AVX (AVX) 10-Q 3 Nov 17 2018 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Sep. 30, 2017	Nov. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2017
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,018
Entity Registrant Name	AVX Corp
Entity Central Index Key	859,163
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		168,304,026
Trading Symbol	AVX

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
ASSETS
Cash and cash equivalents	$ 618,789	$ 578,634
Short-term investments in securities	546,625	528,748
Accounts receivable - trade, net	189,870	176,730
Accounts receivable - affiliates	6,674	10,074
Inventories	465,343	474,128
Income taxes receivable	12,331	34,287
Prepaid and other	35,984	33,803
Total current assets	1,875,616	1,836,404
Property and equipment, net	268,075	239,951
Goodwill	213,051	213,051
Intangible assets, net	51,946	53,650
Deferred income taxes - non-current	127,843	124,589
Other assets	13,385	9,768
Total Assets	2,549,916	2,477,413
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable - trade	46,550	43,778
Accounts payable - affiliates	31,621	36,663
Income taxes payable	8,023	3,944
Accrued payroll and benefits	33,943	32,980
Accrued expenses	99,629	98,702
Total current liabilities	219,766	216,067
Pensions	13,230	12,663
Deferred income taxes - non-current	59	957
Other liabilities	32,323	31,247
Total Liabilities	265,378	260,934
Stockholders' Equity:
Preferred stock, par value $.01 per share: Authorized, 20,000 shares; None issued and outstanding
Common stock, par value $.01 per share: Authorized, 300,000 shares; issued, 176,369 shares; outstanding, 167,930 and 168,277 shares at March 31, 2017 and September 30, 2017, respectively	1,764	1,764
Additional paid-in capital	358,575	357,203
Retained earnings	2,062,583	2,033,285
Accumulated other comprehensive loss	(34,250)	(67,163)
Treasury stock, at cost: 8,439 and 8,091 shares at March 31, 2017 and September 30, 2017, respectively	(104,134)	(108,610)
Total Stockholders' Equity	2,284,538	2,216,479
Total Liabilities and Stockholders' Equity	$ 2,549,916	$ 2,477,413

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Mar. 31, 2017
Consolidated Balance Sheets [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	176,369,000	176,369,000
Common stock, shares outstanding	168,277,000	167,930,000
Treasury stock, shares	8,091,000	8,439,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Consolidated Statements of Operations [Abstract]
Net sales	$ 352,693	$ 327,461	$ 684,047	$ 642,284
Cost of sales	275,420	265,662	532,928	510,622
Gross profit	77,273	61,799	151,119	131,662
Selling, general and administrative expenses	32,487	29,047	63,902	60,524
Litigation settlement charges				3,600
Profit from operations	44,786	32,752	87,217	67,538
Other income (expense):
Interest income	5,067	1,684	7,398	3,346
Other, net	(813)	1,045	(1,231)	4,448
Income before income taxes	49,040	35,481	93,384	75,332
Provision for income taxes	14,222	8,961	27,082	18,923
Net income	$ 34,818	$ 26,520	$ 66,302	$ 56,409
Income (loss) per share:
Basic	$ 0.21	$ 0.16	$ 0.39	$ 0.34
Diluted	0.21	0.16	0.39	0.34
Dividends declared per share:	$ 0.115	$ 0.110	$ 0.225	$ 0.215
Weighted average common shares outstanding:
Basic	168,262	167,324	168,167	167,389
Diluted	168,918	167,597	168,754	167,602

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss)
Net income	$ 34,818	$ 26,520	$ 66,302	$ 56,409
Other comprehensive income (loss), net of income taxes
Foreign currency translation adjustment	12,385	6,074	33,447	1,794
Foreign currency cash flow hedges adjustment	267	(8)	(421)	527
Pension liability adjustment	68	(933)	(113)	(780)
Other comprehensive income (loss), net of income taxes	12,720	5,133	32,913	1,541
Comprehensive income	$ 47,538	$ 31,653	$ 99,215	$ 57,950

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating Activities:
Net income	$ 66,302	$ 56,409
Adjustment to reconcile net income to net cash from operating activities:
Depreciation and amortization	21,241	19,643
Stock-based compensation expense	1,727	1,327
Deferred income taxes	746	1,383
Gain on disposal of property and equipment	1	(1,967)
Changes in operating assets and liabilities:
Accounts receivable	(9,291)	(4,783)
Inventories	15,559	12,540
Accounts payable and accrued expenses	(3,035)	10,461
Income taxes payable	(1,373)	(13,513)
Other assets	28,900	15,690
Other liabilities	7,657	7,098
Net cash provided by (used in) operating activities	128,434	104,288
Investing Activities:
Purchases of property and equipment	(38,916)	(27,983)
Purchases of investment securities	(986,710)	(565,252)
Redemptions of investment securities	970,348	575,077
Other investing activities	(969)
Proceeds from property and equipment dispositions	9	9,395
Net cash used in investing activities	(56,238)	(8,763)
Financing Activities:
Dividends paid	(37,004)	(35,157)
Purchase of treasury stock		(4,833)
Proceeds from exercise of stock options	4,121	1,247
Payments of tax withholdings for vested restricted stock units	(498)
Net cash used in financing activities	(33,381)	(38,743)
Effect of exchange rate on cash	1,340	498
Increase (decrease) in cash and cash equivalents	40,155	57,280
Cash and cash equivalents at beginning of period	578,634	454,208
Cash and cash equivalents at end of period	$ 618,789	$ 511,488

Basis of Presentation

Basis of Presentation	6 Months Ended
	Sep. 30, 2017
Basis of Presentation [Abstract]
Basis of Presentation	 1. Basis of Presentation:  The consolidated financial statements of AVX Corporation and its subsidiaries (“AVX” or the “Company”) include all accounts of the Company and its subsidiaries. All significant intercompany transactions and accounts have been eliminated. We have prepared the accompanying financial statements pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial reporting. These consolidated financial statements are unaudited and, in the opinion of management, include all adjustments, consisting of normal recurring adjustments and accruals, necessary for the fair statement of the consolidated balance sheets, operating results, comprehensive income, and cash flows for the periods presented. Operating results for the three and six month periods ended September 30, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2018 due to changes in economic conditions and other factors. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States have been omitted in accordance with the rules and regulations of the SEC. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017.  Critical Accounting Policies and Estimates  We have identified the accounting policies and estimates that are critical to our business operations and understanding our results of operations. Those policies and estimates can be found in Note 1, “Summary of Significant Accounting Policies,” of the Notes to Consolidated Financial Statements and in “Critical Accounting Policies and Estimates,” in “Management's Discussion and Analysis of Financial Condition and Results of Operations” contained in our Annual Report on Form 10-K for the fiscal year ended March 31, 2017. Accordingly, this Quarterly Report on Form 10-Q should be read in conjunction with our Annual Report on Form 10-K for the fiscal year ended March 31, 2017. During the three and six month periods ended September 30, 2017, there were no significant changes to any critical accounting policies or to the methodology used in determining estimates including those related to investment securities, revenue recognition, inventories, goodwill, intangible assets, property and equipment, income taxes, and contingencies.  Relevant New Accounting Standards  In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance modifies how an entity will determine the measurement of revenue and timing of when it is recognized. The guidance provides for a five-step approach in applying the standard: 1) identifying the contract with the customer, 2) identifying separate performance obligations in the contract, 3) determining the transaction price, 4) allocating the transaction price to separate performance obligations, and 5) recognizing the revenue when the performance obligation has been satisfied. The new guidance requires enhanced disclosures for the nature, amount, timing, and uncertainty of revenue that is being recognized. The guidance is effective for public companies for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted for periods beginning after December 15, 2016. Companies may use either a full retrospective or a modified retrospective approach to adopt ASU 2014-09. We are concluding the assessment phase of implementing the new standard and our technical analysis is on-going with respect to variable consideration, disclosures, and methodologies. As we continue our evaluation, we will review our internal control framework over revenue recognition and update for the application of the new guidance. In addition, we are beginning our review of the contract portfolio of our recently-acquired company, the Transportation, Sensing and Control (“TS&C”) division from TT Electronics, PLC, a United Kingdom (U.K.) company, to assess the impact of applying the new standard to current revenue arrangements.  In February 2016, FASB issued ASU 2016-02, “Leases.” This guidance changes the requirements for inclusion of certain right-of-use assets and the associated lease liabilities to be included in a statement of financial position. The classification criteria maintains the distinction between finance leases and operating leases. Regarding finance leases, lessees are required to 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, 2) recognize interest on the lease liability separate from the amortization of the right-of-use asset in the statement of comprehensive income, and 3) classify repayments of the principal portion of the lease liability within financing activities and payments of interest on the lease liability and variable lease payments within operating activities in the statement of cash flows. Regarding operating leases, lessees are required to 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, 2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis, and 3) classify all cash payments within operating activities in the statement of cash flows. This guidance is effective for public companies for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. We previously disclosed that we anticipated no material impact from adopting ASU 2016-02. With our recent purchase of the TS&C business, we will update our assessment to include the impact of the newly-acquired company.  In March 2016, the FASB issued ASU 2016-09, “Compensation — Stock Compensation.” The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. The guidance is effective for public companies for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. The standard became effective for the interim reporting period ending June 30, 2017 and has not had a material impact on our consolidated financial statements.  In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other.” This guidance simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of goodwill. Instead, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This ASU also removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment, and if it fails that qualitative test to perform Step 2 of the goodwill impairment test. Companies are to apply the standard on a prospective basis. The guidance is effective for public companies that are an SEC filer for fiscal years beginning after December 15, 2019. Early adoption is permitted and management elected to adopt this guidance beginning with the interim period ending June 30, 2017. The adoption of this standard has not had a material impact on our consolidated financial statements.  In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging.” The standard aims to align the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results for cash flow and fair value hedge accounting with risk management activities. The guidance is effective for public companies for annual reporting periods beginning after December 15, 2018, and interim periods within those annual periods. Early adoption is permitted in any interim period after issuance. Management is currently evaluating the impact this guidance will have on our consolidated financial statements.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	2. Earnings Per Share:  Basic earnings per share are computed by dividing net earnings by the weighted average number of shares of common stock outstanding for the period. Diluted earnings per share are computed by dividing net earnings by the sum of (a) the weighted average number of shares of common stock outstanding during the period and (b) the dilutive effect of potential common stock equivalents during the period. Equity awards are the only common stock equivalents currently used in our calculation and are computed using the treasury stock method.  The table below represents the basic and diluted earnings per share and sets forth the weighted average number of shares of common stock outstanding and potential common stock equivalents:    Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Net income $ 26,520 $ 34,818 $ 56,409 $ 66,302  Computation of Basic EPS:  Weighted Average Shares Outstanding used in Computing Basic EPS 167,324 168,262 167,389 168,167  Basic earnings per share $ 0.16 $ 0.21 $ 0.34 $ 0.39  Computation of Diluted EPS:  Weighted Average Shares Outstanding used in Computing Basic EPS 167,324 168,262 167,389 168,167  Effect of stock options 273 656 213 587  Weighted Average Shares used in Computing Diluted EPS (1) 167,597 168,918 167,602 168,754  Diluted earnings per share $ 0.16 $ 0.21 $ 0.34 $ 0.39  (1) Common stock equivalents not included in the computation of diluted earnings per share because the impact would have been antidilutive were 1,966 shares and no shares for the three months ended September 30, 2016 and 2017, respectively and 2,230 shares and 94 shares for the six months ended September 30, 2016 and 2017, respectively.

Trade Accounts Receivable

Trade Accounts Receivable	6 Months Ended
	Sep. 30, 2017
Trade Accounts Receivable [Abstract]
Trade Accounts Receivable	3. Trade Accounts Receivable:   March 31, 2017 September 30, 2017  Gross Accounts Receivable - Trade $ 198,491 $ 210,666  Less:  Allowances for doubtful accounts 1,285 601  Stock rotation and ship from stock and debit 14,853 15,119  Sales returns and discounts 5,623 5,076  Total allowances 21,761 20,796  $ 176,730 $ 189,870   Charges related to allowances for doubtful accounts are charged to selling, general and administrative expenses. Charges related to stock rotation, ship from stock and debit, sales returns, and sales discounts are reported as deductions from revenue.    Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Allowances for doubtful accounts:  Beginning Balance $ 449 $ 1,447 $ 423 $ 1,285  Charges 711 - 737 164  Applications - (846) - (848)  Ending Balance $ 1,160 $ 601 $ 1,160 $ 601     Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Stock rotation and ship from stock and debit:  Beginning Balance $ 17,048 $ 14,893 $ 14,314 $ 14,853  Charges 6,756 7,527 14,287 14,266  Applications (5,001) (7,301) (9,798) (14,000)  Ending Balance $ 18,803 $ 15,119 $ 18,803 $ 15,119     Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Sales returns and discounts:  Beginning Balance $ 7,630 $ 5,163 $ 6,681 $ 5,623  Charges 3,575 2,715 7,381 6,780  Applications (5,075) (2,819) (7,919) (7,372)  Translation and other 8 17 (5) 45  Ending Balance $ 6,138 $ 5,076 $ 6,138 $ 5,076                

Fair Value

Fair Value	6 Months Ended
	Sep. 30, 2017
Fair Value [Abstract]
Fair Value	4. Fair Value: Fair Value Hierarchy: The fair value framework requires the categorization of assets and liabilities into three levels based upon the assumptions (inputs) used to value the assets or liabilities. Level 1 provides the most reliable measure of fair value, whereas Level 3 generally requires significant management judgment. The three levels are defined as follows: - Level 1 : Unadjusted quoted prices in active markets for identical assets and liabilities.  - Level 2 : Observable inputs other than those included in Level 1. For example, quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in inactive markets.  - Level 3 : Unobservable inputs reflecting management’s own assumptions about the inputs used in pricing the asset or liability.  During the three and six month periods ended September 30, 2016 and 2017, there have been no transfers of assets or liabilities between levels within the fair value hierarchy.     Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  March 31, 2017 (Level 1) (Level 2) (Level 3)  Assets measured at fair value on a recurring basis:  Assets held in the non-qualified deferred compensation program (1) $ 6,082 $ 4,810 $ 1,272 $ -  Foreign currency derivatives (2) 1,492 - 1,492 -  Total $ 7,574 $ 4,810 $ 2,764 $ -      Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  March 31, 2017 (Level 1) (Level 2) (Level 3)  Liabilities measured at fair value on a recurring basis:  Obligation related to assets held in the non-qualified deferred compensation program (1) $ 6,082 $ 4,810 $ 1,272 $ -  Foreign currency derivatives (2) 886 - 886 -  Total $ 6,968 $ 4,810 $ 2,158 $ -       Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  September 30, 2017 (Level 1) (Level 2) (Level 3)  Assets measured at fair value on a recurring basis:  Assets held in the non-qualified deferred compensation program (1) $ 6,702 $ 5,529 $ 1,173 $ -  Foreign currency derivatives (2) 852 - 852 -  Total $ 7,554 $ 5,529 $ 2,025 $ -       Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  September 30, 2017 (Level 1) (Level 2) (Level 3)  Liabilities measured at fair value on a recurring basis:  Obligation related to assets held in the non-qualified deferred compensation program (1) $ 6,702 $ 5,529 $ 1,173 $ -  Foreign currency derivatives (2) 1,344 - 1,344 -  Total $ 8,046 $ 5,529 $ 2,517 $ -   (1) The market value of the assets held in the trust for the non-qualified deferred compensation program is included as an asset and as a liability as the trust’s assets are both assets of the Company and also a liability as they are available to general creditors in certain circumstances.  (2) Foreign currency derivatives in the form of forward contracts are included in prepaid and other assets or accrued expenses in the consolidated balance sheets. Unrealized gains and losses on derivatives classified as cash flow hedges are recorded in other comprehensive income (loss). Realized gains and losses on derivatives classified as cash flow hedges and gains and losses on derivatives not designated as hedges are recorded in other income.  Valuation Techniques:  The following describes valuation techniques used to appropriately value our assets held in the non-qualified deferred compensation plan and derivatives.  Assets held in the non-qualified deferred compensation plan  Assets valued using Level 1 and Level 2 inputs in the table above represent assets from our non-qualified deferred compensation program. The funds in the non-qualified deferred compensation program are valued based on the number of shares in the funds using a price per share traded in an active market.  Investments are considered to be impaired when a decline in fair value is judged to be other-than-temporary. If the cost of an investment exceeds its fair value, among other factors, we evaluate general market conditions, the duration and extent to which the fair value is less than cost, and whether or not we expect to recover the security's entire amortized cost. Once a decline in fair value is determined to be other-than-temporary, an impairment charge is recorded and a new cost basis in the investment is established.  Derivatives  We primarily use forward contracts, with maturities generally less than four months, designated as cash flow hedges, to protect against the foreign currency exchange rate risks inherent in our forecasted transactions related to purchase commitments and sales, denominated in various currencies. We also use derivatives not designated as hedging instruments to hedge foreign currency balance sheet exposures. These derivatives are used to offset currency changes in the fair value of the hedged assets and liabilities. Fair values for all of our derivative financial instruments are valued by adjusting the market spot rate by forward points, based on the date of the contract. The spot rates and forward points used are an average rate from an actively traded market. At March 31, 2017 and September 30, 2017, all of our forward contracts are valued using Level 2 measurements.

Financial Instruments and Inves

Financial Instruments and Investments in Securities	6 Months Ended
	Sep. 30, 2017
Financial Instruments and Investments in Securities [Abstract]
Financial Instruments and Investments in Securities	5. Financial Instruments and Investments in Securities:  At March 31, 2017 and September 30, 2017, we classified investments in debt securities and time deposits as held-to-maturity securities.  Our long-term and short-term investment securities are accounted for as held-to-maturity securities and are carried at amortized cost. We have the ability and intent to hold these investments until maturity. All income generated from the held-to-maturity securities investments are recorded as interest income.   Investments in held-to-maturity securities, recorded at amortized cost, were as follows:     March 31, 2017  Gross Gross  Unrealized Unrealized Estimated  Cost Gains Losses Fair Value  Short-term investments:  Corporate bonds $ 10,120 $ - $ (1) $ 10,119  Time deposits 518,628 148 - 518,776  $ 528,748 $ 148 $ (1) $ 528,895      September 30, 2017  Gross Gross  Unrealized Unrealized Estimated  Cost Gains Losses Fair Value  Short-term investments:  Commercial paper $ 74,912 $ 148 $ - $ 75,060  Time deposits 471,713 118 - 471,831  $ 546,625 $ 266 $ - $ 546,891   The amortized cost and estimated fair value of held-to-maturity investments at September 30, 2017, by contractual maturity, are shown below. The estimated fair value of these investments are based on valuation inputs that include benchmark yields, reported trades, broker and dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers, and reference data, which are Level 2 inputs in the fair value hierarchy. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations without call or prepayment penalties.    Held-to-Maturity  Amortized Estimated  Cost Fair Value  Due in one year or less $ 546,625 $ 546,891  Due after one year through five years - -  Total $ 546,625 $ 546,891  

Inventories

Inventories	6 Months Ended
	Sep. 30, 2017
Inventories [Abstract]
Inventories	6. Inventories:   March 31, 2017 September 30, 2017  Finished goods $ 92,563 $ 91,373  Work in process 107,392 108,016  Raw materials and supplies 274,173 265,954  $ 474,128 $ 465,343  

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Sep. 30, 2017
Commitments and Contingencies [Abstract]
Commitments and Contingencies	7 . Commitments and Contingencies:  We have been identified by the United States Environmental Protection Agency (“EPA”), state governmental agencies or other private parties as a potentially responsible party (“PRP”) under the Comprehensive Environmental Response, Compensation and Liability Act (“CERCLA”), or equivalent state or local laws, for clean-up and response costs associated with certain sites at which remediation is required with respect to prior contamination. Because CERCLA or such state statutes authorize joint and several liability, the EPA or state regulatory authorities could seek to recover all clean-up costs from any one of the PRPs at a site despite the involvement of other PRPs. At certain sites, financially responsible PRPs other than AVX also are, or have been, involved in site investigation and clean-up activities. We believe that liability resulting from these sites will be apportioned between AVX and other PRPs.  To resolve our liability at the sites at which we have been named a PRP, we have entered into various administrative orders and consent decrees with federal and state regulatory agencies governing the timing and nature of investigation and remediation. As is customary, the orders and decrees regarding sites where the PRPs are not themselves implementing the chosen remedy contain provisions allowing the EPA to reopen the agreement and seek additional amounts from settling PRPs in the event that certain contingencies occur, such as the discovery of significant new information about site conditions.  On June 3, 2010, AVX entered into an agreement with the EPA and the City of New Bedford, pursuant to which AVX is required to perform environmental remediation at a site referred to as the “Aerovox Site” (the “Site”), located in New Bedford, Massachusetts. AVX has substantially completed its obligations pursuant to such agreement with the EPA and the City of New Bedford with respect to the satisfaction of AVX’s federal law requirements. The Massachusetts Department of Environmental Protection has jurisdiction over the balance of the environmental remediation at the Site. AVX has submitted its proposed remedy, but until the state has approved such proposal, AVX cannot determine if additional groundwater and soil remediation will be required, if substantial material will have to be disposed of offsite, or if additional remediation techniques will be required, any of which could result in a more extensive and costly plan of remediation. Further, the Site and the remediation may be subject to additional scrutiny under other statutory procedures which could also add to the cost of remediation. We have a remaining accrual of $14,328 at September 30, 2017, representing our current estimate of the potential liability related to the remaining performance of environmental remediation actions at the Site and neighboring properties using certain assumptions regarding the plan of remediation. Until all parties agree and remediation is complete, we cannot be certain there will be no additional cost relating to the Site.  We had total reserves of approximately $ 19,181 and $ 18,855 at March 31, 2017 and September 30, 2017 , respectively, related to various environmental matters and sites, including those discussed above. These reserves are classified in the Consolidated Balance Sheets as $ 3,892 and $ 3,566 in accrued expenses at March 31, 2017 and September 30, 2017, respectively, and $ 15,289 in other non-current liabilities at both March 31, 2017 and September 30, 2017. The amounts recorded for identified environmental liabilities are based on estimates. Periodically we review amounts recorded and adjust them to reflect additional legal and technical information that becomes available. Uncertainties about the status of laws, regulations, regulatory actions, technology, and information related to individual sites make it difficult to develop an estimate of the reasonably possible aggregate environmental remediation exposure. Accordingly, these costs could differ from our current estimates.  On April 19, 2016, the Canadian Ministry of the Environment and Climate Change (the “MoE”) issued a Director’s Order naming AVX Corporation, and others, as responsible parties with respect to a location in Hamilton, Ontario that was at one time the site of operations of Aerovox Canada, a former subsidiary of Aerovox Corporation, a predecessor of AVX. This Director’s Order follows a draft order issued on November 4, 2015. AVX has taken the position that any liability of Aerovox Canada for such site under the laws of Canada cannot be imposed on AVX. At present, it is unclear whether the MoE will seek to enforce such Canadian order against AVX, and whether, in the event it does so, AVX will have any liability under applicable law. AVX intends to contest any such course of action that may be taken by the MoE.  We also operate, or did at one time, on other sites that may have potential future environmental issues as a result of activities at sites during AVX’s long history of manufacturing operations or prior to the start of operations by AVX. Even though we may have rights of indemnity for such environmental matters at certain sites, regulatory agencies in those jurisdictions may require us to address such issues. Once it becomes probable that we will incur costs in connection with remediation of a site and such costs can be reasonably estimated, we establish reserves or adjust our reserves for our projected share of these costs. A separate account receivable is recorded for any indemnified costs. Our environmental reserves are not discounted and do not reflect any possible future insurance recoveries, which are not expected to be significant, but do reflect a reasonable estimate of cost sharing at multiple party sites or indemnification of our liability by a third party.  On April 25, 2013, AVX was named as a defendant in a patent infringement case filed in the United States District Court for the District of Delaware captioned Greatbatch, Inc. v. AVX Corporation . This case alleged that certain AVX products infringe on one or more of six Greatbatch patents. On January 26, 2016, the jury returned a verdict in favor of the plaintiff in the first phase of a segmented trial and a mixed verdict in the second phase of a segmented trial, and found damages to Greatbatch in the amount of $37,500 . The results of the third trial have not yet been issued by the District Judge. AVX is continuing to litigate the rest of the case.  On September 2, 2014, a subsidiary of AVX, American Technical Ceramics (“ATC”), was named as a defendant in a patent infringement case filed in the United States District Court of the District of Southern California captioned Presidio Components, Inc. v. American Technical Ceramics Corp. This case alleged that certain ATC products infringe on a Presidio patent. On April 18, 2016, the jury returned a verdict in favor of the plaintiff and found damages to Presidio in the amount of $2,168 . On August 17, 2016, the court issued a permanent injunction prohibiting ATC from manufacturing or selling the related products after November 16, 2016. Subsequently, on October 21, 2016, the Federal Circuit Court granted AVX’s request for a stay of the permanent injunction whereby AVX was allowed to continue to sell the disputed product until March 17, 2017 to anyone who was a customer prior to June 17, 2016. Any sales subsequent to November 16, 2016 pursuant to the stay of the permanent injunction are subject to court mandated intellectual property damages for each product sold. Accordingly, in addition to the $2,168 jury verdict award above, we recorded an estimated reserve for damages on all pre- and post-verdict sales of product subject to that litigation in the event that the verdict withstands future challenges. As of September 30, 2017, we have reserved $34,891 related to the pre- and post-verdict sales of such product. On September 1, 2016, we filed an appeal with the Federal Circuit to appeal this verdict; that appeal is fully argued and we are awaiting the results.  We had total reserves of $74,559 plus accrued interest in accrued expenses as of March 31, 2017 and September 30, 2017, with respect to the two intellectual property cases discussed above. The amounts recorded are based on estimated outcomes. Amounts recorded are reviewed periodically and adjusted to reflect additional information that becomes available. Accordingly, these costs could differ from our current estimates.  During calendar year 2014, AVX was named as a co-defendant in a series of cases filed in the United States and in the Canadian provinces of Quebec, Ontario, British Columbia, Saskatchewan and Manitoba alleging violations of United States, state and Canadian antitrust laws asserting that AVX and numerous other companies were participants in alleged price-fixing in the capacitor market. The cases in the United States were consolidated into the Northern District of California on October 2, 2014. Some plaintiffs have broken off from the United States class action and filed actions on their own. These cases are still in progress. AVX believes it has meritorious defenses and intends to vigorously defend the cases.  We are involved in other disputes, warranty, and legal proceedings arising in the normal course of business. While we cannot predict the outcome of these other disputes and proceedings, we believe, based upon a review with legal counsel, that none of these disputes or proceedings will have a material impact on our financial position, results of operations, comprehensive income (loss), or cash flows. However, we cannot be certain of the eventual outcome in these or other matters that may arise and their potential impact on our financial position, results of operations, comprehensive income (loss), or cash flows.

Comprehensive Income (Loss)

Comprehensive Income (Loss)	6 Months Ended
	Sep. 30, 2017
Comprehensive Income (Loss) [Abstract]
Comprehensive Income (Loss)	 8. Comprehensive Income (Loss):  Comprehensive income (loss) represents changes in equity during a period except those resulting from investments by and distributions to shareholders. The specific components include net income, pension liability and other post-retirement benefit adjustments, deferred gains and losses resulting from foreign currency translation adjustments and unrealized gains and losses on qualified foreign currency cash flow hedges.  Other comprehensive income (loss) includes the following components:     Three Months Ended  September 30,  2016 2017  Pre-tax Net of Tax Pre-tax Net of Tax  Foreign currency translation adjustment $ 6,074 $ 6,074 $ 12,385 $ 12,385  Foreign currency cash flow hedges adjustment 20 (8) 195 267  Pension liability adjustment (1,259) (933) 91 68  Other comprehensive income (loss) $ 4,835 $ 5,133 $ 12,671 $ 12,720        Six Months Ended  September 30,  2016 2017  Pre-tax Net of Tax Pre-tax Net of Tax  Foreign currency translation adjustment $ 1,794 $ 1,794 $ 33,447 $ 33,447  Foreign currency cash flow hedges adjustment 621 527 (524) (421)  Pension liability adjustment (1,034) (780) (150) (113)  Other comprehensive income (loss) $ 1,381 $ 1,541 $ 32,773 $ 32,913   Amounts reclassified out of accumulated other comprehensive income (loss) into net income include those that pertain to the Company’s pension and postretirement benefit plans and realized gains and losses on derivative instruments designated as cash flow hedges. Please see Note 10 for additional information related to the amortization of prior service cost and the recognized actuarial losses, which amounts are reclassified from accumulated other comprehensive income (loss) into net income and are included in selling, general and administrative expenses in the statement of operations during the three and six month periods ended September 30, 2016 and 2017. Please see Note 11 for additional information related to realized gains and losses on derivative instruments reclassified from accumulated other comprehensive income (loss) into net income during the three and six month periods ended September 30, 2016 and 2017.

Segment and Geographic Informat

Segment and Geographic Information	6 Months Ended
	Sep. 30, 2017
Segment and Geographic Information [Abstract]
Segment and Geographic Information	9. Segment and Geographic Information:  Our operating segments are based on the types of products from which we generate revenues. We are organized into a product line organization with five main product groups and three reportable segments. Our five main product groups are: Ceramic Components, Tantalum Components, Advanced Components, AVX Interconnect, and Kyocera Electronic Devices. The reportable segments are: Passive Components, AVX Interconnect, and KED Resale. The product groups of Ceramic, Advanced, and Tantalum Components have been aggregated into the Passive Components reportable segment in accordance with the SEC’s aggregation criteria and quantitative thresholds. The aggregation criteria consist of similar economic characteristics, products and services, production processes, customer classes, and distribution channels. The Passive Components segment consists primarily of surface mount and leaded ceramic capacitors, RF thick and thin film components, surface mount and leaded tantalum capacitors, surface mount and leaded film capacitors, ceramic and film power capacitors, super capacitors, EMI filters (bolt in and surface mount), thick and thin film packages of multiple passive integrated components, varistors, thermistors, inductors, and resistive products manufactured by us or purchased from other manufacturers for resale. The AVX Interconnect segment consists primarily of automotive, telecom, and memory connectors manufactured by or for AVX. The KED Resale segment consists primarily of ceramic capacitors, frequency control devices, SAW devices, sensor products, RF modules, actuators, acoustic devices, and connectors produced by Kyocera and resold by AVX. Sales and operating results from these reportable segments are shown in the tables below. In addition, we have a corporate administration group consisting of finance, legal, environmental, health & safety (“EH&S”), and administrative activities.  We evaluate performance of our segments based upon sales and operating profit. There are no intersegment revenues. We allocate the costs of shared resources between segments based on each segment ’ s usage of the shared resources. Cash, accounts receivable, investments in securities, and certain other assets, which are centrally managed, are not readily allocable to operating segments.  The tables below present information about reported segments:      Three Months Ended Six Months Ended  September 30, September 30,  Sales Revenue: 2016 2017 2016 2017  Ceramic Components $ 46,432 $ 57,319 $ 96,555 $ 108,375  Tantalum Components 78,600 93,987 156,131 182,940  Advanced Components 89,112 83,601 172,407 168,530  Total Passive Components 214,144 234,907 425,093 459,845  AVX Interconnect 29,170 32,577 59,657 62,261  KCP Resale Connectors 7,755 9,439 14,582 18,143  KDP and KCD Resale 76,392 75,770 142,952 143,798  Total KED Resale 84,147 85,209 157,534 161,941  Total Revenue $ 327,461 $ 352,693 $ 642,284 $ 684,047      Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Operating profit:  Passive Components $ 41,428 $ 51,300 $ 87,060 $ 101,530  AVX Interconnect 4,525 3,366 9,743 6,644  KED Resale 5,115 4,776 9,599 9,265  Corporate activities (18,316) (14,656) (38,864) (30,222)  Total $ 32,752 $ 44,786 $ 67,538 $ 87,217     As of As of  March 31, 2017 September 30, 2017  Assets:  Passive Components $ 573,519 $ 612,479  AVX Interconnect 56,295 74,159  KED Resale 35,164 29,777  Cash, A/R, and investments in securities 1,294,129 1,361,958  Goodwill - Passive components 202,774 202,774  Goodwill - AVX Interconnect 10,277 10,277  Corporate activities 305,255 258,492  Total $ 2,477,413 $ 2,549,916   The following geographic data is based upon net sales generated by operations located within particular geographic are as. Substantially all of the sales in the Americas region were generated in the United States.    Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Net sales:  Americas $ 92,946 $ 102,838 $ 185,802 $ 202,779  Europe 86,596 103,045 175,679 195,565  Asia 147,919 146,810 280,803 285,703  Total $ 327,461 $ 352,693 $ 642,284 $ 684,047                   

Pension Plans

Pension Plans	6 Months Ended
	Sep. 30, 2017
Pension Plans [Abstract]
Pension Plans	10. Pension Plans:  Net periodic pension cost for our defined benefit plans consisted of the following for the three and six month periods ended September 30, 2016 and 2017:     U.S. Plans International Plans  Three Months Ended Three Months Ended  September 30, September 30,  2016 2017 2016 2017  Service cost $ 42 $ 33 $ 233 $ 231  Interest cost 364 352 1,152 1,136  Expected return on plan assets (445) (450) (1,458) (1,450)  Recognized actuarial loss 456 286 311 329  Net periodic pension cost $ 417 $ 221 $ 238 $ 246         U.S. Plans International Plans  Six Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Service cost $ 84 $ 66 $ 467 $ 459  Interest cost 728 704 2,405 2,244  Expected return on plan assets (890) (900) (3,045) (2,867)  Recognized actuarial loss 912 571 650 650  Net periodic pension cost $ 834 $ 441 $ 477 $ 486   Based on current actuarial computations, during the six months ended September 30, 2017, we made contributions of $ 3,095 to the international plans. We expect to make additional contributions of approximately $ 3,073 to the international plans over the remainder of fiscal 2018. We made $261 in contributions to the U.S. plans during the six months ended September 30, 2017. We do no t anticipate making additional contributions to the U.S. plans over the remainder of the fiscal year.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Sep. 30, 2017
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	11. Derivative Financial Instruments:  We are exposed to foreign currency exchange rate fluctuations in the normal course of business. We use derivative instruments (forward contracts) to hedge certain foreign currency exposures as part of our risk management strategy. The objective is to offset gains and losses resulting from these exposures with gains and losses on the forward contracts used to hedge them, thereby reducing volatility of earnings or protecting fair values of assets and liabilities. We do not enter into any trading or speculative positions with regard to derivative instruments.  We primarily use forward contracts, with maturities less than four months, designated as cash flow hedges to protect against the foreign currency exchange rate risks inherent in our forecasted transactions related to purchase commitments and sales, denominated in various currencies. These derivative instruments are designated and qualify as cash flow hedges.  The effectiveness of the cash flow hedges is determined by comparing the cumulative change in the fair value of the hedge contract with the cumulative change in the fair value of the hedged transaction, both of which are based on forward rates. The effective portion of the gain or loss on these cash flow hedges is initially recorded in accumulated other comprehensive income (loss) as a separate component of stockholders’ equity. Once the hedged transaction is recognized, the gain or loss is recognized in our statement of operations. At March 31, 2017 and September 30, 2017, respectively, the following forward contracts were entered into to hedge against the volatility of foreign currency exchange rates for certain forecasted sales and purchases.     March 31, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 1,151 Accrued expenses $ 690      September 30, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 807 Accrued expenses $ 871    For these derivatives designated as cash flow hedging instruments, during the three and six month periods ended September 30, 2017, net pre-tax losses of $ (1,565) and $(813) , respectively, were recognized in other comprehensive income. In addition, during the three and six month periods ended September 30, 2017, net pre-tax gains of $ 1,368 and $2,413 , respectively, were reclassified from accumulated other comprehensive income into cost of sales (for hedging purchases), and net pretax losses of $ (1,596) and $ (2,017) , respectively, were reclassified from accumulated other comprehensive income into sales (for hedging sales) in the accompanying statement of operations.  Derivatives not designated as cash flow hedging instruments consist primarily of forwards used to hedge foreign currency balance sheet exposures. These hedging instruments are used to offset foreign currency changes in the fair values of the underlying assets and liabilities. The gains and losses on these foreign currency forward contracts are recognized in other income in the same period as the remeasurement gains and losses of the related foreign currency denominated assets and liabilities and thus naturally offset these gains and losses. At March 31, 2017 and September 30, 2017, we had the following forward contracts that were entered into to hedge against these exposures.    March 31, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 341 Accrued expenses $ 196      September 30, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 45 Accrued expenses $ 473   For these derivatives not designated as cash flow hedging instruments during the three and six month periods ended September 30, 2017, losses of $ (395) and $(877) , respectively on hedging contracts were recognized in other income, along with the approximately $ (762) and $(1,324) , respectively, in exchange losses that were recognized in other income in the accompanying statement of operations.  At March 31, 2017 and September 30, 2017, we had outstanding foreign exchange contracts with notional amounts totaling $ 193,156 and $ 247,513 , respectively, denominated primarily in Euros, Czech Korunas, British Pounds, and Japanese Yen.

Subsequent Events

Subsequent Events	6 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events:  On October 19, 2017 , the Board of Directors of the Company declared a $ 0.115 dividend per share of common stock with respect to the quarter ended September 30, 2017. The dividend will be paid to stockholders of record on November 2, 2017 and will be disbursed on November 16, 2017 .  On October 2, 2017 , A VX Corporation announced it had completed the acquisition of the TS&C division of TT Electronics, PLC, a United Kingdom (U.K.) Company, for approximately $156.0 million in cash. The purchase comprises TS&C’s manufacturing subsidiaries located in Austria, China, Germany, India, Mexico, Romania, South Korea, the U.K., and the U.S., including R&D, manufacturing and sales office locations. The transaction is subject to customary post-closing adjustments based on the actual net debt and actual working capital of the target companies. For additional information about this transaction, see the Company’s Current Report on Form 8-K, filed with the Securities and Exchange Commission on October 2, 2017, and Exhibit 10.2 of Form 10-Q for the quarter ended June 30, 2017.

Basis of Presentation (Policy)

Basis of Presentation (Policy)	6 Months Ended
	Sep. 30, 2017
Basis of Presentation [Abstract]
New Accounting Standards	In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers.” This guidance modifies how an entity will determine the measurement of revenue and timing of when it is recognized. The guidance provides for a five-step approach in applying the standard: 1) identifying the contract with the customer, 2) identifying separate performance obligations in the contract, 3) determining the transaction price, 4) allocating the transaction price to separate performance obligations, and 5) recognizing the revenue when the performance obligation has been satisfied. The new guidance requires enhanced disclosures for the nature, amount, timing, and uncertainty of revenue that is being recognized. The guidance is effective for public companies for interim and annual reporting periods beginning after December 15, 2017. Early adoption is permitted for periods beginning after December 15, 2016. Companies may use either a full retrospective or a modified retrospective approach to adopt ASU 2014-09. We are concluding the assessment phase of implementing the new standard and our technical analysis is on-going with respect to variable consideration, disclosures, and methodologies. As we continue our evaluation, we will review our internal control framework over revenue recognition and update for the application of the new guidance. In addition, we are beginning our review of the contract portfolio of our recently-acquired company, the Transportation, Sensing and Control (“TS&C”) division from TT Electronics, PLC, a United Kingdom (U.K.) company, to assess the impact of applying the new standard to current revenue arrangements.  In February 2016, FASB issued ASU 2016-02, “Leases.” This guidance changes the requirements for inclusion of certain right-of-use assets and the associated lease liabilities to be included in a statement of financial position. The classification criteria maintains the distinction between finance leases and operating leases. Regarding finance leases, lessees are required to 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, 2) recognize interest on the lease liability separate from the amortization of the right-of-use asset in the statement of comprehensive income, and 3) classify repayments of the principal portion of the lease liability within financing activities and payments of interest on the lease liability and variable lease payments within operating activities in the statement of cash flows. Regarding operating leases, lessees are required to 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position, 2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis, and 3) classify all cash payments within operating activities in the statement of cash flows. This guidance is effective for public companies for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. We previously disclosed that we anticipated no material impact from adopting ASU 2016-02. With our recent purchase of the TS&C business, we will update our assessment to include the impact of the newly-acquired company.  In March 2016, the FASB issued ASU 2016-09, “Compensation — Stock Compensation.” The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including the income tax impact, classification on the statement of cash flows and forfeitures. The guidance is effective for public companies for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. The standard became effective for the interim reporting period ending June 30, 2017 and has not had a material impact on our consolidated financial statements.  In January 2017, the FASB issued ASU 2017-04, “Intangibles – Goodwill and Other.” This guidance simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit’s goodwill with the carrying amount of goodwill. Instead, an entity should perform its annual, or interim, goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount and recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. This ASU also removes the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment, and if it fails that qualitative test to perform Step 2 of the goodwill impairment test. Companies are to apply the standard on a prospective basis. The guidance is effective for public companies that are an SEC filer for fiscal years beginning after December 15, 2019. Early adoption is permitted and management elected to adopt this guidance beginning with the interim period ending June 30, 2017. The adoption of this standard has not had a material impact on our consolidated financial statements.  In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging.” The standard aims to align the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results for cash flow and fair value hedge accounting with risk management activities. The guidance is effective for public companies for annual reporting periods beginning after December 15, 2018, and interim periods within those annual periods. Early adoption is permitted in any interim period after issuance. Management is currently evaluating the impact this guidance will have on our consolidated financial statements.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Basic and diluted weighted average number of shares of common stock and potential common stock equivalents	   Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Net income $ 26,520 $ 34,818 $ 56,409 $ 66,302  Computation of Basic EPS:  Weighted Average Shares Outstanding used in Computing Basic EPS 167,324 168,262 167,389 168,167  Basic earnings per share $ 0.16 $ 0.21 $ 0.34 $ 0.39  Computation of Diluted EPS:  Weighted Average Shares Outstanding used in Computing Basic EPS 167,324 168,262 167,389 168,167  Effect of stock options 273 656 213 587  Weighted Average Shares used in Computing Diluted EPS (1) 167,597 168,918 167,602 168,754  Diluted earnings per share $ 0.16 $ 0.21 $ 0.34 $ 0.39  (1) Common stock equivalents not included in the computation of diluted earnings per share because the impact would have been antidilutive were 1,966 shares and no shares for the three months ended September 30, 2016 and 2017, respectively and 2,230 shares and 94 shares for the six months ended September 30, 2016 and 2017, respectively.

Trade Accounts Receivable (Tabl

Trade Accounts Receivable (Tables)	6 Months Ended
	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade Accounts Receivable	  March 31, 2017 September 30, 2017  Gross Accounts Receivable - Trade $ 198,491 $ 210,666  Less:  Allowances for doubtful accounts 1,285 601  Stock rotation and ship from stock and debit 14,853 15,119  Sales returns and discounts 5,623 5,076  Total allowances 21,761 20,796  $ 176,730 $ 189,870 
Allowances for Doubtful Accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	   Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Allowances for doubtful accounts:  Beginning Balance $ 449 $ 1,447 $ 423 $ 1,285  Charges 711 - 737 164  Applications - (846) - (848)  Ending Balance $ 1,160 $ 601 $ 1,160 $ 601 
Stock Rotation And Ship From Stock And Debit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	  Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Stock rotation and ship from stock and debit:  Beginning Balance $ 17,048 $ 14,893 $ 14,314 $ 14,853  Charges 6,756 7,527 14,287 14,266  Applications (5,001) (7,301) (9,798) (14,000)  Ending Balance $ 18,803 $ 15,119 $ 18,803 $ 15,119 
Sales Returns And Discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	  Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Sales returns and discounts:  Beginning Balance $ 7,630 $ 5,163 $ 6,681 $ 5,623  Charges 3,575 2,715 7,381 6,780  Applications (5,075) (2,819) (7,919) (7,372)  Translation and other 8 17 (5) 45  Ending Balance $ 6,138 $ 5,076 $ 6,138 $ 5,076  

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Sep. 30, 2017
Fair Value [Abstract]
Assets and liabilities measured at fair value on a recurring basis	   Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  March 31, 2017 (Level 1) (Level 2) (Level 3)  Assets measured at fair value on a recurring basis:  Assets held in the non-qualified deferred compensation program (1) $ 6,082 $ 4,810 $ 1,272 $ -  Foreign currency derivatives (2) 1,492 - 1,492 -  Total $ 7,574 $ 4,810 $ 2,764 $ -      Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  March 31, 2017 (Level 1) (Level 2) (Level 3)  Liabilities measured at fair value on a recurring basis:  Obligation related to assets held in the non-qualified deferred compensation program (1) $ 6,082 $ 4,810 $ 1,272 $ -  Foreign currency derivatives (2) 886 - 886 -  Total $ 6,968 $ 4,810 $ 2,158 $ -       Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  September 30, 2017 (Level 1) (Level 2) (Level 3)  Assets measured at fair value on a recurring basis:  Assets held in the non-qualified deferred compensation program (1) $ 6,702 $ 5,529 $ 1,173 $ -  Foreign currency derivatives (2) 852 - 852 -  Total $ 7,554 $ 5,529 $ 2,025 $ -       Based on  Quoted  prices Other  in active observable Unobservable  Fair Value at markets inputs inputs  September 30, 2017 (Level 1) (Level 2) (Level 3)  Liabilities measured at fair value on a recurring basis:  Obligation related to assets held in the non-qualified deferred compensation program (1) $ 6,702 $ 5,529 $ 1,173 $ -  Foreign currency derivatives (2) 1,344 - 1,344 -  Total $ 8,046 $ 5,529 $ 2,517 $ -   (1) The market value of the assets held in the trust for the non-qualified deferred compensation program is included as an asset and as a liability as the trust’s assets are both assets of the Company and also a liability as they are available to general creditors in certain circumstances.  (2) Foreign currency derivatives in the form of forward contracts are included in prepaid and other assets or accrued expenses in the consolidated balance sheets. Unrealized gains and losses on derivatives classified as cash flow hedges are recorded in other comprehensive income (loss). Realized gains and losses on derivatives classified as cash flow hedges and gains and losses on derivatives not designated as hedges are recorded in other income.

Financial Instruments and Inv23

Financial Instruments and Investments in Securities (Tables)	6 Months Ended
	Sep. 30, 2017
Financial Instruments and Investments in Securities [Abstract]
Investments in held-to-maturity securities, recorded at amortized cost	   March 31, 2017  Gross Gross  Unrealized Unrealized Estimated  Cost Gains Losses Fair Value  Short-term investments:  Corporate bonds $ 10,120 $ - $ (1) $ 10,119  Time deposits 518,628 148 - 518,776  $ 528,748 $ 148 $ (1) $ 528,895      September 30, 2017  Gross Gross  Unrealized Unrealized Estimated  Cost Gains Losses Fair Value  Short-term investments:  Commercial paper $ 74,912 $ 148 $ - $ 75,060  Time deposits 471,713 118 - 471,831  $ 546,625 $ 266 $ - $ 546,891 
Amortized cost and estimated fair value of held-to-maturity investments, by contractual maturity	   Held-to-Maturity  Amortized Estimated  Cost Fair Value  Due in one year or less $ 546,625 $ 546,891  Due after one year through five years - -  Total $ 546,625 $ 546,891 

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Sep. 30, 2017
Inventories [Abstract]
Inventories	  March 31, 2017 September 30, 2017  Finished goods $ 92,563 $ 91,373  Work in process 107,392 108,016  Raw materials and supplies 274,173 265,954  $ 474,128 $ 465,343 

Comprehensive Income (Loss) (Ta

Comprehensive Income (Loss) (Tables)	6 Months Ended
	Sep. 30, 2017
Comprehensive Income (Loss) [Abstract]
Comprehensive income (loss)	     Three Months Ended  September 30,  2016 2017  Pre-tax Net of Tax Pre-tax Net of Tax  Foreign currency translation adjustment $ 6,074 $ 6,074 $ 12,385 $ 12,385  Foreign currency cash flow hedges adjustment 20 (8) 195 267  Pension liability adjustment (1,259) (933) 91 68  Other comprehensive income (loss) $ 4,835 $ 5,133 $ 12,671 $ 12,720        Six Months Ended  September 30,  2016 2017  Pre-tax Net of Tax Pre-tax Net of Tax  Foreign currency translation adjustment $ 1,794 $ 1,794 $ 33,447 $ 33,447  Foreign currency cash flow hedges adjustment 621 527 (524) (421)  Pension liability adjustment (1,034) (780) (150) (113)  Other comprehensive income (loss) $ 1,381 $ 1,541 $ 32,773 $ 32,913  

Segment and Geographic Inform26

Segment and Geographic Information (Tables)	6 Months Ended
	Sep. 30, 2017
Segment and Geographic Information [Abstract]
Information about reported segments	     Three Months Ended Six Months Ended  September 30, September 30,  Sales Revenue: 2016 2017 2016 2017  Ceramic Components $ 46,432 $ 57,319 $ 96,555 $ 108,375  Tantalum Components 78,600 93,987 156,131 182,940  Advanced Components 89,112 83,601 172,407 168,530  Total Passive Components 214,144 234,907 425,093 459,845  AVX Interconnect 29,170 32,577 59,657 62,261  KCP Resale Connectors 7,755 9,439 14,582 18,143  KDP and KCD Resale 76,392 75,770 142,952 143,798  Total KED Resale 84,147 85,209 157,534 161,941  Total Revenue $ 327,461 $ 352,693 $ 642,284 $ 684,047      Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Operating profit:  Passive Components $ 41,428 $ 51,300 $ 87,060 $ 101,530  AVX Interconnect 4,525 3,366 9,743 6,644  KED Resale 5,115 4,776 9,599 9,265  Corporate activities (18,316) (14,656) (38,864) (30,222)  Total $ 32,752 $ 44,786 $ 67,538 $ 87,217     As of As of  March 31, 2017 September 30, 2017  Assets:  Passive Components $ 573,519 $ 612,479  AVX Interconnect 56,295 74,159  KED Resale 35,164 29,777  Cash, A/R, and investments in securities 1,294,129 1,361,958  Goodwill - Passive components 202,774 202,774  Goodwill - AVX Interconnect 10,277 10,277  Corporate activities 305,255 258,492  Total $ 2,477,413 $ 2,549,916 
Net sales generated by operations located within particular geographic areas	  Three Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Net sales:  Americas $ 92,946 $ 102,838 $ 185,802 $ 202,779  Europe 86,596 103,045 175,679 195,565  Asia 147,919 146,810 280,803 285,703  Total $ 327,461 $ 352,693 $ 642,284 $ 684,047  

Pension Plans (Tables)

Pension Plans (Tables)	6 Months Ended
	Sep. 30, 2017
Pension Plans [Abstract]
Net periodic cost for defined benefit plans	    U.S. Plans International Plans  Three Months Ended Three Months Ended  September 30, September 30,  2016 2017 2016 2017  Service cost $ 42 $ 33 $ 233 $ 231  Interest cost 364 352 1,152 1,136  Expected return on plan assets (445) (450) (1,458) (1,450)  Recognized actuarial loss 456 286 311 329  Net periodic pension cost $ 417 $ 221 $ 238 $ 246         U.S. Plans International Plans  Six Months Ended Six Months Ended  September 30, September 30,  2016 2017 2016 2017  Service cost $ 84 $ 66 $ 467 $ 459  Interest cost 728 704 2,405 2,244  Expected return on plan assets (890) (900) (3,045) (2,867)  Recognized actuarial loss 912 571 650 650  Net periodic pension cost $ 834 $ 441 $ 477 $ 486  

Derivative Financial Instrume28

Derivative Financial Instruments (Tables)	6 Months Ended
	Sep. 30, 2017
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments	  March 31, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 1,151 Accrued expenses $ 690      September 30, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 807 Accrued expenses $ 871 
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments	  March 31, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 341 Accrued expenses $ 196      September 30, 2017  Fair Value of Derivative Instruments  Asset Derivatives Liability Derivatives  Balance Balance  Sheet Fair Sheet Fair  Caption Value Caption Value   Foreign exchange contracts Prepaid and other $ 45 Accrued expenses $ 473 

Earnings Per Share (Basic and d

Earnings Per Share (Basic and diluted weighted average number of shares of common stock and potential common stock equivalents) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income	$ 34,818	$ 26,520	$ 66,302	$ 56,409
Weighted Average Shares Outstanding used in computing Basic EPS	168,262	167,324	168,167	167,389
Basic earnings per share	$ 0.21	$ 0.16	$ 0.39	$ 0.34
Effect of stock options	656	273	587	213
Weighted Average Shares used in computing Diluted EPS	168,918	167,597	168,754	167,602
Diluted income per share	$ 0.21	$ 0.16	$ 0.39	$ 0.34
Antidilutive Securities excluded from computation of diluted EPS		1,966	94	2,230

Trade Accounts Receivable (Trad

Trade Accounts Receivable (Trade Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Accounts Receivable - Trade	$ 210,666		$ 198,491
Allowances	20,796		21,761
Net Accounts Receivable - Trade	189,870		176,730
Allowances for Doubtful Accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	601	$ 1,447	1,285	$ 1,160	$ 449	$ 423
Stock Rotation And Ship From Stock And Debit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	15,119	14,893	14,853	18,803	17,048	14,314
Sales Returns And Discounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowances	$ 5,076	$ 5,163	$ 5,623	$ 6,138	$ 7,630	$ 6,681

Trade Accounts Receivable (Allo

Trade Accounts Receivable (Allowances) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance			$ 21,761
Ending Balance	$ 20,796		20,796
Allowances for Doubtful Accounts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,447	$ 449	1,285	$ 423
Charges		711	164	737
Applications	(846)		(848)
Ending Balance	601	1,160	601	1,160
Stock Rotation And Ship From Stock And Debit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	14,893	17,048	14,853	14,314
Charges	7,527	6,756	14,266	14,287
Applications	(7,301)	(5,001)	(14,000)	(9,798)
Ending Balance	15,119	18,803	15,119	18,803
Sales Returns And Discounts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5,163	7,630	5,623	6,681
Charges	2,715	3,575	6,780	7,381
Applications	(2,819)	(5,075)	(7,372)	(7,919)
Translation and other	17	8	45	(5)
Ending Balance	$ 5,076	$ 6,138	$ 5,076	$ 6,138

Fair Value (Measurement Inputs)

Fair Value (Measurement Inputs) (Details) - Recurring Basis [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held in the non-qualified deferred compensation program	$ 6,702	$ 6,082
Foreign currency derivatives	852	1,492
Assets measured at fair value, Total	7,554	7,574
Obligation related to assets held in the non-qualified deferred compensation program	6,702	6,082
Foreign currency derivatives	1,344	886
Liabilities measured at fair value, Total	8,046	6,968
Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held in the non-qualified deferred compensation program	5,529	4,810
Foreign currency derivatives
Assets measured at fair value, Total	5,529	4,810
Obligation related to assets held in the non-qualified deferred compensation program	5,529	4,810
Foreign currency derivatives
Liabilities measured at fair value, Total	5,529	4,810
Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held in the non-qualified deferred compensation program	1,173	1,272
Foreign currency derivatives	852	1,492
Assets measured at fair value, Total	2,025	2,764
Obligation related to assets held in the non-qualified deferred compensation program	1,173	1,272
Foreign currency derivatives	1,344	886
Liabilities measured at fair value, Total	2,517	2,158
Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets held in the non-qualified deferred compensation program
Foreign currency derivatives
Assets measured at fair value, Total
Obligation related to assets held in the non-qualified deferred compensation program
Foreign currency derivatives
Liabilities measured at fair value, Total

Financial Instruments and Inv33

Financial Instruments and Investments in Securities (Investments in held-to-maturity securities, recorded at amortized cost) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Cost	$ 546,625
Estimated Fair Value	546,891
Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Cost	546,625	$ 528,748
Gross Unrealized Gains	266	148
Gross Unrealized Losses		(1)
Estimated Fair Value	546,891	528,895
Short-Term Investments [Member] | Corporate Bonds [Member] | Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-term investments, Cost		10,120
Gross Unrealized Losses		(1)
Estimated Fair Value		10,119
Short-Term Investments [Member] | Commercial Paper [Member] | Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-term investments, Cost	74,912
Gross Unrealized Gains	148
Estimated Fair Value	75,060
Short-Term Investments [Member] | Time Deposits [Member] | Held-to-maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Short-term investments, Cost	471,713	518,628
Gross Unrealized Gains	118	148
Estimated Fair Value	$ 471,831	$ 518,776

Financial Instruments and Inv34

Financial Instruments and Investments in Securities (Amortized cost and estimated fair value of held-to-maturity investments by contractual maturity) (Details) $ in Thousands	Sep. 30, 2017USD ($)
Financial Instruments and Investments in Securities [Abstract]
Due in one year or less, Amortized Cost	$ 546,625
Due after one year through five years, Amortized Cost
Total, Amortized Cost	546,625
Due in one year or less, Estimated Fair Value	546,891
Due after one year through five years, Estimated Fair Value
Held-to-maturity Securities, Fair Value, Total	$ 546,891

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Inventories [Abstract]
Finished goods	$ 91,373	$ 92,563
Work in process	108,016	107,392
Raw materials and supplies	265,954	274,173
Total Inventory	$ 465,343	$ 474,128

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2017USD ($)claimitem	Mar. 31, 2017USD ($)
Loss Contingencies [Line Items]
Environmental reserves classified as other non-current liabilities	$ 15,289	$ 15,289
Accrual for Environmental Loss Contingencies	14,328
Greatbatch, Inc. v AVX Corporation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	37,500
Presidio Components, Inc. v. American Technical Ceramics Corp. [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value	$ 2,168
Greatbatch, Inc. v AVX Corporation And Presidio Components v. American Technical Ceramics Corp. [Member]
Loss Contingencies [Line Items]
Intellectual property cases | claim	2
Unfavorable Regulatory Action - Environmental Matters [Member]
Loss Contingencies [Line Items]
Environmental reserves classified as accrued expenses	$ 3,566	3,892
Loss Contingency Accrual, at Carrying Value	18,855	19,181
Unfavorable Regulatory Action - Patent Infringement Matters [Member] | Presidio Components, Inc. v. American Technical Ceramics Corp. [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	34,891
Unfavorable Regulatory Action - Patent Infringement Matters [Member] | Greatbatch, Inc. v AVX Corporation And Presidio Components v. American Technical Ceramics Corp. [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, at Carrying Value	$ 74,559	$ 74,559
Maximum [Member] | Unfavorable Regulatory Action - Patent Infringement Matters [Member] | Greatbatch, Inc. v AVX Corporation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | item	6
Minimum [Member] | Unfavorable Regulatory Action - Patent Infringement Matters [Member] | Greatbatch, Inc. v AVX Corporation [Member]
Loss Contingencies [Line Items]
Loss Contingency, Patents Allegedly Infringed, Number | item	1

Comprehensive Income (Loss) (De

Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustment, Pre-tax	$ 12,385	$ 6,074	$ 33,447	$ 1,794
Foreign currency cash flow hedges adjustment, Pre-tax	195	20	(524)	621
Pension liability adjustment, Pre-tax	91	(1,259)	(150)	(1,034)
Other comprehensive income (loss), Pre-tax	12,671	4,835	32,773	1,381
Foreign currency translation adjustment, Net of tax	12,385	6,074	33,447	1,794
Foreign currency cash flow hedges adjustment, Net of tax	267	(8)	(421)	527
Pension liability adjustment, Net of tax	68	(933)	(113)	(780)
Other comprehensive income (loss), net of income taxes	$ 12,720	$ 5,133	$ 32,913	$ 1,541

Segment and Geographic Inform38

Segment and Geographic Information (Information about reporting segments, net sales) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 352,693	$ 327,461	$ 684,047	$ 642,284
Passive Components [Member]
Segment Reporting Information [Line Items]
Net Sales	234,907	214,144	459,845	425,093
Ceramic Components [Member]
Segment Reporting Information [Line Items]
Net Sales	57,319	46,432	108,375	96,555
Tantalum Components [Member]
Segment Reporting Information [Line Items]
Net Sales	93,987	78,600	182,940	156,131
Advanced Components [Member]
Segment Reporting Information [Line Items]
Net Sales	83,601	89,112	168,530	172,407
KED Resale [Member]
Segment Reporting Information [Line Items]
Net Sales	85,209	84,147	161,941	157,534
KDP And KCD Resale [Member]
Segment Reporting Information [Line Items]
Net Sales	75,770	76,392	143,798	142,952
KCP Resale [Member]
Segment Reporting Information [Line Items]
Net Sales	9,439	7,755	18,143	14,582
Interconnect [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 32,577	$ 29,170	$ 62,261	$ 59,657

Segment and Geographic Inform39

Segment and Geographic Information (Information about reporting segments, operating profit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Operating profit (loss)	$ 44,786	$ 32,752	$ 87,217	$ 67,538
Passive Components [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	51,300	41,428	101,530	87,060
KED Resale [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	4,776	5,115	9,265	9,599
Interconnect [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	3,366	4,525	6,644	9,743
Corporate Administration [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (14,656)	$ (18,316)	$ (30,222)	$ (38,864)

Segment and Geographic Inform40

Segment and Geographic Information (Information about reporting segments, assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Segment Reporting Information [Line Items]
Assets	$ 2,549,916	$ 2,477,413
Passive Components [Member]
Segment Reporting Information [Line Items]
Assets	612,479	573,519
Cash A/R And Investments In Securities [Member]
Segment Reporting Information [Line Items]
Assets	1,361,958	1,294,129
KED Resale [Member]
Segment Reporting Information [Line Items]
Assets	29,777	35,164
Goodwill - Passive Components [Member]
Segment Reporting Information [Line Items]
Assets	202,774	202,774
Interconnect [Member]
Segment Reporting Information [Line Items]
Assets	74,159	56,295
Goodwill - Interconnect [Member]
Segment Reporting Information [Line Items]
Assets	10,277	10,277
Corporate Administration [Member]
Segment Reporting Information [Line Items]
Assets	$ 258,492	$ 305,255

Segment and Geographic Inform41

Segment and Geographic Information (Net sales generated by operations located within particular geographic areas) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 352,693	$ 327,461	$ 684,047	$ 642,284
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	102,838	92,946	202,779	185,802
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	103,045	86,596	195,565	175,679
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 146,810	$ 147,919	$ 285,703	$ 280,803

Pension Plans (Narrative) (Deta

Pension Plans (Narrative) (Details)	6 Months Ended
	Sep. 30, 2017USD ($)
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions made	$ 261,000
Expected additional contributions	0
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions made	3,095,000
Expected additional contributions	$ 3,073,000

Pension Plans (Net periodic pen

Pension Plans (Net periodic pension cost for defined benefit plans) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
U.S. Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 33	$ 42	$ 66	$ 84
Interest cost	352	364	704	728
Expected return on plan assets	(450)	(445)	(900)	(890)
Recognized actuarial loss	286	456	571	912
Net periodic pension cost	221	417	441	834
International Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	231	233	459	467
Interest cost	1,136	1,152	2,244	2,405
Expected return on plan assets	(1,450)	(1,458)	(2,867)	(3,045)
Recognized actuarial loss	329	311	650	650
Net periodic pension cost	$ 246	$ 238	$ 486	$ 477

Derivative Financial Instrume44

Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Mar. 31, 2017
Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net pre-tax gains (losses) recognized in OCI	$ (1,565)	$ (813)
Hedging contract gains (losses) recognized in other income (expense)	(395)	(877)
Exchange gains (losses) recognized in other income (expense)	(762)	(1,324)
Outstanding foreign exchange contracts	247,513	247,513	$ 193,156
Foreign Exchange Contract [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain on Derivative Instruments, Pretax	1,368	2,413
Foreign Exchange Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Loss On Derivative Instruments Pretax	$ (1,596)	$ (2,017)
Foreign Exchange Forward [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract maximum maturity term	4 months

Derivative Financial Instrume45

Derivative Financial Instruments (Fair value of Derivative Instruments) (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Mar. 31, 2017
Designated as Hedging Instrument [Member] | Prepaid And Other [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 807	$ 1,151
Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	871	690
Not Designated as Hedging Instrument [Member] | Prepaid And Other [Member]
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	45	341
Not Designated as Hedging Instrument [Member] | Accrued Expenses [Member]
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 473	$ 196

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 19, 2017	Oct. 02, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Dividends declared, dividend per share			$ 0.115	$ 0.110	$ 0.225	$ 0.215
Dividends payable, date declared			Oct. 19, 2017
Dividends payable, date of record			Nov. 2, 2017
Dividends payable, date to be paid			Nov. 16, 2017
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared, dividend per share	$ 0.115
Subsequent Event [Member] | Transportation, Sensing and Control (“TS&C”) [Member]
Subsequent Event [Line Items]
Business Acquisition, Effective Date of Acquisition		Oct. 2, 2017
Payments to Acquire Businesses, Gross		$ 156