range for each asset class and the fund is managed within those ranges. The plans use a number of investment approaches including insurance products, equity and fixed income funds in which the underlying securities are marketable in order to achieve this target allocation. Certain plans invest solely in insurance products. The Company continuously monitors the performance of the overall pension asset portfolio, asset allocation policies, and the performance of individual pension asset managers and makes adjustments and changes, as required. The Company does not manage any assets internally, does not have any passive investments in index funds, and does not directly utilize futures, options, or other derivative instruments or hedging strategies with regard to the pension plans; however, the investment mandate of some pension asset managers allows the use of the foregoing as components of their portfolio management strategies. The expected rate of return was determined by modeling the expected long-term rates of return for broad categories of investments held by the plan against a number of various potential economic scenarios. Other changes in plan assets and benefit obligations recognized in Accumulated other comprehensive income (loss) are as follows (amounts in thousands): Pension Other Benefits 2019 2018 2017 2019 2018 2017 Current year actuarial (gain) loss $ 1,684 $ (184 ) $ 1,229 $ (81 ) $ 64 $ (228 ) Amortization of actuarial gain (loss) (511 ) (322 ) (619 ) 167 191 208 Current year prior service cost — — — — — — Amortization of prior service cost (87 ) (87 ) (82 ) — — — Total recognized in other comprehensive income $ 1,086 $ (593 ) $ 528 $ 86 $ 255 $ (20 ) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 6,178 $ 4,195 $ 3,267 $ (70 ) $ 76 $ (216 ) Each of these changes has been factored into the following benefit payments schedule for the next ten fiscal years. The Company expects to have benefit payments in the future as follows (amounts in thousands): Expected benefit payments 2020 2021 2022 2023 2024 2025- 2029 Pension benefits $ 6,707 $ 6,679 $ 8,416 $ 8,126 $ 9,828 $ 54,107 Other benefits 51 47 42 37 33 105 Total $ 6,758 $ 6,726 $ 8,458 $ 8,163 $ 9,861 $ 54,212 The following weighted-average assumptions were used to determine the projected benefit obligation at the measurement date and the net periodic cost for the pension and post-retirement plan (amounts in thousands except percentages): Pension Other Benefits 2019 2018 2019 2018 Projected benefit obligation: Discount rate 1.2 % 1.2 % 3.3 % 3.5 % Rate of compensation increase 3.5 % 3.5 % — % — % Health care cost trend on covered charges 6.5% 7.0% Net periodic benefit cost: Discount rate 1.3 % 1.2 % 3.5 % 3.2 % Rate of compensation increase 3.5 % 3.5 % — % — % Expected return on plan assets 3.0 % 3.0 % — % — % Health care cost trend on covered charges 7.0% decreasing to ultimate trend of 5.0% in 2022 7.0% The measurement date used to determine pension and post-retirement benefits is March 31. The Company evaluated input from its third-party actuary to determine the appropriate discount rate. The determination of the discount rate is based on various factors such as the rate on bonds, term of the expected payouts, and long-term inflation factors. The following table sets forth by level, within the fair value hierarchy as described in Note 1, the pension plan’s assets, required to be carried at fair value on a recurring basis as of March 31, 2019 and March 31, 2018 (amounts in thousands): Fair Value March 31, 2019 Fair Value Measurement Using Fair Value March 31, 2018 Fair Value Measurement Using Level 1 Level 2 (1) Level 3 (2) Level 1 Level 2 Level 3 Cash and cash equivalents $ 319 $ 319 $ — $ — $ 193 $ 193 $ — $ — Equity securities: International equities 19,965 — 19,965 — 22,391 — 22,391 — Fixed income securities: International bonds 39,030 — 39,030 — 43,742 — 43,742 — Insurance contracts 642 — — 642 697 — — 697 Diversified growth funds 3,946 — 3,946 — 4,468 — 4,468 — $ 63,902 $ 319 $ 62,941 $ 642 $ 71,491 $ 193 $ 70,601 $ 697 ___________________________________________ (1) Level 2 plan assets consist of pooled investment funds which are unquoted and have no restriction on redemption. Fair value was determined using daily, weekly, or monthly trading activity which derives the unit price of the pooled fund. (2) Level 3 plan assets are invested in reinsurance contracts whose value is the sum of the actuarial reserve and the profit participation of each contract. The actuarial reserve is the sum of discounted cash flows associated with future benefits and premiums. The table below sets forth a summary of changes in the fair value of the defined benefit pension plan’s Level 3 assets for the fiscal years ended March 31, 2018 and March 31, 2019 (amounts in thousands): Balance at March 31, 2017 $ 580 Actual return on plan assets 41 Employer contributions 219 Benefits paid (233 ) Foreign currency exchange rate change 90 Balance at March 31, 2018 $ 697 Actual return on plan assets 20 Employer contributions 233 Benefits paid (247 ) Foreign currency exchange rate change (61 ) Balance at March 31, 2019 $ 642 The Company also sponsors a deferred compensation plan for highly compensated employees. The plan is non-qualified and allows certain employees to contribute to the plan. Company matches, net of gains (losses) related to the deferred compensation plan, were $0.1 million in fiscal year 2019 , $0.2 million in fiscal year 2018 , and $0.2 million in fiscal year 2017 . Total benefits accrued under this plan were $2.3 million and $2.1 million at March 31, 2019 and March 31, 2018 , respectively. In addition, the Company has a defined contribution retirement plan (the “Savings Plan”) in which all United States employees who meet certain eligibility requirements may participate. A participant may direct the Company to contribute amounts, based on a percentage of the participant’s compensation, to the Savings Plan through the execution of salary reduction agreements. In addition, the participants may elect to make after-tax contributions. The Company matches contributions to the Savings Plan up to 6% of the employee’s salary. The Company made matching contributions of $2.8 million , $2.2 million and $2.4 million in fiscal years 2019 , 2018 , and 2017 , respectively.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation The Company’s stock-based compensation plans are broad-based, long-term retention programs intended to attract and retain talented employees and align stockholder and employee interests. The major components of stock-based compensation expense are as follows (amounts in thousands): Fiscal year ended March 31, 2019 Fiscal year ended March 31, 2018 Fiscal year ended March 31, 2017 Stock Options Restricted Stock LTIPs Stock Options Restricted Stock LTIPs Stock Options Restricted Stock LTIPs Cost of sales $ — $ 1,502 $ 1,254 $ — $ 865 $ 654 $ 21 $ 634 $ 729 Selling, general and administrative expenses — 7,338 2,413 — 4,195 1,695 20 1,490 1,620 Research and development — 88 271 — 46 202 1 26 179 $ — $ 8,928 $ 3,938 $ — $ 5,106 $ 2,551 $ 42 $ 2,150 $ 2,528 Employee Stock Options As of March 31, 2019 , the KEMET Corporation Omnibus Incentive Plan (the “Incentive Plan”), which amended and restated the KEMET Corporation 2014 Amendment and Restatement of the KEMET Corporation 2011 Omnibus Equity Incentive Plan, approved by the Company’s stockholders on August 2, 2017, is the only plan the Company has to issue equity-based awards to executives and key employees. Upon adoption of the Incentive Plan, no further awards were permitted to be granted under the Company’s prior plans, including the 1992 Key Employee Stock Option Plan, the 1995 Executive Stock Option Plan, and the 2004 Long-Term Equity Incentive Plan (collectively, the “Prior Plans”). The Incentive Plan has authorized, in the aggregate, the grant of up to 12.2 million shares of the Company’s Common Stock, comprised of 11.4 million shares under the Incentive Plan and 0.8 million shares remaining from the Prior Plans and authorizes the Company to provide equity-based compensation in the form of: • stock options, including incentive stock options, entitling the optionee to favorable tax treatment under Section 422 of the Code; • stock appreciation rights; • restricted stock and restricted stock units ("RSUs"); • other share-based awards; and • performance awards. Options issued under these plans vest within one to three years and expire ten years from the grant date. If available, the Company issues shares of Common Stock from treasury stock upon exercise of stock options and vesting of restricted stock units. The Company has no plans to purchase additional shares in conjunction with its employee stock option plans in the near future. Employee stock option activity for fiscal year 2019 is as follows: Options (in thousands) Weighted- Average Exercise Price Outstanding at April 1, 2018 230 $ 6.36 Exercised (74 ) 6.42 Expired (1 ) 1.92 Outstanding at March 31, 2019 155 6.37 Exercisable at March 31, 2019 155 $ 6.37 Remaining weighted average contractual life of options exercisable (years) 2.84 Remaining weighted average contractual life of options outstanding (years) 2.84 Amounts included in the following table are in thousands, except weighted average fair value and weighted average exercise price: Fiscal Years Ended 2019 2018 2017 Weighted average grant-date fair value of non-vested shares $ — $ — $ 2.72 Weighted average grant-date fair value of shares Granted — — — Vested — — 2.72 Forfeited — — 2.72 Total estimated fair value of shares vested — — 223 Intrinsic value Stock options exercised 1,296 6,914 890 Options outstanding 1,644 2,713 Options currently exercisable 1,644 2,713 Total unrecognized compensation cost, non-vested options — Weighted-average period of recognition for unrecognized compensation cost (in years) N/A Weighted average exercise price of stock options expected to vest N/A All option plans provide that options to purchase shares be supported by the Company’s authorized but unissued common stock or treasury stock. All restricted stock and performance awards are also supported by the Company’s authorized but unissued common stock or treasury stock. The prices of the options granted pursuant to these plans are not less than 100% of the value of the shares on the date of the grant. Restricted Stock Units (“RSU’s”) and Long-term Incentive Plans (“LTIP”) The Company grants RSUs to members of the Board of Directors (“Board”), the Chief Executive Officer and a limited group of executives. In fiscal year 2019 , RSUs granted to the Board vested immediately and RSUs granted to certain officers under the key manager stock program vest over 3 years . Once vested, RSUs are converted into restricted shares of common stock, except for RSUs granted to members of the Board, who can elect to defer settlement of the RSUs to a later date. Restricted shares cannot be sold until 90 days after the Chief Executive Officer, executive, key manager, or member of the Board, as applicable, resigns from his or her position, or until the KEMET employee achieves the targeted ownership under the Company’s stock ownership guidelines, and only to the extent that such ownership exceeds the target. As of March 31, 2019 , and 2018 , unrecognized compensation costs related to the non-vested restricted stock share-based compensation arrangements granted were $8.0 million and $8.1 million , respectively. The expense is being recognized over the respective vesting periods. Historically the Board of the Company has approved annual LTIPs which cover two -year periods and are primarily based upon the achievement of an adjusted EBITDA range for the two-year period. At the time of the award, the individual plans entitle the participants to receive cash or RSUs, or a combination of both as determined by the Company's Board. The Company assesses the likelihood of meeting the Adjusted EBITDA financial metric on a quarterly basis and adjusts compensation expense to match expectations. The 2016/2017 LTIP, 2017/2018 LTIP, 2018/2019 LTIP and 2019/2020 LTIP also awarded time-based RSUs which vest over the course of three years from the anniversary of the establishment of the plan and are not subject to a performance metric. Any related liability (for the cash portion of the LTIP) is reflected in the line item “Accrued expenses” on the Consolidated Balance Sheets and any restricted stock commitment is reflected in the line item “Additional paid-in capital” on the Consolidated Balance Sheets. As of March 31, 2019 and 2018 , unrecognized compensation costs related to the cash portion of LTIP arrangements granted were $2.4 million and $0.1 million , respectively. As of March 31, 2019 and 2018 , unrecognized compensation costs related to the stock portion of LTIP arrangements granted were $4.1 million and $1.6 million , respectively. The expense is being recognized over the respective vesting periods. The following is the performance-based vesting schedule of RSUs under each respective LTIP, subject to the respective participant’s continued employment with KEMET (shares in thousands): 2019/2020 2018/2019 (1) 2017/2018 (1) 2016/2017 Performance-based award vested fiscal year 2019 — — — 173 Performance-based award vesting fiscal year 2020 104 — — — Potential performance-based award vesting fiscal year 2021 (2) 104 — — — ___________________________________________ (1) The performance portion of the 2018/2019 and 2017/2018 LTIP are payable in cash. (2) Estimated shares to vest based upon current performance expectations. The final number of shares depends on the achievement of performance metrics. The following is the time-based vesting schedule of RSUs under each respective LTIP, subject to the respective participant’s continued employment with KEMET (shares in thousands): 2019/2020 2018/2019 2017/2018 2016/2017 Time-based award vested fiscal year 2019 13 85 224 191 Time-based award vesting fiscal year 2020 53 58 156 — Time-based award vesting fiscal year 2021 53 60 — — Time-based award vesting fiscal year 2022 54 — — — RSU activity, including performance-based and time-based LTIP activity, for fiscal year 2019 is as follows (amounts in thousands except fair value): Shares Weighted- average Fair Value on Grant Date Non-vested restricted stock at April 1, 2018 2,452 $ 7.96 Granted 910 19.43 Vested (1) (1,789 ) 7.67 Forfeited (2) (158 ) 12.68 Non-vested restricted stock at March 31, 2019 1,415 $ 15.19 __________________________________________ (1) 33,292 in RSUs were settled for $0.2 million in cash. (2) 85,956 in RSUs were forfeited by Per-Olof Loof, the Company's former Chief Executive Officer upon his resignation in December 2018. Vested shares in the table above include the acceleration of 275,000 shares related to the April 18, 2018 Amended and Restated Employment Agreement for the former Chief Executive Officer, which amended and restated Mr. Loof's prior employment agreement with the Company dated June 29, 2015. Upon the signing of the Amended and Restated Employment Agreement, certain RSUs previously granted to Mr. Loof on June 29, 2015, totaling 175,000 shares, and on September 6, 2017, totaling 100,000 shares, both of which were scheduled to vest over time, became fully vested. Incremental compensation cost resulting from the modification totaled $1.7 million . Additionally, vested shares in the table above include the acceleration of 44,302 shares related to the March 20, 2019 Employment Agreement for the current Chief Executive Officer William Lowe. Upon the signing of the Employment Agreement, certain RSUs previously granted to Mr. Lowe on May 18, 2016, totaling 20,220 shares, May 18, 2017, totaling 11,237 shares, and May 18, 2018, totaling 12,845 shares, each of which were scheduled to vest over time, became fully vested. Incremental compensation cost resulting from the modification totaled $0.2 million . In the Operating activities section of the Consolidated Statements of Cash Flows, stock-based compensation expense was treated as an adjustment to net income for fiscal years 2019 , 2018 and 2017 .

Income Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The components of income before income taxes and equity income (loss) from equity method investments are as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Domestic (U.S.) (1) $ 95,639 $ 141,582 $ (67 ) Foreign (Outside U.S.) (1) 74,792 45,485 9,875 Total (1) $ 170,431 $ 187,067 $ 9,808 ______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. The provision for income tax expense (benefit) is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Current: Federal $ 170 $ 223 $ — State and local 161 50 62 Foreign 9,966 8,295 4,247 Total current income tax expense from continuing operations 10,297 8,568 4,309 Deferred: Federal (43,804 ) (807 ) (6 ) State and local (773 ) (96 ) (97 ) Foreign (1) (5,180 ) 1,467 88 Deferred tax expense (benefit) from continuing operations (1) (49,757 ) 564 (15 ) Provision for income tax expense (benefit) (1) $ (39,460 ) $ 9,132 $ 4,294 ______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. The Company realized a deferred tax expense (benefit) for fiscal years ended 2019 , 2018 and 2017 of ($50.1) million , $0.6 million and $1.2 million , respectively, in U.S. and certain foreign jurisdictions based on changes in judgment about the realizability of deferred tax assets in future years. Differences between the provision for income taxes on earnings from continuing operations and the amount computed using the U.S. Federal statutory income tax rate are as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Amount computed using the statutory rate (1) $ 35,791 $ 59,162 $ 3,722 Change in U.S. valuation allowance (67,761 ) (66,948 ) (7,080 ) Unremitted earnings of foreign subsidiaries — — 2,127 Effect of prior year adjustments (2) 2,450 (1,337 ) 1,789 IRC section 162(m) limitation (3) 4,553 — — Expired foreign tax credits — 407 4,766 Taxable foreign source income 3,502 22,238 1,835 (Put)/call option valuation impact — — (3,745 ) Non-taxable gain from bargain purchase — (41,292 ) — Deduction related to APA settlement (2,309 ) — — Tax-deductible equity compensation (4,215 ) (5,699 ) (44 ) Other non-deductible expenses (44 ) 220 (893 ) Differences due to U.S. tax law changes (4) — 50,420 — State income taxes, net of federal taxes (5) (695 ) (3,325 ) (35 ) Change in foreign operations tax exposure reserves 132 1,059 108 Foreign tax rate differential 6,501 (400 ) 587 Change in foreign tax law (1,956 ) 251 144 Change in foreign operations valuation allowance (6) (41,133 ) (6,676 ) 983 Nondeductible expenses related to antitrust litigation 14,360 488 — Other effect of foreign operations 11,364 564 30 Provision for income tax expense (benefit) $ (39,460 ) $ 9,132 $ 4,294 ___________________________________________ (1) The statutory income tax rate for the fiscal year ended March 31, 2017 is 35%. The Tax Cuts and Jobs Act enacted on December 22, 2017 reduced the U.S. federal corporate tax rate from 35% to 21%, effective January 1, 2018. Based on the fiscal year of the Company ending on March 31, the statutory income tax rate for the fiscal year ended March 31, 2018 is a blended rate of 31.6% based on the number of days in the fiscal year before January 1, 2018 and the number of days in the fiscal after December 31, 2017. The statutory income tax rate for the fiscal year ended March 31, 2019 is 21%. (2) The effect of prior year adjustments was offset by a full valuation allowance resulting in no impact on the provision for income taxes. (3) Fiscal year ended March 31, 2019 difference consist of $1.5 million related to the expansion of the Sec. 162(m) limitation due to tax law changes. (4) Fiscal year end March 31, 2018 differences due to tax law changes consists of $4.8 million related to foreign earnings and $45.6 million related to tax rate adjustment. $45.6 million related to tax rate adjustment is the gross deferred rate change, which is offset by valuation allowance adjustment, resulting in a net benefit of $0.8 million . (5) Fiscal year ended March 31, 2018 difference consists mainly of $3.7 million related to the revaluation of state net operating loss carryforwards as a result of the change in the federal tax rate. (6) The change in foreign operations valuation allowance excludes other comprehensive income and currency translation adjustments of $3.8 million , $(3.4) million , and $0.9 million for fiscal years ended 2019 , 2018 and 2017 , respectively, which has no impact on the provision for income taxes. The foreign jurisdictions having the greatest effect on the provision for income taxes are China and Mexico. The statutory tax rates for China and Mexico are 25% and 30% , respectively. The combined provision for income taxes for China and Mexico for fiscal years ended 2019 , 2018 and 2017 is $5.7 million , $3.8 million , and $3.1 million , respectively. The components of deferred tax assets and liabilities are as follows (amounts in thousands): March 31, 2019 2018 Deferred tax assets: Net operating loss carry forwards $ 78,986 $ 115,064 Sales allowances and inventory reserves 10,967 9,675 Medical and employee benefits 35,298 38,572 Depreciation and differences in basis 5,318 6,241 Accrued restructuring 469 2,551 Anti-trust fines and settlements 910 16,575 Tax credits 3,394 4,208 Stock-based compensation 5,589 1,765 Other (1) 1,342 2,812 Total deferred tax assets before valuation allowance 142,273 197,463 Less valuation allowance (58,658 ) (171,401 ) Total deferred tax assets 83,615 26,062 Deferred tax liabilities: Unremitted earnings of subsidiaries (21,850 ) (11,678 ) Amortization of intangibles and debt discounts (11,996 ) (14,054 ) Non-amortized intangibles (1,551 ) (1,551 ) Total deferred tax liabilities (35,397 ) (27,283 ) Net deferred tax assets (liabilities) $ 48,218 $ (1,221 ) __________________________________________________________________ (1) March 31, 2018 adjusted due to the adoption of ASC 606. The following table presents the annual activities included in the deferred tax valuation allowance (amounts in thousands): Valuation Allowance for Deferred Tax Assets Balance at March 31, 2016 $ 170,917 Charge (benefit) to costs and expenses (2,094 ) Deductions (4,925 ) Balance at March 31, 2017 163,898 Charge to costs and expenses 8,647 Deductions (1,144 ) Balance at March 31, 2018 171,401 Charge (benefit) to costs and expenses (112,080 ) Deductions (663 ) Balance at March 31, 2019 $ 58,658 In fiscal year 2019 , the valuation allowance decreased $112.7 million , of which $44.9 million related to a valuation allowance decrease for the foreign group and $67.8 million related to a valuation allowance decrease for the U.S. group. The $44.9 million decrease in valuation allowance related to the foreign group primarily is comprised of a $35.5 million decrease related to changes in temporary differences and net operating utilizations and a $5.5 million release in valuation allowance. The $67.8 million decrease in the valuation allowance related to the U.S. group primarily is comprised of a $26.9 million decrease related to utilization of net operating loss carryforwards and a $44.2 million release in valuation allowance. In fiscal year 2018 , the valuation allowance increased $7.5 million , of which $74.4 million related to a valuation allowance increase for the foreign group and $66.9 million related to a valuation allowance decrease for the U.S. group. The $66.9 million decrease in valuation allowance related to the U.S. group primarily is comprised of a $49.4 million decrease from the repricing of deferred tax assets under U.S. tax reform, and a $21.1 million decrease from the additional investment in TOKIN. The $74.4 million increase in valuation allowance related to the foreign group is comprised of a $78.2 million increase due to opening balance sheet adjustments from the acquisition of TOKIN, and a decrease of $3.8 million from other foreign operations. In fiscal year 2017 , the valuation allowance decreased $7.0 million , primarily of which $4.8 million is related to the expiration of foreign tax credit carryovers that were held by the U.S. group and $1.2 million related to the investment in TOKIN. The change in net deferred income tax asset (liability) for the current year is presented below (amounts in thousands): Balance at March 31, 2018 (1) $ (1,221 ) Deferred income taxes related to continuing operations 49,757 Deferred income taxes related to other comprehensive income (223 ) Foreign currency translation (95 ) Balance at March 31, 2019 $ 48,218 ___________________________________________________________ (1) March 31, 2018 adjusted due to the ASC 606. As of March 31, 2019 , and 2018 , the Company’s gross deferred tax assets were reduced by a valuation allowance of $58.7 million and $171.4 million , respectively. A remaining valuation allowance on a portion of U.S. deferred tax assets was determined to be necessary based on the existence of significant negative evidence. The amount of future income required for the Company to realize its net deferred tax assets is $227.1 million . In assessing the realizability of deferred tax assets in foreign jurisdictions, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and projections for future taxable income over the periods in which the deferred tax assets are deductible, management believes it is more likely than not that the Company will realize the benefits of these deductible differences, net of the existing valuation allowances as of March 31, 2019 . However, the amount of deferred tax assets considered realizable could be reduced in the near term if estimates of future taxable income during the carryforward period are reduced. As of March 31, 2019 , the Company had U.S. federal net operating loss carryforwards of $114.3 million . These U.S. federal net operating losses were incurred from fiscal years 2006 through 2018 and are available to offset future federal taxable income, if any, through 2037. The Company had state net operating losses of $525.1 million , of which $3.6 million will expire in one year if unused. These state net operating losses are available to offset future state taxable income, if any, through 2039. Foreign subsidiaries, primarily in Japan, Italy, Thailand, Hong Kong, United Kingdom, and Sweden, had net operating loss carryforwards totaling $135.3 million of which none will expire within one year if unused. The net operating losses in Thailand and Japan are available to offset future taxable income through 2025 and 2029, respectively. The net operating losses in Italy, Hong Kong, United Kingdom, and Sweden are available indefinitely to offset future taxable income. For a portion of the U.S. federal and some state jurisdictions there is a greater likelihood of not realizing the future tax benefits of these deferred tax assets, and, accordingly, the Company has recorded valuation allowances of $16.9 million related to the net deferred tax assets in these jurisdictions. For the foreign jurisdictions with net operating loss carryforwards, a valuation allowance has been recorded where the Company does not expect to fully realize the deferred tax assets in the future. Utilization of the Company’s net operating loss carryforwards may be subject to substantial annual limitation due to the ownership change limitations provided by the Internal Revenue Code of 1986, as amended (the “Code”) and similar state provisions. Such an annual limitation could result in the expiration of the net operating loss and tax credit carryforwards before utilization. If such an ownership change were deemed to have occurred, the amount of our taxable income that could be offset by the Company’s net operating loss carryovers in taxable years after the ownership change would be severely limited. KBP was acquired which has substantial federal net operating losses that are limited due to the ownership change which occurred. At March 31, 2019 , the U.S. consolidated group of companies had the following tax credit carryforwards available (amounts in thousands): Tax Credits ($) Fiscal Year of Expiration U.S. research credits $ 1,253 2024 Texas franchise tax credits 2,141 2026 The Company conducts business in Macedonia and Thailand through subsidiaries that qualify for a tax holiday. The tax holiday for Macedonia will terminate on January 1, 2023. For calendar years 2017 , 2018 , and 2019 , the statutory rate of 10% was reduced to zero . The tax holiday for Thailand will terminate on June 15, 2020. For the 2019 fiscal year, the statutory rate of 20% was reduced to zero . For the fiscal year ended March 31, 2019 the Company realized no income tax benefit from the tax holidays. Prior to the Tax Cuts and Jobs Act of 2017, earnings of a foreign subsidiary were taxed when remitted to the U.S. With the Tax Cuts and Jobs Act of 2017, the Company is permitted a 100% exemption from U.S. tax on foreign earnings remitted to the U.S. and the U.S group recognizes no deferred tax liability at March 31, 2019 relating to unremitted foreign earnings. The Company asserts that no foreign earnings subject to a withholding tax will be remitted to the U.S. At March 31, 2019 , the Company had $7.7 million of unrecognized tax benefits. A reconciliation of gross unrecognized tax benefits (excluding interest and penalties) is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Beginning of fiscal year $ 8,680 $ 7,390 $ 7,103 Additions from business combinations — 1,270 — Additions for tax positions of the current year 2,027 1,078 762 Additions for tax positions of prior years 519 — — Reductions for tax positions of prior years (633 ) (1,058 ) (64 ) Lapse in statute of limitations (9 ) — (411 ) Settlements (2,923 ) — — End of fiscal year $ 7,661 $ 8,680 $ 7,390 At March 31, 2019 , $1.9 million of the $7.7 million of unrecognized income tax benefits would affect the Company’s effective income tax rate, if recognized. It is reasonably possible that the total unrecognized tax benefit could decrease by $1.0 million in fiscal year 2020 if the advanced pricing arrangement for one of the Company’s foreign subsidiaries is agreed to by the foreign tax authority and an ongoing audit in one of the Company’s foreign jurisdictions is settled. The Company files income tax returns in the U.S. and multiple foreign jurisdictions, including various state and local jurisdictions. The U.S. Internal Revenue Service concluded its examinations of the Company’s U.S. federal tax returns for all tax years through 2003. Because of net operating losses, the Company’s U.S. federal returns for 2003 and later years will remain subject to examination until the losses are utilized. The Company is subject to income tax examinations in various foreign and U.S. state jurisdictions for the years 2014 and forward. The Company records potential interest and penalty expenses related to unrecognized income tax benefits within its global operations in income tax expense. The Company had $0.5 million and $0.9 million of accrued interest and penalties respectively at March 31, 2019 and 2018 , which are included as a component of income tax expense. To the extent interest and penalties are not assessed with respect to uncertain tax positions, amounts accrued will be reduced and reflected as a reduction of the overall income tax provision. Tax Cuts and Jobs Act The Tax Cuts and Jobs Act (the “Act”) was enacted on December 22, 2017. The Act reduced the US federal corporate tax rate from 35% to 21%, required companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and created new taxes on certain foreign-sourced earnings. In fiscal year 2018, the Company recorded provisional amounts for certain enactment-date effects of the Act by applying the guidance in SAB 118, because the Company had not yet completed its accounting for all of the tax effects of the Act. Certain provisions of the Act did not impact the Company until fiscal year 2019. These provisions include, but are not limited to, the base erosion anti-abuse tax (“BEAT”), the provision designed to tax global intangible low-taxed income (“GILTI”), the foreign-derived intangible income (“FDII”) provision, the expansion of the IRC Sec. 162(m) limitation, and the provision designed to limit interest expense deductions. In fiscal year 2019, the Company completed its accounting for the enactment-date income tax effects of the Act, based on legislative updates relating to the Act currently available. These tax effects related to the one-time transition tax, the reduced corporate tax rate, and an additional limitation for executive compensation under IRC Sec. 162(m). The Company recognized the below adjustments as a component of income tax expense. One-time Transition Tax The one-time transition tax is based on the Company’s total post-1986 earnings and profits which were previously deferred from U.S. income taxes under U.S. law. In previous periods, the Company recorded provisional amounts for its one-time transition tax liability for each of its foreign subsidiaries, and the amounts were offset by utilizing net operating losses that had been carried forward from prior years. Upon further analysis of the Act and notices and regulations issued and proposed under Internal Revenue Code (“IRC”) Section 965 by the U.S. Department of Treasury and the Internal Revenue Service, the Company finalized its calculations of the transition tax liability during the current reporting period. The final net taxable income the Company reported on its 2018 federal income tax return under IRC Section 965, after allowable deductions under IRC Section 965(c), was $34.3 million . The amount was included as a component of income tax expense and offset by federal net operating loss carryover utilizations, resulting in a net income tax expense of zero. There is no impact to foreign locations. Deferred tax assets and liabilities During the period ended March 31, 2018, the Company had recognized a $0.8 million tax benefit related to the US federal corporate tax rate change to its existing deferred tax balances. The amount was included as a component of income tax expense for fiscal year 2018. Global intangible low-taxed income The Act subjects a U.S. shareholder to tax on GILTI earned by certain foreign subsidiaries. The Financial Accounting Standards Board (“FASB”) Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed income , states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years, or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. The Company has elected to account for GILTI as a period cost in the year the tax is incurred. At March 31, 2019 , the Company estimates that it will have no additional taxable income from GILTI for the 2019 fiscal year. Foreign-Derived Intangible Income The Act provides tax incentives to U.S. companies to earn income from the sale, lease, or license of goods and services abroad in the form of a deduction for foreign-derived intangible income. The tax law limits the amount of the FDII deductions to the U.S. shareholder’s taxable income. At March 31, 2019 , the Company estimates to utilize net operating loss carryovers to absorb its taxable income for the fiscal year 2019. As a result, the Company is not estimating any taxable income deduction related to FDII. Base Erosion Anti-Abuse Tax Under the Act, an entity must pay a BEAT tax, if the BEAT is greater than its regular tax liability. The BEAT calculation eliminates the deduction of certain payments made to foreign affiliates, referred to as base erosion payments, but applies a lower tax rate on the resulting BEAT income. During the fiscal year ended March 31, 2019 , the Company's Base Erosion Percentage was below the 3.0% threshold, and as a result, the Company estimated no additional tax expense related to the BEAT for the 2019 fiscal year. Interest Expense Deduction Limits The Act limits the deduction for net interest expense incurred by U.S. corporations for amounts that exceed 30% of the corporation’s adjusted taxable income for the year. The adjusted taxable income is computed initially excluding depreciation, amortization, or depletion and includes these items beginning in the year 2022. The Act permits an indefinite carryforward of any disallowed business interest expense. At March 31, 2019 , the Company estimates that its net interest expense deductions for the fiscal year 2019 will not be limited. Executive Compensation Limits The Act made significant changes to the $1.0 million tax deduction limitation for publicly held corporations under IRC Sec. 162(m). The changes included the repeal of an exclusion for qualified performance-based compensation and broadened the group of possible covered employees subject to the deduction limit. For the fiscal year 2019, the Company estimates an additional deduction limitation of $7.0 million as a result of this law change.

Derivatives

Derivatives	12 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Certain of the Company’s foreign operations expose the Company to fluctuations in currency exchange rates. These fluctuations may impact the value of the Company’s cash payments, assets, and liabilities in terms of the Company’s functional currency. The Company enters into derivative financial instruments to protect the value of certain obligations and its net investment in its TOKIN subsidiary in terms of its functional currency, the U.S. dollar. The Company’s primary exposure to foreign currency exchange rate risk relates to (i) intercompany financings with TOKIN, (ii) its net investment in TOKIN, and (iii) certain operating expenses at the Company’s Mexican facilities. The principal objective of such arrangements is to minimize the risks and/or costs associated with the Company’s operating and financial structure as well as to hedge specific anticipated transactions. The Company does not utilize derivatives for speculative or other purposes other than currency risk management. The use of derivative financial instruments carries certain risks, including the risk that any counterparty to a contractual arrangement may not be able to perform under the agreement. To mitigate this risk, the Company only enters into derivative financial instruments with a counterparty that is a major financial institution with a high credit rating. The Company does not anticipate that the counterparty will fail to meet its obligations. Each derivative instrument that qualifies for hedge accounting is expected to be highly effective at reducing the risk associated with the exposure being hedged, and the Company monitors each instrument for effectiveness on a quarterly basis. The Company formally documents all relationships between hedging instruments and hedged items, as well as risk management objectives and strategies for undertaking various hedge transactions. Changes in fair value of all its derivative instruments are reported in earnings or in AOCI, depending on whether the derivative is designated as part of a hedge transaction, and if so, the type of hedge transaction. The Company records all derivative financial instruments on its Consolidated Balance Sheets at fair value. Certain of the derivative instruments are subject to master netting agreements and are presented in the Consolidated Balance Sheets on a net basis. If the Company were to account for the asset and liability balances of those derivative contracts on a gross basis, the amounts presented in the Consolidated Balance Sheets would be adjusted from the current net presentation to the gross amounts as detailed in the table below. The balance sheet classifications and fair value of derivative instruments designated as hedges as of March 31, 2019 and 2018 are as follows (amounts in thousands): Fair Value of Derivative Instruments March 31, 2019 March 31, 2018 Hedge Designation Balance Sheet Location As Presented Offset Gross As Presented Offset Gross Derivative assets Cross-currency swaps Fair Value Other assets $ 3,485 $ — $ 3,485 $ — $ — $ — Cross-currency swaps Net Investment Other assets 1,092 — 1,092 — — — Foreign exchange contracts Cash Flow Prepaid and other current assets 564 645 1,209 1,154 — 1,154 Derivative liabilities Foreign exchange contracts Cash Flow Accrued expenses — 645 645 — — — Fair Value Hedging Strategy The Company entered into two cross-currency swaps designated as fair value hedges on November 7, 2018 to hedge the foreign currency risk on the Intercompany Loans. These agreements are contracts to exchange floating-rate payments in one currency with floating-rate payments in another currency. These swaps are intended to offset in the same period the remeasurement of the carrying value of the underlying foreign currency Intercompany Loans. Changes in the fair value of these cross-currency swaps due to changes in foreign currency exchange rates are recognized in earnings upon the recognition of the change in the fair value of the hedged intercompany financings. The Company excludes the change in the fair value of these cross-currency swaps due to changes in interest rates from the assessment of hedge effectiveness. Changes in fair value of the swaps associated with changes in interest rates are initially recorded as a component of AOCI and recognized into other (income) expense, net in the Consolidated Statement of Operations using a systematic and rational method over the instrument’s term. The terms of the two cross-currency swaps designated as fair value hedges are as follows: • An amortizing cross-currency swap with an initial notional value of JPY 16.5 billion . The notional value is amortized by approximately JPY 1.4 billion every six months and matures on September 30, 2024. The Company receives interest in JPY on March 31 and September 30 of each year based on the JPY notional value and JPY Libor plus 2.00% . Interest payments are made in USD on March 31 and September 30 of each year based on the USD equivalent of the JPY notional value and USD Libor plus 2.70% . • A non-amortizing cross-currency swap with a notional value of JPY 16.5 billion maturing on September 30, 2024. The Company receives interest in JPY on March 31 and September 30 of each year based on the JPY notional value and JPY Libor plus 2.25% . Interest payments are made in USD on March 31 and September 30 of each year based on the USD equivalent of the JPY notional value and USD Libor plus 3.15% . The notional value of these contracts were JPY 31.6 billion or $279.7 million at March 31, 2019 . Hedges of Net Investments in Foreign Operations Strategy The Company entered into a cross-currency swap designated as a net investment hedge on November 7, 2018 to hedge the JPY currency exposure of the Company’s net investment in TOKIN. This agreement is a contract to exchange fixed-rate payments in one currency for fixed-rate payments in another currency. Changes in the fair value of this swap are recorded in equity as a component of AOCI in the same manner as foreign currency translation adjustments. In assessing the effectiveness of this hedge, the Company uses a method based on changes in spot rates to measure the impact of the foreign currency exchange rate fluctuations on both its foreign subsidiary net investment and the related swap. Under this method, changes in the fair value of the hedging instrument other than those due to changes in the spot rate are initially recorded in AOCI as a translation adjustment, and then are amortized into other (income) expense, net in the Consolidated Statement of Operations using a systematic and rational method over the instrument’s term. Changes in the fair value associated with the effective portion (i.e. those changes due to the spot rate) are recorded in AOCI as a translation adjustment and are released and recognized in earnings only upon the sale or liquidation of the hedged net investment. The terms of this cross-currency swap are as follows: • An amortizing cross-currency swap with an initial notional value of JPY 33.0 billion . The notional amount is amortized by approximately JPY 1.4 billion every six months and matures on September 30, 2024. Interest payments are made by the Company in JPY on March 31 and September 30 of each year based on the JPY notional value and a fixed rate of 2.61% . The Company receives interest in USD on March 31 and September 30 of each year based on the USD equivalent of the JPY notional value and a fixed rate of 6.25% . The notional value of this contract was JPY 31.6 billion or $279.7 million at March 31, 2019 . Cash Flow Hedging Strategy Certain operating expenses at the Company’s Mexican facilities are paid in Mexican Pesos. In order to hedge a portion of these forecasted cash flows, the Company purchases foreign exchange contracts, with terms generally less than twelve months, to buy Mexican Pesos for periods and amounts consistent with underlying cash flow exposures. These contracts are designated as cash flow hedges at inception. Unrealized gains and losses associated with the change in fair value of the foreign exchange contracts are recorded in AOCI. Changes in the derivatives’ fair values are deferred and recorded as a component of AOCI until the underlying transaction is settled and recorded to the Consolidated Statement of Operations. When the hedged item affects income, gains or losses are reclassified from AOCI to the Consolidated Statement of Operations as Cost of Sales for foreign exchange contracts to purchase such foreign currency. The notional value of outstanding Peso contracts was $74.3 million and $70.6 million as of March 31, 2019 and 2018 , respectively. Hedging Strategy Impact on Statements of Operations The following tables present gain and loss activity for the fiscal years ended March 31, 2019 , 2018 , and 2017 for derivative instruments designated as hedges (amounts in thousands): Fiscal Year Ended March 31, 2019 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ (6,383 ) $ (4,134 ) $ 6,034 Cross-currency swaps (2) Net Investment Other income/expense, net 5,009 4,230 — Foreign exchange contracts (3) Cash Flow Cost of sales (1,286 ) (698 ) — Fiscal Year Ended March 31, 2018 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ — $ — $ — Cross-currency swaps (2) Net Investment Other income/expense, net — — — Foreign exchange contracts (3) Cash Flow Cost of sales 667 2,420 — Fiscal Year Ended March 31, 2017 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ — $ — $ — Cross-currency swaps (2) Net Investment Other income/expense, net — — — Foreign exchange contracts (3) Cash Flow Cost of sales (1,896 ) (5,170 ) — ______________________________________________________________________________ (1) Amounts recognized in AOCI represent the change in the fair value of the derivative instruments related to the excluded components. Amounts reclassified from AOCI to income represent amortization of excluded components based upon the instruments' periodic coupons. Amounts recorded directly to income represent the change in the fair value of the derivative instruments related to the effective portion of the qualifying hedge. (2) Amounts recognized in AOCI represent the total change in the fair value of the derivative instrument. Amounts recorded to AOCI are recorded within foreign currency translation. Amounts reclassified from AOCI to income represent amortization of excluded components based on the instrument's periodic coupon. (3) Amounts recognized in AOCI represent the total change in the fair value of the derivative instruments. Amounts reclassified from AOCI to income represent the change in the fair value of the derivative instruments pertaining to the settlement of the qualifying hedged item (effective portion). The following tables present the total amount of each income and expense line item presented in the Consolidated Statements of Operations in which the results of fair value and cash flow hedges are recorded and the effects of those hedging strategies on income (amounts in thousands): Cost of sales Fiscal Year Ended March 31, 2019 2018 2017 Total income (expense) in Statements of Operations (1) $ (924,276 ) $ (860,744 ) $ (571,944 ) Cash flow hedging impact Foreign exchange contracts: Gain (loss) reclassified from AOCI to income (2) (698 ) 2,420 (5,170 ) Other income (expense), net Fiscal Year Ended March 31, 2019 2018 2017 Total income (expense) in Statements of Operations $ (11,214 ) $ (24,592 ) $ 3,871 Fair value hedging impact Cross-currency swaps: Gain (loss) on hedged item (6,034 ) — — Gain (loss) on derivative instrument (3) 1,900 — — _______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. (2) Net gains of $1.1 million are expected to be reclassified from AOCI into income within the next 12 months. (3) Amounts recognized in income include the change in the fair value of the derivative instruments related to the effective portion of the qualifying hedges and amortization of the excluded components.

Supplemental Balance Sheets and

Supplemental Balance Sheets and Statements of Operations Detail	12 Months Ended
	Mar. 31, 2019
Disclosure Text Block Supplement [Abstract]
Supplemental Balance Sheets and Statements of Operations Detail	Supplemental Balance Sheets and Statements of Operations Detail March 31, (amounts in thousands) 2019 2018 Accounts receivable: Trade $ 176,715 $ 166,459 Allowance for doubtful accounts reserve (1,206 ) (1,210 ) Ship-from-stock and debit (“SFSD”) reserve (18,862 ) (17,362 ) Returns reserves (1) (964 ) (131 ) Rebates reserves (967 ) (446 ) Price protection reserves (657 ) (420 ) Other — (329 ) Accounts receivable, net (1) $ 154,059 $ 146,561 _______________________________________________________________________________ (1) Fiscal year ended March 31, 2018 adjusted due to the adoption of ASC 606. The Company has agreements with distributors and certain other customers that, under certain conditions, allow for returns of overstocked inventory, provide protection against price reductions initiated by the Company and grant other sales allowances. Allowances for these commitments are included in the Consolidated Balance Sheets as reductions in trade accounts receivable. The Company adjusts sales based on historical experience. The following table presents the annual activities included in the allowance for these commitments (amounts in thousands): Balance at March 31, 2016 $ 22,978 Reduction in sales 87,739 Actual adjustments applied (90,365 ) Other 62 Balance at March 31, 2017 20,414 Reduction in sales 94,660 Actual adjustments applied (1) (95,444 ) Other 268 Balance at March 31, 2018 19,898 Reduction in sales 99,538 Actual adjustments applied (96,775 ) Other (5 ) Balance at March 31, 2019 $ 22,656 _______________________________________________________________________________ (1) Adjusted due to the adoption of ASC 606. March 31, (amounts in thousands) 2019 2018 Inventories: Raw materials and supplies $ 97,119 $ 88,408 Work in process 71,374 65,417 Finished goods 88,175 66,907 Inventory gross 256,668 220,732 Inventory reserves (15,539 ) (16,346 ) Inventory, net $ 241,129 $ 204,386 The following table presents the annual activities included in the inventory reserves (amounts in thousands): Balance at March 31, 2016 $ 16,101 Costs charged to expense 6,163 Write-offs (6,125 ) Other (198 ) Balance at March 31, 2017 15,941 Costs charged to expense 4,994 Write-offs (6,954 ) Other (1) 2,365 Balance at March 31, 2018 16,346 Costs charged to expense 6,019 Write-offs (6,826 ) Other — Balance at March 31, 2019 $ 15,539 _______________________________________________________________________________ (1) Includes $1.9 million in inventory reserves from TOKIN. Useful life (years) March 31, (amounts in thousands, except years) 2019 2018 Property, plant and equipment: Land and land improvements 20 $ 62,232 $ 66,150 Buildings 20 - 40 199,319 186,207 Machinery and equipment 10 916,737 895,914 Furniture and fixtures 4 - 10 82,306 72,811 Construction in progress 105,857 46,391 Other 9,280 4,457 Total property and equipment 1,375,731 1,271,930 Accumulated depreciation (880,451 ) (866,614 ) Property, plant and equipment, net $ 495,280 $ 405,316 March 31, (amounts in thousands) 2019 2018 Accrued expenses: Salaries, wages, and related employee costs $ 61,880 $ 62,778 Interest 211 396 Restructuring 1,869 8,719 Vacation 10,364 10,364 Anti-trust fines and settlements 9,517 33,696 Stock Returns (1) 2,539 2,485 Property, sales, and other taxes 1,854 1,571 Other (1) 5,527 5,110 Total accrued expenses (1) $ 93,761 $ 125,119 _______________________________________________________________________________ (1) March 31, 2018 adjusted due to the adoption of ASC 606. March 31, (amounts in thousands) 2019 2018 Other non-current obligations: Pension plans $ 82,717 $ 83,495 Employee separation liability 7,640 8,539 Deferred compensation 2,285 2,057 Customer deposits 3,689 3,800 Anti-trust fines and settlements 13,168 35,263 Uncertain tax positions 2,415 5,704 Deferred rent 5,366 3,840 Government subsidies 1,247 4,739 Deferred interest income-customer capacity agreements 2,142 — Restructuring 312 1,240 Other (1) 4,379 3,572 Total other non-current obligations (1) $ 125,360 $ 152,249 _______________________________________________________________________________ (1) March 31, 208 adjusted due to the adoption of ASC 606. Fiscal Years Ended March 31, (amounts in thousands) 2019 2018 2017 Other (income) expense, net: Net foreign exchange (gains) losses $ (7,230 ) $ 13,145 $ (3,758 ) Legal fines related to anti-trust class actions 6,701 9,900 — Post retirement and pension plan non-service costs 366 210 1,256 Insurance proceeds — — (423 ) Loss on early extinguishment of debt 15,946 486 — Grant (income) (4,559 ) (787 ) — Other (10 ) 1,638 (946 ) Total other (income) expense, net $ 11,214 $ 24,592 $ (3,871 )

Income_Loss Per Share

Income/Loss Per Share	12 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Income/Loss Per Share	Basic earnings per share calculation is based on the weighted-average number of common shares outstanding. Diluted earnings per share calculation is based on the weighted-average number of common shares outstanding adjusted by the number of additional shares that would have been outstanding had the potentially dilutive common shares been issued. Potentially dilutive shares of common stock include stock options and Platinum Warrant. The following table presents the basic and diluted weighted-average number of shares of common stock (amounts in thousands, except per share data): Fiscal Years Ended March 31, 2019 2018 2017 Numerator Net income (1) $ 206,587 $ 254,127 $ 47,157 Denominator: Weighted-average common shares outstanding: Basic 57,840 52,798 46,552 Assumed conversion of employee stock grants 1,242 2,291 2,235 Assumed conversion of warrants — 3,551 6,602 Diluted $ 59,082 $ 58,640 $ 55,389 Net income per basic share (1) $ 3.57 $ 4.81 $ 1.01 Net income per diluted share (1) $ 3.50 $ 4.33 $ 0.85 ______________________________________________________________________________ (1) Fiscal years ending March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. Common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been anti-dilutive, were as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Assumed conversion of employee stock grants — 71 771

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company leases office space for its headquarters in Fort Lauderdale, Florida under a 12 year lease agreement expiring in January 2030 . The annual rent expense under this agreement is $2.4 million , and allows for one renewal option for a five year term expiring in January 2035, exercisable at the option of the Company. The Company’s remaining operating leases are primarily for distribution facilities or sales and administrative offices that expire principally between 2019 and 2061. A number of leases require the Company to pay certain executory costs (taxes, insurance, and maintenance) and contain certain renewal and purchase options. Annual rental expenses for operating leases were included in results of operations and were $13.3 million , $10.7 million and $6.7 million in fiscal years 2019 , 2018 , and 2017 , respectively. Future minimum lease payments over the next five fiscal years and thereafter under non-cancellable operating leases at March 31, 2019 , are as follows (amounts in thousands): Fiscal Years Ended March 31, 2020 2021 2022 2023 2024 Thereafter Minimum lease payments $ 10,898 $ 8,536 $ 5,766 $ 5,322 $ 4,080 $ 13,709 Legal Update The Company or its subsidiaries are at any one-time parties to a number of lawsuits arising out of our respective operations, including workers’ compensation or work place safety cases, some of which involve claims of substantial damages. Although there can be no assurance, based upon information known to the Company, the Company does not believe that any liability which might result from an adverse determination of such lawsuits would have a material adverse effect on the Company’s financial condition or results of operations. As previously reported, KEMET and KEC, along with more than 20 other capacitor manufacturers and subsidiaries (including TOKIN, as described below), are defendants in a purported antitrust class action complaint, In re: Capacitors Antitrust Litigation , No. 3:14-cv-03264-JD, filed on December 4, 2014 with the United States District Court, Northern District of California (the “U.S. Class Action Complaint”). The complaint alleges a violation of Section 1 of the Sherman Act, for which it seeks injunctive and equitable relief and money damages. The complaint is currently nearing the end of the expert merits discovery phase. In addition, KEMET and KEC, along with more than 20 other capacitor manufacturers and subsidiaries, have been named as defendants in two suits by plaintiffs who have chosen not to participate in the U.S. Class Action Complaint (collectively with the U.S. Class Action Complaint, the “U.S. Complaints”): AASI Beneficiaries’ Trust v. AVX Corporation, et al. , filed on August 29, 2016 in the United States District Court, Southern District of Florida, and Benchmark Electronics, Inc., et al. v. AVX Corporation, et al. , filed on April 18, 2017 in the United States District Court, Southern District of Texas. The AASI and Benchmark complaints allege generally the same violations as the U.S. Class Action Complaint. In addition, as previously reported, KEMET and KEC, along with certain other capacitor manufacturers and subsidiaries (including TOKIN, as described below), were named as defendants in several additional suits that were filed in Canada (collectively, the “Canadian Complaints”): Badamshin v. Panasonic Corporation, et al. , filed August 6, 2014 in the Superior Court, Province of Quebec, District of Montreal; Herard v. Panasonic Corporation, et al. , filed August 6, 2014 in the Superior Court, Province of Quebec, District of Montreal; Cygnus Electronics Corporation v. Panasonic Corporation, et al. , filed August 6, 2014 in the Superior Court of Justice, Province of Ontario; LeClaire v. Panasonic Corporation, et al. , filed August 6, 2014 in the Superior Court, Province of Quebec, District of Montreal; Taylor v Panasonic Corporation, et al. , filed August 11, 2014 in the Superior Court of Justice, Province of Ontario; Ramsay v. Panasonic Corporation, et al. , filed August 14, 2014 in the Supreme Court, Province of British Columbia; Martin v. Panasonic Corporation, et al. , filed September 25, 2014 in the Superior Court, Province of Quebec, District of Montreal; Parikh v. Panasonic Corporation, et al. , filed October 3, 2014 in the Superior Court of Justice, Province of Ontario; Fraser v. Panasonic Corporation, et al. , filed October 3, 2014 in the Court of Queen’s Bench, Province of Saskatchewan; Pickering v. Panasonic Corporation, et al. , filed October 6, 2014 in the Supreme Court, Province of British Columbia; McPherson v Panasonic Corporation et al. , filed on November 6, 2014 in the Court of Queen’s Bench, Province of Manitoba; and Allott v AVX Corporation, et al. , filed on May 13, 2016 in the Superior Court of Justice, Province of Ontario. The Canadian Complaints generally allege the same unlawful acts as in the U.S. Complaints, assert claims under Canada’s Competition Act as well as various civil and common law causes of action, and seek injunctive and equitable relief and money damages. There have been no material updates to the proceedings described in the immediately preceding paragraph except that the claims against KEMET and KEC in Leclaire were dismissed on December 6, 2018. In addition, Parikh and Taylor have been stayed in favor of Cygnus, and Badamshin , Martin and Herard have been stayed in favor of LeClaire . Further, on November 18, 2018, the Ontario Supreme Court of Justice temporarily stayed Cygnus pending the outcome of a matter on appeal concerning class certification, and the Ramsay plaintiffs voluntarily suspended that proceeding until class certification for Cygnus has been determined. Except for the TOKIN accrual described below and certain attorneys’ fees, the Company has not recorded any accrual concerning the U.S. Complaints and the Canadian Complaints. TOKIN-Specific Legal Proceedings In July 2013, TOKIN was named as one of eight defendants in two purported U.S. class action antitrust lawsuits ( In Re: Lithium Ion Batteries Antitrust Litigation , 13-MD-02420-YGR, United States District Court, Northern District of California) (the “Battery Class Action Suits”) regarding the sale of lithium ion batteries brought on behalf of direct product purchasers and indirect product purchasers. On March 2, 2018, TOKIN entered into a settlement agreement, which, subject to court approval, provides for the release of TOKIN and its subsidiaries from claims asserted in the Battery Class Action Suits, in consideration of which, TOKIN agreed to pay $2.0 million to the settlement class of indirect product purchasers. TOKIN paid the settlement amount into an escrow account on January 25, 2019. On May 16, 2018, the Court granted final approval to a settlement agreement by which, in consideration of the release of TOKIN and its subsidiaries from claims asserted in the Battery Class Action Suits, TOKIN agreed to pay $4.95 million to the settlement class of direct product purchasers. Prior to final court approval, TOKIN had paid the settlement amount into an escrow account on January 18, 2018. Beginning in March 2014, TOKIN and certain of its subsidiaries received inquiries, requests for information and other communications from government authorities in China, the United States, the European Commission, Japan, South Korea, Taiwan, Singapore, and Brazil concerning alleged anti-competitive activities within the capacitor industry. On September 2, 2015, the United States Department of Justice announced a plea agreement with TOKIN in which TOKIN agreed to plead guilty to a one-count felony charge of unreasonable restraint of interstate and foreign trade and commerce in violation of Section 1 of the Sherman Act, and to pay a criminal fine of $13.8 million . The plea agreement was approved by the United States District Court, Northern District of California, on January 21, 2016. The fine is payable over 5 years in six installments of $2.3 million each, plus accrued interest. The first four payments were made in February 2016, January 2017, January 2018, and January 2019, while the next payment is due in January 2020. On December 9, 2015, the Taiwan Fair Trade Commission (“TFTC”) publicly announced that TOKIN would be fined 1.2 billion New Taiwan dollars (“NTD”) (approximately $39.5 million ) for violations of the Taiwan Fair Trade Act. Subsequently, the TFTC indicated the fine would be reduced to NTD 609.1 million (approximately $19.8 million ). In February 2016, TOKIN commenced an administrative suit in Taiwan, challenging the validity of the amount of the fine. On August 23, 2018, the Taipei High Administrative Court revoked the TFTC decision, finding that the decision had been time-barred by applicable statute. On September 21, 2018, the TFTC filed an appeal against the High Administrative Court's decision. Payment of the TFTC fine is not stayed during the administrative appeals; TOKIN has made installment payments of the fine aggregating to approximately NTD 152.3 million (approximately $4.9 million ) as of March 31, 2019. On March 29, 2016, the Japan Fair Trade Commission published an order by which TOKIN was fined JPY 127.2 million (approximately U.S. $1.1 million ) for violation of the Japanese Antimonopoly Act. Payment of the fine was made on October 31, 2016. On July 15, 2016, TOKIN entered into definitive settlement agreements in two antitrust suits filed with the United States District Court, Northern District of California as In re: Capacitors Antitrust Litigation , No. 3:14-cv-03264-JD (the “Capacitor Class Action Suits”). Pursuant to the terms of the settlement, in consideration of the release of TOKIN and its subsidiaries (including TOKIN America, Inc.) from claims asserted in the Capacitor Class Action Suits, TOKIN will pay an aggregate $37.3 million to a settlement class of direct purchasers of capacitors and a settlement class of indirect purchasers of capacitors. Each of the respective class payments is payable in five installments, four of which were paid on or before the respective due dates of July 29, 2016, May 15, 2017, May 15, 2018, and May 15, 2019. The final payment is due by December 31, 2019. On July 27, 2016, Brazil’s Administrative Council for Economic Defense approved a cease and desist agreement with TOKIN in which TOKIN made a financial contribution of Brazilian Real 0.6 million (approximately $0.2 million ) to Brazil’s Fund for Defense of Diffuse Rights. On March 21, 2018, the European Commission announced a decision by which TOKIN was fined EUR 8.8 million directly (approximately $10.3 million ) and EUR 5.0 million (approximately $5.9 million ) jointly and severally with NEC Corporation, for violation of the competition laws of the European Union. Payment of the fines were made on June 28, 2018. On June 4, 2018, TOKIN filed an appeal with the General Court of the European Union, seeking annulment and/or reduction of the fines. As noted above, TOKIN, along with KEMET and certain of its other subsidiaries, were named as defendants in the Canadian Complaints. On May 30, 2018, TOKIN entered into definitive settlement agreement with the plaintiffs in the Canadian Complaints Pursuant to the terms of the settlement, in consideration of the release of TOKIN and its subsidiaries (including TOKIN America, Inc.) from claims asserted in the Canadian Complaints, TOKIN paid CAD 2.9 million (approximately $2.2 million ) to a settlement class of purchasers of aluminum and tantalum electrolytic capacitors and purchasers of products containing such capacitors. The settlement payment was made on June 27, 2018. The settlement agreement has been approved by the Quebec and Ontario courts; approval by the Supreme Court of British Columbia is pending. On November 30, 2018, the Korean Fair Trade Commission (“KFTC”) notified TOKIN of its decision to impose an administrative fine on TOKIN of KRW 8.1 billion (approximately $7.2 million ) for violation of South Korea's Monopoly Regulation and Fair Trade Law. TOKIN filed its appeal of the KFTC's decision with the Seoul High Court on December 28, 2018. Payment of the fine is not stayed during appeal; TOKIN paid the full fine amount on February 1, 2019. On July 2, 2018, TOKIN and TOKIN America Inc. were named as two of 20 defendants in a purported U.S. class action antitrust lawsuit, In re: Inductors Antitrust Litigation , No. 5:18-cv-00198-EJD-NC, filed in the United States District Court, Northern District of California, regarding the sale of inductors brought on behalf of direct product purchasers and indirect product purchasers. The complaint alleges violations of Sections 1 and 3 of the Sherman Act, for which it seeks injunctive and equitable relief and money damages. As of March 31, 2019 , TOKIN’s accrual for antitrust and civil litigation claims totaled $37.7 million which is stated in the following line items, “Account payable” ( $15.0 million ), “Accrued expenses” ( $9.5 million ) and “Other non-current obligations” ( $13.2 million ) on the Consolidated Balance Sheets. This amount includes the best estimate of losses which may result from the ongoing antitrust investigations, civil litigation and claims. However, the actual outcomes could differ from what has been accrued. Additionally, under the terms of the TOKIN Purchase Agreement, KEMET will be responsible for defending all suits brought against TOKIN, paying all expenses and satisfying all judgments to the extent incurred by or rendered against TOKIN arising out of or related the capacitor antitrust investigations and related litigation described above.

Quarterly Results of Operations

Quarterly Results of Operations (Unaudited)	12 Months Ended
	Mar. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results of Operations (Unaudited)	Quarterly Results of Operations (Unaudited) The following table sets forth certain quarterly information for fiscal years 2019 and 2018 . This information, in the opinion of the Company’s management, reflects all adjustments (consisting only of normal recurring adjustments) necessary to present fairly this information when read in conjunction with the Consolidated Financial Statements and notes thereto included elsewhere herein (amounts in thousands except per share data): Fiscal Year 2019 Quarters Ended Jun-30 Sep-30 Dec-31 Mar-31 Net sales $ 327,616 $ 349,233 $ 350,175 $ 355,794 Gross margin 94,821 113,565 123,750 126,406 Operating income (1) 35,176 50,000 61,616 54,057 Net income $ 35,220 $ 37,141 $ 40,806 $ 93,420 Net income per basic share $ 0.61 $ 0.64 $ 0.70 $ 1.60 Net income per diluted share $ 0.60 $ 0.63 $ 0.69 $ 1.58 Fiscal Year 2018 Quarters Ended Jun-30 Sep-30 Dec-31 Mar-31 Net sales (2) $ 273,946 $ 301,568 $ 306,576 $ 318,091 Gross margin (2) 74,117 84,904 92,288 88,128 Operating income (1) (2) 27,607 31,597 32,002 21,646 Net income (2) $ 220,439 $ 12,819 $ 18,589 $ 2,280 Net income per basic share (2) $ 4.65 $ 0.26 $ 0.33 $ 0.04 Net income per diluted share (2) $ 3.82 $ 0.22 $ 0.32 $ 0.04 ___________________________________________ (1) Operating income (loss) as a percentage of net sales fluctuates from quarter to quarter due to a number of factors, including net sales fluctuations, foreign currency exchange, restructuring charges, product mix, the timing and expense of moving product lines to lower-cost locations, the write-down of long lived assets, the net gain/loss on sales and disposals of assets and the relative mix of sales among distributors, original equipment manufacturers, and electronic manufacturing service providers. (2) Fiscal year 2018 figures adjusted due to the adoption of ASC 606.

Subsequent Events

Subsequent Events	12 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events

Organization and Significant _2

Organization and Significant Accounting Policies (Policies)	12 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Nature of Business and Organization	Nature of Business and Organization KEMET Corporation, which together with its subsidiaries is referred to herein as “KEMET” or the “Company” is a leading manufacturer of tantalum capacitors, multilayer ceramic capacitors, film capacitors, electrolytic capacitors, paper capacitors and solid aluminum capacitors, and Electro-Magnetic Compatible ("EMC") devices, sensors, and actuators. The Company is headquartered in Fort Lauderdale, Florida and has manufacturing plants and distribution centers located in the United States, Mexico, Europe and Asia. Additionally, the Company has wholly-owned foreign subsidiaries which primarily provide sales support for KEMET’s products in foreign markets. KEMET is organized into three reportable segments: the Solid Capacitor Reportable Segment (“Solid Capacitors”), the Film and Electrolytic Reportable Segment (“Film and Electrolytic”) and the Electro-Magnetic, Sensors, and Actuators Reportable Segment ("MSA"). Each reportable segment is responsible for the operations of certain manufacturing sites as well as related research and development efforts.
Basis of Presentation	Basis of Presentation Certain amounts for the Consolidated Statements of Operations for fiscal years 2018 and 2017 have been revised to conform with the fiscal year 2019 presentation.
Principles of Consolidation	Principles of Consolidation The accompanying Consolidated Financial Statements of the Company include the accounts of its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. Investment in entities in which the Company can exercise significant influence, but does not own a majority equity interest or otherwise control, are accounted for using the equity method and are included as equity method investments on the consolidated balance sheets.
Cash Equivalents	Cash Equivalents Cash equivalents of $60.7 million and $83.9 million at March 31, 2019 and 2018 , respectively, consist of money market accounts and certificates of deposits with original terms of three months or less. The Company considers all liquid debt instruments with original maturities of three months or less to be cash equivalents.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value. The Company maintains reserves for excess and slow-moving inventory to reflect a carrying amount for inventory that is stated at the lower of cost or net realizable value. The inventory reserve is an estimate and is adjusted based on slow moving and excess inventory, historical shipments, customer forecasts and backlog, and technology developments. Raw materials and tool crib obsolescence reserves are based on usage over one and two years, respectively, and the Company maintains reserves for raw materials and tool cribs that exceed these ages. Finished goods obsolescence reserves are either based on product age limits determined by market requirements, and/or based on excess quantities that exceed product orders and historical product sales. Inventory costs include material, labor and manufacturing overhead and most inventory costs are determined by the “first-in, first-out” (“FIFO”) method. For tool crib, a component of the Company’s raw material inventory, cost is determined under the average cost method. The Company has consigned inventory at certain customer locations totaling $9.5 million and $8.1 million at March 31, 2019 and 2018 , respectively.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant, and equipment are stated at cost. Depreciation is calculated principally using the straight-line method over the estimated useful lives of the respective assets. Leasehold improvements are amortized using the straight-line method over the shorter of the estimated useful lives of the assets or the terms of the respective leases. Maintenance costs are expensed and expenditures for renewals and improvements are generally capitalized. Upon sale or retirement of property and equipment, the related cost and accumulated depreciation are removed, and any gain or loss is recognized. A long-lived asset classified as held for sale is initially measured and reported at the lower of its carrying amount or fair value less cost to sell. Long-lived assets to be disposed of other than by sale are classified as held and used until the long-lived asset is disposed of. Depreciation expense, including amortization of capital leases, was $46.7 million , $45.5 million and $35.0 million for the fiscal years ended March 31, 2019 , 2018 and 2017 , respectively. The Company evaluates long-lived assets for impairment whenever certain events or changes in circumstances may indicate that the recoverability of the carrying amount of property, plant, and equipment should be assessed, including, among others, a significant decrease in market value, a significant change in the business climate in a particular market, or a current period operating or cash flow loss combined with historical losses or projected future losses. Reviews are regularly performed to determine whether facts and circumstances exist which indicate the carrying amount of assets may not be recoverable. If any impairment indicators are determined to exist, the Company assesses the recoverability of its assets by comparing the projected undiscounted net cash flows associated with the related asset or group of assets over their remaining lives against their respective carrying amounts. If it is determined that the book value of a long-lived asset or asset group is not recoverable, an impairment loss would be calculated equal to the excess of the carrying amount of the long-lived asset over its fair value. The Company must make certain assumptions as to the future cash flows to be generated by the underlying assets. Those assumptions include the amount of volume increases, average selling price decreases, anticipated cost reductions, and the estimated remaining useful life of the equipment. Future changes in assumptions may negatively impact future valuations. Fair market value is based on the discounted cash flows that the assets will generate over their remaining useful lives or other valuation techniques. See Note 8 , “(Gain) loss on write down and disposal of long-lived assets” for further discussion of property, plant and equipment impairment charges.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill and other intangible assets with indefinite useful lives are not amortized but are subject to annual impairment tests during the fourth quarter of each fiscal year and when otherwise warranted. The Company evaluates its goodwill on a reporting unit basis, which requires the Company to estimate the fair value of the reporting unit. The impairment test involves a comparison of the fair value of each reporting unit, with the corresponding carrying amounts. If the reporting unit’s carrying amount exceeds its fair value, then an indication exists that the reporting unit’s goodwill and intangible assets with indefinite useful lives may be impaired. The impairment to be recognized is measured by the amount by which the carrying value of the reporting unit’s goodwill being measured exceeds its implied fair value. The implied fair value of goodwill is the excess of the fair value of the reporting unit over the sum of the amounts assigned to identified net assets. As a result, the implied fair value of goodwill is generally the residual amount that results from subtracting the value of net assets, including all tangible assets and identified intangible assets, of the reporting unit’s fair value. The Company determines the fair value of its reporting units using an income-based, discounted cash flow (“DCF”) analysis, and market-based approaches (Guideline Publicly Traded Company Method and Guideline Transaction Method) which examine transactions in the marketplace involving the sale of the stocks of similar publicly owned companies, or the sale of entire companies engaged in operations similar to KEMET. The Company evaluates the value of its other indefinite-lived intangible assets (trademarks) using an income-based, relief from royalty analysis. In addition to the previously described reporting unit valuation techniques, the Company’s goodwill and intangible assets with indefinite useful lives impairment assessment also considers the Company’s aggregate fair value based upon the value of the Company’s outstanding shares of common stock. The impairment review of goodwill and intangible assets with indefinite useful lives are subjective and involve the use of estimates and assumptions. Estimates of business enterprise fair value use discounted cash flow and other fair value appraisal models and involve making assumptions for future sales trends, market conditions, growth rates, cost reduction initiatives and cash flows for the next several years. Future changes in assumptions may negatively impact future valuations.
Equity Method Investment	Equity Method Investments Investments and ownership interests are accounted for under the equity method of accounting if the Company has the ability to exercise significant influence, but not control, over the entity. Investments accounted for under the equity method are initially recorded at cost, and the difference between the basis of the Company’s investment and the underlying equity in the net assets of the company at the investment date, is amortized over the lives of the related assets that gave rise to the difference. The Company’s share of earnings or losses under the equity method investments and basis difference amortization is reported in the consolidated statements of operations as “Equity income (loss) from equity method investments.” The Company reviews its investments and ownership interests accounted for under the equity method of accounting for impairment whenever events or changes in circumstances indicate a loss in the value of the investment may be other than temporary.
Deferred Income Taxes	Deferred Income Taxes The Company accounts for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the fiscal years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date. The Company periodically evaluates its net deferred tax assets based on an assessment of historical performance, ability to forecast future events, and the likelihood that the Company will realize the benefits through future taxable income. Valuation allowances are recorded to reduce the net deferred tax assets to the amount that is more likely than not to be realized. The Company makes certain estimates and judgments in the calculation for the provision for income taxes, in the resulting tax liabilities, and in the recoverability of deferred tax assets. All deferred tax assets are reported as noncurrent in the Consolidated Balance Sheets.
Stock-based Compensation	Stock-based Compensation Stock-based compensation for stock options is estimated on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes model considers volatility in the price of the Company’s stock, the risk-free interest rate, the estimated life of the equity-based award, the closing market price of the Company’s stock on the grant date and the exercise price. The estimates utilized in the Black-Scholes calculation involve inherent uncertainties and the application of management judgment. The Company's stock options were fully expensed during the fiscal year ended March 31, 2017. Upon adoption of Accounting Standard Update (“ASU”) No. 2016-09, Compensation Stock-Compensation, the Company elected to discontinue estimating forfeitures. Stock-based compensation cost for restricted stock is measured based on the closing fair market value of the Company’s common stock on the date of grant. The Company recognizes stock-based compensation cost for arrangements with cliff vesting as expense ratably on a straight-line basis over the requisite service period. The Company recognizes stock-based compensation cost for arrangements with graded vesting as expense on an accelerated basis over the requisite service period.
Concentrations of Credit and Other Risks	Concentrations of Credit and Other Risks The Company sells to customers globally. Credit evaluations of its customers’ financial condition are performed periodically, and the Company generally does not require collateral from its customers. There were no customers’ accounts receivable balances exceeding 10% of gross accounts receivable at March 31, 2019 or March 31, 2018 . Consistent with industry practice, the Company utilizes electronics distributors for a large percentage of its sales. Electronics distributors are an effective means to distribute the products to end-users. For fiscal years ended March 31, 2019 , 2018 , and 2017 , net sales to electronics distributors accounted for 42.2% , 39.2% and 46.8% , respectively, of the Company’s total net sales.
Foreign Subsidiaries	Foreign Subsidiaries The Company translates the assets and liabilities of its foreign subsidiaries from their respective functional currencies to U.S. dollars at the appropriate spot rates as of the balance sheet date. Generally, our foreign subsidiaries use the local currency as their functional currency. Changes in the carrying value of these assets and liabilities attributable to fluctuations in spot rates are recognized as a component of equity in accumulated other comprehensive income ("AOCI"). Results of operations accounts are translated using average exchange rates for the year. Assets and liabilities denominated in a currency that is different from a reporting entity's functional currency must first be remeasured from the applicable currency to the legal entity's functional currency. The effect of this remeasurement process is recognized in the Consolidated Statements of Operations.
Comprehensive Income (Loss)	Comprehensive Income (Loss) Comprehensive income (loss) consists of net income, foreign currency translation gains (losses), post-retirement and defined benefit plan adjustments including those adjustments which result from changes in net prior service credit and actuarial gains (losses), equity interest in investee’s other comprehensive income (loss), gains (losses) on foreign exchange contracts, and gains (losses) on the excluded component of fair value hedges. Comprehensive income is presented in the Consolidated Statements of Comprehensive Income (Loss).
Stock Warrant
Fair Value Measurement	Fair Value Measurement The Company utilizes three levels of inputs to measure the fair value of (a) nonfinancial assets and liabilities that are recognized or disclosed at fair value in the Company’s consolidated financial statements on a recurring basis (at least annually) and (b) all financial assets and liabilities. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The first two inputs are considered observable and the last is considered unobservable. The levels of inputs are as follows: • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.
Revenue Recognition	Revenue Recognition The Company recognizes revenue under the guidance provided in ASC 606. Consistent with the terms of ASC 606, the Company records revenue on product sales in the period in which the Company satisfies its performance obligation by transferring control over a product to a customer. The amount of revenue recognized reflects the consideration the Company expects to receive in exchange for transferring products to a customer. The Company has elected the practical expedient under ASC 606-10-32-18 and does not consider the effects of a financing component on the promised amount of consideration because the period between when the Company transfers a product to a customer and when the customer pays for that product is one year or less. As performance obligations are expected to be fulfilled in one year or less, the Company has elected the practical expedient under ASC 606-10-50-14 and has not disclosed information relating to remaining performance obligations. The Company sells its products to distributors, original equipment manufacturers (“OEM”), and electronic manufacturing services providers (“EMS”), and the sales price may include adjustments for sales discounts, price adjustments, and sales allowances. The Company has elected the practical expedient under ASC 606-10-10-4 and evaluates these sales-related adjustments on a portfolio basis. The principle forms of these adjustments include: • Inventory price protection and ship-from stock and debit (“SFSD”) programs, • Distributor rights of returns, • Sales allowances, and • Limited assurance warranties The Company's inventory price protection and SFSD programs provide authorized distributors with the flexibility to meet marketplace prices by allowing them, upon a pre-approved case-by-case basis, to adjust their purchased inventory cost to correspond with current market demand. KEMET's SFSD program is specific to certain distributors within the Americas and EMEA regions. Requests for SFSD adjustments are considered on an individual basis, require a pre-approved cost adjustment quote from their local KEMET sales representative, and apply only to a specific customer, part, specified special price amount, specified quantity, and are only valid for a specific period of time. To estimate potential SFSD adjustments corresponding with current period sales, KEMET records a sales reserve based on historical SFSD credits, distributor inventory levels, and certain accounting assumptions, all of which are reviewed quarterly. Select distributors have the right to return a certain portion of their purchased inventory to KEMET from the previous fiscal quarter. The Company estimates future returns based on historical return patterns and records a corresponding right of return asset and refund liability as a component of the line items, “Inventories, net” and “Accrued expenses,” respectively, on the Condensed Consolidated Balance Sheets. The Company also offers volume-based rebates on a case-by-case basis to certain customers in each of the Company’s sales channels. The Company's sales allowances are recognized as a reduction in the line item “Net sales” on the Consolidated Statements of Operations, while the associated reserves are included in the line item “Accounts receivable, net” on the Consolidated Balance Sheets. Estimates used in determining sales allowances are subject to various factors. This includes, but is not limited to, changes in economic conditions, pricing changes, product demand, inventory levels in the supply chain, the effects of technological change, and other variables that might result in changes to the Company’s estimates. The Company provides a limited assurance warranty on products that meet certain specifications to select customers. The warranty coverage period is generally limited to one year for United States based customers and a length of time commensurate with regulatory requirements or industry practice outside the United States. A warranty cannot be purchased by the customer separately and, as a result, product warranties are not considered to be separate performance obligations. The Company’s liability under these warranties is generally limited to a replacement of the product or refund of the purchase price of the product. The Company recognizes warranty costs when losses are both probable and reasonably estimable. Warranty costs were not material for the fiscal years ended March 31, 2019 , 2018 and 2017 . Disaggregation of Revenue Refer to Note 7 , “ Reportable Segment and Geographic Information” for revenue disaggregated by primary geographical market, sales channel, and major product line. Contract liabilities Contract liabilities consist of advance payments from certain customers within the OEM channel for the development of additional production capacity. The current and noncurrent portions of these liabilities are included as a component of the line items, “Accrued expenses” and “Other non-current obligations,” respectively, on the Consolidated Balance Sheets. The balance of net contract liabilities consisted of the following at March 31, 2019 and 2018 (amounts in thousands): March 31, 2019 March 31, 2018 Contract liabilities - current (Accrued expenses) $ 256 $ 256 Contract liabilities - noncurrent (Other non-current obligations) — 513 Total contract liabilities $ 256 $ 769 For the fiscal years ended March 31, 2019 , 2018 and 2017 , the Company recognized revenue of $0.9 million , $0.3 million , and $0.2 million , respectively, related to contract liabilities. Revenue related to contract liabilities is recorded on the Consolidated Statements of Operations in the line item, "Net sales." Contract assets The Company recognizes an asset from the costs incurred to fulfill a contract if those costs directly relate to an existing or anticipated contract or specific business opportunity, if the costs enhance our own resources that will be used in satisfying performance obligations in the future, and the costs are expected to be recovered through subsequent sale of product to the customer. The Company has determined that certain direct labor, materials, and allocations of overhead incurred within research and development activities meet the requirements to be capitalized. As most of our contracts and customer specific business opportunities do not include a stated term, the Company amortizes these capitalized costs over the expected product life cycle, which is consistent with the estimated transfer of goods to the customer. Capitalized contract costs were $1.6 million and $2.2 million at March 31, 2019 and 2018 , respectively. Capitalized contracts costs are recorded on the Consolidated Balance Sheets in the line item, “Other assets.” Amortization expense related to contract costs for the fiscal years ended March 31, 2019 , 2018 and 2017 was $0.8 million , $0.9 million , and $0.8 million , respectively. There was no impairment loss in relation to the costs capitalized for the fiscal years ended March 31, 2019 , 2018 and 2017 . Amortization expense related to contract assets is recorded on the Consolidated Statements of Operations line item "Cost of sales."
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The Company evaluates the collectability of trade receivables through the analysis of customer accounts. When the Company becomes aware that a specific customer has filed for bankruptcy, has begun closing or liquidation proceedings, has become insolvent or is in financial distress, the Company records a specific allowance for the doubtful account to reduce the related receivable to the amount the Company believes is collectible. If circumstances related to specific customers change, the Company’s estimates of the recoverability of receivables could be adjusted. Accounts are written off after all means of collection, including legal action, have been exhausted.
Shipping and Handling Costs	Shipping and Handling Costs The Company’s shipping and handling costs are reflected in the line item “Cost of sales,” on the Consolidated Statements of Operations. Shipping and handling costs were $31.0 million , $21.4 million , and $16.4 million in the fiscal years ended March 31, 2019 , 2018 and 2017 , respectively.
Income (Loss) per Share	Income per Share Basic income per share is computed using the weighted-average number of shares outstanding. Diluted income per share is computed using the weighted-average number of shares outstanding adjusted for the incremental shares attributed to the warrant issued in May 2009 to K Financing, LLC by the Company (the “Platinum Warrant”) and outstanding employee stock grants if such effects are dilutive.
Grants from Governmental Agencies	Grants Income The Company from time to time enters into contracts to perform projects in which governmental agencies agree to reimburse the Company for certain expenses incurred on the projects. The Company recognizes revenue from government grants when it is probable that the Company will comply with the conditions attached to the grant agreement and the grant proceeds will be received. Additionally, from time to time the Company receives interest free loans from governmental agencies in consideration of the Company making investments in operations in certain locations. As the loans are interest free, the Company records deferred grant income for the difference between the gross loan proceeds and the present value of the debt at the time it is issued. The deferred grant income is amortized over the life of the loans. During the fiscal years ended March 31, 2019 and 2018 , the Company recognized $4.6 million and $0.8 million , respectively, as grant income within other (income) expense, net.
Environmental Cost	Environmental Cost The Company recognizes liabilities for environmental remediation when it is probable that a liability has been incurred and can be reasonably estimated. The Company determines its liability on a site-by-site basis, and it is not discounted or reduced for anticipated recoveries from insurance carriers. In the event of anticipated insurance recoveries, such amounts would be presented on a gross basis in other current or non-current assets, as appropriate. Expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized.
Derivative Financial Instruments	Derivative Financial Instruments The Company, when deemed appropriate, uses derivatives as a risk management tool to mitigate the potential impact of certain market risks. The primary market risk managed by the Company through the use of derivative financial instruments is foreign currency exchange risk. All derivatives are carried at fair value in our Consolidated Balance Sheets. See Note 12 , " Derivatives," for further discussion of derivative financial instruments.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. generally accepted accounting principles (“GAAP”) requires management to make a number of estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. In addition, they affect the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include impairment of property and equipment, intangibles and goodwill, allowances for doubtful accounts, price protection and customers’ returns, deferred income taxes, and assets and obligations related to employee benefits. Actual results could differ from these estimates and assumptions.
Impact of Recently Issued Accounting Standards	Impact of Recently Issued Accounting Standards In August 2018, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2018-15, Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract. This ASU amends the definition of a hosting arrangement and requires a customer in a hosting arrangement that is a service contract to capitalize certain implementation costs as if the arrangement was an internal-use software project. Under this ASU, a customer will apply ASC 350-40 to determine whether to capitalize implementation costs of the cloud computing arrangement that is a service contract or expense them as incurred. This ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this guidance on the Company’s Consolidated Financial Statements. In March 2018, the FASB issued ASU No. 2018-05, Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin (“SAB”) No. 118. The amendments in this update provide guidance on when to record and disclose provisional amounts for certain income tax effects of the Tax Cuts and Jobs Act (the “Act”). The amendments also require any provisional amounts or subsequent adjustments to be included in net income from continuing operations. Additionally, this ASU discusses required disclosures that an entity must make with regard to the Act. This ASU is effective immediately as new information is available to adjust provisional amounts that were previously recorded. The Company has adopted this ASU and has finalized its accounting for the Act. See Note 11 , “ Income Taxes” for additional information on the Act. In August 2017, the FASB issued ASU No. 2017-12, Targeted Improvements to Accounting for Hedging Activities (“ASU 2017-12”). This ASU amends and simplifies existing guidance to allow companies to more accurately present the economic effects of risk management activities in the financial statements. For cash flow hedges existing on the date of adoption, an entity is required to eliminate the separate measurement of ineffectiveness in earnings by means of a cumulative-effect adjustment to accumulated other comprehensive income (“AOCI”) with a corresponding adjustment to the opening balance of retained earnings. ASU 2017-12 becomes effective for fiscal years and interim periods beginning after December 15, 2018 and early adoption is permitted. In the third quarter of fiscal year 2019, the Company entered into new derivative contracts and elected to early adopt the ASU effective as of October 1, 2018. The adoption of the standard did not result in a cumulative-effect adjustment since the Company has not previously had any ineffectiveness associated with its cash flows hedges. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230) Classification of Certain Cash Receipts and Cash Payments. This ASU clarifies how cash receipts and cash payments in certain transactions are presented and classified in the statement of cash flows. The effective date of this update is for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2017, with early adoption permitted. The update requires retrospective application to all periods presented but may be applied prospectively if retrospective application is impracticable. The Company adopted this guidance as of April 1, 2018. In connection with the adoption of this ASU, the Company elected to account for distributions received from equity method investees using the nature of distributions approach, under which distributions are classified based on the nature of activity that generated them. The other provisions of this ASU did not have an impact on the Company's Condensed Consolidated Cash Flows. In February 2016, the FASB issued ASU No. 2016-02 (“ASU 2016-02”), Leases, as modified by ASU 2017-03, Transition and Open Effective Date Information, requiring lessees to recognize a right-of-use asset and a lease liability for all leases. This ASU also requires expanded disclosures to help financial statement users better understand the amount, timing, and uncertainty of cash flows arising from leases. The standard is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years and the Company will adopt ASU 2016-02 on April 1, 2019. The Company has substantially completed its preparation for the adoption of this ASU, and the ASU is expected to have a material impact on lease assets and lease liabilities on its Consolidated Balance Sheets upon adoption. This ASU is not expected to have a material effect on the amount of expense recognized in connection with the Company's current practice. The Company plans to elect the optional transition method that will give companies the option to use the effective date as the date of initial application on transition, and as a result, we will not adjust our comparative period financial information or make the new required lease disclosures for periods before the effective date. For information about the Company's future lease commitments as of March 31, 2019, see Note 15 , " Commitments and Contingencies. " In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which superseded existing GAAP for revenue recognition and created a single framework. ASU 2014-09 and its amendments were included primarily in ASC 606. The core principle of ASC 606 is that an entity should recognize revenue for the transfer of goods or services equal to an amount that it expects to be entitled to receive for those goods or services. ASC 606 also requires additional disclosures about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments. The Company adopted the requirements of ASC 606 effective in the first quarter of fiscal year 2019, using the full retrospective method, which required us to restate each prior reporting period presented. The Company has applied practical expedient ASC 606-10-65-1(f)(3) and notes that all previously reported historical amounts are adjusted for the impact of ASC 606. Adoption of the requirements in ASC 606 impacted our previously reported Consolidated Balance Sheet as of March 31, 2018 and our Consolidated Statements of Operations, Statements of Comprehensive Income, Statements of Changes in Stockholders' Equity, and Statements of Cash Flows for the fiscal years ended March 31, 2018 and 2017 as follows (amounts in thousands, except per share data): Consolidated Balance Sheet As of March 31, 2018 As Previously Reported ASC 606 Adjustments As Adjusted Assets Account receivable, net $ 144,076 $ 2,485 $ 146,561 Total current assets 676,468 2,485 678,953 Other assets 10,431 2,169 12,600 Total assets $ 1,218,269 $ 4,654 $ 1,222,923 Liabilities and Stockholders' Equity Accrued expenses $ 122,377 $ 2,742 $ 125,119 Total current liabilities 284,916 2,742 287,658 Deferred income taxes 14,571 487 15,058 Other non-current obligations 151,736 513 152,249 Total liabilities 755,306 3,742 759,048 Retained earnings (deficit) 2,675 695 3,370 Accumulated other comprehensive income (3,015 ) 217 (2,798 ) Total stockholders' equity 462,963 912 463,875 Total liabilities and stockholders' equity $ 1,218,269 $ 4,654 $ 1,222,923 Consolidated Statements of Operations Fiscal Year 2018 As Previously Reported ASC 606 Adjustments As Adjusted Net sales $ 1,199,926 $ 255 $ 1,200,181 Operating costs and expenses: Cost of sales 859,533 1,211 860,744 Research and development 39,619 (505 ) 39,114 Operating income 113,303 (451 ) 112,852 Income tax expense 9,181 (49 ) 9,132 Net income $ 254,529 $ (402 ) $ 254,127 Net income per basic share $ 4.82 $ (0.01 ) $ 4.81 Net income per diluted share $ 4.34 $ (0.01 ) $ 4.33 Fiscal Year 2017 As Previously Reported ASC 606 Adjustments As Adjusted Net sales $ 757,791 $ (453 ) $ 757,338 Operating costs and expenses: Cost of sales 570,864 1,080 571,944 Research and development 27,398 (705 ) 26,693 Operating income 35,796 (828 ) 34,968 Income tax expense 4,290 4 4,294 Net income $ 47,989 $ (832 ) $ 47,157 Net income per basic share $ 1.03 $ (0.02 ) $ 1.01 Net income per diluted share $ 0.87 $ (0.02 ) $ 0.85 Consolidated Statements of Comprehensive Income Fiscal Year 2018 As Previously Reported ASC 606 Adjustments As Adjusted Net income $ 254,529 $ (402 ) $ 254,127 Foreign currency translation gains (losses) 35,054 217 35,271 Other comprehensive income 38,797 217 39,014 Total comprehensive income $ 293,326 $ (185 ) $ 293,141 Fiscal Year 2017 As Previously Reported ASC 606 Adjustments As Adjusted Net income $ 47,989 $ (832 ) $ 47,157 Total comprehensive income $ 37,602 $ (832 ) $ 36,770 Consolidated Statements of Changes in Stockholders' Equity As of and for the Fiscal Year Ended March 31, 2018 As Previously Reported ASC 606 Adjustments As Adjusted Net income $ 254,529 $ (402 ) $ 254,127 Retained earnings 2,675 695 3,370 Other comprehensive income 38,797 217 39,014 Accumulated other comprehensive income (loss) (3,015 ) 217 (2,798 ) Total stockholders' equity $ 462,963 $ 912 $ 463,875 As of and for the Fiscal Year Ended March 31, 2017 As Previously Reported ASC 606 Adjustments As Adjusted Net income $ 47,989 $ (832 ) $ 47,157 Adoption of ASU's (333 ) 1,929 1,596 Retained earnings (251,854 ) 1,097 (250,757 ) Total stockholders' equity $ 154,472 $ 1,097 $ 155,569 Consolidated Statement of Cash Flows Fiscal Year 2018 As Previously Reported ASC 606 Adjustments As Adjusted Operating activities Net income $ 254,529 $ (402 ) $ 254,127 Depreciation and amortization 49,755 906 50,661 Change in deferred income taxes 613 (49 ) 564 Other, net (71 ) (609 ) (680 ) Accounts receivable 30,084 133 30,217 Other operating liabilities 113 84 197 Net cash provided by (used in) operating activities 120,860 (99 ) 120,761 Effect of foreign currency fluctuations on cash 9,646 99 9,745 Fiscal Year 2017 As Previously Reported ASC 606 Adjustments As Adjusted Operating activities Net income $ 47,989 $ (832 ) $ 47,157 Depreciation and amortization 37,338 813 38,151 Change in deferred income taxes (19 ) 4 (15 ) Other, net (327 ) (65 ) (392 ) Accounts receivable (12 ) (2,618 ) (2,630 ) Other operating liabilities (1,068 ) 2,762 1,694 Net cash provided by (used in) operating activities 71,667 — 71,667

Organization and Significant _3

Organization and Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of components of accumulated other comprehensive income (loss)	The following summary sets forth the components of accumulated other comprehensive income (loss) contained in the stockholders’ equity section of the Consolidated Balance Sheets (amounts in thousands): Foreign Currency Translation, net of Tax (1)(2) Post-Retirement Benefit Plan Adjustments, net of Tax Defined Benefit Pension Plans, net of Tax (3)(4) Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss), net of Tax Foreign Exchange Contracts, net of Tax Excluded Component of Fair Value Hedges, net of Tax Net Accumulated Other Comprehensive Income (Loss) Balance at March 31, 2017 $ (25,556 ) $ 1,134 $ (14,998 ) $ (5,299 ) $ 2,907 $ — $ (41,812 ) Other comprehensive income (loss) before reclassifications 35,271 (64 ) 409 5,584 667 — 41,867 Amounts reclassified out of AOCI — (191 ) (242 ) — (2,420 ) — (2,853 ) Other comprehensive income (loss) 35,271 (255 ) 167 5,584 (1,753 ) — 39,014 Balance at March 31, 2018 9,715 879 (14,831 ) 285 1,154 — (2,798 ) Other comprehensive income (loss) before reclassifications (5) (19,835 ) 81 (1,525 ) (11 ) (1,286 ) (6,383 ) (28,959 ) Amounts reclassified out of AOCI (4,230 ) (167 ) 598 — 698 4,134 1,033 Other comprehensive income (loss) (24,065 ) (86 ) (927 ) (11 ) (588 ) (2,249 ) (27,926 ) Balance at March 31, 2019 $ (14,350 ) $ 793 $ (15,758 ) $ 274 $ 566 $ (2,249 ) $ (30,724 ) _______________________________________________________________________________ (1) There were no significant tax effects associated with the cumulative currency translation gains and losses as of March 31, 2019 , 2018 , and 2017 . (2) Other comprehensive income (loss) before reclassifications for the year ended March 31, 2018 and the balance at March 31, 2018 adjusted due to the adoption of ASC 606. (3) Ending balance is net of a tax benefit of $2.4 million , $2.3 million , and $2.7 million as of March 31, 2019 , 2018 , and 2017 , respectively. (4) Activity for the years ended March 31, 2019 and 2018 are net of a tax expense of $0.2 million and $0.4 million , respectively.
Schedule of assets measured at fair value on a recurring basis	Assets and liabilities are measured at fair value on a recurring basis as of March 31, 2019 and 2018 are as follows (amounts in thousands): Carrying Value March 31, Fair Value March 31, Fair Value Measurement Using Carrying Value March 31, Fair Value March 31, Fair Value Measurement Using 2019 2019 Level 1 Level 2 (3) Level 3 2018 2018 Level 1 Level 2 (3) Level 3 Assets (Liabilities): Money markets (1)(2) $ 60,687 $ 60,687 $ 60,687 $ — $ — $ 83,891 $ 83,891 $ 83,891 $ — $ — Derivative assets 5,141 5,141 — 5,141 — 1,154 1,154 — 1,154 — Derivative liabilities — — — — — — — — — — Total debt (294,471 ) (303,170 ) — (303,170 ) — (324,623 ) (343,125 ) — (343,125 ) — _______________________________________________________________________________ (1) Included in the line item “Cash and cash equivalents” on the Consolidated Balance Sheets. (2) Certificates Deposits of $32.2 million and $33.9 million that mature in three months or less are included within the balance as of March 31, 2019 and 2018 , respectively. (3)
Summary of NEC TOKIN option valuation activity using significant unobservable inputs (Level 3)

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Schedule of contingent consideration in business combination	The following table shows the components of the acquisition price (amounts in thousands): Upfront cash consideration (1) $ 148,614 Excess cash payment (2) 3,144 Indemnity asset (3) 8,500 Less: Put option (4) (9,900 ) Net consideration transferred $ 150,358 _______________________________________________ (1) The upfront cash payment was comprised of JPY 6.0 billion plus one half of Excess Cash in an amount of approximately JPY 10.2 billion , approximately $55.0 million and $93.6 million (using the April 19, 2017 exchange rate of 109.007 Japanese Yen to 1.00 U.S. Dollar), respectively. (2) The additional amount paid to NEC Corporation upon the settlement of the adjusted purchase price for the EMD sale. (3) Pursuant to the Stock Purchase Agreement between KEMET and NEC, NEC was required to indemnify TOKIN and/or KEC for any breaches by TOKIN or NEC of certain representations, warranties and covenants in the Stock Purchase Agreement. NEC’s aggregate liability for indemnification claims was limited to $25.0 million . Prior to the acquisition, KEMET's equity method investment balance included an $8.5 million indemnification asset pursuant to this indemnification arrangement. In connection with the TOKIN Acquisition, NEC was released from its indemnification obligations to KEMET without an exchange of consideration; as such, this amount of released obligation was included as purchase consideration by KEMET. (4) Pursuant to the option agreement, dated as of March 12, 2012, by and among NEC and KEMET (the “Option Agreement”), from April 1, 2015 through May 31, 2018, NEC had the right to require KEC to purchase all outstanding capital stock of TOKIN (the “Put Option”). The fair value of the Put Option of $9.9 million was reflected as a liability on KEMET’s balance sheet prior to KEMET’s acquisition of the remaining 66% economic interest in TOKIN. The Put Option was canceled, pursuant to the terms of the TOKIN Purchase Agreement with no exchange of consideration between NEC and KEMET. Accordingly, the fair value of the Put Option reduced the amount of consideration paid to acquire NEC’s equity in TOKIN.
Schedule of allocations of the aggregate purchase price based on the assets and liabilities estimated fair values	The following table presents the allocations of the aggregate purchase price based on the estimated fair values of the assets and liabilities (amounts in thousands): Fair Value Cash $ 315,743 Accounts Receivable 79,295 Inventory 35,310 Other current assets 20,902 Property, Plant and equipment 154,744 Intangible assets (1) 32,996 Equity method investments 11,128 Other assets 6,512 Current portion of long-term debt (3,225 ) Accounts payable (81,642 ) Accrued expenses (44,542 ) Other non-current obligations (105,140 ) Deferred income taxes (5,452 ) Total net assets acquired $ 416,629 ________________________________________________ (1) Includes trade name for $8.0 million and products and relationships of $25.0 million . TOKIN’s technology, products, and relationships were valued as a grouped, composite intangible asset due to the Company’s products being dependent on the existing technology, which enabled a product portfolio that customers found appealing in selecting and designing electronic devices for purchase. The trade name was valued based on the relief from royalty method and has an indefinite remaining useful life. The products and relationships were valued on the excess earnings method and are amortized over 10 years .
Schedule of pro forma information	The following table summarizes, on a pro forma basis, the combined results of operations of the Company and TOKIN as though the acquisition and the Sale of EMD had occurred as of April 1, 2016. The pro forma amounts presented are not necessarily indicative of either the actual consolidated results had the acquisition occurred as of April 1, 2016, or of future consolidated operating results (amounts in thousands, except per share data): Fiscal Years Ended March 31, 2018 (1) 2017 (2) Pro forma revenues (3) $ 1,217,655 $ 1,060,777 Pro forma net income from continuing operations available to common stockholders (3) 51,975 226,086 Pro forma earnings per common share - basic (3) 0.98 4.86 Pro forma earnings per common share - diluted (3) 0.89 4.08 Pro forma common shares - basic 52,798 46,552 Pro forma common shares - diluted 58,640 55,389 ___________________________________________ (1) The net income for the fiscal year ended March 31, 2018 excludes the following: 34% of the gain on sale of the EMD business of $75.2 million , the gain related to the fair value of KEMET’s previous 34% interest in TOKIN of $68.7 million , and the bargain gain on the acquisition of TOKIN of $62.2 million . (2) The net income for the fiscal year ended March 31, 2017 includes the following: 34% of the gain on sale of the EMD business of $123.4 million (which includes the release of a valuation allowance that was recorded in the fourth quarter of fiscal year 2017 and the use of the deferred tax asset which was recorded in the first quarter of fiscal year 2018), the gain related to the fair value of KEMET’s previous 34% interest in TOKIN of $66.7 million , and the bargain gain on the acquisition of TOKIN of $60.3 million . The following table reflects the bargain purchase gain resulting from the TOKIN Acquisition (amounts in thousands): Net consideration transferred $ 150,358 Fair value of KEMET ’ s previously held equity interest in TOKIN (1) 204,112 Less: fair value of net assets acquired (416,629 ) Bargain purchase gain $ (62,159 ) ______________________________________ (1) Value based in the 34% of the enterprise value determined under the discounted cash flow method.

Debt (Tables)

Debt (Tables)	12 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Summary of debt	A summary of debt is as follows (amounts in thousands): March 31, 2019 2018 Term Loan Credit Agreement (1) $ — $ 318,782 TOKIN Term Loan Facility (2) 276,808 — Customer Advances (3) 11,270 — Other, net (4) 6,393 5,841 Total debt 294,471 324,623 Current maturities (28,430 ) (20,540 ) Total long-term debt $ 266,041 $ 304,083 ______________________________________________________________________________ (1) Amount shown is net of discount, bank issuance costs and other indirect issuance costs of $13.3 million as of March 31, 2018 . (2) Amount shown is net of discount, bank issuance costs and other indirect issuance costs of $8.7 million as of March 31, 2019 . (3) Amount shown is net of discount of $2.1 million as of March 31, 2019 . (4) Amounts shown are net of discounts of $0.6 million and $0.5 million as of March 31, 2019 and 2018 , respectively.
Schedule of cash and non-cash components of interest expense	The line item “Interest expense” on the Consolidated Statements of Operations for the fiscal years 2019 , 2018 and 2017 , respectively, is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Contractual interest expense $ 19,471 $ 30,323 $ 38,825 Capitalized interest (232 ) (141 ) (154 ) Amortization of debt issuance costs 334 511 1,390 Amortization of debt (premium) discount 1,481 1,843 (788 ) Imputed interest on acquisition related obligations 57 113 159 Interest expense on capital leases 128 233 323 Total interest expense $ 21,239 $ 32,882 $ 39,755
Schedule of line of credit facilities	.
Schedule of the Company's annual maturities of debt	The following table highlights the Company’s annual cash maturities of debt (amounts in thousands): Annual Maturities of Debt Fiscal Years Ended March 31, 2020 2021 2022 2023 2024 Thereafter TOKIN Term Loan Facility $ 24,826 $ 24,826 $ 24,826 $ 24,826 $ 24,826 $ 161,371 Customer Advances (1) — 1,800 6,850 4,028 734 — Other 3,604 560 647 647 647 909 $ 28,430 $ 27,186 $ 32,323 $ 29,501 $ 26,207 $ 162,280 (1) Repayment of the Customer Capacity Agreements assumes the customers purchase products in a quantity sufficient to require the maximum permitted debt repayment amount per quarter.

Restructuring (Tables)

Restructuring (Tables)	12 Months Ended
	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring and related costs	restructuring plans in progress or recently completed as of March 31, 2019 are summarized in the table below (amounts in thousands): Total expected to be incurred Incurred during year ended March 31, 2019 (4) Cumulative incurred to date Restructuring Plan Segment Personnel Reduction Costs Relocation & Exit Costs Personnel Reduction Costs Relocation & Exit Costs Personnel Reduction Costs Relocation & Exit Costs TOKIN operational & overhead function reduction in force MSA, Corporate, & Solid Capacitors (1) 5,339 — 942 — 5,339 — Tantalum powder facility relocation (2) (3) Solid Capacitors 850 2,468 — 3,355 — 3,355 Axial electrolytic production relocation from Granna to Evora Film and Electrolytic 879 3,232 — 2,296 — 2,296 Reorganization due to decline of MnO2 Products Solid Capacitors 1,798 — 1,585 — 1,585 — ___________________________________________ A summary of the expenses aggregated on the Consolidated Statements of Operations line item “Restructuring charges” in the fiscal years ended March 31, 2019 , 2018 and 2017 , is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Personnel reduction costs $ 2,823 $ 12,587 $ 2,214 Relocation and exit costs 5,956 2,256 3,190 Restructuring charges $ 8,779 $ 14,843 $ 5,404
Schedule of reconciliation of the beginning and ending liability balances for restructuring charges included in the line items "Accrued expenses" and "Other non-current obligations" on the Condensed Consolidated Balance Sheets	A reconciliation of the beginning and ending liability balances for restructuring charges included in the line items “Accrued expenses” and “Other non-current obligations” on the Consolidated Balance Sheets were as follows (amounts in thousands): Personnel Reductions Relocation and Exit Costs Balance at March 31, 2016 $ 976 $ — Costs charged to expense 2,214 3,190 Costs paid or settled (2,130 ) (2,784 ) Change in foreign exchange (61 ) — Balance at March 31, 2017 999 406 TOKIN opening balance — 312 Costs charged to expense (1) 12,384 2,256 Costs paid or settled (3,901 ) (2,662 ) Change in foreign exchange 147 18 Balance at March 31, 2018 9,629 330 Costs charged to expense 2,823 5,956 Costs paid or settled (10,329 ) (5,957 ) Change in foreign exchange (258 ) (13 ) Balance at March 31, 2019 $ 1,865 $ 316

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of the Company's intangible assets	The following table highlights the Company’s intangible assets (amounts in thousands): March 31, 2019 March 31, 2018 Carrying Amount Accumulated Amortization Net Amount Carrying Amount Accumulated Amortization Net Amount Indefinite Lived Intangible Assets: Trademarks $ 15,151 $ — $ 15,151 $ 15,474 $ — $ 15,474 Amortizing Intangibles: Patents (10 - 18 years) 26,662 (12,046 ) 14,616 26,662 (10,625 ) 16,037 Customer relationships (10 - 21 years 37,850 (13,868 ) 23,982 40,131 (11,735 ) 28,396 Other 214 (214 ) — 238 (238 ) — Total amortizing intangibles 64,726 (26,128 ) 38,598 67,031 (22,598 ) 44,433 Total intangible assets $ 79,877 $ (26,128 ) $ 53,749 $ 82,505 $ (22,598 ) $ 59,907
Summary of changes in carrying amount of goodwill	For fiscal years ended March 31, 2019 , 2018 , and 2017 , amortization related to intangibles was $4.5 million , $4.3 million and $2.1 million , respectively, consisting of amortization related to patents of $1.4 million , $1.4 million , and $1.5 million , respectively, and amortization related to customer relationships of $3.1 million , $2.9 million , and $0.6 million , respectively. The weighted-average useful life as of March 31, 2019 and 2018 for patents was 15.8 years and for customer relationships was 12.3 years . The weighted-average period prior to the next renewal for patents was 2.5 years and 3.5 years as of March 31, 2019 and 2018 , respectively. Estimated amortization of intangible assets for each of the next five fiscal years is $4.5 million , and thereafter, amortization will total $16.1 million . Estimated amortization of patents for each of the next five fiscal years is $1.4 million , and thereafter, amortization will total $7.5 million . Estimated amortization of customer relationships for each of the next five fiscal years is $3.1 million , and thereafter, amortization will total $8.6 million . For fiscal year 2019 , the Company completed its impairment test on goodwill and intangible assets with indefinite useful lives as of January 1, 2019 and concluded that goodwill and indefinite-lived assets were not impaired. The were no changes to the carrying amount of goodwill for the years ended March 31, 2019 and 2018 . As of March 31, 2019 , and 2018 , the carrying amount of goodwill was $40.3 million .

Equity Method Investments (Tabl

Equity Method Investments (Tables)	12 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments	Summarized financial information for TOKIN for fiscal years 2018 and 2017 are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 Net sales $ 23,649 $ 328,822 Gross profit 6,647 74,465 Net income 247,786 128,502 A reconciliation between TOKIN’s net income and KEMET’s equity investment income for fiscal years 2018 and 2017 are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 TOKIN net income $ 247,786 $ 128,502 KEMET’s equity ownership % 34 % 34 % Equity income from TOKIN before Adjustments $ 84,247 $ 43,691 Adjustments: Amortization and depreciation (113 ) (2,210 ) Removal of EMD memo accounts (8,981 ) — Inventory profit elimination 24 162 Equity income from TOKIN 75,177 41,643 Acquired equity method investment income 1,015 — Equity income from equity method investments $ 76,192 $ 41,643 The following table provides a reconciliation of equity method investments to the Company's Consolidated Balance Sheets (amounts in thousands): March 31, 2019 2018 Nippon Yttrium Co., Ltd ("NYC") $ 8,215 $ 8,148 NT Sales Co., Ltd ("NTS") 1,218 998 Novasentis 977 2,870 KEMET Jianghai Electronics Components Co., Ltd (“KEMET Jianghai”) 2,515 — $ 12,925 $ 12,016
Schedule of Related Party Transactions	Summarized transactions between TOKIN and NTS are as follows (amounts in thousands): Fiscal Year Ended March 31, 2019 2018 KEMET's sales to NTS $ 49,740 $ 52,883 NTS' sales to KEMET 2,501 1,616 Summarized transactions between KEC and TOKIN are as follows (amounts in thousands): 19 Day Period Ended April 19, 2017 Fiscal Year March 31, 2017 KEC’s sales to TOKIN $ 727 $ 17,100 TOKIN’s sales to KEMET 356 8,341

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting [Abstract]
Summary of the profit or loss and total assets for each reportable segment		(amounts in thousands): Fiscal Year Ended March 31, 2019 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim ("APAC") $ 411,183 $ 51,923 $ 70,234 $ 533,340 Europe, the Middle East, and Africa ("EMEA") 189,992 122,956 2,587 315,535 North and South America ("Americas") 297,167 30,462 10,213 337,842 Japan and Korea ("JPKO") 37,496 899 157,706 196,101 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Sales channel OEM $ 290,058 $ 81,704 $ 226,544 $ 598,306 Distributor 475,190 100,113 9,315 584,618 EMS 170,590 24,423 4,881 199,894 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Major product lines Tantalum $ 563,255 $ — $ — $ 563,255 Ceramics 372,583 — — 372,583 Film and Electrolytic — 206,240 — 206,240 MSA — — 240,740 240,740 $ 935,838 $ 206,240 $ 240,740 $ 1,382,818 Fiscal Year Ended March 31, 2018 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim $ 350,791 $ 58,922 $ 70,274 $ 479,987 Europe, the Middle East, and Africa 156,169 119,649 2,080 277,898 North and South America 227,582 22,634 8,889 259,105 Japan and Korea 36,698 772 145,721 183,191 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Sales channel OEM $ 262,097 $ 86,049 $ 215,349 $ 563,495 Distributor 366,569 92,708 11,047 470,324 EMS 142,574 23,220 568 166,362 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Major product lines Tantalum $ 495,114 $ — $ — $ 495,114 Ceramics 276,126 — — 276,126 Film and Electrolytic — 201,977 — 201,977 MSA — — 226,964 226,964 $ 771,240 $ 201,977 $ 226,964 $ 1,200,181 Fiscal Year Ended March 31, 2017 Solid Capacitors Film and Electrolytic MSA Total Primary geographical markets Asia and the Pacific Rim $ 237,847 $ 50,917 $ — $ 288,764 Europe, the Middle East, and Africa 128,617 108,820 — 237,437 North and South America 202,812 21,244 — 224,056 Japan and Korea 5,834 1,247 — 7,081 $ 575,110 $ 182,228 $ — $ 757,338 Sales channel OEM $ 162,411 $ 83,986 $ — $ 246,397 Distributor 275,591 79,048 — 354,639 EMS 137,108 19,194 — 156,302 $ 575,110 $ 182,228 $ — $ 757,338 Major product lines Tantalum $ 342,184 $ 342,184 Ceramics 232,926 232,926 Film and Electrolytic 182,228 — 182,228 MSA — — — — $ 575,110 $ 182,228 $ — $ 757,338 The following highlights net sales by geographic location (amounts in thousands): Fiscal Years Ended March 31, (1) 2019 2018 2017 United States $ 292,980 $ 233,133 $ 198,250 Hong Kong 188,102 169,073 121,813 Germany 124,805 105,548 104,755 Europe (2) (3) 76,149 64,248 63,863 China 173,148 163,016 71,223 Taiwan 88,853 78,728 9,147 Asia Pacific (2) 47,233 36,647 26,878 Japan 178,502 170,282 3,565 United Kingdom 42,472 37,038 33,837 Netherlands 44,065 39,684 32,478 Malaysia 33,748 28,165 15,177 Singapore 19,417 17,267 15,565 Italy 15,551 17,905 15,376 Hungary 12,245 13,254 18,856 Mexico 44,267 23,915 22,424 Other Countries (2) 1,281 2,278 4,131 Total Non-United States (3) 1,089,838 967,048 559,088 $ 1,382,818 $ 1,200,181 $ 757,338 ______________________________________________________________________________ (1) Revenues are attributed to countries or regions based on the location of the customer. Net Sales to one customer, TTI, Inc., exceeded 10% of total net sales as follows: $184.3 million , $133.5 million and $104.4 million in fiscal years 2019 , 2018 and 2017 , respectively. (2) No country included in this caption exceeded 3% of consolidated net sales for fiscal years 2019 , 2018 and 2017 . (3) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. The following tables summarize information for operating income (loss), depreciation and amortization, restructuring charges, gain (loss) on write down and disposal of long-lived assets, and capital expenditures by reportable segment for the fiscal years ended 2019 , 2018 and 2017 and total assets by reportable segment for the fiscal years ended 2019 and 2018 (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Operating income (loss): (1) Solid Capacitors $ 348,150 $ 234,473 $ 147,662 Film and Electrolytic (1) 8,183 3,622 (9,028 ) MSA 22,546 15,694 — Corporate (178,030 ) (140,937 ) (103,666 ) $ 200,849 $ 112,852 $ 34,968 Depreciation and amortization expense: (1) Solid Capacitors $ 28,795 $ 27,329 $ 20,824 Film and Electrolytic (1) 9,763 10,918 11,766 MSA 5,226 4,407 — Corporate 8,844 8,007 5,561 $ 52,628 $ 50,661 $ 38,151 Restructuring charges: Solid Capacitors $ 4,922 $ 983 $ 1,333 Film and Electrolytic 2,717 5,788 3,738 MSA 452 3,343 — Corporate 688 4,729 333 $ 8,779 $ 14,843 $ 5,404 (Gain) loss on write down and disposal of long-lived assets Solid Capacitors $ 235 $ 689 $ 2,303 Film and Electrolytic (93 ) (3,356 ) 8,339 MSA — 1,272 — Corporate 1,518 403 29 $ 1,660 $ (992 ) $ 10,671 Capital expenditures: Solid Capacitors $ 80,700 $ 31,249 $ 12,300 Film and Electrolytic 16,000 12,651 7,955 MSA 13,400 8,481 — Corporate 35,956 12,623 5,362 $ 146,056 $ 65,004 $ 25,617 _______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. March 31, 2019 2018 Total assets: Solid Capacitors $ 794,402 $ 704,851 Film and Electrolytic (1) 219,711 240,968 MSA 234,419 254,193 Corporate 69,563 22,911 $ 1,318,095 $ 1,222,923
Schedule of net sales by geographical location	The following highlights net sales by geographic location (amounts in thousands): Fiscal Years Ended March 31, (1) 2019 2018 2017 United States $ 292,980 $ 233,133 $ 198,250 Hong Kong 188,102 169,073 121,813 Germany 124,805 105,548 104,755 Europe (2) (3) 76,149 64,248 63,863 China 173,148 163,016 71,223 Taiwan 88,853 78,728 9,147 Asia Pacific (2) 47,233 36,647 26,878 Japan 178,502 170,282 3,565 United Kingdom 42,472 37,038 33,837 Netherlands 44,065 39,684 32,478 Malaysia 33,748 28,165 15,177 Singapore 19,417 17,267 15,565 Italy 15,551 17,905 15,376 Hungary 12,245 13,254 18,856 Mexico 44,267 23,915 22,424 Other Countries (2) 1,281 2,278 4,131 Total Non-United States (3) 1,089,838 967,048 559,088 $ 1,382,818 $ 1,200,181 $ 757,338 ______________________________________________________________________________ (1) Revenues are attributed to countries or regions based on the location of the customer. Net Sales to one customer, TTI, Inc., exceeded 10% of total net sales as follows: $184.3 million , $133.5 million and $104.4 million in fiscal years 2019 , 2018 and 2017 , respectively. (2) No country included in this caption exceeded 3% of consolidated net sales for fiscal years 2019 , 2018 and 2017 . (3) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606.
Schedule of property, plant and equipment, net, based on physical location	he following geographic information includes Property, plant and equipment, net, based on physical location (amounts in thousands): March 31, 2019 2018 United States $ 57,095 $ 49,530 Japan 89,602 79,855 Thailand 82,389 74,100 Mexico 121,147 62,503 Italy 35,197 39,398 China 45,815 36,396 Portugal 31,872 29,073 Macedonia 12,906 13,723 Bulgaria 5,480 5,597 Sweden 4,800 6,005 Other (1) 8,977 9,136 Total Non-United States 438,185 355,786 $ 495,280 $ 405,316

Discontinued Operations Discont

Discontinued Operations Discontinued Operations (Tables)	12 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Net sales and net operating (loss) from the Company's discontinued operation	Net sales and net operating loss from the Company’s discontinued operation for years ended March 31, 2019 , 2018 and 2017 were as follows (in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Net sales $ — $ — $ — Operating income (loss) — — —

Pension and Other Post-retire_2

Pension and Other Post-retirement Benefit Plans (Tables)	12 Months Ended
	Mar. 31, 2019
Retirement Benefits [Abstract]
Summary of the changes in benefit obligations and plan assets	A summary of the changes in benefit obligations and plan assets at March 31, 2019 and 2018 is as follows (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Change in Benefit Obligation Benefit obligation at beginning of the year $ 161,673 $ 45,171 $ 367 $ 386 Service cost 4,716 4,585 — — Interest cost 1,815 1,750 11 12 Plan participants’ contributions — — 641 536 Actuarial (gain) loss 1,146 437 (81 ) 64 Foreign currency exchange rate change (8,402 ) 9,934 — — Gross benefits paid (1,097 ) (1,128 ) (626 ) (631 ) Curtailments and settlements (11,411 ) (5,642 ) — — Acquisitions — 106,566 — — Benefit obligation at end of year $ 148,440 $ 161,673 $ 312 $ 367 Change in Plan Assets Fair value of plan assets at beginning of year $ 71,491 $ 10,004 $ — $ — Actual return on plan assets 1,165 2,594 — — Foreign currency exchange rate changes (3,161 ) 3,831 — — Employer contributions 7,882 4,766 (15 ) 95 Settlements (12,379 ) (5,659 ) — — Plan participants’ contributions — — 641 536 Gross benefits paid (1,096 ) (1,128 ) (626 ) (631 ) Acquisitions — 57,083 — — Fair value of plan assets at end of year $ 63,902 $ 71,491 $ — $ — Funded status at end of year Fair value of plan assets $ 63,902 $ 71,491 $ — $ — Benefit obligations (148,440 ) (161,673 ) (312 ) (367 ) Amount recognized at end of year $ (84,538 ) $ (90,182 ) $ (312 ) $ (367 )
Schedule of amounts recognized in the Consolidated Balance Sheets	Amounts recognized in the Consolidated Balance Sheets at March 31, 2019 and 2018 consist of the following (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Noncurrent asset $ 670 $ — $ — $ — Current liability $ (2,753 ) $ (7,000 ) $ (50 ) $ (54 ) Noncurrent liability (82,455 ) (83,182 ) (262 ) (313 ) Net Amount recognized, end of year $ (84,538 ) $ (90,182 ) $ (312 ) $ (367 )
Schedule of amounts recognized in Accumulated other comprehensive income (loss)	Amounts recognized in Accumulated other comprehensive income (loss) at March 31, 2019 and 2018 consist of the following (amounts in thousands): Pension Other Benefits 2019 2018 2019 2018 Net actuarial loss (gain) $ 16,864 $ 15,691 $ (793 ) $ (879 ) Prior service cost 1,325 1,413 — — Accumulated other comprehensive (income) loss $ 18,189 $ 17,104 $ (793 ) $ (879 )
Schedule of components of benefit costs (credit)	omponents of net periodic benefit (income) costs for the fiscal years ended March 31, 2019 , 2018 and 2017 are as follows (amounts in thousands): Pension Other Benefits 2019 2018 2017 2019 2018 2017 Net service cost $ 4,716 $ 4,585 $ 1,298 $ — $ — $ — Interest cost 1,815 1,750 1,297 11 12 11 Expected return on plan assets (1) (2,037 ) (1,956 ) (346 ) — — — Amortization: Actuarial (gain) loss (2) 396 393 419 (167 ) (191 ) (207 ) Prior service cost 87 87 82 — — — Recurring activity 4,977 4,859 2,750 (156 ) (179 ) (196 ) One time expense (income) 115 (71 ) (11 ) — — — Net periodic benefit cost (credit) $ 5,092 $ 4,788 $ 2,739 $ (156 ) $ (179 ) $ (196 )
Schedule of asset allocation for the Company's defined benefit pension plans and the target allocation by asset category	The asset allocation for the Company’s defined benefit pension plans at March 31, 2019 and the target allocation for 2019 , by asset category, are as follows: Asset Category Target Allocation (%) Plan Assets at March 31, 2019 (%) Insurance (1) 1 1 International equities 34 31 International bonds 61 61 Other 4 7 Total 100 100 _______________________________________________________________________ (1) Comprised of assets held by the defined benefit pension plan in Germany.
Schedule of other changes in plan assets and benefit obligations recognized in Accumulated other comprehensive income (loss)	Other changes in plan assets and benefit obligations recognized in Accumulated other comprehensive income (loss) are as follows (amounts in thousands): Pension Other Benefits 2019 2018 2017 2019 2018 2017 Current year actuarial (gain) loss $ 1,684 $ (184 ) $ 1,229 $ (81 ) $ 64 $ (228 ) Amortization of actuarial gain (loss) (511 ) (322 ) (619 ) 167 191 208 Current year prior service cost — — — — — — Amortization of prior service cost (87 ) (87 ) (82 ) — — — Total recognized in other comprehensive income $ 1,086 $ (593 ) $ 528 $ 86 $ 255 $ (20 ) Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 6,178 $ 4,195 $ 3,267 $ (70 ) $ 76 $ (216 )
Schedule of expected future benefit payments	The Company expects to have benefit payments in the future as follows (amounts in thousands): Expected benefit payments 2020 2021 2022 2023 2024 2025- 2029 Pension benefits $ 6,707 $ 6,679 $ 8,416 $ 8,126 $ 9,828 $ 54,107 Other benefits 51 47 42 37 33 105 Total $ 6,758 $ 6,726 $ 8,458 $ 8,163 $ 9,861 $ 54,212
Schedule of weighted-average assumptions used to determine the projected benefit obligation at the measurement date and the net periodic cost for the pension and post-retirement plan	The following weighted-average assumptions were used to determine the projected benefit obligation at the measurement date and the net periodic cost for the pension and post-retirement plan (amounts in thousands except percentages): Pension Other Benefits 2019 2018 2019 2018 Projected benefit obligation: Discount rate 1.2 % 1.2 % 3.3 % 3.5 % Rate of compensation increase 3.5 % 3.5 % — % — % Health care cost trend on covered charges 6.5% 7.0% Net periodic benefit cost: Discount rate 1.3 % 1.2 % 3.5 % 3.2 % Rate of compensation increase 3.5 % 3.5 % — % — % Expected return on plan assets 3.0 % 3.0 % — % — % Health care cost trend on covered charges 7.0% decreasing to ultimate trend of 5.0% in 2022 7.0%
Schedule of fair value of pension plan assets measured on recurring basis	The Company evaluated input from its third-party actuary to determine the appropriate discount rate. The determination of the discount rate is based on various factors such as the rate on bonds, term of the expected payou
Summary of changes in the fair value of the defined benefit pension plan's Level 3 assets	The table below sets forth a summary of changes in the fair value of the defined benefit pension plan’s Level 3 assets for the fiscal years ended March 31, 2018 and March 31, 2019 (amounts in thousands): Balance at March 31, 2017 $ 580 Actual return on plan assets 41 Employer contributions 219 Benefits paid (233 ) Foreign currency exchange rate change 90 Balance at March 31, 2018 $ 697 Actual return on plan assets 20 Employer contributions 233 Benefits paid (247 ) Foreign currency exchange rate change (61 ) Balance at March 31, 2019 $ 642

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of major components of stock-based compensation expense	The major components of stock-based compensation expense are as follows (amounts in thousands): Fiscal year ended March 31, 2019 Fiscal year ended March 31, 2018 Fiscal year ended March 31, 2017 Stock Options Restricted Stock LTIPs Stock Options Restricted Stock LTIPs Stock Options Restricted Stock LTIPs Cost of sales $ — $ 1,502 $ 1,254 $ — $ 865 $ 654 $ 21 $ 634 $ 729 Selling, general and administrative expenses — 7,338 2,413 — 4,195 1,695 20 1,490 1,620 Research and development — 88 271 — 46 202 1 26 179 $ — $ 8,928 $ 3,938 $ — $ 5,106 $ 2,551 $ 42 $ 2,150 $ 2,528
Schedule of employee stock option activity	Employee stock option activity for fiscal year 2019 is as follows: Options (in thousands) Weighted- Average Exercise Price Outstanding at April 1, 2018 230 $ 6.36 Exercised (74 ) 6.42 Expired (1 ) 1.92 Outstanding at March 31, 2019 155 6.37 Exercisable at March 31, 2019 155 $ 6.37 Remaining weighted average contractual life of options exercisable (years) 2.84 Remaining weighted average contractual life of options outstanding (years) 2.84
Summary of the weighted average assumptions used in the Black-Scholes valuation model to value stock option grants	Amounts included in the following table are in thousands, except weighted average fair value and weighted average exercise price: Fiscal Years Ended 2019 2018 2017 Weighted average grant-date fair value of non-vested shares $ — $ — $ 2.72 Weighted average grant-date fair value of shares Granted — — — Vested — — 2.72 Forfeited — — 2.72 Total estimated fair value of shares vested — — 223 Intrinsic value Stock options exercised 1,296 6,914 890 Options outstanding 1,644 2,713 Options currently exercisable 1,644 2,713 Total unrecognized compensation cost, non-vested options — Weighted-average period of recognition for unrecognized compensation cost (in years) N/A Weighted average exercise price of stock options expected to vest N/A
Schedule of restricted stock activity	RSU activity, including performance-based and time-based LTIP activity, for fiscal year 2019 is as follows (amounts in thousands except fair value): Shares Weighted- average Fair Value on Grant Date Non-vested restricted stock at April 1, 2018 2,452 $ 7.96 Granted 910 19.43 Vested (1) (1,789 ) 7.67 Forfeited (2) (158 ) 12.68 Non-vested restricted stock at March 31, 2019 1,415 $ 15.19 __________________________________________ (1) 33,292 in RSUs were settled for $0.2 million in cash. (2) 85,956 in RSUs were forfeited by Per-Olof Loof, the Company's former Chief Executive Officer upon his resignation in December 2018. Vested shares in the table above include the acceleration of 275,000 shares related to the April 18, 2018 Amended and Restated Employment Agreement for the former Chief Executive Officer, which amended and restated Mr. Loof's prior employment agreement with the Company dated June 29, 2015. Upon the signing of the Amended and Restated Employment Agreement, certain RSUs previously granted to Mr. Loof on June 29, 2015, totaling 175,000 shares, and on September 6, 2017, totaling 100,000 shares, both of which were scheduled to vest over time, became fully vested. Incremental compensation cost resulting from the modification totaled $1.7 million . Additionally, vested shares in the table above include the acceleration of 44,302 shares related to the March 20, 2019 Employment Agreement for the current Chief Executive Officer William Lowe. Upon the signing of the Employment Agreement, certain RSUs previously granted to Mr. Lowe on May 18, 2016, totaling 20,220 shares, May 18, 2017, totaling 11,237 shares, and May 18, 2018, totaling 12,845 shares, each of which were scheduled to vest over time, became fully vested. Incremental compensation cost resulting from the modification totaled $0.2 million . In the Operating activities section of the Consolidated Statements of Cash Flows, stock-based compensation expense was

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Schedule of components of income (loss) before income taxes and equity loss from NEC TOKIN	The components of income before income taxes and equity income (loss) from equity method investments are as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Domestic (U.S.) (1) $ 95,639 $ 141,582 $ (67 ) Foreign (Outside U.S.) (1) 74,792 45,485 9,875 Total (1) $ 170,431 $ 187,067 $ 9,808
Schedule of the provision (benefit) for income tax expense	The provision for income tax expense (benefit) is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Current: Federal $ 170 $ 223 $ — State and local 161 50 62 Foreign 9,966 8,295 4,247 Total current income tax expense from continuing operations 10,297 8,568 4,309 Deferred: Federal (43,804 ) (807 ) (6 ) State and local (773 ) (96 ) (97 ) Foreign (1) (5,180 ) 1,467 88 Deferred tax expense (benefit) from continuing operations (1) (49,757 ) 564 (15 ) Provision for income tax expense (benefit) (1) $ (39,460 ) $ 9,132 $ 4,294
Schedule of reconciliation of the statutory federal income tax rate to the effective income tax rate	Differences between the provision for income taxes on earnings from continuing operations and the amount computed using the U.S. Federal statutory income tax rate are as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Amount computed using the statutory rate (1) $ 35,791 $ 59,162 $ 3,722 Change in U.S. valuation allowance (67,761 ) (66,948 ) (7,080 ) Unremitted earnings of foreign subsidiaries — — 2,127 Effect of prior year adjustments (2) 2,450 (1,337 ) 1,789 IRC section 162(m) limitation (3) 4,553 — — Expired foreign tax credits — 407 4,766 Taxable foreign source income 3,502 22,238 1,835 (Put)/call option valuation impact — — (3,745 ) Non-taxable gain from bargain purchase — (41,292 ) — Deduction related to APA settlement (2,309 ) — — Tax-deductible equity compensation (4,215 ) (5,699 ) (44 ) Other non-deductible expenses (44 ) 220 (893 ) Differences due to U.S. tax law changes (4) — 50,420 — State income taxes, net of federal taxes (5) (695 ) (3,325 ) (35 ) Change in foreign operations tax exposure reserves 132 1,059 108 Foreign tax rate differential 6,501 (400 ) 587 Change in foreign tax law (1,956 ) 251 144 Change in foreign operations valuation allowance (6) (41,133 ) (6,676 ) 983 Nondeductible expenses related to antitrust litigation 14,360 488 — Other effect of foreign operations 11,364 564 30 Provision for income tax expense (benefit) $ (39,460 ) $ 9,132 $ 4,294 ___________________________________________ (1) The statutory income tax rate for the fiscal year ended March 31, 2017 is 35%. The Tax Cuts and Jobs Act enacted on December 22, 2017 reduced the U.S. federal corporate tax rate from 35% to 21%, effective January 1, 2018. Based on the fiscal year of the Company ending on March 31, the statutory income tax rate for the fiscal year ended March 31, 2018 is a blended rate of 31.6% based on the number of days in the fiscal year before January 1, 2018 and the number of days in the fiscal after December 31, 2017. The statutory income tax rate for the fiscal year ended March 31, 2019 is 21%. (2) The effect of prior year adjustments was offset by a full valuation allowance resulting in no impact on the provision for income taxes. (3) Fiscal year ended March 31, 2019 difference consist of $1.5 million related to the expansion of the Sec. 162(m) limitation due to tax law changes. (4) Fiscal year end March 31, 2018 differences due to tax law changes consists of $4.8 million related to foreign earnings and $45.6 million related to tax rate adjustment. $45.6 million related to tax rate adjustment is the gross deferred rate change, which is offset by valuation allowance adjustment, resulting in a net benefit of $0.8 million . (5) Fiscal year ended March 31, 2018 difference consists mainly of $3.7 million related to the revaluation of state net operating loss carryforwards as a result of the change in the federal tax rate. (6) The change in foreign operations valuation allowance excludes other comprehensive income and currency translation adjustments of $3.8 million , $(3.4) million , and $0.9 million for fiscal years ended 2019 , 2018 and 2017 , respectively, which has no impact on the provision for income taxes.
Schedule of the components of deferred tax assets and liabilities	The change in net deferred income tax asset (liability) for the current year is presented below (amounts in thousands): Balance at March 31, 2018 (1) $ (1,221 ) Deferred income taxes related to continuing operations 49,757 Deferred income taxes related to other comprehensive income (223 ) Foreign currency translation (95 ) Balance at March 31, 2019 $ 48,218 ___________________________________________________________ (1) March 31, 2018 adjusted due to the The components of deferred tax assets and liabilities are as follows (amounts in thousands): March 31, 2019 2018 Deferred tax assets: Net operating loss carry forwards $ 78,986 $ 115,064 Sales allowances and inventory reserves 10,967 9,675 Medical and employee benefits 35,298 38,572 Depreciation and differences in basis 5,318 6,241 Accrued restructuring 469 2,551 Anti-trust fines and settlements 910 16,575 Tax credits 3,394 4,208 Stock-based compensation 5,589 1,765 Other (1) 1,342 2,812 Total deferred tax assets before valuation allowance 142,273 197,463 Less valuation allowance (58,658 ) (171,401 ) Total deferred tax assets 83,615 26,062 Deferred tax liabilities: Unremitted earnings of subsidiaries (21,850 ) (11,678 ) Amortization of intangibles and debt discounts (11,996 ) (14,054 ) Non-amortized intangibles (1,551 ) (1,551 ) Total deferred tax liabilities (35,397 ) (27,283 ) Net deferred tax assets (liabilities) $ 48,218 $ (1,221 ) __________________________________________________________________ (1)
Schedule of annual activities included in the deferred tax valuation allowance	The following table presents the annual activities included in the deferred tax valuation allowance (amounts in thousands): Valuation Allowance for Deferred Tax Assets Balance at March 31, 2016 $ 170,917 Charge (benefit) to costs and expenses (2,094 ) Deductions (4,925 ) Balance at March 31, 2017 163,898 Charge to costs and expenses 8,647 Deductions (1,144 ) Balance at March 31, 2018 171,401 Charge (benefit) to costs and expenses (112,080 ) Deductions (663 ) Balance at March 31, 2019 $ 58,658
Schedule of tax credit carryforwards available	At March 31, 2019 , the U.S. consolidated group of companies had the following tax credit carryforwards available (amounts in thousands): Tax Credits ($) Fiscal Year of Expiration U.S. research credits $ 1,253 2024 Texas franchise tax credits 2,141 2026
Schedule of reconciliation of gross unrecognized tax benefits (excluding interest and penalties)	At March 31, 2019 , the Company had $7.7 million of unrecognized tax benefits. A reconciliation of gross unrecognized tax benefits (excluding interest and penalties) is as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Beginning of fiscal year $ 8,680 $ 7,390 $ 7,103 Additions from business combinations — 1,270 — Additions for tax positions of the current year 2,027 1,078 762 Additions for tax positions of prior years 519 — — Reductions for tax positions of prior years (633 ) (1,058 ) (64 ) Lapse in statute of limitations (9 ) — (411 ) Settlements (2,923 ) — — End of fiscal year $ 7,661 $ 8,680 $ 7,390

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Mar. 31, 2019
Derivative [Line Items]
Gain (Loss) for Derivative Instruments Designated as Hedges [Table Text Block]	Hedging Strategy Impact on Statements of Operations The following tables present gain and loss activity for the fiscal years ended March 31, 2019 , 2018 , and 2017 for derivative instruments designated as hedges (amounts in thousands): Fiscal Year Ended March 31, 2019 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ (6,383 ) $ (4,134 ) $ 6,034 Cross-currency swaps (2) Net Investment Other income/expense, net 5,009 4,230 — Foreign exchange contracts (3) Cash Flow Cost of sales (1,286 ) (698 ) — Fiscal Year Ended March 31, 2018 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ — $ — $ — Cross-currency swaps (2) Net Investment Other income/expense, net — — — Foreign exchange contracts (3) Cash Flow Cost of sales 667 2,420 — Fiscal Year Ended March 31, 2017 Gain (Loss) Derivative Instrument Hedge Designation Location of Gain (Loss) Recognized in Statements of Operations Recognized in AOCI Reclassified from AOCI to Income Recorded Directly to Income Cross-currency swaps (1) Fair Value Other income/expense, net $ — $ — $ — Cross-currency swaps (2) Net Investment Other income/expense, net — — — Foreign exchange contracts (3) Cash Flow Cost of sales (1,896 ) (5,170 ) — ______________________________________________________________________________ (1) Amounts recognized in AOCI represent the change in the fair value of the derivative instruments related to the excluded components. Amounts reclassified from AOCI to income represent amortization of excluded components based upon the instruments' periodic coupons. Amounts recorded directly to income represent the change in the fair value of the derivative instruments related to the effective portion of the qualifying hedge. (2) Amounts recognized in AOCI represent the total change in the fair value of the derivative instrument. Amounts recorded to AOCI are recorded within foreign currency translation. Amounts reclassified from AOCI to income represent amortization of excluded components based on the instrument's periodic coupon. (3) Amounts recognized in AOCI represent the total change in the fair value of the derivative instruments. Amounts reclassified from AOCI to income represent the change in the fair value of the derivative instruments pertaining to the settlement of the qualifying hedged item (effective portion).
Schedule of Fair Value and Cash Flow Hedges Included in Earnings [Table Text Block]	The following tables present the total amount of each income and expense line item presented in the Consolidated Statements of Operations in which the results of fair value and cash flow hedges are recorded and the effects of those hedging strategies on income (amounts in thousands): Cost of sales Fiscal Year Ended March 31, 2019 2018 2017 Total income (expense) in Statements of Operations (1) $ (924,276 ) $ (860,744 ) $ (571,944 ) Cash flow hedging impact Foreign exchange contracts: Gain (loss) reclassified from AOCI to income (2) (698 ) 2,420 (5,170 ) Other income (expense), net Fiscal Year Ended March 31, 2019 2018 2017 Total income (expense) in Statements of Operations $ (11,214 ) $ (24,592 ) $ 3,871 Fair value hedging impact Cross-currency swaps: Gain (loss) on hedged item (6,034 ) — — Gain (loss) on derivative instrument (3) 1,900 — — _______________________________________________________________________________ (1) Fiscal years ended March 31, 2018 and 2017 adjusted due to the adoption of ASC 606. (2) Net gains of $1.1 million are expected to be reclassified from AOCI into income within the next 12 months. (3) Amounts recognized in income include the change in the fair value of the derivative instruments related to the effective portion of the qualifying hedges and amortization of the excluded components.
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	The balance sheet classifications and fair value of derivative instruments designated as hedges as of March 31, 2019 and 2018 are as follows (amounts in thousands): Fair Value of Derivative Instruments March 31, 2019 March 31, 2018 Hedge Designation Balance Sheet Location As Presented Offset Gross As Presented Offset Gross Derivative assets Cross-currency swaps Fair Value Other assets $ 3,485 $ — $ 3,485 $ — $ — $ — Cross-currency swaps Net Investment Other assets 1,092 — 1,092 — — — Foreign exchange contracts Cash Flow Prepaid and other current assets 564 645 1,209 1,154 — 1,154 Derivative liabilities Foreign exchange contracts Cash Flow Accrued expenses — 645 645 — — —

Supplemental Balance Sheets a_2

Supplemental Balance Sheets and Statements of Operations Detail (Tables)	12 Months Ended
	Mar. 31, 2019
Disclosure Text Block Supplement [Abstract]
Schedule of accounts receivable	March 31, (amounts in thousands) 2019 2018 Accounts receivable: Trade $ 176,715 $ 166,459 Allowance for doubtful accounts reserve (1,206 ) (1,210 ) Ship-from-stock and debit (“SFSD”) reserve (18,862 ) (17,362 ) Returns reserves (1) (964 ) (131 ) Rebates reserves (967 ) (446 ) Price protection reserves (657 ) (420 ) Other — (329 ) Accounts receivable, net (1) $ 154,059 $ 146,561
Schedule of activity in allowances for accounts receivables	The following table presents the annual activities included in the allowance for these commitments (amounts in thousands): Balance at March 31, 2016 $ 22,978 Reduction in sales 87,739 Actual adjustments applied (90,365 ) Other 62 Balance at March 31, 2017 20,414 Reduction in sales 94,660 Actual adjustments applied (1) (95,444 ) Other 268 Balance at March 31, 2018 19,898 Reduction in sales 99,538 Actual adjustments applied (96,775 ) Other (5 ) Balance at March 31, 2019 $ 22,656
Schedule of components of inventories	March 31, (amounts in thousands) 2019 2018 Inventories: Raw materials and supplies $ 97,119 $ 88,408 Work in process 71,374 65,417 Finished goods 88,175 66,907 Inventory gross 256,668 220,732 Inventory reserves (15,539 ) (16,346 ) Inventory, net $ 241,129 $ 204,386
Schedule of the annual activities included in the allowance for commitments	The following table presents the annual activities included in the inventory reserves (amounts in thousands): Balance at March 31, 2016 $ 16,101 Costs charged to expense 6,163 Write-offs (6,125 ) Other (198 ) Balance at March 31, 2017 15,941 Costs charged to expense 4,994 Write-offs (6,954 ) Other (1) 2,365 Balance at March 31, 2018 16,346 Costs charged to expense 6,019 Write-offs (6,826 ) Other — Balance at March 31, 2019 $ 15,539
Schedule of Property, plant and equipment	Useful life (years) March 31, (amounts in thousands, except years) 2019 2018 Property, plant and equipment: Land and land improvements 20 $ 62,232 $ 66,150 Buildings 20 - 40 199,319 186,207 Machinery and equipment 10 916,737 895,914 Furniture and fixtures 4 - 10 82,306 72,811 Construction in progress 105,857 46,391 Other 9,280 4,457 Total property and equipment 1,375,731 1,271,930 Accumulated depreciation (880,451 ) (866,614 ) Property, plant and equipment, net $ 495,280 $ 405,316
Schedule of accrued expenses	March 31, (amounts in thousands) 2019 2018 Accrued expenses: Salaries, wages, and related employee costs $ 61,880 $ 62,778 Interest 211 396 Restructuring 1,869 8,719 Vacation 10,364 10,364 Anti-trust fines and settlements 9,517 33,696 Stock Returns (1) 2,539 2,485 Property, sales, and other taxes 1,854 1,571 Other (1) 5,527 5,110 Total accrued expenses (1) $ 93,761 $ 125,119
Schedule of other non-current obligations	March 31, (amounts in thousands) 2019 2018 Other non-current obligations: Pension plans $ 82,717 $ 83,495 Employee separation liability 7,640 8,539 Deferred compensation 2,285 2,057 Customer deposits 3,689 3,800 Anti-trust fines and settlements 13,168 35,263 Uncertain tax positions 2,415 5,704 Deferred rent 5,366 3,840 Government subsidies 1,247 4,739 Deferred interest income-customer capacity agreements 2,142 — Restructuring 312 1,240 Other (1) 4,379 3,572 Total other non-current obligations (1) $ 125,360 $ 152,249
Schedule of other (income) expense, net	Fiscal Years Ended March 31, (amounts in thousands) 2019 2018 2017 Other (income) expense, net: Net foreign exchange (gains) losses $ (7,230 ) $ 13,145 $ (3,758 ) Legal fines related to anti-trust class actions 6,701 9,900 — Post retirement and pension plan non-service costs 366 210 1,256 Insurance proceeds — — (423 ) Loss on early extinguishment of debt 15,946 486 — Grant (income) (4,559 ) (787 ) — Other (10 ) 1,638 (946 ) Total other (income) expense, net $ 11,214 $ 24,592 $ (3,871 )

Income_Loss Per Share (Tables)

Income/Loss Per Share (Tables)	12 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Schedule of the basic and diluted weighted-average number of shares of common stock	The following table presents the basic and diluted weighted-average number of shares of common stock (amounts in thousands, except per share data): Fiscal Years Ended March 31, 2019 2018 2017 Numerator Net income (1) $ 206,587 $ 254,127 $ 47,157 Denominator: Weighted-average common shares outstanding: Basic 57,840 52,798 46,552 Assumed conversion of employee stock grants 1,242 2,291 2,235 Assumed conversion of warrants — 3,551 6,602 Diluted $ 59,082 $ 58,640 $ 55,389 Net income per basic share (1) $ 3.57 $ 4.81 $ 1.01 Net income per diluted share (1) $ 3.50 $ 4.33 $ 0.85
Schedule of common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been antidilutive	Common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been anti-dilutive, were as follows (amounts in thousands): Fiscal Years Ended March 31, 2019 2018 2017 Assumed conversion of employee stock grants — 71 771

Commitments and Contingencies (

Commitments and Contingencies (Table)	12 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Future minimum lease payments over the next five fiscal years and thereafter under non-cancelable operating leases	Future minimum lease payments over the next five fiscal years and thereafter under non-cancellable operating leases at March 31, 2019 , are as follows (amounts in thousands): Fiscal Years Ended March 31, 2020 2021 2022 2023 2024 Thereafter Minimum lease payments $ 10,898 $ 8,536 $ 5,766 $ 5,322 $ 4,080 $ 13,709

Quarterly Results of Operatio_2

Quarterly Results of Operations (Unaudited) (Table)	12 Months Ended
	Mar. 31, 2019
Quarterly Financial Information Disclosure [Abstract]
Schedule of quarterly information	The following table sets forth certain quarterly information for fiscal years 2019 and 2018 . This information, in the opinion of the Company’s management, reflects all adjustments (consisting only of normal recurring adjustments) necessary to present fairly this information when read in conjunction with the Consolidated Financial Statements and notes thereto included elsewhere herein (amounts in thousands except per share data): Fiscal Year 2019 Quarters Ended Jun-30 Sep-30 Dec-31 Mar-31 Net sales $ 327,616 $ 349,233 $ 350,175 $ 355,794 Gross margin 94,821 113,565 123,750 126,406 Operating income (1) 35,176 50,000 61,616 54,057 Net income $ 35,220 $ 37,141 $ 40,806 $ 93,420 Net income per basic share $ 0.61 $ 0.64 $ 0.70 $ 1.60 Net income per diluted share $ 0.60 $ 0.63 $ 0.69 $ 1.58 Fiscal Year 2018 Quarters Ended Jun-30 Sep-30 Dec-31 Mar-31 Net sales (2) $ 273,946 $ 301,568 $ 306,576 $ 318,091 Gross margin (2) 74,117 84,904 92,288 88,128 Operating income (1) (2) 27,607 31,597 32,002 21,646 Net income (2) $ 220,439 $ 12,819 $ 18,589 $ 2,280 Net income per basic share (2) $ 4.65 $ 0.26 $ 0.33 $ 0.04 Net income per diluted share (2) $ 3.82 $ 0.22 $ 0.32 $ 0.04 ___________________________________________ (1) Operating income (loss) as a percentage of net sales fluctuates from quarter to quarter due to a number of factors, including net sales fluctuations, foreign currency exchange, restructuring charges, product mix, the timing and expense of moving product lines to lower-cost locations, the write-down of long lived assets, the net gain/loss on sales and disposals of assets and the relative mix of sales among distributors, original equipment manufacturers, and electronic manufacturing service provid

Organization and Significant _4

Organization and Significant Accounting Policies - Nature of Business and Organization (Details)	12 Months Ended
	Mar. 31, 2019business_group
Accounting Policies [Abstract]
Number of business groups	3

Organization and Significant _5

Organization and Significant Accounting Policies - Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Money market accounts	$ 60,687	$ 83,891

Organization and Significant _6

Organization and Significant Accounting Policies Organization and Significant Accounting Policies - Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Inventory consigned at customer locations	$ 9.5	$ 8.1

Organization and Significant _7

Organization and Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Depreciation	$ 46.7	$ 45.5	$ 35

Organization and Significant _8

Organization and Significant Accounting Policies - Concentrations of Credit and Other Risk (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Concentration Risk [Line Items]
Tax Cuts & Jobs Act									$ 800
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	$ 1,382,818	$ 1,200,181	$ 757,338
Net sales | Electronics distributor risk
Concentration Risk [Line Items]
Concentration risk, percentage									42.20%	39.20%	46.80%
Net sales | Electronics distributor risk | TTI, Inc.
Concentration Risk [Line Items]
Number of customers									One	1	1
Net sales (1)									$ 184,300	$ 133,500	$ 104,400
Accounts receivable | Credit risk
Concentration Risk [Line Items]
Number of customers									0
Concentration risk, percentage									0.00%

Organization and Significant _9

Organization and Significant Accounting Policies - OCI (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	$ 463,875	$ 155,569	$ 112,481
Other comprehensive income (loss) before reclassifications	(28,959)	41,867
Amounts reclassified out of AOCI	(1,033)	2,853
Other comprehensive income (loss)	(27,926)	39,014
Balance	639,415	463,875	155,569
Foreign currency translation gains (losses) (2)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	9,715	(25,556)
Other comprehensive income (loss) before reclassifications	(19,835)	35,271
Amounts reclassified out of AOCI	(4,230)	0
Other comprehensive income (loss)	(24,065)	35,271
Balance	(14,350)	9,715	(25,556)
Defined benefit post-retirement plan adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	879	1,134
Other comprehensive income (loss) before reclassifications	81	(64)
Amounts reclassified out of AOCI	(167)	(191)
Other comprehensive income (loss)	(86)	(255)
Balance	793	879	1,134
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(14,831)	(14,998)
Other comprehensive income (loss) before reclassifications	(1,525)	409
Amounts reclassified out of AOCI	598	(242)
Other comprehensive income (loss)	(927)	167
Balance	(15,758)	(14,831)	(14,998)
Other Comprehensive Income (Loss), Tax	2,400	2,300	2,700
Defined Benefit Pension Plans, tax benefit	200	(400)
Equity interest in investee's other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	285	(5,299)
Other comprehensive income (loss) before reclassifications	(11)	5,584
Amounts reclassified out of AOCI	0	0
Other comprehensive income (loss)	(11)	5,584
Balance	274	285	(5,299)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	1,154	2,907
Other comprehensive income (loss) before reclassifications	(1,286)	667
Amounts reclassified out of AOCI	698	(2,420)
Other comprehensive income (loss)	(588)	(1,753)
Balance	566	1,154	2,907
Accumulated Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	0	0
Other comprehensive income (loss) before reclassifications	(6,383)	0
Amounts reclassified out of AOCI	(4,134)	0
Other comprehensive income (loss)	(2,249)	0
Balance	(2,249)	0	0
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance	(2,798)	(41,812)	(31,425)
Balance	(30,724)	(2,798)	(41,812)
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Net Investment Hedging [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ 5,009	$ 0	$ 0

Organization and Significant_10

Organization and Significant Accounting Policies - Stock Warrant (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Warrant liability
Proceeds from exercise of stock warrants	$ 0	$ 8,838	$ 0

Organization and Significant_11

Organization and Significant Accounting Policies - Fair Value Measurement (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certificates of Deposit, at Carrying Value	$ 32,200	$ 33,900
Money markets	60,687	83,891
Debt, Long-term and Short-term, Combined Amount	294,471	324,623
Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	60,687	83,891
Debt, Long-term and Short-term, Combined Amount	303,170	343,125
Level 1 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	60,687	83,891
Derivative Instruments in Hedges, Assets, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Debt, Long-term and Short-term, Combined Amount	0	0
Level 2 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	0	0
Derivative Instruments in Hedges, Assets, at Fair Value	5,141
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Debt, Long-term and Short-term, Combined Amount	303,170	343,125
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money markets	0	0
Derivative Instruments in Hedges, Assets, at Fair Value	0	0
Derivative Instruments in Hedges, Liabilities, at Fair Value	0	0
Debt, Long-term and Short-term, Combined Amount	$ 0	0
Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 1,154

Organization and Significant_12

Organization and Significant Accounting Policies - Option Valuation Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in value of TOKIN options	$ 0	$ 0	$ 10,700
Recurring | NEC TOKIN Corporation | Level 3 | Put Option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in value of TOKIN options		$ 10,700

Organization and Significant_13

Organization and Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Contract with Customer, Liability, Current	$ 256	$ 256
Product warranty period	1 year

Organization and Significant_14

Organization and Significant Accounting Policies Organization and Significant Accounting Polices - Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Contract with Customer, Liability, Revenue Recognized	$ 900	$ 300	$ 200
Contract with Customer, Liability, Current	256	256
Contract with Customer, Liability, Noncurrent	0	513
Contract with Customer, Liability	$ 256	$ 769

Organization and Significant_15

Organization and Significant Accounting Policies Organization and Significant Accounting Policies - Contract Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Capitalized Contract Cost, Gross	$ 1.6	$ 2.2
Capitalized Contract Cost, Amortization	$ 0.8	$ 0.9	$ 0.8

Organization and Significant_16

Organization and Significant Accounting Policies - Shipping and Handling (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Shipping and handling costs	$ 31	$ 21.4	$ 16.4

Organization and Significant_17

Organization and Significant Accounting Policies - Grants from Governmental Agencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Revenue from grants	$ 4,559	$ 787	$ 0

Organization and Significant_18

Organization and Significant Accounting Policies Organization and Significant Accounting Policies - Advertising (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Advertising [Abstract]
Advertising Expense	$ 2.5	$ 2.4	$ 1.3

Organization and Significant_19

Organization and Significant Accounting Policies ASC 606 Adjustments Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net (1)	$ 154,059	$ 146,561
Assets, Current	642,053	678,953
Other assets (1)	16,770	12,600
Assets	1,318,095	1,222,923
Accrued expenses (1)	93,761	125,119
Liabilities, Current	278,473	287,658
Deferred income taxes (1)	8,806	15,058
Other non-current obligations (1)	125,360	152,249
Liabilities	678,680	759,048
Retained earnings (1)	204,195	3,370
Accumulated other comprehensive income (loss) (1)	(30,724)	(2,798)
Stockholders' Equity Attributable to Parent	639,415	463,875	$ 155,569	$ 112,481
Liabilities and Equity	$ 1,318,095	1,222,923
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net (1)		2,485
Assets, Current		2,485
Other assets (1)		2,169
Assets		4,654
Accrued expenses (1)		2,742
Liabilities, Current		2,742
Deferred Tax Liabilities, Gross, Noncurrent		487
Other non-current obligations (1)		513
Liabilities		3,742
Retained earnings (1)		695
Accumulated other comprehensive income (loss) (1)		217
Stockholders' Equity Attributable to Parent		912	1,097
Liabilities and Equity		4,654
Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable, net (1)		144,076
Assets, Current		676,468
Other assets (1)		10,431
Assets		1,218,269
Accrued expenses (1)		122,377
Liabilities, Current		284,916
Deferred Tax Liabilities, Gross, Noncurrent		14,571
Other non-current obligations (1)		151,736
Liabilities		755,306
Retained earnings (1)		2,675
Accumulated other comprehensive income (loss) (1)		(3,015)
Stockholders' Equity Attributable to Parent		462,963	$ 154,472
Liabilities and Equity		$ 1,218,269

Organization and Significant_20

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 1,382,818	$ 1,200,181	$ 757,338
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	1,382,818	1,200,181	757,338
Cost of sales (1)									924,276	860,744	571,944
Research and development (1)									44,612	39,114	26,693
Operating income (loss)	54,057	61,616	50,000	35,176	21,646	32,002	31,597	27,607	200,849	112,852	34,968
Income tax expense (benefit) (1)									(39,460)	9,132	4,294
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									206,587	254,127	47,157
Net Income (Loss) Available to Common Stockholders, Basic	$ 93,420	$ 40,806	$ 37,141	$ 35,220	$ 2,280	$ 18,589	$ 12,819	$ 220,439	$ 206,587	$ 254,127	$ 47,157
Earnings Per Share, Basic	$ 1.60	$ 0.70	$ 0.64	$ 0.61	$ 0.04	$ 0.33	$ 0.26	$ 4.65	$ 3.57	$ 4.81	$ 1.01
Earnings Per Share, Diluted	$ 1.58	$ 0.69	$ 0.63	$ 0.60	$ 0.04	$ 0.32	$ 0.22	$ 3.82	$ 3.50	$ 4.33	$ 0.85
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 255	$ (453)
Cost of sales (1)										1,211	1,080
Research and development (1)										(505)	(705)
Operating income (loss)										(451)	(828)
Income tax expense (benefit) (1)										(49)	4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest										$ (402)	$ (832)
Earnings Per Share, Basic										$ (0.01)	$ (0.02)
Earnings Per Share, Diluted										$ (0.01)	$ (0.02)
Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax										$ 1,199,926	$ 757,791
Cost of sales (1)										859,533	570,864
Research and development (1)										39,619	27,398
Operating income (loss)										113,303	35,796
Income tax expense (benefit) (1)										9,181	4,290
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest										$ 254,529	$ 47,989
Earnings Per Share, Basic										$ 4.82	$ 1.03
Earnings Per Share, Diluted										$ 4.34	$ 0.87

Organization and Significant_21

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest									$ 206,587	$ 254,127	$ 47,157
Net Income (Loss) Available to Common Stockholders, Basic	$ 93,420	$ 40,806	$ 37,141	$ 35,220	$ 2,280	$ 18,589	$ 12,819	$ 220,439	206,587	254,127	47,157
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax									(24,065)		(15,284)
Other comprehensive income (loss) before reclassifications									(28,959)	41,867
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax									(588)	(1,753)	3,274
Other comprehensive income (loss) (2)									(27,926)	39,014	(10,387)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									$ 178,661	293,141	36,770
Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest										254,529	47,989
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax										35,054
Other comprehensive income (loss) (2)										38,797
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest										293,326	37,602
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest										(402)	(832)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax										217
Other comprehensive income (loss) (2)										217
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest										$ (185)	$ (832)

Organization and Significant_22

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Changes in Stockholders' Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 206,587	$ 254,127	$ 47,157
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			1,726
Stockholders' Equity Attributable to Parent	639,415	463,875	155,569	$ 112,481
Other comprehensive income (loss) (2)	(27,926)	39,014	(10,387)
Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		254,529	47,989
Stockholders' Equity Attributable to Parent		462,963	154,472
Other comprehensive income (loss) (2)		38,797
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(402)	(832)
Stockholders' Equity Attributable to Parent		912	1,097
Other comprehensive income (loss) (2)		217
Accumulated Other Comprehensive Income (Loss)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0
Stockholders' Equity Attributable to Parent	(30,724)	(2,798)	(41,812)	(31,425)
Other comprehensive income (loss) (2)	(27,926)	39,014	(10,387)
Accumulated Other Comprehensive Income (Loss) | Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' Equity Attributable to Parent		(3,015)
Other comprehensive income (loss) (2)		38,797
Accumulated Other Comprehensive Income (Loss) | Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Stockholders' Equity Attributable to Parent		217
Other comprehensive income (loss) (2)		217
Retained Earnings (Deficit)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification		0	1,596
Stockholders' Equity Attributable to Parent	204,195	3,370	(250,757)	$ (299,510)
Other comprehensive income (loss) (2)	$ 0	0	0
Retained Earnings (Deficit) | Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			(333)
Stockholders' Equity Attributable to Parent		2,675	(251,854)
Retained Earnings (Deficit) | Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			1,929
Stockholders' Equity Attributable to Parent		$ 695	$ 1,097

Organization and Significant_23

Organization and Significant Accounting Policies ASC 606 Adjustments Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 206,587	$ 254,127	$ 47,157
Depreciation and amortization (1)	52,628	50,661	38,151
Change in deferred income taxes (1)	(49,757)	564	(15)
Other Noncash Income (Expense)	(285)	(680)	(392)
Increase (Decrease) in Accounts Receivable	(8,910)	30,217	(2,630)
Other operating liabilities (1)	(70,627)	197	1,694
Net Cash Provided by (Used in) Operating Activities, Continuing Operations	131,731	120,761	71,667
Effect of foreign currency fluctuations on cash (2)	$ (6,990)	9,745	(1,174)
Restatement Adjustment | Accounting Standards Update 2014-09 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		(402)	(832)
Depreciation and amortization (1)		906	813
Change in deferred income taxes (1)		(49)	4
Other Noncash Income (Expense)		(609)	(65)
Increase (Decrease) in Accounts Receivable		133	(2,618)
Other operating liabilities (1)		84	2,762
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		(99)	0
Effect of foreign currency fluctuations on cash (2)		99
Scenario, Previously Reported
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest		254,529	47,989
Depreciation and amortization (1)		49,755	37,338
Change in deferred income taxes (1)		613	(19)
Other Noncash Income (Expense)		(71)	(327)
Increase (Decrease) in Accounts Receivable		30,084	(12)
Other operating liabilities (1)		113	(1,068)
Net Cash Provided by (Used in) Operating Activities, Continuing Operations		120,860	$ 71,667
Effect of foreign currency fluctuations on cash (2)		$ 9,646

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ in Thousands, ¥ in Billions	Apr. 19, 2017USD ($)	Apr. 19, 2017JPY (¥)Rate	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)Rate	Dec. 31, 2017USD ($)manufacturing_siteRate	Sep. 30, 2017USD ($)Rate	Jun. 30, 2017USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)Rate	Mar. 31, 2017USD ($)	Dec. 31, 2017JPY (¥)manufacturing_siteRate	Apr. 14, 2017USD ($)	Apr. 14, 2017JPY (¥)
Acquisitions
Exchange rate | Rate		10900.70%					11182.30%	11257.40%	11250.20%			11182.30%		11257.40%
Working capital adjustment								$ 0						¥ 0.3
Revenue from Contract with Customer, Excluding Assessed Tax											$ 1,382,818	$ 1,200,181	$ 757,338
Operating income (loss)			$ 54,057	$ 61,616	$ 50,000	$ 35,176	$ 21,646	32,002	$ 31,597	$ 27,607	200,849	112,852	$ 34,968
TOKIN
Acquisitions
Transaction expenses								$ 900
Revenue from Contract with Customer, Excluding Assessed Tax											370,200	358,200
Operating income (loss)											$ 34,800	$ 36,100
TOKIN
Acquisitions
Number of manufacturing sites | manufacturing_site								6						6
Purchase price		¥ 10.2						$ 10,100						¥ 1.1	$ 431,000	¥ 48.2
KEC | TOKIN
Acquisitions
Ownership percentage		100.00%
Interest acquired		66.00%
Purchase price paid	$ 148,600	¥ 16.2
KEC | Cash Distribution | TOKIN
Acquisitions
Purchase price paid	55,000	6
KEC | Excess cash | TOKIN
Acquisitions
Purchase price paid	93,600	¥ 10.2
NEC TOKIN Corporation | KEMET Electronics Corporation | Stock Purchase Agreement
Acquisitions
Ownership percentage		34.00%					34.00%	34.00%				34.00%	34.00%	34.00%
Equity interest in acquiree	$ 204,112

Acquisitions Acquisitions - Com

Acquisitions Acquisitions - Components of the Acquisition Price (Details) $ in Thousands, ¥ in Billions	Apr. 19, 2017USD ($)Rate	Apr. 19, 2017JPY (¥)	Mar. 31, 2018Rate	Dec. 31, 2017USD ($)Rate	Dec. 31, 2017JPY (¥)Rate	Sep. 30, 2017Rate	Apr. 19, 2017JPY (¥)Rate	Apr. 14, 2017USD ($)	Apr. 14, 2017JPY (¥)
Business Acquisition [Line Items]
Exchange rate | Rate	10900.70%		11182.30%	11257.40%	11257.40%	11250.20%	10900.70%
Indemnity asset for legal investigation	$ 8,500
Equity Method Investments | Stockholders Agreement
Business Acquisition [Line Items]
Indemnification assets, low range of outcomes				$ 25,000
TOKIN
Business Acquisition [Line Items]
Net consideration transferred	150,358
Purchase price				$ 10,100	¥ 1.1		¥ 10.2	$ 431,000	¥ 48.2
TOKIN | KEC
Business Acquisition [Line Items]
Upfront cash consideration	$ 148,600	¥ 16.2
Interest acquired	66.00%						66.00%
TOKIN | KEC | Cash Distribution
Business Acquisition [Line Items]
Upfront cash consideration	$ 55,000	6
TOKIN | KEC | Excess cash
Business Acquisition [Line Items]
Upfront cash consideration	93,600	¥ 10.2
Cash Distribution | TOKIN
Business Acquisition [Line Items]
Upfront cash consideration	148,614
Acquisition-related Costs | TOKIN
Business Acquisition [Line Items]
Acquisition payable	3,144
Other Assets | TOKIN
Business Acquisition [Line Items]
Indemnity asset	8,500
Put Option | TOKIN
Business Acquisition [Line Items]
Less: Put option	(9,900)
Net derivative asset (liability)	$ (9,900)

Acquisitions - Assets Acquired

Acquisitions - Assets Acquired and Liabilities Assumed (Details) - TOKIN - USD ($) $ in Thousands	Apr. 19, 2017	Dec. 31, 2017
Allocations of the aggregate purchase price
Cash	$ 315,743
Accounts receivable	79,295
Inventory	35,310
Other current assets	20,902
Property, plant and equipment	154,744
Intangible assets	32,996
Equity method investments	11,128
Other assets	6,512
Current portion of long-term debt	3,225
Accounts payable	81,642
Accrued expenses	44,542
Other non-current obligations	105,140
Deferred income taxes	5,452
Total net assets acquired	$ 416,629
Useful Life (years)	10 years
Products And Relationships
Allocations of the aggregate purchase price
Intangible assets		$ 25,000
Trade Names
Allocations of the aggregate purchase price
Intangible assets		$ 8,000

Acquisitions Acquisitions - Bar

Acquisitions Acquisitions - Bargain Purchase Gain (Details) - USD ($) $ in Thousands	Apr. 19, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Less: fair value of net assets acquired	$ (416,629)
Bargain purchase gain		$ 0	$ (130,880)	$ 0
Exchange rate	10900.70%		11182.30%		11257.40%	11250.20%
TOKIN
Business Acquisition [Line Items]
Bargain purchase gain	$ (62,159)			$ (60,300)
TOKIN
Business Acquisition [Line Items]
Net consideration transferred	150,358
NEC TOKIN Corporation | Stock Purchase Agreement | KEMET Electronics Corporation
Business Acquisition [Line Items]
Preliminary fair value of KEMET’s previously held equity interest in TOKIN	204,112
Japan, Yen | TOKIN
Business Acquisition [Line Items]
Amount of debt TOKIN owed NEC	25,400,000
United States of America, Dollars | TOKIN
Business Acquisition [Line Items]
Amount of debt TOKIN owed NEC	$ 233,200

Acquisitions Acquisitions - Pro

Acquisitions Acquisitions - Pro Forma Results (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	Apr. 19, 2017	Apr. 19, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Components of the Acquisition Price [Abstract]
Pro forma revenues (3)				$ 1,217,655	$ 1,060,777
Pro forma net income from continuing operations available to common stockholders (3)				$ 51,975	$ 226,086
Pro forma earnings per common share - basic (in dollars per share)				$ 0.98	$ 4.86
Pro forma earnings per common share - diluted (in dollars per share)				$ 0.89	$ 4.08
Pro forma common shares - basic (in shares)			57,840	52,798	46,552
Pro forma common shares - diluted (in shares)			59,082	58,640	55,389
Business Acquisition [Line Items]
Equity income (loss) from equity method investments		$ 76,192	$ (3,304)	$ 76,192	$ 41,643
Business combination bargain purchase, gain recognized			$ 0	130,880	0
TOKIN
Business Acquisition [Line Items]
Remeasurement gain (loss)				$ 68,700	66,700
Business combination bargain purchase, gain recognized	$ 62,159				60,300
NEC TOKIN Corporation
Business Acquisition [Line Items]
Equity income (loss) from equity method investments		$ 75,177			$ 41,643
NEC TOKIN Corporation | Stock Purchase Agreement | KEMET Electronics Corporation
Business Acquisition [Line Items]
Ownership percentage	34.00%	34.00%		34.00%	34.00%	34.00%
TOKIN
Business Acquisition [Line Items]
Equity income (loss) from equity method investments		$ 75,200		$ 123,400

Debt - Debt Summary (Details)

Debt - Debt Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Nov. 07, 2018	Mar. 31, 2018
Debt Instrument [Line Items]
Total debt	$ 294,471		$ 324,623
Current maturities	(28,430)		(20,540)
Total long-term debt	266,041		304,083
Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term debt	0	$ 323,400	318,782
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net			13,300
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt	276,808		0
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	8,700
Advanced Payment from Customer
Debt Instrument [Line Items]
Long-term debt	11,270		0
Debt Instrument, Unamortized Discount	2,100
Other, net
Debt Instrument [Line Items]
Long-term debt	6,393		5,841
Debt Instrument, Unamortized Discount	$ 600		$ 500

Debt - Interest Income and Expe

Debt - Interest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Interest expense
Contractual interest expense	$ 19,471	$ 30,323	$ 38,825
Capitalized interest	(232)	(141)	(154)
Amortization of debt issuance costs	334	511	1,390
Amortization of debt (premium) discount	1,481	1,843	(788)
Imputed interest on acquisition related obligations	57	113	159
Interest expense on capital leases	128	233	323
Total interest expense	$ 21,239	$ 32,882	$ 39,755

Debt - Term Loan Credit Agreeme

Debt - Term Loan Credit Agreement (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 15,946	$ 486	$ 0
Interest payable	211	396
Term Loan Credit Agreement
Debt Instrument [Line Items]
Loss on early extinguishment of debt	$ 15,946
Interest payable		$ 200

Debt Debt - TOKIN Term Loan Fac

Debt Debt - TOKIN Term Loan Facility (Details) $ in Thousands, ¥ in Millions	Nov. 07, 2018USD ($)	Nov. 07, 2018JPY (¥)	Mar. 31, 2019USD ($)	Mar. 31, 2019JPY (¥)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Nov. 07, 2018JPY (¥)
Debt Instrument [Line Items]
Payment for Debt Extinguishment or Debt Prepayment Cost			$ 3,234		$ 0	$ 0
Interest Payable, Current			211		396
Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt			$ 276,808		0
Debt Instrument, Interest Rate, Effective Percentage			3.10%
Term Loan Credit Agreement
Debt Instrument [Line Items]
Long-term Debt	$ 323,400		$ 0		$ 318,782
Debt, Prepayment Premium, Percent	1.00%						1.00%
Interest Payable, Current			$ 100
Term Loan A Tranche | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.00%						2.00%
Term Loan B Tranche | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%						2.25%
Term Loan B Tranche | Term Loan Facility | TIBOR
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate			0.13%	0.13%
United States of America, Dollars | Term Loan Facility
Debt Instrument [Line Items]
Proceeds from Issuance of Secured Debt	$ 283,900
Net proceeds	281,800
United States of America, Dollars | Term Loan A Tranche | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt	146,000
Debt Instrument, Periodic Payment, Principal | ¥				¥ 12.4
United States of America, Dollars | Term Loan B Tranche | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt	$ 146,000
Japan, Yen | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt | ¥							¥ 33,000
Proceeds from Issuance of Secured Debt | ¥		¥ 32,100
Japan, Yen | Term Loan A Tranche | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt | ¥							16,500
Debt Instrument, Periodic Payment, Principal | ¥				¥ 1,400
Japan, Yen | Term Loan B Tranche | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt | ¥							¥ 16,500
Property, Plant and Equipment | Term Loan Facility
Debt Instrument [Line Items]
Debt Instrument, Collateral Amount			$ 50,600

Debt Debt - Customer Advances (

Debt Debt - Customer Advances (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Capital expenditures	$ (146,056)	$ (65,004)	$ (25,617)
Restricted Cash	0	$ 0	$ 0
Advanced Payment from Customer
Debt Instrument [Line Items]
Proceeds from issuance of debt	13,400
Capital expenditures	(16,300)
Line of Credit | Advanced Payment from Customer
Debt Instrument [Line Items]
Maximum borrowing capacity	72,000
Line of Credit | Advanced Payment from Customer | Maximum
Debt Instrument [Line Items]
Repayments of debt	1,800
Prepaid Expenses and Other Current Assets
Debt Instrument [Line Items]
Restricted Cash	$ 0

Debt - Revolving Line of Credit

Debt - Revolving Line of Credit, Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	May 02, 2016	Dec. 19, 2014	Sep. 30, 2010	May 05, 2010
Revolving line of credit
Debt Instrument [Line Items]
Credit facility, remaining borrowing capacity	$ 66,000,000
Revolving Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 75,000,000	$ 50,000,000
Current borrowing capacity			$ 75,000,000	60,000,000
Credit facility, remaining borrowing capacity				15,000,000
Number of days considered	5 days
Availability under credit facility (as a percent)	10.00%
Availability under credit facility	$ 7,500,000
Fixed charge coverage ratio	1
Consecutive period of non occurrence of any condition to maintain fixed charge coverage ratio	45 days
Required aggregate revolver commitments to maintain fixed charge coverage ratio (as a percent)	10.00%
Required aggregate revolver commitments to maintain fixed charge coverage ratio	$ 7,500,000
Debt issuance cost, net of amortization	$ 100,000	$ 100,000
Revolving Line of Credit | LIBOR
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Revolving Line of Credit | Greater than 33.3% and less than 66.6%
Debt Instrument [Line Items]
Unused line fee (as a percent)	0.50%
Revolving Line of Credit | Greater than 33.3% and less than 66.6% | Maximum
Debt Instrument [Line Items]
Average daily balance as percentage of total revolving commitment	50.00%
Revolving Line of Credit | Greater than or equal to 66.6%
Debt Instrument [Line Items]
Unused line fee (as a percent)	0.375%
Revolving Line of Credit | Greater than or equal to 66.6% | Maximum
Debt Instrument [Line Items]
Average daily balance as percentage of total revolving commitment	50.00%
Revolving Line of Credit | KEMET Singapore
Debt Instrument [Line Items]
Percentage of assets pledged as collateral	100.00%
Foreign Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 30,000,000
Foreign Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.25%
Foreign Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.75%
Foreign Line of Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
Foreign Line of Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Foreign Line of Credit | KEMET Singapore
Debt Instrument [Line Items]
Borrowing base component one, percentage of borrower's accounts receivable that satisfy certain eligibility criteria				85.00%
Domestic Line of Credit
Debt Instrument [Line Items]
Number of days considered	5 days
Availability under credit facility	$ 3,750,000
Required aggregate revolver commitments to maintain fixed charge coverage ratio	$ 3,750,000
Domestic Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Domestic Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Domestic Line of Credit | Base Rate | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Domestic Line of Credit | Base Rate | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Domestic Line of Credit | KEMET Electronics Corporation
Debt Instrument [Line Items]
Borrowing base component one, percentage of borrower's accounts receivable that satisfy certain eligibility criteria				85.00%
Borrowing base component two, fixed amount for determining second component for borrowing base				$ 6,000,000
Borrowing base component two, percentage of net book value of inventory of borrower that satisfies certain eligibility criteria				40.00%
Borrowing base component three, percentage of net orderly liquidation percentage of the appraised value of inventory that satisfies certain eligibility criteria				85.00%
Borrowing base component three, fixed amount for determining second component for borrowing base				$ 5,100,000
Borrowing base component three, percentage of net orderly liquidation percentage of the appraised value of equipment that satisfies certain eligibility criteria				80.00%
10.5% Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)						10.50%

Debt - Revolving Line of Cred_2

Debt - Revolving Line of Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Proceeds from revolving line of credit	$ 0	$ 0	$ 12,000
Repayments of line of credit	$ 0	$ 33,881	$ 12,000

Debt - Other (Details)

Debt - Other (Details) € in Millions, ¥ in Millions, $ in Millions	1 Months Ended						3 Months Ended		66 Months Ended	96 Months Ended
	Feb. 28, 2019USD ($)	Feb. 28, 2019EUR (€)	Sep. 30, 2017USD ($)Rate	Sep. 30, 2017JPY (¥)Rate	Jul. 31, 2017USD ($)	Jul. 31, 2017EUR (€)	Mar. 31, 2018USD ($)	Mar. 31, 2018EUR (€)	Sep. 01, 2026USD ($)	Feb. 01, 2025USD ($)	Feb. 01, 2025EUR (€)
Debt Instrument [Line Items]
Second part of loan					$ 0.3	€ 0.3
Other Debt Obligations
Debt Instrument [Line Items]
Proceeds from issuance of debt							$ 2.5	€ 2.2
Other Debt Obligations | TOKIN
Debt Instrument [Line Items]
Proceeds from issuance of debt			$ 3.2	¥ 350
Debt Instrument, Basis Spread on Variable Rate			0.40%	0.40%
Stated interest rate (as a percent)			0.53%	0.53%
Other Debt Obligations | Forecast
Debt Instrument [Line Items]
Repayments of other debt										$ 0.2	€ 0.2
Portuguese Government Loan 2 | Other Debt Obligations
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 1.1	€ 0.9
Portuguese Government Loan 2 | Other Debt Obligations | Forecast
Debt Instrument [Line Items]
Repayments of other debt | $									$ 0.1

Debt - Annual Cash Maturities (

Debt - Annual Cash Maturities (Details) $ in Thousands	Mar. 31, 2019USD ($)
Annual maturities of debt
2020	$ 28,430
2021	27,186
2022	32,323
2023	29,501
2024	26,207
Thereafter	162,280
Term Loan Facility
Annual maturities of debt
2020	24,826
2021	24,826
2022	24,826
2023	24,826
2024	24,826
Thereafter	161,371
Advanced Payment from Customer
Annual maturities of debt
2020	0
2021	1,800
2022	6,850
2023	4,028
2024	734
Thereafter	0
Other Debt Obligations
Annual maturities of debt
2020	3,604
2021	560
2022	647
2023	647
2024	647
Thereafter	$ 909

Restructuring - Summary of Rest

Restructuring - Summary of Restructuring Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 8,779	$ 14,843	$ 5,404
Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,823	12,587	2,214
Manufacturing Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,956	2,256	3,190
Electro-magnetic, Sensors & Actuators [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	452	3,343	0
TOKIN | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	5,339
Restructuring and Related Cost, Incurred Cost	942
Cumulative incurred to date	5,339
TOKIN | Relocation & Exit Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	0
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
Solid Capacitors
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,922	983	1,333
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	600
Other Restructuring [Member] | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300
Other Restructuring [Member] | Manufacturing Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300
Film and Electrolytic
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,717	$ 5,788	3,738
Film and Electrolytic | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300
Film and Electrolytic | Manufacturing Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 600
TOKIN | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	900
TOKIN | Electro-magnetic, Sensors & Actuators [Member] | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Cumulative incurred to date	3,800
TOKIN | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Cumulative incurred to date	100
Corporate | TOKIN | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Cumulative incurred to date	1,400
NEVADA | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	850
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
NEVADA | Solid Capacitors | Relocation & Exit Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	2,468
Restructuring and Related Cost, Incurred Cost	3,355
Cumulative incurred to date	3,355
NEVADA | Solid Capacitors | Manufacturing Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,400
Granna, Sweden [Member] | Film and Electrolytic | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	879
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
Granna, Sweden [Member] | Film and Electrolytic | Relocation & Exit Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	3,232
Restructuring and Related Cost, Incurred Cost	2,296
Cumulative incurred to date	2,296
Granna, Sweden [Member] | Film and Electrolytic | Manufacturing Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,300
Reorganization due to decline of MnO2 Products | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	1,798
Restructuring and Related Cost, Incurred Cost	1,585
Cumulative incurred to date	1,585
Reorganization due to decline of MnO2 Products | Solid Capacitors | Relocation & Exit Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	0
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
Tantalum reclaim expected to be recovered	900
Expected cost recoveries for scrap material [Member] | NEVADA | Solid Capacitors | Relocation & Exit Costs
Restructuring Cost and Reserve [Line Items]
Total expected to be incurred	$ 900

Restructuring - Summary of Aggr

Restructuring - Summary of Aggregated Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 8,779	$ 14,843	$ 5,404
Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,956	2,256	3,190
Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 2,823	$ 12,587	$ 2,214

Restructuring - Narrative (Deta

Restructuring - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 8,779	$ 14,843	$ 5,404
Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,823	12,587	2,214
Restructuring Reserve, Accrual Adjustment		0
Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	5,956	2,256	3,190
Restructuring Reserve, Accrual Adjustment		312
Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring charges		200
Solid Capacitors
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,922	983	1,333
Film and Electrolytic
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,717	5,788	3,738
Workforce reductions and administrative overhead		5,200
Film and Electrolytic | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	300
Film and Electrolytic | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			600
NEVADA | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
NEVADA | Solid Capacitors | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3,400
NEVADA | Solid Capacitors | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	3,355
Cumulative incurred to date	3,355
TOKIN | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		4,400
Mexico | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			300
Mexico | Solid Capacitors | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			600
Mexico | K-Salt [Member] | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			100
Matamoros Mexico [Member] | K-Salt [Member] | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		800
TENNESSEE | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			400
TENNESSEE | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			1,900
TENNESSEE | Employee Relocation
Restructuring Cost and Reserve [Line Items]
Restructuring charges		400
Victoria Mexico [Member] | Solid Capacitors | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			100
Restructuring Reserve, Accrual Adjustment		100
Europe
Restructuring Cost and Reserve [Line Items]
Workforce reductions and administrative overhead		200
Europe | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			300
Sweden | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		300
FLORIDA | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		2,700	300
FLORIDA | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 900
SOUTH CAROLINA | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			300
United Kingdom | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 200
Granna, Sweden [Member] | Film and Electrolytic | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	0
Granna, Sweden [Member] | Film and Electrolytic | Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,300
Granna, Sweden [Member] | Film and Electrolytic | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	2,296
Cumulative incurred to date	$ 2,296
Customer Relationships
Restructuring Cost and Reserve [Line Items]
Useful life	12 years 3 months 12 days	12 years 3 months 12 days
TOKIN | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 900
TOKIN | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Cumulative incurred to date	100
Reorganization due to decline of MnO2 Products | Solid Capacitors | Personnel Reduction Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	1,585
Cumulative incurred to date	1,585
Reorganization due to decline of MnO2 Products | Solid Capacitors | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Incurred Cost	0
Cumulative incurred to date	$ 0

Restructuring - Rollforward (De

Restructuring - Rollforward (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of restructuring liability
Costs charged to expense	$ 8,779	$ 14,843	$ 5,404
Personnel reduction costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment		0
Reconciliation of restructuring liability
Balance at the beginning of the period	9,629	999	976
Costs charged to expense	2,823	12,587	2,214
Costs paid or settled	(10,329)	(3,901)	(2,130)
Change in foreign exchange	(258)	147	(61)
Balance at the end of the period	1,865	9,629	999
Personnel reduction costs
Reconciliation of restructuring liability
Costs charged to expense		12,384
Manufacturing and sales office relocation costs
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment		312
Reconciliation of restructuring liability
Balance at the beginning of the period	330	406	0
Costs charged to expense	5,956	2,256	3,190
Costs paid or settled	(5,957)	(2,662)	(2,784)
Change in foreign exchange	(13)	18	0
Balance at the end of the period	316	330	406
Employee Relocation
Reconciliation of restructuring liability
Costs charged to expense		200
Film and Electrolytic
Reconciliation of restructuring liability
Costs charged to expense	2,717	$ 5,788	3,738
Film and Electrolytic | Personnel reduction costs
Reconciliation of restructuring liability
Costs charged to expense	$ 300
Film and Electrolytic | Manufacturing and sales office relocation costs
Reconciliation of restructuring liability
Costs charged to expense			$ 600

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amortizing Intangibles:
Finite-Lived Trademarks, Gross	$ 15,151	$ 15,474
Goodwill	40,294	40,294
Trademarks	15,151	15,474
Carrying Amount	64,726	67,031
Accumulated Amortization	(26,128)	(22,598)
Total amortization	38,598	44,433
Intangible Assets, Net (Including Goodwill)	53,749	59,907
Intangible assets	79,877	82,505
Patents [Member]
Amortizing Intangibles:
Finite-Lived Patents, Gross	26,662	26,662
Accumulated Amortization	(12,046)	(10,625)
Total amortization	$ 14,616	$ 16,037
Patents [Member] | Minimum
Amortizing Intangibles:
Useful life	10 years	10 years
Patents [Member] | Maximum
Amortizing Intangibles:
Useful life	18 years	18 years
Customer Relationships
Amortizing Intangibles:
Useful life	12 years 3 months 12 days	12 years 3 months 12 days
Accumulated Amortization	$ (13,868)	$ (11,735)
Total amortization	23,982	28,396
Finite-Lived Customer Relationships, Gross	$ 37,850	$ 40,131
Customer Relationships | Minimum
Amortizing Intangibles:
Useful life	10 years	10 years
Customer Relationships | Maximum
Amortizing Intangibles:
Useful life	21 years	21 years
Other Intangible Assets [Member]
Amortizing Intangibles:
Accumulated Amortization	$ (214)	$ (238)
Total amortization	0	0
Other Finite-Lived Intangible Assets, Gross	$ 214	$ 238
Purchased technology, customer relationships and patents | Weighted Average [Member]
Amortizing Intangibles:
Useful life	15 years 9 months 12 days	15 years 9 months 6 days

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Amortizing Intangibles:
Amortization charges	$ 4.5	$ 4.3	$ 2.1
Finite-Lived Intangible Assets, Amortization Expense, Year Two	4.5
Amortization expense, year four	4.5
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	16.1
Patents [Member]
Amortizing Intangibles:
Amortization charges	1.4	1.4	1.5
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1.4
Amortization expense, year four	1.4
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	7.5
Customer Relationships
Amortizing Intangibles:
Amortization charges	$ 3.1	$ 2.9	$ 0.6
Useful life	12 years 3 months 12 days	12 years 3 months 12 days
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$ 3.1
Amortization expense, year four	3.1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 8.6
Purchased technology, customer relationships and patents | Weighted Average [Member]
Amortizing Intangibles:
Useful life	15 years 9 months 12 days	15 years 9 months 6 days
Finite-Lived Intangible Asset, Weighted Average Period before Next Renewal or Extension	2 years 6 months	3 years 6 months

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Rollforward (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Goodwill [Line Items]
Goodwill	$ (40,294)	$ (40,294)

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets Goodwill and Intangible Assets (Phantom) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Amortizing Intangibles:
Document Period End Date	Mar. 31, 2019
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$ 4.5
Finite-Lived Intangible Assets, Amortization Expense, Year Three	4.5
Amortization expense, year four	4.5
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4.5
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	16.1
Patents [Member]
Amortizing Intangibles:
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1.4
Finite-Lived Intangible Assets, Amortization Expense, Year Three	1.4
Amortization expense, year four	1.4
Finite-Lived Intangible Assets, Amortization Expense, Year Five	1.4
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 7.5
Patents [Member] | Minimum
Amortizing Intangibles:
Useful life	10 years	10 years
Patents [Member] | Maximum
Amortizing Intangibles:
Useful life	18 years	18 years
Customer Relationships [Member]
Amortizing Intangibles:
Finite-Lived Intangible Assets, Amortization Expense, Year Two	$ 3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3.1
Amortization expense, year four	3.1
Finite-Lived Intangible Assets, Amortization Expense, Year Five	3.1
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 8.6
Useful life	12 years 3 months 12 days	12 years 3 months 12 days
Customer Relationships [Member] | Minimum
Amortizing Intangibles:
Useful life	10 years	10 years
Customer Relationships [Member] | Maximum
Amortizing Intangibles:
Useful life	21 years	21 years

Equity Method Investments - Rec

Equity Method Investments - Reconciliation (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 12,925	$ 12,016
Nippon Yttrium Co., Ltd (NYC)
Schedule of Equity Method Investments [Line Items]
Equity method investments	8,215	8,148
NT Sales Co., Ltd (NTS)
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,218	998
Novasentis
Schedule of Equity Method Investments [Line Items]
Equity method investments	977	2,870
KEMET Jianghai [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 2,515	$ 0

Equity Method Investments - TOK

Equity Method Investments - TOKIN's Joint Ventures (Details) $ in Thousands	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Apr. 19, 2017investment
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 12,925	$ 12,016
Nippon Yttrium Co., Ltd (NYC)
Schedule of Equity Method Investments [Line Items]
Ownership percentage	30.00%
Equity method investments	$ 8,215	8,148
NT Sales Co., Ltd (NTS)
Schedule of Equity Method Investments [Line Items]
Ownership percentage	33.00%
Equity method investments	$ 1,218	$ 998
KEC | TOKIN
Schedule of Equity Method Investments [Line Items]
Interest acquired			66.00%
Ownership percentage			100.00%
TOKIN
Schedule of Equity Method Investments [Line Items]
Number of investments | investment			2
TOKIN | NT Sales Co., Ltd (NTS) | Disposed of by Sale
Schedule of Equity Method Investments [Line Items]
Ownership percentage	67.00%

Equity Method Investments Equit

Equity Method Investments Equity Method Investments - TOKIN and NTS (Details) - NT Sales Co., Ltd (NTS) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
KEMET's sales to NTS	$ 49,740	$ 52,883
NTS' sales to KEMET	$ 2,501	$ 1,616

Equity Method Investments - Inv

Equity Method Investments - Investment in Novasentis (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 12,925	$ 12,016
Novasentis
Schedule of Equity Method Investments [Line Items]
Ownership percentage	28.00%
Equity Method Investment, Other than Temporary Impairment	$ 2,700
Equity method investments	$ 977	$ 2,870

Equity Method Investments - I_2

Equity Method Investments - Investment in TOKIN (Details) $ in Thousands, ¥ in Billions	Apr. 19, 2017USD ($)	Apr. 19, 2017JPY (¥)	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)	May 05, 2010
Schedule of Equity Method Investments [Line Items]
Change in value of TOKIN options			$ 0	$ 0	$ 10,700
TOKIN
Schedule of Equity Method Investments [Line Items]
Transaction expenses						$ 900
10.5% Senior Notes
Schedule of Equity Method Investments [Line Items]
Stated interest rate (as a percent)							10.50%
KEC | TOKIN
Schedule of Equity Method Investments [Line Items]
Ownership percentage	100.00%	100.00%
Purchase price paid	$ 148,600	¥ 16.2
Interest acquired	66.00%	66.00%
NEC TOKIN Corporation | Stock Purchase Agreement | KEMET Electronics Corporation
Schedule of Equity Method Investments [Line Items]
Ownership percentage	34.00%	34.00%		34.00%	34.00%	34.00%
NEC TOKIN Corporation | Put Option | Recurring | Level 3
Schedule of Equity Method Investments [Line Items]
Change in value of TOKIN options				$ 10,700

Equity Method Investments - Sum

Equity Method Investments - Summarized Financial Information (Details) - NEC TOKIN Corporation - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 19, 2017	Mar. 31, 2017
Income Statement Related Disclosures [Abstract]
Net sales	$ 23,649	$ 328,822
Gross profit	6,647	74,465
Net income	$ 247,786	$ 128,502

Equity Method Investments - R_2

Equity Method Investments - Reconciliation of Net Loss to Equity Investment Income (Loss) (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 19, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Adjustments:
Equity income from TOKIN	$ 76,192	$ (3,304)	$ 76,192	$ 41,643
NEC TOKIN Corporation
Schedule of Equity Method Investments [Line Items]
Net income	247,786			128,502
Equity income from TOKIN before Adjustments	84,247			43,691
Adjustments:
Amortization and depreciation	(113)			(2,210)
Removal of EMD memo accounts	(8,981)			0
Inventory profit elimination	24			162
Equity income from TOKIN	$ 75,177			$ 41,643
NEC TOKIN Corporation | KEMET Electronics Corporation | Stock Purchase Agreement
Schedule of Equity Method Investments [Line Items]
KEMET’s equity ownership %	34.00%		34.00%	34.00%	34.00%
Acquired Equity Method Investment
Adjustments:
Equity income from TOKIN	$ 1,015			$ 0

Equity Method Investments - R_3

Equity Method Investments - Reconciliation of Net Assets to Equity Investment Balance (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018	Apr. 19, 2017
Schedule of Equity Method Investments [Line Items]
Investment in TOKIN	$ 12,925	$ 12,016
Purchase price accounting basis adjustment:
Indemnity asset for legal investigation			$ 8,500

Equity Method Investments - Rel

Equity Method Investments - Related Party Transactions (Details) - NEC TOKIN Corporation - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 19, 2017	Mar. 31, 2018
Related Party Transaction [Line Items]
KEC’s sales to TOKIN	$ 727	$ 17,100
TOKIN’s sales to KEMET	$ 356	$ 8,341

Segment and Geographic Inform_3

Segment and Geographic Information - Narrative (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019USD ($)manufacturing_site	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2019USD ($)business_groupmanufacturing_site	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
Segment Reporting [Abstract]
Number of business groups | business_group									3
Segment and geographic information
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									$ 1,660	$ (992)	$ 10,671
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	1,382,818	1,200,181	757,338
Write down of long-lived assets
Assets	1,318,095				1,222,923				1,318,095	1,222,923
Operating income (loss)	54,057	$ 61,616	$ 50,000	$ 35,176	21,646	$ 32,002	$ 31,597	$ 27,607	200,849	112,852	34,968
Depreciation and amortization (1)									52,628	50,661	38,151
Solid Capacitors
Segment and geographic information
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									235	689	2,303
Assets	$ 794,402				704,851				$ 794,402	704,851
Number of manufacturing sites | manufacturing_site	10								10
Operating income (loss)									$ 348,150	234,473	147,662
Depreciation and amortization (1)									28,795	27,329	20,824
Film and Electrolytic
Segment and geographic information
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									(93)	(3,356)	8,339
Assets	$ 219,711				240,968				$ 219,711	240,968
Number of manufacturing sites | manufacturing_site	9								9
Operating income (loss)									$ 8,183	3,622	(9,028)
Depreciation and amortization (1)									9,763	10,918	11,766
Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									0	1,272	0
Assets	$ 234,419				254,193				$ 234,419	254,193
Number of manufacturing sites | manufacturing_site	4								4
Operating income (loss)									$ 22,546	15,694	0
Depreciation and amortization (1)									5,226	4,407	0
Corporate
Segment and geographic information
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									1,518	403	29
Assets	$ 69,563				$ 22,911				69,563	22,911
Operating income (loss)									(178,030)	(140,937)	(103,666)
Depreciation and amortization (1)									8,844	8,007	5,561
Sales Revenue, Goods, Net [Member] | Sales risk
Segment and geographic information
Net sales (1)									$ 184,300	$ 133,500	$ 104,400

Segment and Geographic Inform_4

Segment and Geographic Information Segment and Geographic Information - Summarized Financial Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Segment and geographic information
Assets	$ 1,318,095,000				$ 1,222,923,000				$ 1,318,095,000	$ 1,222,923,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property									(700,000)	1,200,000	$ (400,000)
Asset Impairment Charges									1,000,000	184,000	10,300,000
Restructuring charges									8,779,000	14,843,000	5,404,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									1,660,000	(992,000)	10,671,000
Net sales (1)	355,794,000	$ 350,175,000	$ 349,233,000	$ 327,616,000	318,091,000	$ 306,576,000	$ 301,568,000	$ 273,946,000	1,382,818,000	1,200,181,000	757,338,000
Operating income (loss)	54,057,000	$ 61,616,000	$ 50,000,000	$ 35,176,000	21,646,000	$ 32,002,000	$ 31,597,000	$ 27,607,000	200,849,000	112,852,000	34,968,000
Depreciation and amortization (1)									52,628,000	50,661,000	38,151,000
Additions to Other Assets, Amount									146,056,000	65,004,000	25,617,000
Solid Capacitors
Segment and geographic information
Assets	794,402,000				704,851,000				794,402,000	704,851,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property										(600,000)
Asset Impairment Charges											2,100,000
Restructuring charges									4,922,000	983,000	1,333,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									235,000	689,000	2,303,000
Operating income (loss)									348,150,000	234,473,000	147,662,000
Depreciation and amortization (1)									28,795,000	27,329,000	20,824,000
Additions to Other Assets, Amount									80,700,000	31,249,000	12,300,000
Film and Electrolytic
Segment and geographic information
Assets	219,711,000				240,968,000				219,711,000	240,968,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property										(3,600,000)
Asset Impairment Charges											8,200,000
Restructuring charges									2,717,000	5,788,000	3,738,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									(93,000)	(3,356,000)	8,339,000
Operating income (loss)									8,183,000	3,622,000	(9,028,000)
Depreciation and amortization (1)									9,763,000	10,918,000	11,766,000
Additions to Other Assets, Amount									16,000,000	12,651,000	7,955,000
Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Assets	234,419,000				254,193,000				234,419,000	254,193,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property										(1,300,000)
Restructuring charges									452,000	3,343,000	0
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									0	1,272,000	0
Operating income (loss)									22,546,000	15,694,000	0
Depreciation and amortization (1)									5,226,000	4,407,000	0
Additions to Other Assets, Amount									13,400,000	8,481,000	0
Corporate
Segment and geographic information
Assets	$ 69,563,000				$ 22,911,000				69,563,000	22,911,000
Restructuring charges									688,000	4,729,000	333,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down									1,518,000	403,000	29,000
Operating income (loss)									(178,030,000)	(140,937,000)	(103,666,000)
Depreciation and amortization (1)									8,844,000	8,007,000	5,561,000
Additions to Other Assets, Amount									$ 35,956,000	$ 12,623,000	$ 5,362,000

Segment and Geographic Inform_5

Segment and Geographic Information - Net Sales by Country (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	$ 1,382,818	$ 1,200,181	$ 757,338
Property, plant and equipment, net	495,280				405,316				$ 495,280	405,316
Net sales | Sales risk
Net sales and property, plant and equipment, goodwill, intangible assets
Number of customers									1
Concentration Risk, Geographic									No
Net sales (1)									$ 184,300	133,500	104,400
Net sales | Geographic risk
Net sales and property, plant and equipment, goodwill, intangible assets
Threshold for Disclosure Percentage									3.00%
Property, Plant and Equipment | Geographic risk
Net sales and property, plant and equipment, goodwill, intangible assets
Threshold for Disclosure Percentage									1.35552%
United States
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									$ 292,980	233,133	198,250
Property, plant and equipment, net	57,095				49,530				57,095	49,530
Japan
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									178,502	170,282	3,565
Property, plant and equipment, net	89,602				79,855				89,602	79,855
THAILAND
Net sales and property, plant and equipment, goodwill, intangible assets
Property, plant and equipment, net	82,389				74,100				82,389	74,100
China
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									173,148	163,016	71,223
Property, plant and equipment, net	45,815				36,396				45,815	36,396
Italy
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									15,551	17,905	15,376
Property, plant and equipment, net	35,197				39,398				35,197	39,398
Hungary
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									12,245	13,254	18,856
Mexico
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									44,267	23,915	22,424
Property, plant and equipment, net	121,147				62,503				121,147	62,503
Other
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									1,281	2,278	4,131
Property, plant and equipment, net	8,977				9,136				8,977	9,136
Portugal
Net sales and property, plant and equipment, goodwill, intangible assets
Property, plant and equipment, net	31,872				29,073				31,872	29,073
Macedonia
Net sales and property, plant and equipment, goodwill, intangible assets
Property, plant and equipment, net	12,906				13,723				12,906	13,723
BULGARIA
Net sales and property, plant and equipment, goodwill, intangible assets
Property, plant and equipment, net	5,480				5,597				5,480	5,597
Sweden
Net sales and property, plant and equipment, goodwill, intangible assets
Property, plant and equipment, net	4,800				6,005				4,800	6,005
Total Non-United States
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									1,089,838	967,048	559,088
Property, plant and equipment, net	$ 438,185				$ 355,786				438,185	355,786
Hong Kong
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									188,102	169,073	121,813
Germany
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									124,805	105,548	104,755
Europe
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									76,149	64,248	63,863
Taiwan
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									88,853	78,728	9,147
Asia Pacific
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									47,233	36,647	26,878
United Kingdom
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									42,472	37,038	33,837
Netherlands
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									44,065	39,684	32,478
Malaysia
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									33,748	28,165	15,177
Singapore
Net sales and property, plant and equipment, goodwill, intangible assets
Net sales (1)									$ 19,417	$ 17,267	$ 15,565
Minimum | Net sales | Sales risk
Net sales and property, plant and equipment, goodwill, intangible assets
Concentration risk, percentage									0.00%

Segment and Geographic Inform_6

Segment and Geographic Information Segment and Geographic Information - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,382,818	$ 1,200,181	$ 757,338
Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	935,838	771,240	575,110
Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	206,240	201,977	182,228
Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	240,740	226,964	0
EMEA [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	315,535	277,898	237,437
EMEA [Member] | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	189,992	156,169	128,617
EMEA [Member] | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	122,956	119,649	108,820
EMEA [Member] | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	2,587	2,080	0
Americas [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	337,842	259,105	224,056
Americas [Member] | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	297,167	227,582	202,812
Americas [Member] | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	30,462	22,634	21,244
Americas [Member] | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	10,213	8,889	0
JPKO [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	196,101	183,191	7,081
JPKO [Member] | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	37,496	36,698	5,834
JPKO [Member] | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	899	772	1,247
JPKO [Member] | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	157,706	145,721	0
Asia Pacific [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	533,340	479,987	288,764
Asia Pacific [Member] | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	411,183	350,791	237,847
Asia Pacific [Member] | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	51,923	58,922	50,917
Asia Pacific [Member] | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	70,234	70,274	0
OEM
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	598,306	563,495	246,397
OEM | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	290,058	262,097	162,411
OEM | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	81,704	86,049	83,986
OEM | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	226,544	215,349	0
Distributor
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	584,618	470,324	354,639
Distributor | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	475,190	366,569	275,591
Distributor | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	100,113	92,708	79,048
Distributor | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	9,315	11,047	0
EMS
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	199,894	166,362	156,302
EMS | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	170,590	142,574	137,108
EMS | Film and Electrolytic [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	24,423	23,220	19,194
EMS | Electro-magnetic, Sensors & Actuators [Member]
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	4,881	568	0
Tantalum | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	563,255	495,114	342,184
Ceramics | Solid Capacitors
Segment and geographic information
Revenue from Contract with Customer, Excluding Assessed Tax	$ 372,583	$ 276,126	$ 232,926

Discontinued Operations Disco_2

Discontinued Operations Discontinued Operations - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Net sales and net operating (loss) from discontinued operations
Net sales		$ 5,600
Disposal Group, Including Discontinued Operation, Operating Income (Loss)		300
Machinery Division [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue	$ 0	0	$ 0
Net sales and net operating (loss) from discontinued operations
Disposal Group, Including Discontinued Operation, Operating Income (Loss)	$ 0	$ 0	$ 0

(Gain) Loss on Write-Down and D

(Gain) Loss on Write-Down and Disposal of Long-Lived Assets Impairment Charges - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property	$ (700,000)	$ 1,200,000	$ (400,000)
Proceeds from sale of discontinued operations		3,400,000
Gain (Loss) on Sale of Properties		1,900,000
Cost of Real Estate Sales		200,000
Write down of long-lived assets
Asset Impairment Charges	1,000,000	184,000	10,300,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	1,660,000	(992,000)	10,671,000
Solid Capacitors
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(600,000)
Asset Impairment Charges			2,100,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	235,000	689,000	2,303,000
Film and Electrolytic
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(3,600,000)
Asset Impairment Charges			8,200,000
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	(93,000)	(3,356,000)	8,339,000
KFM [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(1,400,000)
Electro-magnetic, Sensors & Actuators [Member]
Property, Plant and Equipment [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		(1,300,000)
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	0	$ 1,272,000	0
TENNESSEE | Film and Electrolytic
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			4,100,000
Impairment of Long-Lived Assets to be Disposed of			3,000,000
Impairment of Intangible Assets (Excluding Goodwill)			1,100,000
Italy | Film and Electrolytic
Property, Plant and Equipment [Line Items]
Asset Impairment Charges			$ 4,100,000
TOKIN | Land
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	500,000
TOKIN | Machinery and equipment
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 200,000

(Gain) Loss on Write-Down and_2

(Gain) Loss on Write-Down and Disposal of Long-Lived Assets Impairment Charges (Phantom) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Property, Plant and Equipment [Line Items]
Asset Impairment Charges	$ 1,000,000	$ 184,000	$ 10,300,000
Write down of long-lived assets

Pension and Other Post-retire_3

Pension and Other Post-retirement Benefit Plans - Narrative (Details) $ in Millions	12 Months Ended
	Mar. 31, 2019USD ($)plan	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of Fiscal Years	10 years
Number of defined benefit plans | plan	12
Gains net of the employer matches related to the deferred compensation plan	$ 0.1	$ 0.2	$ 0.2
Total benefits accrued	2.3	2.1
Matched contribution of the entity	2.8	2.2	$ 2.4
Defined Benefit Plan Accumulated Other Comprehensive Income (Loss) Tax	$ 2.4	$ 2.3
Maximum
Defined Benefit Plan Disclosure [Line Items]
Company matched contribution (as a percent)	6.00%
Pension
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 0.5
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	5.1
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	0.1
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ 0.1
Number of defined benefit plans | plan	2
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0.1
Europe | Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	6
Singapore | Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	1
Mexico | Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2
Japan | Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	2
THAILAND | Pension
Defined Benefit Plan Disclosure [Line Items]
Number of defined benefit plans | plan	1

Pension and Other Post-retire_4

Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Funded status at end of year
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				$ 6,758
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				6,726
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				8,458
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				8,163
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				9,861
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				54,212
Pension
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	$ (1,684)	$ 184	$ (1,229)
Change in Benefit Obligation
Benefit obligation at beginning of the year	161,673	45,171
Service cost	4,716	4,585	1,298
Interest cost	1,815	1,750	1,297
Plan participants’ contributions	0	0
Actuarial (gain) loss	1,146	437
Foreign currency exchange rate change	(8,402)	9,934
Gross benefits paid	(1,097)	(1,128)
Curtailments and settlements	(11,411)	(5,642)
Defined Benefit Plan, Benefit Obligation, Business Combination	0	106,566
Benefit obligation at end of year	148,440	161,673	45,171
Change in Plan Assets
Fair value of plan assets at beginning of year	71,491	10,004
Actual return on plan assets	1,165	2,594
Foreign currency exchange rate changes	(3,161)	3,831
Employer contributions	(7,882)	(4,766)
Settlements	(12,379)	(5,659)
Plan participants’ contributions	0	0
Gross benefits paid	1,096	1,128
Acquisitions	0	57,083
Fair value of plan assets at end of year	63,902	71,491	10,004
Funded status at end of year
Fair value of plan assets	71,491	10,004	10,004	63,902	$ 71,491
Benefit obligations	(161,673)	(45,171)	(45,171)	(148,440)	(161,673)
Amount recognized at end of year				(84,538)	(90,182)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				6,707
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				6,679
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				8,416
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				8,126
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				9,828
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				54,107
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	(511)	(322)	(619)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	87	87	82
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	1,086	(593)	528
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	6,178	4,195	3,267
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax	81	(64)	228
Change in Benefit Obligation
Benefit obligation at beginning of the year	367	386
Service cost	0	0	0
Interest cost	11	12	11
Plan participants’ contributions	641	536
Actuarial (gain) loss	(81)	64
Foreign currency exchange rate change	0	0
Gross benefits paid	(626)	(631)
Curtailments and settlements	0	0
Defined Benefit Plan, Benefit Obligation, Business Combination	0	0
Benefit obligation at end of year	312	367	386
Change in Plan Assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Foreign currency exchange rate changes	0	0
Employer contributions	(15)	(95)
Settlements	0	0
Plan participants’ contributions	641	536
Gross benefits paid	626	631
Acquisitions	0	0
Fair value of plan assets at end of year	0	0	0
Funded status at end of year
Fair value of plan assets	0	0	0	0	0
Benefit obligations	(367)	(386)	(386)	(312)	(367)
Amount recognized at end of year				(312)	$ (367)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months				51
Defined Benefit Plan, Expected Future Benefit Payment, Year Two				47
Defined Benefit Plan, Expected Future Benefit Payment, Year Three				42
Defined Benefit Plan, Expected Future Benefit Payment, Year Four				37
Defined Benefit Plan, Expected Future Benefit Payment, Year Five				33
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter				$ 105
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	167	191	208
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	86	255	(20)
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax	$ (70)	$ 76	$ (216)

Pension and Other Post-retire_5

Pension and Other Post-retirement Benefit Plans - Amounts in Financial Statements (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Pension
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	$ 670	$ 0
Amounts recognized in the Consolidated Balance Sheets
Current liability	(2,753)	(7,000)
Noncurrent liability	(82,455)	(83,182)
Net Amount recognized, end of year	(84,538)	(90,182)
Accumulated other comprehensive income (loss)
Net actuarial loss (gain)	16,864	15,691
Prior service cost	1,325	1,413
Accumulated other comprehensive (income) loss	18,189	17,104
Components of benefit costs (credit)
Net service cost	4,716	4,585	$ 1,298
Interest cost	1,815	1,750	1,297
Expected return on plan assets (1)	(2,037)	(1,956)	(346)
Amortization:
Actuarial (gain) loss (2)	396	393	419
Prior service cost	87	87	82
Recurring activity	4,977	4,859	2,750
One time expense (income)	115	(71)	(11)
Net periodic benefit cost (credit)	5,092	4,788	2,739
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Assets for Plan Benefits, Defined Benefit Plan	0	0
Amounts recognized in the Consolidated Balance Sheets
Current liability	(50)	(54)
Noncurrent liability	(262)	(313)
Net Amount recognized, end of year	(312)	(367)
Accumulated other comprehensive income (loss)
Net actuarial loss (gain)	(793)	(879)
Prior service cost	0	0
Accumulated other comprehensive (income) loss	(793)	(879)
Components of benefit costs (credit)
Net service cost	0	0	0
Interest cost	11	12	11
Expected return on plan assets (1)	0	0	0
Amortization:
Actuarial (gain) loss (2)	(167)	(191)	(207)
Prior service cost	0	0	0
Recurring activity	(156)	(179)	(196)
One time expense (income)	0	0	0
Net periodic benefit cost (credit)	$ (156)	$ (179)	$ (196)

Pension and Other Post-retire_6

Pension and Other Post-retirement Benefit Plans - Weighted Average Assumptions (Details)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Pension
Projected benefit obligation:
Discount rate	1.20%	1.20%
Rate of compensation increase	3.50%	3.50%
Net periodic benefit cost:
Discount rate	1.30%	1.20%
Rate of compensation increase	3.50%	3.50%
Expected return on plan assets	3.00%	3.00%
Other Benefits
Projected benefit obligation:
Discount rate	3.30%	3.50%
Rate of compensation increase	0.00%	0.00%
Net periodic benefit cost:
Discount rate	3.50%	3.20%
Rate of compensation increase	0.00%	0.00%
Expected return on plan assets	0.00%	0.00%

Pension and Other Post-retire_7

Pension and Other Post-retirement Benefit Plans - Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	1.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	1.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	7.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	4.00%
International Equities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	31.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	34.00%
International Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	61.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	61.00%
Pension
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 63,902	$ 71,491	$ 10,004
Actual return on plan assets	1,165	2,594
Employer contributions	7,882	4,766
Settlements	(12,379)	(5,659)
Benefits paid	(1,096)	(1,128)
Foreign currency exchange rate change	(3,161)	3,831
Pension | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	319	193
Pension | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,965	22,391
Pension | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,030	43,742
Pension | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	642	697
Pension | Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,946	4,468
Pension | Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	319	193
Pension | Level 1 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	319	193
Pension | Level 1 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 1 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 1 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	62,941	70,601
Pension | Level 2 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 2 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,965	22,391
Pension | Level 2 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	39,030	43,742
Pension | Level 2 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 2 | Mutual Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,946	4,468
Pension | Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	642	697	$ 580
Actual return on plan assets	20	41
Employer contributions	233	219
Benefits paid	(247)	(233)
Foreign currency exchange rate change	(61)	90
Pension | Level 3 | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 3 | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 3 | International bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Pension | Level 3 | Insurance contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 642	$ 697

Pension and Other Post-retire_8

Pension and Other Post-retirement Benefit Plans Pension and Other Post-retirement Benefit Plans (Phantom) - Other Benefits	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Health Care Cost Trend Rate on Covered Charges	7.00%	7.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Ultimate Health Care Cost Trend Rate	5.00%	5.00%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Health Care Cost Trend Rate on Covered Charges	7.00%	7.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%	5.00%

Pension and Other Post-retire_9

Pension and Other Post-retirement Benefit Plans - Summary of Changes in the Fair Value of the Defined Benefit Pension Plan (Details) - Pension - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 71,491	$ 10,004
Actual return on plan assets	1,165	2,594
Employer contributions	7,882	4,766
Benefits paid	(1,096)	(1,128)
Foreign currency exchange rate changes	(3,161)	3,831
Fair value of plan assets at end of year	63,902	71,491
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	697	580
Actual return on plan assets	20	41
Employer contributions	233	219
Benefits paid	(247)	(233)
Foreign currency exchange rate changes	(61)	90
Fair value of plan assets at end of year	$ 642	$ 697

Stock-Based Compensation - Expe

Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,938	$ 2,551	$ 2,528
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	0	42
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8,928	5,106	2,150
Cost of sales | LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,254	654	729
Cost of sales | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	0	21
Cost of sales | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,502	865	634
Selling, general and administrative expenses | LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,413	1,695	1,620
Selling, general and administrative expenses | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	0	20
Selling, general and administrative expenses | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	7,338	4,195	1,490
Research and development | LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	271	202	179
Research and development | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	0	1
Research and development | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 88	$ 46	$ 26

Stock-Based Compensation - Empl

Stock-Based Compensation - Employee Stock Options Narrative (Details) - Stock Options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant	12,200
Expiration period	10 years
Options (in thousands)
Options outstanding, beginning balance (in shares)	230
Options exercised (in shares)	74
Options expired (in shares)	1
Options outstanding, ending balance (in shares)	155	230
Options exercisable (in shares)	155
Weighted- Average Exercise Price
Options outstanding weighted average exercise price (in dollars per share)	$ 6.37	$ 6.36
Options exercised weighted average exercise price (in dollars per share)	6.42
Options expired weighted average exercise price (in dollars per share)	1.92
Options exercisable weighted average exercise price (in dollars per share)	$ 6.37
Remaining weighted average contractual life of options exercisable (years)	2 years 10 months 1 day
Remaining weighted average contractual life of options outstanding (years)	2 years 10 months 1 day
Weighted average grant-date fair value of non-vested shares (in dollars per share)	$ 0	0	$ 2.72
Weighted average grant-date fair value of shares
Forfeited (in dollars per share)	0	0	0
Vested (in dollars per share)	0	0	2.72
Granted (in dollars per share)	$ 0	$ 0	$ 2.72
Total estimated fair value of shares vested	$ 0	$ 0	$ 223
Stock options exercised	1,296	6,914	$ 890
Options outstanding	1,644	2,713
Options currently exercisable	1,644	$ 2,713
Total unrecognized compensation cost, non-vested options	$ 0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2011 Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant	11,400
Prior Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for grant	800

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock Option Grants Valuation (Details)	12 Months Ended
	Mar. 31, 2019
Minimum | Stock Options
Assumptions:
Purchase price of common stock percent	100.00%

Stock-Based Compensation - Long

Stock-Based Compensation - Long-Term Incentive Plans Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2019	Mar. 31, 2018
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 8	$ 8.1
LTIPs | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	4.1	1.6
LTIPs | Cash Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation not yet recognized	$ 2.4	$ 0.1

Stock-Based Compensation Stock-

Stock-Based Compensation Stock-Based Compensation - Performance Vesting Stock Options (Details) shares in Thousands	Mar. 31, 2019shares
2019/2020 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	104
2019/2020 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	104
2018/2019 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	0
2018/2019 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	0
2017/2018 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	0
2017/2018 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	0
2016/2017 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of exercisable options (in shares)	173

Stock-Based Compensation - Lo_2

Stock-Based Compensation - Long-term Incentive Plans (Details) shares in Thousands	Mar. 31, 2019shares
2019/2020 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	13
2019/2020 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	53
2019/2020 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	53
2019/2020 | Awards Vesting in 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	54
2018/2019 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	85
2018/2019 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	58
2018/2019 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	60
2017/2018 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	224
2017/2018 | Awards Vesting in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	156
2017/2018 | Awards Vesting in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	0
2016/2017 | Awards Vesting in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vested and expected to vest (in shares)	191

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 20, 2019	Apr. 18, 2018	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Restricted Stock
Shares
Non-vested restricted stock at the beginning of the period (in shares)				2,452,000	2,452,000
Granted (in shares)					910,000
Vested (in shares)					(1,789,000)
Allocated Share-based Compensation Expense					$ 8,928	$ 5,106	$ 2,150
Forfeited (in shares)					(158,000)
Non-vested restricted stock at the end of the period (in shares)			1,415,000		1,415,000	2,452,000
Weighted-average Fair Value on Grant Date
Non-vested restricted stock at the beginning of the period (in dollars per share)				$ 7.96	$ 7.96
Granted (in dollars per share)					19.43
Vested (in dollars per share)					7.67
Forfeited (in dollars per share)					12.68
Non-vested restricted stock at the end of the period (in dollars per share)			$ 15.19		$ 15.19	$ 7.96
Compensation not yet recognized			$ 8,000		$ 8,000	$ 8,100
Director | Restricted Stock
Weighted-average Fair Value on Grant Date
Vesting period					0 years
Officer | Restricted Stock
Weighted-average Fair Value on Grant Date
Vesting period					3 years
Chief executive officer | Restricted Stock
Shares
Vested (in shares)	(44,302)	(275,000)
Weighted-average Fair Value on Grant Date
Period of restriction for sale of shares					90 days
Chief executive officer | Restricted Stock Units
Shares
Forfeited (in shares)					(85,956)
Weighted-average Fair Value on Grant Date
Accelerated compensation cost			200	$ 1,700
June 29, 2015 | Chief executive officer | Restricted Stock Units
Shares
Vested (in shares)		(175,000)
September 6, 2017 | Chief executive officer | Restricted Stock Units
Shares
Vested (in shares)		(100,000)
May 18, 2016 [Member] | Chief executive officer | Restricted Stock Units
Shares
Vested (in shares)	(20,220)
May 18, 2017 [Member] | Chief executive officer | Restricted Stock Units
Shares
Vested (in shares)	(11,237)
May 18, 2018 [Member] | Chief executive officer | Restricted Stock Units
Shares
Vested (in shares)	(12,845)
LTIPs
Shares
Allocated Share-based Compensation Expense					$ 3,938	2,551	$ 2,528
Weighted-average Fair Value on Grant Date
Terms of award					P2Y
LTIPs | Restricted Stock
Weighted-average Fair Value on Grant Date
Compensation not yet recognized			$ 4,100		$ 4,100	$ 1,600
Restricted Stock Units Settled with Cash [Member] | Restricted Stock
Shares
Vested (in shares)					(33,000)
Allocated Share-based Compensation Expense					$ 211
2019/2020 | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			13,000		13,000
2019/2020 | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number			53,000		53,000

Income Taxes - Provision (Benef

Income Taxes - Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Components of Income (loss) before income taxes
Domestic (U.S.)	$ 95,639	$ 141,582	$ (67)
Foreign (Outside U.S.)	74,792	45,485	9,875
Income before income taxes and equity income (loss) from equity method investments (1)	170,431	187,067	9,808
Current:
Federal	170	223	0
State and local	161	50	62
Foreign	9,966	8,295	4,247
Total current income tax expense from continuing operations	10,297	8,568	4,309
Deferred:
Federal	(43,804)	(807)	(6)
State and local	(773)	(96)	(97)
Foreign	(5,180)	1,467	88
Deferred tax expense (benefit) from continuing operations	(49,757)	564	(15)
Provision for income taxes	(39,460)	9,132	4,294
Latest Tax Year
Deferred:
Foreign	$ (50,100)	$ 600	$ 1,200

Income Taxes - Provision (Ben_2

Income Taxes - Provision (Benefit) For Income Taxes Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Amount computed using the statutory rate	$ 35,791	$ 59,162	$ 3,722
Change in U.S. valuation allowance	(67,761)	(66,948)	(7,080)
Unremitted earnings of foreign subsidiaries	0	0	2,127
Effect of prior year adjustments	2,450	(1,337)	1,789
Expired foreign tax credits	0	407	4,766
Effective Income Tax Rate Reconciliation, Foreign Income, Amount	3,502	22,238	1,835
Taxable foreign source income	6,501	(400)	587
(Put)/call option valuation impact	0	0	(3,745)
Non-taxable gain from bargain purchase	0	(41,292)	0
Effective Income Tax Rate Reconciliation, Tax Settlement, Foreign, Amount	(2,309)	0	0
Tax-deductible equity compensation	(4,215)	(5,699)	(44)
Other non-deductible expenses	(44)	220	(893)
Differences due to tax law changes	0	50,420	0
State income taxes, net of federal taxes (5)	(695)	(3,325)	(35)
Change in foreign operations tax exposure reserves	132	1,059	108
Change in foreign tax law	(1,956)	251	144
Change in foreign operations valuation allowance	(41,133)	(6,676)	983
Other effect of foreign operations	11,364	564	30
Provision for income taxes	$ (39,460)	9,132	4,294
Effective income tax rate reconciliation, percent	31.60%
Foreign earnings	$ 4,800
Tax rate adjustment	45,600
Tax Cuts & Jobs Act	800
Differences due to tax law, section 162(m) limitations	1,500
Decrease in currency translation		(3,400)
Increase in currency translation	$ 3,800		900
China
Income Tax Contingency [Line Items]
Statutory tax rate, percent	25.00%
Mexico
Income Tax Contingency [Line Items]
Statutory tax rate, percent	30.00%
China and Mexico
Income Tax Contingency [Line Items]
Provision for income taxes	$ 5,700	3,800	3,100
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards	525,100
State and Local Jurisdiction | United States
Income Tax Contingency [Line Items]
Operating loss carryforwards	3,700
Capacitors Antitrust Litigation
Income Tax Contingency [Line Items]
Other non-deductible expenses	$ 14,360	$ 488	$ 0

Income Taxes - Deferred Tax Ass

Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Net operating loss carry forwards	$ 78,986	$ 115,064
Sales allowances and inventory reserves	10,967	9,675
Medical and employee benefits	35,298	38,572
Depreciation and differences in basis	5,318	6,241
Accrued restructuring	469	2,551
Anti-trust fines and settlements	910	16,575
Tax credits	3,394	4,208
Stock-based compensation	5,589	1,765
Other(1)	1,342	2,812
Total deferred tax assets before valuation allowance	142,273	197,463
Less valuation allowance	(58,658)	(171,401)
Total deferred tax assets	83,615	26,062
Deferred tax liabilities:
Unremitted earnings of subsidiaries	(21,850)	(11,678)
Amortization of intangibles and debt discounts	(11,996)	(14,054)
Non-amortized intangibles	(1,551)	(1,551)
Total deferred tax liabilities	(35,397)	(27,283)
Net deferred tax assets (liabilities)	$ 48,218
Net deferred tax assets (liabilities)		$ (1,221)

Income Taxes - Valuation Allowa

Income Taxes - Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Change in net deferred income tax asset (liability)
Balance at March 31, 2018	$ (1,221)
Deferred income taxes related to continuing operations	49,757
Deferred income taxes related to other comprehensive income	(223)
Foreign currency translation	(95)
Balance at the end of the period	48,218
Valuation Allowance for Deferred Tax Assets
Annual activities included in the deferred tax valuation allowance
Balance at the beginning of the period	171,401	$ 163,898	$ 170,917
Charge (benefit) to costs and expenses	(112,080)	8,647	(2,094)
Deductions	(663)	(1,144)	(4,925)
Balance at the end of the period	$ 58,658	$ 171,401	$ 163,898

Income Taxes - NOL and Tax Cred

Income Taxes - NOL and Tax Credits (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2019USD ($)
U.S. research credits
Tax credit carryforwards
Tax Credits	$ 1,253
Fiscal Year of Expiration	Dec. 31, 2024
Texas franchise tax credits
Tax credit carryforwards
Tax Credits	$ 2,141
Fiscal Year of Expiration	Dec. 31, 2026

Income Taxes - Unrecognized Tax

Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	$ 500	$ 900
Reconciliation of gross unrecognized tax benefits (excluding interest and penalties)
Beginning of fiscal year	8,680	7,390	$ 7,103
Additions from business combinations	0	1,270	0
Additions for tax positions of the current year	2,027	1,078	762
Additions for tax positions of prior years	519	0	0
Reductions for tax positions of prior years	(633)	(1,058)	(64)
Lapse in statute of limitations	(9)	0	(411)
Settlements	(2,923)	0	0
End of fiscal year	$ 7,661	$ 8,680	$ 7,390

Income Taxes Income Taxes - Nar

Income Taxes Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	$ 112,700,000	$ 7,500,000	$ 7,000,000
Change in U.S. valuation allowance	(67,761,000)	(66,948,000)	(7,080,000)
Expired foreign tax credits	0	407,000	4,766,000
Deferred tax assets, valuation allowance	58,658,000	171,401,000
Deferred tax liabilities, unremitted foreign earnings	0
Unrecognized tax benefits	7,661,000	8,680,000	7,390,000	$ 7,103,000
Unrecognized tax benefits that would impact effective tax rate	1,900,000
Amount of unrecorded benefit	1,000,000
Income tax penalties and interest accrued	500,000	900,000
Net foreign taxable income reported on prior year federal income tax return	34,300,000
Tax Cuts & Jobs Act	800,000
Income tax expense (benefit) (1)	$ (39,460,000)	$ 9,132,000	$ 4,294,000
Macedonia
Operating Loss Carryforwards [Line Items]
Statutory tax rate, percent	0.00%	10.00%	10.00%
THAILAND
Operating Loss Carryforwards [Line Items]
Statutory tax rate, percent	0.00%	20.00%
Valuation Allowance for Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowances and reserves	$ 58,658,000	$ 171,401,000	$ 163,898,000	$ 170,917,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	44,900,000	74,400,000
Operating loss carryforwards	135,300,000
Operating loss carryforwards subject to expiration within one year	0
Foreign Tax Authority | TOKIN
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount		78,200,000
Foreign Tax Authority | Changes in Temporary Differences and Net Operating Utilizations of Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	(35,500,000)
Foreign Tax Authority | Release of Valuation Allowance of Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	$ (5,500,000)
Foreign Tax Authority | Other Foreign Operations
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount		(3,800,000)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount			$ 1,200,000
Other information pertaining to income taxes	227.1
Operating loss carryforwards	$ 114,300,000
Deferred tax assets, valuation allowance	16,900,000
Domestic Tax Authority | TOKIN
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount		(21,100,000)
Domestic Tax Authority | Release of Valuation Allowance of Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	(44,200,000)
Domestic Tax Authority | Operating Loss Carryforwards of Deferred Tax Assets
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount	(26,900,000)
Domestic Tax Authority | Deferred Tax Assets under U.S. Tax Reform
Operating Loss Carryforwards [Line Items]
Valuation allowance, deferred tax asset, increase (decrease), amount		(49,400,000)
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	525,100,000
Operating loss carryforwards subject to expiration within one year	$ 3,600,000
Operating loss carryforwards, expiration period	1 year
Macedonia
Operating Loss Carryforwards [Line Items]
Income tax holiday, aggregate dollar amount	$ 0
Reduction in Taxes [Member]
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit) (1)		$ 800,000

Derivatives Hedging Foreign Cur

Derivatives Hedging Foreign Currencies (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Nov. 07, 2018	Mar. 31, 2018
Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative asset, as presented				$ (1,154)
Mexico, Pesos
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 74,300			70,600
Net Investment Hedging [Member] | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Basis Spread on Variable Rate	6.25%
Net Investment Hedging [Member] | Currency Swap [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, as presented	$ (1,092)			0
Derivative asset, offset	0			0
Net Investment Hedging [Member] | Japan, Yen | Currency Swap Two [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount			$ 33,000,000
Net Investment Hedging [Member] | Japan, Yen | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	31,600,000
Amortization	$ 1,400,000
Derivative, Basis Spread on Variable Rate	2.61%
Net Investment Hedging [Member] | United States of America, Dollars | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 279,700
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative asset, as presented	(1,209)			(1,154)
Derivative asset, offset	645			0
Derivative Asset	564			1,154
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member] | Accrued Expenses
Derivatives, Fair Value [Line Items]
Derivative liability, as presented	645			0
Derivative liability, offset	(645)			0
Derivative Liability	0			0
Fair Value Hedging [Member] | Currency Swap One [Member]
Derivatives, Fair Value [Line Items]
Derivative, Basis Spread on Variable Rate		2.70%
Fair Value Hedging [Member] | Currency Swap Two [Member]
Derivatives, Fair Value [Line Items]
Derivative, Basis Spread on Variable Rate		3.15%
Fair Value Hedging [Member] | Currency Swap [Member] | Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative asset, as presented	(3,485)			0
Derivative asset, offset	0			$ 0
Fair Value Hedging [Member] | Japan, Yen | Currency Swap One [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount			16,500,000
Amortization	$ 1,400,000
Derivative, Basis Spread on Variable Rate	2.00%
Fair Value Hedging [Member] | Japan, Yen | Currency Swap Two [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount			$ 16,500,000
Derivative, Basis Spread on Variable Rate		2.25%
Fair Value Hedging [Member] | Japan, Yen | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 31,600,000
Fair Value Hedging [Member] | United States of America, Dollars | Currency Swap [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 279,700

Derivatives Gain (Loss) on Deri

Derivatives Gain (Loss) on Derivative Instruments Designated as Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	$ (6,383)	$ 0	$ 0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(4,134)	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	6,034	0	0
Currency Swap [Member] | Other Operating Income (Expense) [Member] | Net Investment Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	5,009	0	0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	4,230	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	0	0	0
Foreign Exchange Forward [Member] | Cost of sales | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(1,286)	667	(1,896)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	(698)	2,420	(5,170)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$ 0	$ 0	$ 0

Derivatives Schedule of Fair Va

Derivatives Schedule of Fair Value and Cash Flow Hedges Including in Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Derivative [Line Items]
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	$ 1,100
Other Nonoperating Income (Expense)	(11,214)	$ (24,592)	$ 3,871
Cost of Goods Sold	(924,276)	(860,744)	(571,944)
Other Operating Income (Expense) [Member]
Derivative [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(6,034)	0	0
Gain (Loss) on Fair Value Hedges Recognized in Earnings	1,900	0	0
Cost of sales
Derivative [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net	$ (698)	$ 2,420	$ (5,170)

Supplemental Balance Sheets a_3

Supplemental Balance Sheets and Statements of Operations - Trade Accounts Allowances (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accounts receivable:
Trade	$ 176,715	$ 166,459
Allowance for doubtful accounts reserve	(1,206)	(1,210)
Ship-from-stock and debit (“SFSD”) reserve	(18,862)	(17,362)
Returns reserves (1)	(964)	(131)
Rebates reserves	(967)	(446)
Price protection reserves	(657)	(420)
Other	0	(329)
Accounts receivable	154,059	146,561
Allowance for commitments related to accounts receivables
Changes in allowance for accounts receivable and inventory reserve
Balance at the beginning of the period	19,898	20,414	$ 22,978
Costs charged to expense	99,538	94,660	87,739
Actual adjustments applied	(96,775)	(95,444)	(90,365)
Other	(5)	268	62
Balance at the end of the period	$ 22,656	$ 19,898	$ 20,414

Supplemental Balance Sheets a_4

Supplemental Balance Sheets and Statements of Operations Detail Supplemental Balance Sheets and Statements of Operations - Inventory and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Inventory [Line Items]
Inventory, Raw Materials and Supplies, Gross	$ 97,119	$ 88,408
Inventory, Work in Process, Gross	71,374	65,417
Inventory, Finished Goods, Gross	88,175	66,907
Inventory, Gross	256,668	220,732
Inventory Valuation Reserves	15,539	16,346
Inventory, Net	241,129	204,386
Inventory Valuation Reserve
Inventory [Line Items]
Balance at the beginning of the period	16,346	15,941	$ 16,101
Charged to Cost and Expense	6,019	4,994	6,163
Deductions	6,826	6,954	6,125
Other	0	2,365	(198)
Balance at the end of the period	15,539	$ 16,346	$ 15,941
Inventory Valuation Reserve | TOKIN
Inventory [Line Items]
Balance at the end of the period	$ 1,900

Supplemental Balance Sheets a_5

Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,375,731	$ 1,271,930
Accumulated depreciation	(880,451)	(866,614)
Property, plant and equipment	495,280	405,316
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	62,232	66,150
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	199,319	186,207
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	916,737	895,914
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	82,306	72,811
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	105,857	46,391
Other Capitalized Property Plant and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,280	$ 4,457

Supplemental Balance Sheets a_6

Supplemental Balance Sheets and Statements of Operations - Other Expenses and Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Accrued expenses:
Salaries, wages, and related employee costs	$ 61,880	$ 62,778
Interest Payable, Current	211	396
Restructuring	1,869	8,719
Vacation	10,364	10,364
Anti-trust fines and settlements	9,517	33,696
Revenue Recognition, Sales Returns, Reserve for Sales Returns	2,539	2,485
Accrual for Taxes Other than Income Taxes, Current	1,854	1,571
Other (1)	5,527	5,110
Total accrued expenses	93,761	125,119
Other non-current obligations:
Pension plans	82,717	83,495
Employee separation liability	7,640	8,539
Deferred Compensation Liability, Classified, Noncurrent	2,285	2,057
Customer Deposits, Noncurrent	3,689	3,800
Anti-trust fines and settlements	13,168	35,263
Uncertain tax positions	2,415	5,704
Deferred Rent Credit	5,366	3,840
Return of government subsidies	1,247	4,739
Deferred Interest Income - Customer Capacity Agreements	2,142	0
Restructuring	312	1,240
Other (1)	4,379	3,572
Total other non-current obligations	125,360	152,249
Other (income) expense, net:
Net foreign exchange (gains) losses	(7,230)	13,145	$ (3,758)
Legal fines related to anti-trust class actions	6,701	9,900	0
Post retirement and pension plan non-service costs	366	210	1,256
Insurance proceeds	0	0	(423)
Loss on early extinguishment of debt	15,946	486	0
Revenue from Grants	(4,559)	(787)	0
Other	10	(1,638)	946
Nonoperating Income (Expense)	$ 11,214	$ 24,592	$ (3,871)

Supplemental Balance Sheets a_7

Supplemental Balance Sheets and Statements of Operations Detail Supplemental Balance Sheets and Statements of Operations - Property, Plant and Equipment Useful Life (Phantom)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years	20 years
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	20 years	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	40 years	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years	10 years
Furniture and fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years	4 years
Furniture and fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	10 years	10 years

Income_Loss Per Share - Common

Income/Loss Per Share - Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Numerator
Net income (loss)	$ 93,420	$ 40,806	$ 37,141	$ 35,220	$ 2,280	$ 18,589	$ 12,819	$ 220,439	$ 206,587	$ 254,127	$ 47,157
Weighted-average common shares outstanding:
Weighted Average Number of Shares Issued, Basic									57,840	52,798	46,552
Assumed conversion of employee stock options (in shares)									1,242	2,291	2,235
Assumed conversion of Platinum Warrant (in shares)									0	3,551	6,602
Diluted									59,082	58,640	55,389
Net income (loss) per basic share:
Net income (loss) (in dollars per share)	$ 1.60	$ 0.70	$ 0.64	$ 0.61	$ 0.04	$ 0.33	$ 0.26	$ 4.65	$ 3.57	$ 4.81	$ 1.01
Net income (loss) per diluted share:
Net income (loss) (in dollars per share)	$ 1.58	$ 0.69	$ 0.63	$ 0.60	$ 0.04	$ 0.32	$ 0.22	$ 3.82	$ 3.50	$ 4.33	$ 0.85

Income_Loss Per Share - Commo_2

Income/Loss Per Share - Common Stock Conversion (Details) - shares shares in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Assumed conversion of employee stock grants
Common stock equivalents that could potentially dilute net income per basic share in the future, but were not included in the computation of diluted earnings per share because the impact would have been antidilutive
Common stock equivalents	0	71	771

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) $ in Thousands, € in Millions, ¥ in Millions, R$ in Millions, $ in Millions, $ in Millions, ₩ in Billions

Nov. 30, 2018USD ($)

Nov. 30, 2018KRW (₩)

Jun. 27, 2018USD ($)

Jun. 27, 2018CAD ($)

May 15, 2018item

Mar. 21, 2018USD ($)

Mar. 21, 2018EUR (€)

Mar. 16, 2018USD ($)

Mar. 02, 2018USD ($)

Jan. 31, 2018item

Jul. 29, 2017item

Jan. 31, 2017item

Jul. 29, 2016item

Jul. 26, 2016USD ($)

Jul. 26, 2016BRL (R$)

Jul. 15, 2016USD ($)suititem

Feb. 29, 2016item

Sep. 02, 2015

Jul. 31, 2013defendantsuit

Mar. 31, 2019USD ($)item

Mar. 31, 2019JPY (¥)item

Mar. 31, 2019TWD ($)item

Loss Contingencies [Line Items]

Document Period End Date

Mar. 31, 2019

Mar. 31, 2019

Mar. 31, 2019

Taiwan

Loss Contingencies [Line Items]

Damages sought, value

$ 39,500

$ 1,200

Taiwan | Minimum

Loss Contingencies [Line Items]

Damages sought, value

19,800

$ 609.1

Japan

Loss Contingencies [Line Items]

Litigation settlement, amount

1,100

¥ 127.2

Settled Litigation | Brazil

Loss Contingencies [Line Items]

Damages paid, value

$ 200

R$ 0.6

Equity Method Investments | Indemnification Agreement

Loss Contingencies [Line Items]

Litigation settlement, amount

13,800

Equity Method Investments | Indemnification Agreement | Settled Litigation

Loss Contingencies [Line Items]

Litigation settlement, amount

$ 2,300

Fine, Number of Payment Made to Date | item

4

4

4

Payment period

5 years

Fine, number of payments | item

1

1

1

6

6

6

Lithium Ion Batteries Antitrust Litigation

Loss Contingencies [Line Items]

Number of defendants | defendant

8

Pending claims, number | suit

2

Capacitors Antitrust Litigation

Loss Contingencies [Line Items]

Pending claims, number | suit

2

TOKIN

Loss Contingencies [Line Items]

Loss contingency accrual

$ 37,700

TOKIN | Accounts Payable

Loss Contingencies [Line Items]

Loss contingency accrual

15,000

TOKIN | Accrued Liabilities

Loss Contingencies [Line Items]

Loss contingency accrual

9,500

TOKIN | Other Noncurrent Liabilities [Member]

Loss Contingencies [Line Items]

Loss contingency accrual

13,200

TOKIN | Settled Litigation | CANADA

Loss Contingencies [Line Items]

Damages paid, value

$ 2,200

$ 2.9

TOKIN | Pending Litigation [Member] | Taiwan

Loss Contingencies [Line Items]

Damages paid, value

$ 4,900

$ 152.3

TOKIN | Lithium Ion Batteries Antitrust Litigation

Loss Contingencies [Line Items]

Number of defendants | defendant

1

Litigation settlement, amount

$ 4,950

$ 2,000

TOKIN | Competition Laws of the European Union

Loss Contingencies [Line Items]

Litigation settlement, amount

$ 10,300

€ 8.8

TOKIN | Monopoly and Fair Trade Laws [Member] | KOREA, REPUBLIC OF

Loss Contingencies [Line Items]

Litigation settlement, amount

$ 7,200

₩ 8.1

NEC TOKIN Corporation | Equity Method Investments | Indemnification Agreement

Loss Contingencies [Line Items]

Litigation settlement, amount

$ 37,300

Fine, number of payments | item

1

1

1

5

NEC TOKIN Corporation | Competition Laws of the European Union

Loss Contingencies [Line Items]

Litigation settlement, amount

$ 5,900

€ 5

Commitments and Contingencies_2

Commitments and Contingencies - Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Payments for Rent	$ 2,400
Annual rental expenses for operating leases	13,300	$ 10,700	$ 6,700
Minimum lease payments
2019	10,898
2020	8,536
2021	5,766
2022	5,322
2023	4,080
Thereafter	$ 13,709

Quarterly Results of Operatio_3

Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net sales (1)	$ 355,794	$ 350,175	$ 349,233	$ 327,616	$ 318,091	$ 306,576	$ 301,568	$ 273,946	$ 1,382,818	$ 1,200,181	$ 757,338
Gross Profit	126,406	123,750	113,565	94,821	88,128	92,288	84,904	74,117
Operating income (loss)	54,057	61,616	50,000	35,176	21,646	32,002	31,597	27,607	200,849	112,852	34,968
Net income (loss) (1)	$ 93,420	$ 40,806	$ 37,141	$ 35,220	$ 2,280	$ 18,589	$ 12,819	$ 220,439	$ 206,587	$ 254,127	$ 47,157

Condensed Consolidated Financia

Condensed Consolidated Financial Statements (Details)	May 05, 2010
10.5% Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	10.50%

Subsequent Events (Details)

Subsequent Events (Details) - Chief executive officer - Restricted Stock Units - USD ($) $ in Millions	Apr. 18, 2018	Mar. 31, 2019	Jun. 30, 2018
Subsequent Event [Line Items]
Accelerated compensation cost		$ 0.2	$ 1.7
June 29, 2015
Subsequent Event [Line Items]
Vested (in shares)	175,000
September 6, 2017
Subsequent Event [Line Items]
Vested (in shares)	100,000

Uncategorized Items - kem-20190

Label	Element	Value
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	$ 65,004,000