Nidec (NJDCY) 20-F 21 Jun 16 2016 FY Annual report (foreign) Financial data

Document and Entity Information

Document and Entity Information	12 Months Ended
	Mar. 31, 2016shares
Document And Entity Information
Document Type	20-F
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Entity Registrant Name	NIDEC CORP
Entity Central Index Key	1,158,967
Current Fiscal Year End Date	--03-31
Entity Voluntary Filers	Yes
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	298,142,234

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Current assets:
Cash and cash equivalents	¥ 305,942	¥ 269,902
Trade notes and accounts receivable, net of allowance for doubtful accounts of 830 million on March 31, 2015 and 809 million on March 31, 2016:
Notes	16,589	15,221
Accounts	218,680	222,396
Inventories	170,951	170,874
Other current assets	53,150	50,622
Total current assets	765,312	729,015
Marketable securities and other securities investments	16,004	21,516
Investments in and advances to affiliated companies	1,896	2,167
Long-term Investments, Total	17,900	23,683
Property, plant and equipment:
Land	47,477	47,427
Buildings	190,362	189,742
Machinery and equipment	450,860	430,019
Construction in progress	33,340	33,831
Property, Plant and Equipment, Gross, Total	722,039	701,019
Less-Accumulated depreciation	(374,310)	(358,897)
Property, Plant and Equipment, net	347,729	342,122
Goodwill	162,963	162,959
Other non-current assets, net of allowance for doubtful accounts of 465 million on March 31, 2015 and 461 million on March 31, 2016	90,568	99,561
Total assets	1,384,472	1,357,340
Current liabilities:
Short-term borrowings	81,092	52,401
Current portion of long-term debt	82,796	45,485
Trade notes and accounts payable	177,254	194,998
Accrued expenses	34,948	33,375
Other current liabilities	44,388	36,689
Total current liabilities	420,478	362,948
Long-term liabilities:
Long-term debt	136,894	184,612
Accrued pension and severance costs	19,169	19,576
Other long-term liabilities	35,426	37,105
Total long-term liabilities	¥ 191,489	¥ 241,293
Commitments and contingencies (Notes 21 and 22)
Equity:
Common stock authorized 2015 and 2016: 960,000,000 shares; issued: 2015 294,108,416 shares / 2016- 298,142,234 shares	¥ 87,784	¥ 77,071
Additional paid-in capital	116,058	105,459
Retained earnings	495,761	427,641
Accumulated other comprehensive income (loss):
Foreign currency translation adjustments	77,624	131,332
Net unrealized gains and losses on securities	3,698	7,412
Net gains and losses on derivative instruments	(746)	(1,072)
Pension liability adjustments	(3,847)	(2,844)
Treasury stock, at cost: 2015- 9,636 shares / 2016 1,541,210 shares	(12,111)	(27)
Total Nidec Corporation shareholders' equity	764,221	744,972
Noncontrolling interests	8,284	8,127
Total equity	772,505	753,099
Total liabilities and equity	¥ 1,384,472	¥ 1,357,340

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
CONSOLIDATED BALANCE SHEETS
Trade notes and accounts receivable, allowance for doubtful accounts	¥ 809	¥ 830
Other non-current assets, allowance for doubtful accounts	¥ 461	¥ 465
Common stock, authorized	960,000,000	960,000,000
Common stock, issued	298,142,234	294,108,416
Treasury stock, shares	1,541,210	9,636

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
CONSOLIDATED STATEMENTS OF INCOME
Net sales	¥ 1,178,290	¥ 1,028,385	¥ 875,109
Operating expenses:
Cost of products sold	908,311	786,486	674,903
Selling, general and administrative expenses	93,463	85,781	77,534
Research and development expenses	51,978	45,179	37,808
Total operating expenses	1,053,752	917,446	790,245
Operating income	124,538	110,939	84,864
Other income (expense):
Interest and dividend income	1,913	2,359	2,376
Interest expense	(2,228)	(1,487)	(1,526)
Foreign exchange (loss) gain, net	(153)	804	(56)
Gain on marketable securities, net	946	70	245
Other, net	(5,688)	(5,593)	(1,443)
Total other income (expense)	(5,210)	(3,847)	(404)
Income before income taxes	119,328	107,092	84,460
Income taxes	(26,466)	(29,033)	(25,658)
Equity in net (loss) income of affiliated companies	1	29	(25)
Consolidated net income	92,863	78,088	58,777
Less: Net income attributable to noncontrolling interests	(1,053)	(2,073)	(2,505)
Net income attributable to Nidec Corporation	¥ 91,810	¥ 76,015	¥ 56,272
Earning per share-basic
Net income attributable to Nidec Corporation, Basic	¥ 309.32	¥ 271.61	¥ 206.82
Earning per share-diluted
Net income attributable to Nidec Corporation, Diluted	308.19	256.05	193.50
Cash dividends paid	¥ 80	¥ 57.50	¥ 42.50

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Consolidated net income	¥ 92,863	¥ 78,088	¥ 58,777
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(54,491)	77,753	43,429
Net unrealized gains and losses on securities	(3,714)	3,243	2,980
Net gains and losses on derivative instruments	326	(1,048)	(266)
Pension liability adjustments	(981)	(2,534)	738
Total other comprehensive income (loss)	(58,860)	77,414	46,881
Total comprehensive income (loss)	34,003	155,502	105,658
Less: Comprehensive (income) loss attributable to noncontrolling interests	(292)	(3,037)	(3,961)
Comprehensive income (loss) attributable to Nidec Corporation	¥ 33,711	¥ 152,465	¥ 101,697

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - JPY (¥) ¥ in Millions	Common stock	Additional Paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock, at cost	Nidec Corporation total shareholders' equity	Non- controlling interests	Total
Beginning Balance (in shares) at Mar. 31, 2013	290,150,160
Beginning Balance at Mar. 31, 2013	¥ 66,551	¥ 70,518	¥ 322,638	¥ 12,953	¥ (57,007)	¥ 415,653	¥ 38,164	¥ 453,817
Comprehensive income (loss):
Net income			56,272			56,272	2,505	58,777
Other comprehensive income (loss)
Foreign currency translation adjustments				41,904		41,904	1,525	43,429
Net unrealized gains and losses on securities				2,998		2,998	(18)	2,980
Net gains and losses on derivative instruments				(266)		(266)		(266)
Pension liability adjustments				789		789	(51)	738
Total other comprehensive income (loss)						45,425	1,456	46,881
Total comprehensive income (loss)						101,697	3,961	105,658
Purchase of treasury stock					(2,838)	(2,838)		(2,838)
Change in ownership of subsidiaries in connection with share exchange transaction		(4,279)			20,655	16,376	(16,376)
Dividends paid to shareholders of Nidec Corporation			(11,425)			(11,425)		(11,425)
Dividends paid to noncontrolling interests							(894)	(894)
Capital transaction with consolidated subsidiaries and other		(1,042)			(450)	(1,492)	(2,033)	(3,525)
Ending Balance (in shares) at Mar. 31, 2014	290,150,160
Ending Balance at Mar. 31, 2014	¥ 66,551	65,197	367,485	58,378	(39,640)	517,971	22,822	540,793
Comprehensive income (loss):
Net income			76,015			76,015	2,073	78,088
Other comprehensive income (loss)
Foreign currency translation adjustments				76,792		76,792	961	77,753
Net unrealized gains and losses on securities				3,227		3,227	16	3,243
Net gains and losses on derivative instruments				(1,048)		(1,048)		(1,048)
Pension liability adjustments				(2,521)		(2,521)	(13)	(2,534)
Total other comprehensive income (loss)						76,450	964	77,414
Total comprehensive income (loss)						152,465	3,037	155,502
Conversion of convertible bond	¥ 10,520	34,582			29,130	74,232		74,232
Conversion of convertible bond (in shares)	3,958,256
Purchase of treasury stock					(2,159)	(2,159)		(2,159)
Change in ownership of subsidiaries in connection with share exchange transaction		5,175			11,960	17,135	(17,135)
Dividends paid to shareholders of Nidec Corporation			(15,859)			(15,859)		(15,859)
Dividends paid to noncontrolling interests							(611)	(611)
Capital transaction with consolidated subsidiaries and other		505			682	1,187	14	¥ 1,201
Ending Balance (in shares) at Mar. 31, 2015	294,108,416							294,108,416
Ending Balance at Mar. 31, 2015	¥ 77,071	105,459	427,641	134,828	(27)	744,972	8,127	¥ 753,099
Comprehensive income (loss):
Net income			91,810			91,810	1,053	92,863
Other comprehensive income (loss)
Foreign currency translation adjustments				(53,708)		(53,708)	(783)	(54,491)
Net unrealized gains and losses on securities				(3,714)		(3,714)		(3,714)
Net gains and losses on derivative instruments				326		326		326
Pension liability adjustments				(1,003)		(1,003)	22	(981)
Total other comprehensive income (loss)						(58,099)	(761)	(58,860)
Total comprehensive income (loss)						33,711	292	34,003
Conversion of convertible bond	¥ 10,713	10,628			22	21,363		21,363
Conversion of convertible bond (in shares)	4,033,818
Purchase of treasury stock					(12,133)	(12,133)		(12,133)
Dividends paid to shareholders of Nidec Corporation			(23,690)			(23,690)		(23,690)
Dividends paid to noncontrolling interests							(54)	(54)
Capital transaction with consolidated subsidiaries and other		(29)			27	(2)	(81)	¥ (83)
Ending Balance (in shares) at Mar. 31, 2016	298,142,234							298,142,234
Ending Balance at Mar. 31, 2016	¥ 87,784	¥ 116,058	¥ 495,761	¥ 76,729	¥ (12,111)	¥ 764,221	¥ 8,284	¥ 772,505

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Consolidated net income	¥ 92,863	¥ 78,088	¥ 58,777
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	55,298	45,087	39,497
Amortization	9,438	8,317	6,814
Gain from marketable securities, net	(946)	(70)	(245)
Loss (gain) on sales, disposal or impairment of property, plant and equipment	23	(275)	534
Deferred income taxes	2,036	6,523	9,146
Equity in net loss (income) of affiliated companies	(1)	(29)	25
Foreign currency adjustments	(14)	1,634	(3,498)
Accrual for pension and severance costs, net payments	151	1,583	(4,240)
Changes in operating assets and liabilities:
Increase in notes and accounts receivable	(5,163)	(20,109)	(19,957)
Increase in inventories	(6,722)	(29,565)	(10,070)
Increase (decrease) in notes and accounts payable	(6,897)	10,054	14,299
Increase (decrease) in accrued income taxes	(391)	220	3,899
Other	7,935	(9,583)	(7,762)
Net cash provided by operating activities	147,610	91,875	87,219
Cash flows from investing activities:
Additions to property, plant and equipment	(81,918)	(58,042)	(40,297)
Proceeds from sales of property, plant and equipment	1,437	3,110	2,601
Purchases of marketable securities	(507)	(6)	(309)
Proceeds from sales or redemption of marketable securities	1,319	68	1,059
Acquisitions of business, net of cash acquired	(9,665)	(27,343)	(23,350)
Proceeds from sales of business, net of cash divested		3,381	210
Other	(5,981)	(2,398)	(3,092)
Net cash used in investing activities	(95,315)	(81,230)	(63,178)
Cash flows from financing activities:
(Decrease) increase in short-term borrowings	32,412	29,592	(11,821)
Proceeds from issuance of long-term debt	37,903	78	30,000
Repayments of long-term debt	(26,210)	(30,104)	(34,323)
Proceeds from issuance of corporate bonds			50,000
Redemption of corporate bonds			(4,250)
Purchases of treasury stock	(12,133)	(2,159)	(2,838)
Payments for additional investments in subsidiaries	(191)	(292)	(217)
Dividends paid to shareholders of Nidec Corporation	(23,690)	(15,859)	(11,425)
Other	(316)	(764)	(1,655)
Net cash provided by (used in) financing activities	7,775	(19,508)	13,471
Effect of exchange rate changes on cash and cash equivalents	(24,030)	31,025	16,808
Net increase in cash and cash equivalents	36,040	22,162	54,320
Cash and cash equivalents at beginning of year	269,902	247,740	193,420
Cash and cash equivalents at end of year	¥ 305,942	¥ 269,902	¥ 247,740

Nature of operations

Nature of operations	12 Months Ended
	Mar. 31, 2016
Nature of operations
Nature of operations	1. Nature of operations: NIDEC Corporation (the “Company”) and its subsidiaries (collectively “NIDEC”) are primarily engaged in the design, development, manufacture and marketing of i) small precision motors, which include spindle motors for hard disk drives, brushless motors, fan motors, vibration motors, brush motors and motor applications; ii) automotive, appliance, commercial and industrial products, which includes automotive motors and components, home appliance, commercial and industrial motors and related products; iii) machinery, which includes industrial robots, card readers, test systems, pressing machines and power transmission drives; iv) electronic and optical components, which include switches, trimmer potentiometers, lens units and camera shutters; and v) others, which include services. Manufacturing operations are located primarily in Asia (China, Thailand, Vietnam and the Philippines), North America, Japan and Europe, and sales subsidiaries are primarily located in Asia, Japan, North America and Europe. NIDEC sells its products to the manufacturers of hard disk drives, various electric household appliances, automation equipment, automotive components, home video game consoles, telecommunication equipment and audio-visual equipment.

Summary of significant accounti

Summary of significant accounting policies	12 Months Ended
	Mar. 31, 2016
Summary of significant accounting policies
Summary of significant accounting policies	2. Summary of significant accounting policies: The Company and its subsidiaries in Japan maintain their records and prepare their financial statements in accordance with accounting principles generally accepted in Japan, and its foreign subsidiaries in conformity with those of their countries of domicile. Certain adjustments and reclassifications have been incorporated in the accompanying consolidated financial statements to conform with accounting principles generally accepted in the United States of America. Significant accounting policies after reflecting adjustments for the above are as follows: Estimates - The preparation of NIDEC’s consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Some of the more significant estimates include the valuation of inventories, allowance for doubtful accounts, depreciation and amortization of long-lived assets, valuation allowance for deferred tax assets, valuation of investment securities, fair value of financial instruments, uncertain tax positions, pension liabilities, the recoverability of long-lived assets and goodwill, and fair value of assets acquired and liabilities assumed. Actual results could differ from those estimates. Basis of consolidation and accounting for investments in affiliated companies - The consolidated financial statements include the accounts of the Company and those of its majority-owned subsidiary companies. All significant intercompany transactions and accounts have been eliminated. Companies over which NIDEC exercises significant influence, but which it does not control, are classified as affiliated companies and accounted for using the equity method. Consolidated net income includes NIDEC’s equity in current earnings (losses) of such companies, after elimination of unrealized intercompany profits. On occasion, NIDEC may acquire additional shares of the voting rights of a consolidated subsidiary or dispose of a part of those shares or a Nidec consolidated subsidiary may issue its shares to third parties. With respect to such transactions, all transactions for changes in a parent’s ownership interest in a subsidiary that do not result in the subsidiary ceasing to be a subsidiary are recognized as equity transactions. Translation of foreign currencies - Non monetary asset and liability accounts of foreign subsidiaries and affiliates are translated into Japanese yen at the year-end exchange rates and all income and expense accounts are translated at exchange rates that approximate those prevailing at the time of the transactions. The resulting translation adjustments are included as a component of accumulated other comprehensive income in shareholders’ equity. Monetary assets and liabilities denominated in foreign currencies are translated at the year-end exchange rates and the resulting transaction gains or losses are taken into income. Cash and cash equivalents - Cash and cash equivalents include all highly liquid investments, with original maturities of three months or less that are readily convertible to known amounts of cash and are so near maturity that they present insignificant risk of changes in value because of changes in interest rates. NIDEC participate in a notional pooling arrangement with a single financial institution, which is used to fund short-term liquidity needs. This arrangement contains specific provisions for the right to offset positive and negative cash balances. The facility allows for cash withdrawals from this financial institution based upon our aggregate cash deposits within the same financial institution. Our audited consolidated financial statements reflect cash net of withdrawals of ¥3,831 million as of March 31, 2016. Inventories - Inventories are stated at the lower of cost or market. Cost is determined principally on the weighted average cost basis. Cost includes the cost of materials, labor and applied factory overhead. Projects in progress, which mainly relate to production of factory automation equipment based on contracts with customers, are stated at the lower of cost or market, cost being determined as the accumulated production cost. Marketable securities - Marketable securities consist of equity securities that are listed on recognized stock exchanges and debt securities. Equity securities designated as available-for-sale are carried at fair value with changes in unrealized gains or losses included as a component of accumulated other comprehensive income in shareholders’ equity, net of applicable taxes. Realized gains and losses are determined on the average cost method and are reflected in the statement of income. Other than temporary declines in market value of individual securities classified as available-for-sale are charged to income in the period the loss occurs. Debt securities designated as held-to-maturity securities are recorded at amortized cost, adjusted for the amortization or accretion of premiums or discounts. Derivative financial instruments - NIDEC manages the exposures of fluctuations in foreign exchange rate, interest rate and commodity prices through the use of derivative financial instruments which include foreign exchange forward contracts, interest rate swap agreements, currency swap agreements and commodity future contracts. NIDEC does not hold derivative financial instruments for trading purposes. Derivatives are accounted for under ASC 815, “Derivatives and Hedging.” All derivatives are recorded as either assets or liabilities on the balance sheet and measured at fair value. Changes in the fair value of derivatives are charged in current earnings. However certain derivatives may qualify for hedge accounting as a cash flow hedge, if the hedging relationship is expected to be highly effective in achieving offsetting of cash flows of the hedging instruments and hedged items. Under hedge accounting, changes in the fair value of the effective portion of these derivatives designated as cash flow hedge derivatives are deferred in accumulated other comprehensive income and charged to earnings when the underlying transaction being hedged occurs. NIDEC designates certain foreign exchange forward contracts, interest rate swap agreements and commodity future contracts as cash flow hedges. NIDEC formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives designated as cash flow hedges to specific assets and liabilities on the balance sheet or forecasted transactions. NIDEC also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting cash flows of hedged items. When it is determined that a derivative is not a highly effective hedge or that it has ceased to be a highly effective hedge, NIDEC discontinues hedge accounting prospectively. When a cash flow hedge is discontinued, the previously recognized net derivative gains or losses remain in accumulated other comprehensive income until the hedged transaction occurs, unless it is probable that the forecasted transaction will not occur at which point the derivative gains or losses are reclassified into earnings immediately. Property, plant and equipment - Property, plant and equipment are stated at cost. Major renewals and improvements are capitalized; minor replacements, maintenance and repairs are charged to expense in the year incurred. Depreciation of property, plant and equipment is computed on the straight-line method at rates based on the estimated useful lives of the assets. Estimated useful lives range from 7 to 47 years for factories to produce NIDEC’s products, 50 years for the head office and sales offices, from 3 to 18 years for leasehold improvements, and from 2 to 15 years for machinery and equipment. Depreciation expense amounted to ¥39,497 million, ¥45,087 million, and ¥ 55,298 million for the years ended March 31, 2014, 2015 and 2016, respectively. Lease- NIDEC capitalizes leases and related obligations when any of the four criteria are met within the guidance of ASC 840 “Leases”. Under ASC840, these leases and related obligations are capitalized at the commencement of the lease at the lower of the fair value of the leased property and the present value of the minimum lease payments. Goodwill and other intangible assets - Goodwill and other intangible assets are accounted for under ASC350, “Intangibles - Goodwill and Other”. Goodwill acquired in business combinations is not amortized but tested annually for impairment. NIDEC tests for impairment at the reporting unit level on January 1st of each year. In addition, NIDEC tests for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. This test is a two-step process. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of the reporting unit with its carrying amount, including goodwill. If the fair value, which is based on discounted future cash flows, exceeds the carrying amount, goodwill is not considered impaired. If the carrying amount exceeds the fair value, the second step must be performed to measure the amount of the impairment loss, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. Other intangible assets include proprietary technology and customer relationships, as well as software and other intangible assets acquired in business combinations. Intangible assets with an indefinite life are not subject to amortization and are tested for impairment once on January 1st of each year or more frequently if an event occurs or circumstances change. Intangible assets with a definite life are amortized on a straight-line basis over their estimated useful lives. The weighted average amortization period for proprietary technology, customer relationships and software are 12 years, 18 years and 6 years, respectively. Long-lived assets - NIDEC reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. An impairment loss would be recognized when the carrying amount of an asset group exceeds the estimated undiscounted future cash flows expected to result from the use of the asset group and its eventual disposition. The amount of the impairment loss to be recorded is calculated as the excess of the assets group’s carrying value over its fair value. Long-lived assets that are to be disposed of other than by sale are considered to be held and used until the disposal. Long-lived assets that are to be disposed of by sale are reported at the lower of their carrying value or fair value less costs to sell. Reductions in carrying value are recognized in the period in which long-lived assets are classified as held for sale. Revenue recognition - NIDEC recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable and collectibility is reasonably assured. For small precision motors, automotive, appliance, commercial and industrial products and electronic and optical components, these criteria are generally met at the time a product is delivered to the customers’ site which is the time the customer has taken title to the product and the risk and rewards of ownership have been substantively transferred. These conditions are met at the time of delivery to customers in domestic sales (FOB destination) and at the time of shipment for export sales (FOB shipping point). Revenue for machinery sales is recognized upon receipt of final customer acceptance. At the time the related revenue is recognized, NIDEC makes provisions for estimated product returns. Revenue from a part of sales of automotive, appliance, commercial and industrial products under long-term construction type arrangements are recognized under the percentage-of-completion method. Under the percentage-of-completion method, revenue is recognized as a percentage of estimated total revenue that incurred costs to date bear to estimated total costs after giving effect to estimates of costs to complete based upon the most recent information. Research and development expenses- Research and development expenses, mainly consisting of personnel and depreciation expenses at research and development branches, are charged to operations as incurred. Advertising costs - Advertising and sales promotion costs are expensed as incurred. Advertising costs were ¥477 million, ¥525 million, and ¥ 684 million for the years ended March 31, 2014, 2015 and 2016, respectively. Income taxes - The provision for income taxes is computed based on the pretax income included in the consolidated statement of income. The asset and liability approach is used to recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. NIDEC recognizes the financial statement effects of tax positions when it is more likely than not, based on the technical merits, that the tax positions will be sustained upon examination by the tax authorities. Benefits from tax positions that meet the more-likely-than-not recognition threshold are measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement. Interest and penalties accrued related to unrecognized tax benefits are included in other, net in the consolidated statements of income. Earnings per share - Basic net income per common share is calculated by dividing net income by the weighted-average number of shares outstanding during the reported period. The calculation of diluted net income per common share is similar to the calculation of basic net income per share, except that the weighted-average number of shares outstanding includes the additional dilution from potential common stock equivalents such as convertible bonds and options. Reclassification Certain reclassifications of previously reported amounts have been made to the consolidated financial statements and footnotes for the years ended March 31, 2014 and 2015 to conform to the current year presentation. Accounting Changes As of April 1, 2015, NIDEC adopted FASB Accounting Standards Codification™ (ASC) 205 “Presentation of Financial Statements” and ASC 360 “Property, Plant, and Equipment” updated by Accounting Standards Update (ASU) No. 2014-08 “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”. ASU 2014-08 requires that a disposal of a component or a group of components of an entity should be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results when the component meets the criteria to be classified as held for sale or is disposed. ASU 2014-08 also requires additional disclosures about discontinued operations and disposal of an individually significant component of an entity that does not qualify for discontinued operations. The adoption of this standard did not have any impact on NIDEC’s consolidated financial position, results of operations or liquidity. Recent Accounting Pronouncements Nidec decided to voluntarily adopt International Financial Reporting Standards (“IFRS”) to its consolidated financial statements in lieu of the current US-GAAP to strengthen and improve the efficiency of financial reporting. Nidec is due to disclose its consolidated financial statements according to IFRS from the first quarter of the fiscal year ending March 2017.Therefore, Nidec will not present the recent U.S. GAAP accounting pronouncements that have not been effective yet as Nidec will not apply them. Nidec is currently evaluating the potential impact from adopting IFRS on its consolidated financial position, results of operations and liquidity.

Acquisitions and dispositions

Acquisitions and dispositions	12 Months Ended
	Mar. 31, 2016
Acquisitions and dispositions
Acquisitions and dispositions	3. Acquisitions and dispositions On January 1, 2014, NIDEC acquired all of the voting rights in Mitsubishi Materials C.M.I. Corporation (currently Nidec Sankyo CMI Corporation), a Japanese company, which consists of development, manufacturing and sale of small motors, electric contact products and other products for cash of ¥5,228 million, in order to strengthen our automotive product business and enhance our product portfolio. On March 31, 2014, NIDEC acquired all of the voting rights in Honda Elesys Co., Ltd. (currently Nidec Elesys Corporation), a Japanese company, which consists of development, manufacturing and sale of automobile electronic control units for car bodies for cash of ¥24,320 million, mainly in order to combine our EPS motors with Elesys’ electronic control units (ECU) to be transformed into a module business, and create sales synergies by utilizing Nidec Group’s sales network for automotive motors. On February 2, 2015, NIDEC acquired all of the voting rights in Geräte- und Pumpenbau GmbH Dr. Eugen Schmidt (currently NIDEC GPM GmbH) (“GPM”), a German company, which consists of development, manufacturing and sale of automotive oil pumps and modules for passenger cars and commercial vehicles for cash of ¥30,024 million, in order to further transform its business model from one based solely on motors to one based on modularization / systematization and to accelerate its shift to high value-added businesses. On February 2, 2015, NIDEC disposed of all of the voting rights in Nidec Logistics Corporation to Maruzen Showa Unyu Co., Ltd. for cash of ¥5,000 million. Gain on sales of the subsidiary’s stocks of ¥1,182 million arising from the disposition was included in selling, general and administrative expenses in the consolidated statement of income for the year ended March 31, 2015. On May 15, 2015, NIDEC acquired all of the voting rights in Motortecnica s.r.l., an Italian company, which consists of design, manufacturing, repair, maintenance and servicing of electrical rotating machinery for cash of ¥1,897 million from its founding family, in order to strengthen its service business and expand in the generators market. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On June 2, 2015, NIDEC additionally acquired a certain amount of the voting rights in Sejin Electron (Hong Kong) Co., Limited (currently SCD (Hong Kong) Co., LTD.), a Chinese company, which consists of manufacture and marketing of automotive parts and appliance motors for cash of ¥424 million from Sejin Electron Inc., in order to strengthen its manufacturing capacity and expand in the automotive and appliance market. As a result of the acquisition, its voting rights in Sejin Electron (HK) increased from 50.0% to 100.0%. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On July 31, 2015, NIDEC acquired the switched reluctance (SR) motor and drive business of China Tex Mechanical & Electrical Engineering Ltd (currently Nidec (Beijing) Drive Technologies Co., Ltd.), a Chinese company, which consists of design, development, manufacture and marketing of SR motors and drives for cash of ¥407 million, in order to start manufacturing and developing SR motors and drives in China, which is a significant step forward in enhancing its presence in the industrial solution products market. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On August 24, 2015, NIDEC acquired all of the voting rights in Arisa, S.A. (currently Nidec Arisa S.L.U.), a Spanish company, which consists of development, manufacturing, sales and aftermarket services of large-sized servo press machines for cash of ¥3,878 million from its founding family, in order to effectively supplement the Company’s overall press machine business and enhance the Company’s brand exposure to the European automotive industry. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On August 31, 2015, NIDEC acquired all of the voting rights in KB Electronics, Inc. (taken over by Nidec Motor Corporation in March 2016), a US company, which consists of design, manufacture and sales of AC and DC electric motor drives and controls for cash of ¥3,672 million from its founding family, in order to add KB drives and controls into our product portfolio and expand our ability to provide packaged solutions to customers who want to pair a simple AC input variable speed control with a motor. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On September 1, 2015, NIDEC acquired the business of E.M.G. Elettromeccanica S.r.l., an Italian company, which consists of development, production and sales of motors for commercial facilities such as swimming pool and spa, air and smoke ventilation as well as household appliances and industrial equipment (brake motors, etc.) for cash of ¥931 million, in order to draw on its core strengths and gain a strong foothold in the world market for commercial and residential solutions, including motors for pumps used in swimming pools and spas and enrich our product lines and improving our production efficiency as well as further enhance its inter-group procurement synergies necessary to bring NIDEC to the leadership position in the European commercial equipment market. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. On September 8, 2015, NIDEC acquired all of the voting rights in PT. NAGATA OPTO INDONESIA, an Indonesian company, which consists of processing of glass lenses for cash of ¥212 million from its founding family, in order to grow its automotive lens unit business further by strengthening production capacity through active capital investment to meet growing market demand and improve profitability by gaining in-house production capabilities of glass lenses. This acquisition did not have a material impact on NIDEC’s consolidated financial position, results of operations or liquidity. Pursuant to ASC 805 “Business Combinations,” previous year’s consolidated financial statements have been retrospectively adjusted to reflect NIDEC’s valuation of the fair values of the assets acquired and the liabilities assumed upon the acquisition of GPM in the fiscal year ended March 31, 2015. During the three months ended September 30, 2015, NIDEC completed its valuation of such assets and liabilities of GPM. The effects of the adjustments for each consolidated financial statement were as follows: Consolidated balance sheet as of March 31, 2015 Current assets ¥(1,499) million, property, plant and equipment ¥3,144 million, goodwill ¥(9,471) million, intangible assets ¥9,972 million, other noncurrent assets ¥55 million, liability ¥2,400 million and equity ¥(199) million. Of intangible assets, Trademark of ¥3,156 million is not subject to amortization. The remaining intangible assets are subject to amortization and consist of customer relationships of ¥3,647 million, developed technologies of ¥3,169 million. NIDEC has estimated the weighted average amortization period for the customer relationships and developed technologies to be 20 years and 15 years, respectively. Consolidated statement of income for the year ended March 31, 2015 Operating income ¥(279) million, income before income taxes ¥(279) million and net income attributable to Nidec Corporation ¥(201) million. In addition, NIDEC is currently evaluating the fair values of the assets acquired and the liabilities assumed upon the acquisitions of companies executed in the fiscal year ending March 31, 2016. Assets and liabilities which are currently under evaluaton have been recorded on NIDEC’s consolidated balance sheet based on preliminary management estimation as of March 31, 2016. With regard to assets and liabilities of which fair value evaluation is completed, consolidated financial statements for the six months ended September 30, 2015 have been retrospectively adjusted to reflect NIDEC’s valuation of fair value. These evaluations do not have material impacts on NIDEC’s consolidated financial position, results of operations or liquidity. The following represent the unaudited pro forma results of operations of NIDEC for the years ended March 31, 2014 and 2015, as if the acquisitions of GPM had occurred on April 1, 2013. The unaudited pro forma results of operations are presented for comparative purposes only and are not necessarily indicative of the results of operations that may occur in the future or that would have occurred had the acquisitions been in effect on the dates indicated. Pro forma results of operations on the acquisitions during the years ended March 31, 2016 are omitted because of their immaterialities. The unaudited pro forma results of operations of NIDEC for the years ended March 31, 2014 and 2015, as if the acquisition of GPM had occurred on April 1, 2013. Yen in millions For the year ended March 31 (Unaudited) 2014 2015 Pro forma net sales ¥ ¥ Pro forma net income Yen Pro forma n et income a ttributable to Nidec Corporation per share — Basic ¥ ¥ — Diluted Note: NIDEC implemented a two-for-one stock split on its common stock as of April 1, 2014. Each p ro forma n et income a ttributable to Nidec Corporation per share has been adjusted to reflect the effect of the stock split.

Goodwill and other intangible a

Goodwill and other intangible assets	12 Months Ended
	Mar. 31, 2016
Goodwill and other intangible assets
Goodwill and other intangible assets	4. Goodwill and other intangible assets: Intangible assets subject to amortization are summarized as follows: Yen in millions March 31 2015 2016 Gross carrying amounts Accumulated amortization Carrying amounts Gross carrying amounts Accumulated amortization Carrying amounts Proprietary technology ¥ ¥ ¥ ¥ ¥ ¥ Customer relationships Software Other Total ¥ ¥ ¥ ¥ ¥ ¥ The weighted average amortization periods for proprietary technology, customer relationships and software are 12 years, 18 years and 6 years, respectively. Total amortization of intangible assets for the years ended March 31, 2014, 2015 and 2016 amounted to ¥6,393 million, ¥7,206 million and ¥ 8,288 million, respectively. Total indefinite lived intangible assets amounted to ¥12,262 million and ¥ 11,844 million as of March 31, 2015 and 2016, respectively. The estimated aggregate amortization expense for intangible assets for the next five years is as follows: Years ending March 31, Yen in millions 2017 ¥ 2018 2019 2020 2021 NIDEC has completed the annual impairment test for existing goodwill and indefinite lived intangible assets as required by ASC 350 as of January 1, 2016. For the years ended March 31, 2014, 2015 and 2016, NIDEC has determined that the fair value of each reporting unit which includes goodwill has been in excess of its carrying amount. Accordingly, for the years ended March 31, 2014, 2015 and 2016, no goodwill impairment loss has been recorded. As a result of the annual impairment test for existing indefinite lived intangible assets, for the years ended March 31, 2014, 2015 and 2016, impairment loss of indefinite lived intangible assets has not been recorded. The changes in the carrying amount of goodwill by operating reportable segment for the years ended March 31, 2015 are as follows: Yen in millions Balance as of April 1, 2014 Acquisition Impairment loss Translation adjustments and Others Balance as of March 31, 2015 Goodwill: Nidec Electronics (Thailand) ¥ ¥ — ¥ — ¥ ¥ Nidec Sankyo — — Nidec Copal — — — Nidec Techno Motor — — — Nidec Motor — — Nidec Motors & Actuators — All Others — — ¥ ¥ ¥ — ¥ ¥ The changes in the carrying amount of goodwill by operating reportable segment for the years ended March 31, 2016 are as follows: Yen in millions Balance as of April 1, 2015 Acquisition Impairment loss Translation adjustments and Others Balance as of March 31, 2016 Goodwill: Nidec Electronics (Thailand) ¥ ¥ — ¥ — ¥ ¥ Nidec Sankyo — ) Nidec Copal — — — Nidec Techno Motor — — — Nidec Motor — ) Nidec Motors & Actuators — — ) All Others — ) ¥ ¥ ¥ — ¥ ) ¥ NIDEC has partially reclassified reportable segment. Accordingly, previous period amounts have been reclassified. Reportable segment information is described in Notes 23 (2).

Supplemental cash flow informat

Supplemental cash flow information	12 Months Ended
	Mar. 31, 2016
Supplemental cash flow information
Supplemental cash flow information	5. Supplemental cash flow information: The supplemental information associated with the consolidated statements of cash flows for the years ended March 31, 2014, 2015 and 2016 are as follows: Yen in millions For the year ended March 31 2014 2015 2016 Cash paid during the fiscal year for: Income taxes ¥ ¥ ¥ Interest Non-cash investing and financing activities: Capital lease obligations Conversion of convertible bond — Change in ownership of subsidiaries in connection with share exchange transaction —Change in common stock — —Change in treasury stock —

Allowance for doubtful accounts

Allowance for doubtful accounts	12 Months Ended
	Mar. 31, 2016
Allowance for doubtful accounts
Allowance for doubtful accounts	6. Allowance for doubtful accounts: NIDEC estimates losses for uncollectible accounts based on historical experience and the evaluation of the likelihood of success in collecting specific customer receivables. An analysis of activity within the allowance for doubtful accounts for the years ended March 31, 2014, 2015 and 2016 are as follows: Yen in millions 2014 2015 2016 Allowance for doubtful accounts at beginning of the year ¥ ¥ ¥ Provision for doubtful accounts, net of reversal ) Write-offs ) ) ) Translation adjustment and other ) Allowance for doubtful accounts at the end of the year ¥ ¥ ¥

Inventories

Inventories	12 Months Ended
	Mar. 31, 2016
Inventories
Inventories	7. Inventories: Inventories consist of the following: Yen in millions March 31 2015 2016 Finished goods ¥ ¥ Raw materials Work in process Supplies and other ¥ ¥

Other current assets

Other current assets	12 Months Ended
	Mar. 31, 2016
Other current assets
Other current assets	8. Other current assets: Other current assets as of March 31, 2015 and 2016 consist of the following: Yen in millions March 31 2015 2016 Other receivable ¥ ¥ Deferred tax assets (Note 16) Costs on uncompleted construction contracts Prepaid expenses Other ¥ ¥

Marketable securities and other

Marketable securities and other securities investments	12 Months Ended
	Mar. 31, 2016
Marketable securities and other securities investments
Marketable securities and other securities investments	9. Marketable securities and other securities investments: Marketable securities and other securities investments include debt and equity securities of which the aggregate fair value, gross unrealized gains and losses and cost are as follows: Yen in millions March 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Available-for-sale Equity securities ¥ ¥ ¥ — ¥ Debt securities — — Held-to-maturity Japanese government debt securities — ¥ ¥ ¥ — ¥ Securities not practicable to estimate fair value Equity securities ¥ Yen in millions March 31, 2016 Cost Gross unrealized gains Gross unrealized losses Fair value Available-for-sale Equity securities ¥ ¥ ¥ ¥ Debt securities — — Held-to-maturity Japanese government debt securities — ¥ ¥ ¥ ¥ Securities not practicable to estimate fair value Equity securities ¥ During the years ended March 31, 2014, 2015 and 2016, the net unrealized gain on available-for-sale securities included as a component of accumulated other comprehensive income, net of applicable taxes, increased by ¥2,998 million, increased by ¥3,227 million and decreased by ¥ 3,714 million, respectively. Proceeds from sale of marketable securities were ¥1,059 million, ¥68 million and ¥ 1, 319 million for the years ended March 31, 2014, 2015 and 2016, respectively. On those sales, gross realized gains were ¥242 million, ¥26 million and ¥ 943 million, respectively. On the other hand, gross realized losses were ¥12 million for the years ended March 31, 2014 and did not occur for the year ended March 31, 2015. For the year ended March 31, 2016, gross realized losses were ¥ 1 million. NIDEC holds long-term investment securities that are classified as “marketable securities and other securities investments.” The securities issued by various non-public companies are recorded at cost, as their fair values are not readily determinable. NIDEC’s management employs a systematic methodology to assess the recoverability of such investments by reviewing the financial position of the underlying companies and the prevailing market conditions in which these companies operate to determine if NIDEC’s investment in each individual company is impaired and whether the impairment is other-than-temporary. If any impairment is assessed to be other-than-temporary, the cost of the investment is written-down by the impaired amount and the amount is recognized as a realized loss for the reporting period which the assessment is made. The following tables present the gross unrealized losses on, and fair value of, NIDEC’s investment securities, aggregated by investment category and length of time that individual investment securities have been in a continuous unrealized loss position. Yen in millions March 31, 2015 Less than 12 months 12 months or more Fair value Unrealized loss Fair value Unrealized loss Equity securities ¥ — ¥ — ¥ — ¥ — Debt securities — — — — ¥ — ¥ — ¥ — ¥ — Yen in millions March 31, 2016 Less than 12 months 12 months or more Fair value Unrealized loss Fair value Unrealized loss Equity securities ¥ ¥ ¥ — ¥ — Debt securities — — — — ¥ ¥ ¥ — ¥ — NIDEC presumes the value of investment securities is impaired if the fair value is below the original cost. Among the impaired investment securities, if the fair value is significantly below the original cost for an extended period of time, NIDEC presumes a decline in value of debt and equity securities is other-than-temporary and the impaired amount is recognized as a realized loss. The presumption of an other-than-temporary impairment may be overcome if there is evidence to support that the decline is temporary in nature due to the existence of other factors which overcome the duration or magnitude of the decline. However, even if a fair value is not significantly less than the original cost, the impaired amount is recognized as a realized loss when specific factors indicate the decline in the fair value is other-than-temporary. For the years ended March 31, 2015 and 2016, held-to-maturity securities of ¥400 million and ¥ 901 million were pledged as collateral for the deferred payments of certain taxes based on the Japanese Custom Act and Consumption Tax Law, respectively.

Other non-current assets

Other non-current assets	12 Months Ended
	Mar. 31, 2016
Other non-current assets
Other non-current assets	10. Other non-current assets: Other non-current assets as of March 31, 2015 and 2016 consist of the following: Yen in millions March 31 2015 2016 Intangible assets *1 ¥ ¥ Other *2 ¥ ¥ Notes: *1 “Intangible assets” information is described in Note 4 “Goodwill and other intangible assets”. *2 “Other” primarily consists of long-term prepaid expenses.

Short-term borrowings and long-

Short-term borrowings and long-term debt	12 Months Ended
	Mar. 31, 2016
Short-term borrowings and long-term debt
Short-term borrowings and long-term debt	11. Short-term borrowings and long-term debt: Short-term borrowings at March 31, 2015 and 2016 consist of the following: Yen in millions March 31 2015 2016 Unsecured loans, principally from banks with average interest at March 31, 2015 and 2016 of 0.17% and 0.23% per annum, respectively ¥ ¥ Secured loans, principally from banks with average interest at March 31, 2016 of 5.98% per annum — ¥ ¥ As of March 31, 2016, NIDEC had unused lines of credit amounting to ¥ 218,973 million with banks. Under these programs, NIDEC is authorized to obtain short-term financing at prevailing interest rates. Long-term debt at March 31, 2015 and 2016 are comprised of the following: Yen in millions March 31 2015 2016 Unsecured loans, representing obligations principally to banks Due 2015 to 2026 in 2015 with interest ranging from 0.17% to 6.40% per annum in 2015 ¥ — Due 2016 to 2026 in 2016 with interest ranging from 0.00% to 14.79% per annum in 2016 — ¥ Secured loans, representing obligations principally to banks Due 2015 to 2024 in 2015 with interest ranging from 1.45% to 3.50% per annum in 2015 — Due 2016 to 2023 in 2016 with interest ranging from 1.95% to 3.50% per annum in 2016 — Zero coupon convertible bonds due 2015 Convertible at ¥5,313 for one common share — Unsecured straight bonds due 2017 Interest at 0.39% per annum in 2015 and 2016 Unsecured straight bonds due 2019 Interest at 0.60% per annum in 2015 and 2016 Unsecured straight bonds due 2022 Interest at 0.96% per annum in 2015 and 2016 Unsecured straight bonds due 2016 Interest at 0.21% per annum in 2015 and 2016 Capital lease obligations Due 2015 to 2020 in 2015, with interest ranging from 0.00% to 15.74 % per annum in 2015 — Due 2016 to 2023 in 2016, with interest ranging from 0.00% to 15.74 % per annum in 2016 — Less - Bonds current portion due within one year ) ) Less - Long-term debt current portion due within one year ) ) Less - Capital lease obligation current portion due within one year ) ) ¥ ¥ Detail of Euro Yen denominated zero coupon convertible bonds due 2016 is as follows; Yen in millions March 31 2015 2016 Principal amount ¥ ¥ — Unamortized premium — Total ¥ ¥ — The Euro Yen Convertible Bonds with Stock Acquisition Rights due 2015, which were listed at Singapore Stock Exchange, were issued on September 21, 2010, and were redeemable at 100% of principal amount on September 18, 2015 (maturity date). On April 1, 2014, the Company completed a two-for-one stock split. As a result, the conversion price of the Company’s Euro Yen Convertible Bonds with Stock Acquisition Rights due 2015 is adjusted from ¥10,626 to ¥5,313 and the number of potential shares based on conversion options associated with the convertible bonds is changed from 9,010,916 to 18,021,833, pursuant to the Terms and Conditions of the Bonds set forth in the Offering Circular. The bonds are included in the calculation of diluted earnings per share as their impact is dilutive. During the six months ended September 30, 2015, the bonds as of March 31, 2015 had been fully converted into common stock due to exercises of stock acquisition rights, which led to the allocation of treasury stock and issuances of new shares. The exercises of stock acquisition rights are a non-cash financing activity. NIDEC was not required to bifurcate any of the embedded features contained in the bonds for accounting purposes. The aggregate amounts of annual maturity of long-term debt after March 31, 2016 are as follows: Yen in millions Year ending March 31 2017 ¥ 2018 2019 2020 2021 2022 and thereafter ¥ Standard agreements with certain banks in Japan include provisions that collateral (including sums on deposit with such banks) or guarantees will be furnished upon the banks’ request and that any collateral furnished, pursuant to such agreements or otherwise, will be applicable to all present or future indebtedness to such banks. As of March 31, 2016, certain subsidiary pledges machinery, land and building with the sum of book value of ¥ 2,744 million as collateral for ¥ 1,414 million of short-term borrowings, current portion of long-term debt and long-term debt. Among them, pledged asset of factory foundation is building of ¥854 million and corresponding debt is short-term borrowings of ¥88 million.

Other current liabilities

Other current liabilities	12 Months Ended
	Mar. 31, 2016
Other current liabilities
Other current liabilities	12. Other current liabilities: Other current liabilities as of March 31, 2015 and 2016 consist of the following: Yen in millions March 31 2015 2016 Accounts payable for property, plant and equipment ¥ ¥ Advances received Income taxes payable Product warranty liabilities Other ¥ ¥ “Other” primarily consists of accrued consumption taxes.

Pension and severance plans

Pension and severance plans	12 Months Ended
	Mar. 31, 2016
Pension and severance plans
Pension and severance plans	13. Pension and severance plans: The Company and certain subsidiaries sponsor pension and retirement plans, which entitle employees, under most circumstances, to lump-sum indemnities or pension payments based on current rates of pay and length of service or the number of “points.” Under normal circumstances, the minimum payment prior to retirement age is an amount based on voluntary retirement. Employees receive additional benefits upon involuntary retirement, including retirement at the mandatory retirement age. For the year ended March 31, 2015, certain subsidiaries in Japan modified the terms of the defined benefit plan. According to the changes, gains and loss from prior service credit were recognized in consolidated financial statements. Information regarding NIDEC’s employees’ defined benefit plans is as follows: Japanese plans: Yen in millions March 31 2015 2016 Change in benefit obligation: Benefit obligation at beginning of year ¥17,666 ¥18,194 Service cost Interest cost Actuarial loss Plan amendment ) — Benefits paid ) ) Change in plan assets: Fair value of plan assets at beginning of year Actual return on plan assets Employer contribution Benefits paid ) ) Fair value of plan assets at end of year Funded status ¥(3,265 ) ¥(4,323 ) Amounts included in the consolidated balance sheet are comprised of: Yen in millions March 31 2015 2016 Accrued pension and severance costs ¥ ¥ Other non-current assets ) ) Net amounts recognized ¥ ¥ Amounts included in accumulated other comprehensive income (loss) as pension liability adjustments are comprised of: Yen in millions March 31 2015 2016 Actuarial loss ¥ ) ¥ Prior service credit Pension liability adjustments, pre-tax ¥ ) ¥ The accumulated benefit obligations for all defined benefit pension plans were ¥ 17,876 million and ¥ 19,447 million for the years ended March 31, 2015 and 2016, respectively. The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for which the accumulated benefit obligations exceed plan assets are as follows: Yen in millions March 31 2015 2016 Projected benefit obligations ¥11,056 ¥11,233 Accumulated benefit obligations ¥10,763 ¥10,812 Fair value of plan assets ¥ ¥ Weighted-average assumptions used to determine benefit obligations as of March 31, 2015 and 2016 are as follows: March 31 2015 2016 Discount rate % % Rate of compensation increase % % Weighted-average assumptions used to determine net pension and severance costs for the years ended March 31, 2014, 2015 and 2016 are as follows: For the year ended March 31 2014 2015 2016 Discount rate % % % Expected return on plan assets % % % Rate of compensation increase % % % Yen in millions For the year ended March 31 2014 2015 2016 Components of net periodic (benefit) cost: Service cost ¥ ¥ ¥ Interest cost Expected return on plan assets ) ) ) Amortization of net actuarial loss Amortization of prior service credit ) ) ) Net periodic pension cost ¥ ¥ ¥ Prior service cost and actuarial gain and loss are amortized using the straight-line method over the average remaining service period of active employees. The estimated prior service credit and net actuarial loss for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost for the year ending March 31, 2017 are ¥ 170 million and ¥ 173 million, respectively. Foreign plans: Yen in millions March 31 2015 2016 Change in benefit obligation: Benefit obligation at beginning of year ¥ ¥ Service cost Interest cost Actuarial gain(loss) ) Settlement — ) Acquisition and other ) ) Foreign currency exchange rate changes ) Benefits paid ) ) Change in plan assets: Fair value of plan assets at beginning of year Actual return on plan assets Employer contribution Settlement ) ) Foreign currency exchange rate changes and other ) Benefits paid ) ) Fair value of plan assets at end of year Funded status ¥ ) ¥ ) Amounts included in the consolidated balance sheet are comprised of: Yen in millions March 31 2015 2016 Accrued pension and severance costs ¥ ¥ Other non-current assets — ) Net amounts recognized ¥ ¥ Amounts included in accumulated other comprehensive income (loss) as pension liability adjustments are comprised of: Yen in millions March 31 2015 2016 Actuarial gain(loss) ¥ ) ¥ ) Pension liability adjustments, pre-tax ¥ ) ¥ ) The accumulated benefit obligations for all defined benefit pension plans were ¥ 25,936 million and ¥ 24,189 million for the years ended March 31, 2015 and 2016, respectively. The projected benefit obligations, accumulated benefit obligations and fair value of plan assets for which the accumulated benefit obligations exceed plan assets are as follows: Yen in millions March 31 2015 2016 Projected benefit obligations ¥27,045 ¥23,815 Accumulated benefit obligations Fair value of plan assets ¥ ¥ Weighted-average assumptions used to determine benefit obligations as of March 31, 2015 and 2016 are as follows: March 31 2015 2016 Discount rate % % Rate of compensation increase % % Weighted-average assumptions used to determine net pension and severance costs for the years ended March 31, 2014, 2015 and 2016 are as follows: For the year ended March 31 2014 2015 2016 Discount rate % % % Expected return on plan assets % % % Rate of compensation increase % % % Yen in millions For the year ended March 31 2014 2015 2016 Components of net periodic (benefit) cost: Service cost ¥ ¥ ¥ Interest cost Expected return on plan assets ) ) ) Amortization of net actuarial loss Net periodic pension cost ¥ ¥ ¥ Actuarial gain and losses are amortized using the straight-line method over the average remaining service period of active employees. The estimated net actuarial losses for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost for the year ending March 31, 2017 is ¥ 92 million. Japanese plans and foreign plans: NIDEC’s policy and objective for plan asset management is to generate a stable return on the investment over the long term, which enables NIDEC’s pension funds to meet future benefit payment requirements under risks which NIDEC considers permissible. NIDEC formulates “basic” portfolio that suits the above-mentioned policy, and ensures that plan assets are allocated under this “basic” portfolio. NIDEC evaluates its actual return and revises the “basic” portfolio, if necessary. NIDEC’s portfolio for plans consists of three major components: approximately 2% is invested in equity securities, approximately 5% is invested in debt securities, and approximately 93% is invested in other investment vehicles, primarily consisting of investments in pooled funds and life insurance company general accounts. The equity securities are selected from stocks that are listed on the securities exchanges. The debt securities are selected from Japanese and foreign government bonds, public debt instruments, and corporate bonds. Pooled funds included in other assets invest in equity and debt securities in mixture selected from same as above two categories. As for investments in life insurance company general accounts, the contracts with the insurance companies include a guaranteed interest rate and return of capital. The three levels of input used to measure fair value are more fully described in Note 19. The fair values of NIDEC’s pension plan assets at March 31, 2015 and 2016, by asset category, are as follows: Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2015 Level 1 Level 2 Level 3 Equity securities: Japanese companies ¥ ¥ ¥ — ¥ — Foreign companies — — Debt securities: Pooled funds *1 — — Other assets: Cash and cash equivalents — — Life insurance company general accounts — — Pooled funds *2 — — Others — — Total ¥ ¥ ¥ ¥ — *1 These funds invest in approximately 65 % Japanese bonds, 35 % foreign bonds. *2 These funds primarily invest in listed equity securities consisting of approximately 4 % Japanese companies and 28 % foreign companies, and debt security consisting of approximately 7 % Japanese bonds and 47 % foreign bonds. Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2016 Level 1 Level 2 Level 3 Equity securities: Japanese companies ¥ ¥ ¥ — ¥ — Foreign companies — — Debt securities: Pooled funds *1 — — Other assets: Cash and cash equivalents — — Life insurance company general accounts — — Pooled funds *2 — — Others — — Total ¥ ¥ ¥ ¥ — *1 These funds invest in approximately 65 % Japanese bonds, 35 % foreign bonds. *2 These funds primarily invest in listed equity securities consisting of approximately 9 % Japanese companies and 27 % foreign companies, and debt security consisting of approximately 8 % Japanese bonds and 46 % foreign bonds. Level 1 assets are comprised primarily of cash and cash equivalents and equity securities, which are valued using an unadjusted quoted market price in active markets with sufficient volume and frequency of transactions. Level 2 assets are comprised primarily of pooled funds that invest in equity and debt securities, and investments in life insurance company general accounts. Pooled funds are valued at their net asset values that are calculated by the sponsor of the fund and have daily liquidity. The net asset value is based on the fair value of the underlying assets owned by the fund, minus its liabilities then divided by the number of units outstanding. Investments in life insurance company general accounts are valued at conversion value. NIDEC expects to contribute approximately ¥ 1,801 million to its defined benefit plans for the year ending March 31, 2017. The future benefit payments for defined benefit plans are expected as follows: Yen in millions Japanese plans Foreign plans 2017 ¥ ¥ 2018 2019 2020 2021 Years 2022-2026 ¥ ¥ Certain subsidiaries have a number of multiemployer plans. Total amounts of cost recognized for certain subsidiaries’ contributions to the plans were ¥169 million, ¥169 million and ¥ 115 million for the years ended March 31, 2014, 2015 and 2016, respectively. NIDEC expects to contribute approximately ¥ 109 million for the year ending March 31, 2017. Certain subsidiaries have a number of defined contribution plans. Total amounts of cost recognized for certain subsidiaries’ contribution to the plans were ¥2,617 million, ¥3,103 million and ¥ 3,270 million for the years ended March 31, 2014, 2015 and 2016, respectively. NIDEC expects to contribute approximately ¥ 3,301 million for the year ending March 31, 2017.

Other long-term liabilities

Other long-term liabilities	12 Months Ended
	Mar. 31, 2016
Other long-term liabilities
Other long-term liabilities	14. Other long-term liabilities: Other long-term liabilities as of March 31, 2015 and 2016 consist of the following: Yen in millions March 31 2015 2016 Deferred tax liabilities (Note 16) ¥ ¥ Other ¥ ¥ “ Other” primarily consists of u nrecognized tax benefits, accrued interest and penalty.

Equity

Equity	12 Months Ended
	Mar. 31, 2016
Equity
Equity	15. Equity: The Japanese Company Law (the “Company Law”) provides that an amount equal to 10% of cash dividends from retained earnings by the Company and its Japanese subsidiaries must be appropriated as a legal reserve. No further appropriations are required when the sum of the legal reserves reaches 25% of stated capital. These reserves currently exceed 25% of stated capital and are available for dividends under the Company Law subject to approval at the shareholders’ meeting. Certain foreign subsidiaries are also required to appropriate their earnings to legal reserves under the laws of the respective countries. The amount of statutory retained earnings of the Company available for dividend payments to shareholders was ¥185,289 million and ¥ 166,429 million for the years ended March 31, 2015 and 2016, respectively. In accordance with customary practice in Japan, the appropriations are not accrued in the financial statements for the period to which they relate, but are recorded in the subsequent accounting period. Retained earnings for the year ended March 31, 2016 includes amounts representing final cash dividends of ¥11,864 million, ¥40 per share. Repurchased treasury stock is not entitled to a dividend under the Company Law. NIDEC resolved to repurchase its own shares at several meetings of its Board of Directors during the years ended March 31, 2015 and 2016. In accordance with the resolution, NIDEC repurchased 1,530,000 shares of treasury stock for the aggregate cost of ¥12,013 million during the year ended March 31, 2016. NIDEC owned 36 shares, or ¥0 million and 1,541,210 shares, or ¥12,111 million of treasury stock repurchased for the years ended March 31, 2015 and 2016, which were restricted regarding the payment of cash dividend. On October 1, 2013, NIDEC made the Nidec Copal Corporation (“NCPL”) a wholly owned subsidiary through a share exchange transaction. NIDEC allocated 4,856,764 shares of its common stock held in treasury to holders of NCPL stock in connection with the share exchange transaction. As a result of the share exchange transaction, NIDEC’s equity interest in NCPL increased from 66.5% to 100%. On October 1, 2013, NIDEC made the Nidec Tosok Corporation (“NTSC”) a wholly owned subsidiary through a share exchange transaction. NIDEC allocated 2,624,000 shares of its common stock held in treasury to holders of NTSC stock in connection with the share exchange transaction. As a result of the share exchange transaction, NIDEC’s equity interest in NTSC increased from 72.3% to 100%. On October 1, 2014, NIDEC made the Nidec Copal Electronics Corporation (“NCEL”) a wholly owned subsidiary through a share exchange transaction. NIDEC allocated 3,160,575 shares of its common stock held in treasury to holders of NCEL stock in connection with the share exchange transaction. As a result of the share exchange transaction, NIDEC’s equity interest in NCEL increased from 65.4% to 100%. On October 1, 2014, NIDEC made the Nidec-Read Corporation (“NRCJ”) a wholly owned subsidiary through a share exchange transaction. NIDEC allocated 1,421,498 shares of its common stock held in treasury to holders of NRCJ stock in connection with the share exchange transaction. As a result of the share exchange transaction, NIDEC’s equity interest in NRCJ increased from 65.5% to 100%. NIDEC implemented a two-for-one stock split on NIDEC’s common stock as of April 1, 2014. Retained earnings relating to equity in undistributed earnings reflect ¥168 million, ¥155 million and ¥167 million of accumulated deficit of the companies accounted for by the equity method for the years ended March 31, 2014, 2015 and 2016. The changes in accumulated other comprehensive income (loss) by component are as follows: Yen in Millions Foreign currency translation adjustments Net unrealized gains (losses) from securities Net gains (losses) from derivative instruments Pension liability adjustments Total For the year ended March 31, 2015: Balance at March 31, 2014 ) ) Other comprehensive income (loss) before reclassifications ) ) Amounts reclassified from accumulated other comprehensive income (loss) ) ) ) ) Net change during the current period other comprehensive income (loss) ) ) Balance at March 31, 2015 ) ) Yen in Millions Foreign currency translation adjustments Net unrealized gains (losses) from securities Net gains (losses) from derivative instruments Pension liability adjustments Total For the year ended March 31, 2016: Balance at March 31, 2015 ) ) Other comprehensive income (loss) before reclassifications ) ) ) ) ) Amounts reclassified from accumulated other comprehensive income (loss) ) Net change during the current period other comprehensive income (loss) ) ) ) ) Balance at March 31, 2016 ) ) Reclassification out of accumulated other comprehensive income (loss) are as follows: Yen in Millions Amount Reclassified from Accumulated other comprehensive income (loss) *1 Affected line items in consolidated statement of income For the year ended March 31, 2015: Foreign currency translation adjustments ) Other, net, Selling,general and administrative expenses — Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net unrealized gains (losses) from securities ) Gain from marketable securities, net Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net gains (losses) from derivative instruments Cost of products sold, Interest expense ) Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Pension liability adjustments ) *2 Income taxes ) Consolidated net income Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Total amount reclassified, net of tax and noncontrolling interests ) *1 Amounts in parentheses indicate gains in consolidated statement of income. *2 This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. Yen in Millions Amount Reclassified from Accumulated other comprehensive income (loss) *1 Affected line items in consolidated statement of income For the year ended March 31, 2016: Foreign currency translation adjustments Other, net, Selling,general and administrative expenses — Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Net unrealized gains (losses) from securities ) Gain from marketable securities, net Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net gains (losses) from derivative instruments Cost of products sold, Interest expense ) Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Pension liability adjustments *2 ) Income taxes Consolidated net income ) Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Total amount reclassified, net of tax and noncontrolling interests *1 Amounts in parentheses indicate gains in consolidated statement of income. *2 This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. Tax effects allocated to each component of other comprehensive income (loss) and reclassification adjustments, including amounts attributable to noncontrolling interests for the years ended March 31, 2014, 2015 and 2016 are as follows: Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2014: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ¥ — ¥ Reclassification adjustments for gains and losses realized in net income — — — Net unrealized gains (losses) from securities: Unrealized holding gains (losses) arising during period ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) ) Pension liability adjustment: Actuarial gains (losses) arising during period ) Prior service cost arising during period ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ¥ ) ¥ Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2015: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ¥ — ¥ Reclassification adjustments for gains and losses realized in net income ) — ) Net unrealized gains (losses) from securities: Unrealized holding gains (losses)arising during period ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) Pension liability adjustment: Actuarial gains (losses) arising during period ) ) Prior service cost arising during period ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ¥ ¥ Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2016: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ) ¥ — ¥ ) Reclassification adjustments for gains and losses realized in net income — Net unrealized gains (losses) from securities: Unrealized holding gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) Pension liability adjustment: Actuarial gains (losses) arising during period ) ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ) ¥ ¥ )

Income taxes

Income taxes	12 Months Ended
	Mar. 31, 2016
Income taxes
Income taxes	16. Income taxes: The components of income before income taxes comprise the following: Yen in millions For the year ended March 31 2014 2015 2016 Income (loss) before income taxes: The Company and domestic subsidiaries ¥ ¥ ¥ Foreign subsidiaries ¥ ¥ ¥ The provision for income taxes consists of the following: Yen in millions For the year ended March 31 2014 2015 2016 Current income tax expense/(benefit): The Company and domestic subsidiaries ¥ ¥ ¥ Foreign subsidiaries Total current Deferred income tax expense (benefit): The Company and domestic subsidiaries Foreign subsidiaries Total deferred Total provision ¥ ¥ ¥ NIDEC is subject to a number of different income taxes, which, in the aggregate, indicate a statutory rate in Japan of approximately 38.0% in 2014, approximately 36.0% in 2015 and approximately 33.0 % in 2016. Reconciliation of the differences between the statutory tax rate and the effective income tax rate is as follows: For the year ended March 31 2014 2015 2016 Statutory tax rate % % % Increase (reduction) in taxes resulting from: Tax benefit in foreign subsidiaries ) ) ) Tax on undistributed earnings Valuation allowance ) ) ) Liabilities for unrecognized tax benefits ) Reversal of deferred tax assets related to foreign tax credit — — Deduction for foreign taxes Withholding tax on dividends from overseas subsidiaries Changes in Japanese income tax rates Other ) ) Effective income tax rate % % % The effective income tax rate decreased 4.9 percentage points from 27.1% for the year ended March 31, 2015 to 22.2 % for the year ended March 31, 2016. On March 29, 2016, the national diet of Japan enacted the 2016 tax reform bill, which resulted in various changes to the calculation of statutory income taxes for companies were promulgated in Japan. The statutory tax rate used for calculating deferred tax assets and liabilities, where temporary differences would be realized after April 1, 2016, was accordingly reduced from approximately 33.0% or approximately 32.2% to approximately 31.0%, as applicable. Tax benefit in foreign subsidiaries primarily relates to income sourced from foreign subsidiaries mainly in Thailand and the Philippines. In Thailand, NIDEC received privileges under the promotional certificates issued in March and August 2010. Under these privileges, NIDEC received an exemption from corporate income tax for a period of eight years from the date of commencement of certain revenue-generating activities identified by the promotional certificate. In the Philippines, NIDEC received certain tax incentives in September 2015, which included an income tax holiday for four years. The aggregate amounts and per share effects of tax holidays are as follows: Yen in millions For the year ended March 31 2014 2015 2016 Aggregate amounts of tax holidays ¥ ¥ ¥ Yen Per share - Basic ¥ ¥ ¥ - Diluted ¥ ¥ ¥ NIDEC implemented a two-for-one stock split on our common stock effective April 1, 2014. Therefore, the per share effects of tax holidays have been accordingly adjusted to reflect the effect of the stock split. The significant components of deferred tax assets and liabilities are as follows: Yen in millions March 31 2015 2016 Deferred tax assets: Inventories ¥ ¥ Property, plant and equipment Accrued bonus Accrued enterprise tax Pension and severance plans Operating loss carryforwards for tax purposes Accrued vacation Accrued expenses Other Gross deferred tax assets Less - Valuation allowance ) ) Net deferred tax assets Deferred tax liabilities: Basis difference of acquired assets ) ) Undistributed earnings not permanently reinvested ) ) Marketable securities ) ) Intangible assets ) ) Other ) ) Total deferred tax liabilities ) ) Net deferred tax liabilities ¥ ) ¥ ) Operating loss carryforwards for tax purposes on March 31, 2016 in Japan and foreign countries amounted to approximately ¥ 19,571million and are available as an offset against future taxable income. With the exception of ¥ 4,412 million with no expiration period, the majority of these carryforwards expire in years 2017 to 2036. The valuation allowance mainly relates to deferred tax assets of consolidated subsidiaries with operating loss carryforwards for tax purposes that are not expected to be realized. The net changes in the total valuation allowance for deferred tax assets for the years ended March 31, 2014, 2015 and 2016 consist of the following: Yen in millions March 31 2014 2015 2016 Valuation allowance at beginning of year ¥ ) ¥ ) ¥ ) Additions ) ) ) Deductions Impact on newly acquired companies ) — — Valuation allowance at end of year ¥ ) ¥ ) ¥ ) Deferred tax assets and deferred tax liabilities are included in the consolidated balance sheets as follows: Yen in millions March 31 2015 2016 Deferred tax assets: Other current assets ¥ ¥ Other non-current assets Deferred tax liabilities: Other current liabilities ) ) Other long-term liabilities ) ) Net deferred tax liabilities ¥ ) ¥ ) Management of NIDEC intends to reinvest certain undistributed earnings of foreign subsidiaries for an indefinite period of time. As a result, no deferred tax liability has been recorded on undistributed earnings of these subsidiaries, which are not expected to be remitted in the foreseeable future, aggregating ¥285,085 million as of March 31, 2016. NIDEC estimates an additional deferred tax liability of ¥ 20,976 million would be required at such time if the full amount of these accumulated earnings were expected to be remitted. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: Yen in millions For the year ended March 31, 2014 2015 2016 Balance at April 1 ¥ ¥ ¥ Additions for tax positions of the current year Reduction for tax positions of prior years ) — ) Impact on newly acquired companies — — Balance at March 31 ¥ ¥ ¥ Total amount of unrecognized tax benefits that would reduce the effective tax rate, if recognized, is ¥ 2,848 million. Although NIDEC believes its estimates and assumptions of unrecognized tax benefits are reasonable, uncertainty regarding the final determination of tax audit settlements and any related litigation could affect the effective tax rate in the future periods. A significant change to the unrecognized tax benefits might occur within the next twelve months. NIDEC does not expect that such change will have a significant impact on consolidated results of operations and financial position. NIDEC recognizes interest and penalties related to unrecognized tax benefits as a component of other, net in the consolidated statements of income. The interest and penalties for the fiscal years ended March 31, 2014, 2015 and 2016, respectively, had no material impact on its consolidated results of operations. The total gross accrued interest and penalty were ¥ 96 million and ¥ 147 million at March 31, 2015 and 2016, respectively. NIDEC remains subject to income tax examination for the tax returns related to the years beginning on and after April 1, 2009, with various tax jurisdictions including Japan.

Reconciliation of the differenc

Reconciliation of the differences between basic and diluted earnings per share	12 Months Ended
	Mar. 31, 2016
Reconciliation of the differences between basic and diluted earnings per share
Reconciliation of the differences between basic and diluted earnings per share	17. Reconciliation of the differences between basic and diluted earnings per share: The tables below set forth a reconciliation of the differences between basic and diluted net income attributable to Nidec Corporation per share for the years ended March 31, 2014, 2015 and 2016. Yen in millions Thousands of shares Yen Net income attributable to Nidec Corporation Weighted- average shares Net income attributable to Nidec Corporation per share For the year ended March 31, 2014: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ For the year ended March 31, 2015: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Yen in millions Thousands of shares Yen Net income attributable to Nidec Corporation Weighted- average shares Net income attributable to Nidec Corporation per share For the year ended March 31, 2016: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥

Derivatives

Derivatives	12 Months Ended
	Mar. 31, 2016
Derivatives
Derivatives	18. Derivatives: NIDEC manages the exposures to fluctuations in foreign exchange rate, interest rate and commodity prices through the use of derivative financial instruments which include foreign exchange forward contracts, interest rate swap agreements, currency swap agreements and commodity futures contracts. NIDEC does not hold derivative financial instruments for trading purpose. NIDEC is exposed to credit risk in the event of non-performance by counterparties to the derivative contracts, but such risk is considered to be mitigated by the high credit rating of the counterparties. Cash flow hedges NIDEC uses foreign exchange forward contracts, interest rate swap agreements, and commodity futures contracts designated as cash flow hedges to protect against a portion of foreign exchange rate risks, interest rate risks and commodity prices risks inherent in its forecasted transactions related to purchase commitments. Derivatives not designated as hedges NIDEC is unable or has elected not to apply hedge accounting to some of these derivatives from time to time. The changes in the fair value of these contracts are recorded in “Other income (expense)”. The contractual amounts outstanding of derivative instruments Derivatives designated as cash flow hedges are as follows: Yen in millions March 31, 2015 March 31, 2016 Foreign exchange forward contracts ¥ ¥ Interest rate swap agreements — Commodity futures Derivatives not designated as hedging instruments are as follows: Yen in millions March 31, 2015 March 31, 2016 Foreign exchange forward contracts ¥ ¥ Currency swap contracts — Fair values of derivative instruments Derivatives designated as cash flow hedges are as follows: Asset Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current assets ¥ ¥ — Commodity futures Other current assets Liability Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current liabilities ¥ ¥ Interest rate swap agreements Other current liabilities — Commodity futures Other current liabilities Derivatives not designated as hedging instruments are as follows: Asset Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Currency swap contracts Other current assets — Liability Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current liabilities ¥ ¥ Currency swap contracts Other current liabilities — The effect of derivative instruments on the consolidated statements of income for the year ended March 31 Derivatives designated as cash flow hedges are as follows: Gains (losses) recognized in accumulated other comprehensive income Yen in millions For the year ended March 31 2014 2015 2016 Foreign exchange forward contracts ¥ ) ¥ ) ¥ Interest rate swap agreements ) Commodity futures ) Gains (losses) reclassified from accumulated other comprehensive income into income (effective portion) Statement of Yen in millions income For the year ended March 31 location 2014 2015 2016 Foreign exchange forward contracts Cost of sales ¥ ¥ ¥ ) Interest rate swap agreements Interest expense ) ) ) Commodity futures Cost of sales ) ) ) The amount of hedge ineffectiveness and net gains (losses) excluded from the assessment of hedge effectiveness was not material for the year ended March 31, 2016. A net loss of ¥ 714 million in accumulated other comprehensive income at March 31, 2016 is expected to be reclassified into earnings within the next 12 months. As of March 31, 2016, the maximum length of time over which NIDEC hedged its exposure to variability in future cash flows for forecasted transactions was approximately 23 months. Derivatives not designated as hedging instruments are as follows: Gains (losses) recognized in income Statement of Yen in millions income For the year ended March 31 location 2014 2015 2016 Foreign exchange forward contracts Foreign exchange gain (loss), net ¥ ¥ ) ¥ Currency option contracts Foreign exchange gain (loss), net ) — Currency swap contracts Other, net — — ) Interest Income — —

Fair value

Fair value	12 Months Ended
	Mar. 31, 2016
Fair Value
Fair Value	19. Fair Value: Under Statement of ASC 820, “Fair Value Measurements and Disclosures”, fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820 also establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs that reflect the assumptions market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect NIDEC’s assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy is broken down into three levels. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs (other than quoted prices) that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means. Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Assets and liabilities that are measured at Fair Value on a Recurring Basis: The following tables provide information by level for assets and liabilities that are measured at fair value, as defined by ASC 820, on a recurring basis. Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2015 Level 1 Level 2 Level 3 Assets: Marketable securities ¥ ¥ — Derivatives — Total assets: ¥ ¥ ¥ — Liabilities: Derivatives ¥ ¥ ¥ — Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2016 Level 1 Level 2 Level 3 Assets: Marketable securities ¥ ¥ ¥ — Derivatives — Total assets: ¥ ¥ ¥ — Liabilities: Derivatives ¥ ¥ ¥ — Level 1 securities and derivatives including commodity futures are valued using an unadjusted quoted market price in active markets with sufficient volume and frequency of transactions. Level 2 securities are valued using non-active market prices for identical assets. Level 2 derivatives including foreign exchange contracts are valued using quotes obtained from counterparties or third parties, which are periodically validated by pricing models using observable market inputs, such as foreign currency exchange rates, and interest rates. Fair value of financial instruments: The carrying amount and estimated fair values of NIDEC’s financial instruments, excluding those disclosed elsewhere, are summarized as follows: Yen in millions Yen in millions March 31, 2015 March 31, 2016 Carrying amount Estimated fair value Carrying amount Estimated Fair value Asset (Liability): Cash and cash equivalents ¥ ¥ ¥ ¥ Short-term investments Long-term investments Short-term loan receivable Long-term loan receivable Short-term borrowings ) ) ) ) Long-term debt including the current portion and excluding capital lease obligation and bonds ) ) ) ) Bonds including the current portion ¥ ) ¥ ) ¥ ) ¥ ) The following are explanatory notes relating to the financial instruments. Cash and cash equivalents, short-term investments, short-term loans receivable and short-term borrowings: In the normal course of business, substantially all cash and cash equivalents, short-term investments (time deposits), short-term loans receivable and short-term borrowings are highly liquid and are carried at amounts that approximate fair value. Long-term investments: NIDEC’s long-term investments are time deposits which are due over one year from the year ended March 31, 2016 to original maturity and are classified as Level 2 instruments. The fair value of long-term investments was estimated by discounting expected future cash flows. Long-term loan receivable: NIDEC’s long-term loan receivable instruments are classified as Level 2 instruments. The fair value of long-term loans was estimated by discounting expected future cash flows. Long-term debt: NIDEC’s long-term debt instruments are classified as Level 2 instruments. The fair value of long-term bank loans (including the current portion and excluding the capital lease obligation and bonds) was estimated based on the discounted amounts of future cash flows using NIDEC’s current incremental borrowing rates for similar liabilities. Bonds: NIDEC’s bonds instruments are classified as Level 2 instruments. The fair value of bonds issued by NIDEC was estimated based on the quoted market price for NIDEC bond instruments in markets that are not active. The carrying amounts of “Trade notes and accounts receivable” and “Trade notes and accounts payable” approximate fair value because of the short maturity of these instruments. The table described above excludes these financial instruments.

Related party transactions

Related party transactions	12 Months Ended
	Mar. 31, 2016
Related party transactions
Related party transactions	20. Related party transactions: As of March 31, 2016, the Chief Executive Officer (“CEO”) of the Company, a business entity indirectly owned by the CEO (“the business entity”), a foundation which president is the CEO and the CEO’s immediate family member held 8.3 %, 3.7 %, 0.3% and 1.8 % of the outstanding shares of the Company, respectively. In October 2013, the Company entered into a share exchange transaction with NCPL to make NCPL a wholly owned subsidiary of the Company. The Company allocated 4,856,764 shares of the Company’s common stock held in treasury into shareholders of NCPL except for the Company. The CEO was allocated 589,992 shares of the Company’s common stock held in treasury in exchange for shares of NCPL which the CEO had owned. This related party transaction with the CEO was at arm’s-length. This related party transaction did not have a material impact on NIDEC’s consolidated financial position, results of operations and liquidity. In October 2013, the Company entered into a share exchange transaction with NTSC to make NTSC a wholly owned subsidiary of the Company. The Company allocated 2,624,000 shares of the Company’s common stock held in treasury into shareholders of NTSC except for the Company. The CEO and the business entity were allocated 322,400 shares and 49,600 shares of the Company’s common stock, respectively, held in treasury in exchange for shares of NTSC which the CEO and the business entity had owned. These related party transactions with the CEO and the business entity was at arm’s-length. These related party transactions did not have a material impact on NIDEC’s consolidated financial position, results of operations and liquidity. In October 2014, the Company entered into a share exchange transaction with NCEL to make NCEL a wholly owned subsidiary of the Company. The Company allocated 3,160,575 shares of the Company’s common stock held in treasury into shareholders of NCEL except for the Company. The CEO was allocated 282,624 shares of the Company’s common stock held in treasury in exchange for shares of NCEL which the CEO had owned. This related party transaction with the CEO was at arm’s-length. This related party transaction did not have a material impact on NIDEC’s consolidated financial position, results of operations and liquidity. In October 2014, the Company entered into a share exchange transaction with NRCJ to make NRCJ a wholly owned subsidiary of the Company. The Company allocated 1,421,498 shares of the Company’s common stock held in treasury into shareholders of NRCJ except for the Company. The CEO and the business entity were allocated 182,250 shares and 51,030 shares of the Company’s common stock, respectively, held in treasury in exchange for shares of NRCJ which the CEO and the business entity had owned. These related party transactions with the CEO and the business entity was at arm’s-length. These related party transactions did not have a material impact on NIDEC’s consolidated financial position, results of operations and liquidity.

Lease commitments

Lease commitments	12 Months Ended
	Mar. 31, 2016
Lease commitments
Lease commitments	21. Lease commitments: NIDEC leases certain assets under capital lease and operating lease arrangements. An analysis of leased assets under capital leases is as follows: Yen in millions March 31 Class of property 2015 2016 Machinery and equipment ¥ ¥ Other leased assets Less — Accumulated amortization ) ) ¥ ¥ Amortization expenses under capital leases for the years ended March 31, 2014, 2015 and 2016 were ¥1,305 million, ¥1,109 million and ¥ 5,970 million, respectively. The future minimum lease payments under capital leases together with the present value of the net minimum lease payments as of March 31, 2016 are as follows: Yen in Millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum lease payments Less — Amount representing interest ) Present value of net minimum lease payments Less — Current obligations ) Long-term capital lease obligations ¥ Rental expenses under operating leases for the years ended March 31, 2014, 2015 and 2016 were ¥2,586 million, ¥2,911 million and ¥ 2,882 million, respectively. The minimum rental payments required under operating leases relating primarily to land, buildings and equipment having initial or remaining non-cancelable lease terms in excess of one year as of March 31, 2016 are as follows: Yen in millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum future rentals ¥ NIDEC is a lessor in direct financing leases and operating leases for which a portion of the land, office and manufacturing facilities is subleased over various terms. The direct financing leases did not have a material impact on our consolidated financial position or results of operations. Rental revenues under operating leases for the years ended March 31, 2014, 2015 and 2016 were ¥175 million, ¥39 million and ¥ 151 million, respectively. The future minimum lease payments to be received under operating leases that have remaining non-cancelable terms as of March 31, 2016 are as follows: Yen in millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum future rentals ¥

Other commitments and contingen

Other commitments and contingencies, concentrations and factors that may affect future operations	12 Months Ended
	Mar. 31, 2016
Other commitments and contingencies, concentrations and factors that may affect future operations
Other commitments and contingencies, concentrations and factors that may affect future operations	22. Other commitments and contingencies, concentrations and factors that may affect future operations: Commitments - Commitments outstanding at March 31, 2016 for the purchase of property, plant and equipment and other assets approximated ¥6,101 million. Contingencies - NIDEC has guaranteed approximately ¥256 million of lease contracts for customers in connection with the purchase for NIDEC’s products at March 31, 2016. No material claims have been made against guarantees, and based on our past experience and current expectations, NIDEC does not anticipate any material claims. NIDEC is contingently liable under bid bonds, advance payment bonds, performance bonds, warranty bonds and payment bonds, totaling ¥9,894 million as of March 31, 2016, primarily for guarantees of our performance on projects currently in execution or under warranty. No material claims have been made against guarantees, and based on our past experience and current expectations, NIDEC does not anticipate any material claims. Product warranty – NIDEC guarantees the performance of products delivered and services rendered for a certain period or term. Estimates for warranty cost are made based on historical warranty claim experience. The changes in product warranty liability for the years ended March 31, 2015 and 2016 are summarized as follows: Yen in millions March 31 2015 2016 Balance at beginning of year ¥ ¥ Addition Utilization ) ) Foreign exchange impact ) Balance at end of year ¥ ¥

Segment information

Segment information	12 Months Ended
	Mar. 31, 2016
Segment information
Segment information	23. Segment information: (1) Enterprise-wide information: Product information – The following table provides product information for the years ended March 31, 2014, 2015 and 2016: Yen in millions For the year ended March 31 2014 2015 2016 Net sales: Small precision motors: Hard disk drives spindle motors ¥ ¥ ¥ Other small precision motors Sub-total Automotive, appliance, commercial and industrial products Machinery Electronic and optical components Others Consolidated total ¥ ¥ ¥ The “Small precision motors” group of products consists of “Hard disk drives spindle motors” and “Other small precision motors”. The “Other small precision motors” group of products consists of brushless motors, fan motors, vibration motors, brush motors and motor applications, etc. The “Automotive, appliance, commercial and industrial products” group of products consists of automotive motors and components, home appliance, commercial and industrial motors and related products. The “Machinery” group of products consists of industrial robots, card readers, test systems, pressing machines and power transmission drives, etc. The “Electronic and optical components” group of products consists of switches, trimmer potentiometers, lens units and camera shutters, etc. “Others” consists of services, etc. Geographic information – Revenues from external customers, which are attributed to countries based on the location of the Company or the subsidiaries that transacted with the external customer for the years ended March 31, 2014, 2015 and 2016, and long-lived assets as of March 31, 2015 and 2016 are as follows: Yen in millions For the year ended March 31 2014 2015 2016 Net sales: Japan ¥ ¥ ¥ U.S.A. Singapore Thailand Germany China Other Consolidated total ¥ ¥ ¥ For the year ended March 31, 2016, the sales by the Germany segment are separated from the Others segment as an individual segment whilst the sales by the Philippines segment are combined into the Others segment. Accordingly, previous period amounts have been reclassified. Yen in millions March 31 2015 2016 Long-lived assets: Japan ¥ ¥ U.S.A. Singapore Thailand Germany China Other Consolidated total ¥ ¥ For the year ended March 31, 2016, the long-lived assets by the Germany segment are separated from the Others segment as an individual segment whilst the long-lived assets by the Philippines segment are combined into the Others segment. Accordingly, previous period amounts have been reclassified. (2) Operating segment information: The operating segments reported below are defined as components of an enterprise for which separate financial information is available and regularly reviewed by NIDEC’s chief operating decision maker. NIDEC’s chief operating decision maker utilizes various measurements to assess segment performance and allocate resources to segments. NIDEC has changed NIDEC’s segment reporting so that it is in line with recent acquisition activity and changes in materiality. The Nidec GPM group which was newly consolidated since February 2015 has been included in the Nidec Motors & Actuators segment. Since April 2015, the Nidec Philippines segment , the Nidec (Zhejiang) segment and the Nidec Copal Electronics segment are no longer identified as reportable segments and included in All Others segment due to their immateriality. All prior period segment information has been reclassified in accordance with the current period presentation to enable comparisons between the relevant amounts for the years ended March 31, 2014, 2015 and 2016. The Nidec Corporation segment comprises Nidec Corporation in Japan, which primarily develops and sells hard disk drives spindle motors, other small precision motors and automotive products. The Nidec Electronics (Thailand) segment comprises Nidec Electronics (Thailand) Co., Ltd., a subsidiary in Thailand, and its consolidated subsidiaries, which primarily produce and sell hard disk drives spindle motors. This segment also includes other subsidiaries in Asia which produce components for hard disk drives. The Nidec Singapore segment comprises Nidec Singapore Pte. Ltd., a subsidiary in Singapore, and its consolidated subsidiary, which primarily sell hard disk drives spindle motors and other small precision motors. The Nidec (H.K.) segment comprises Nidec (H.K.) Co., Ltd., a subsidiary in Hong Kong, and its consolidated subsidiaries, which primarily sell hard disk drives spindle motors and other small precision motors. The Nidec Sankyo segment comprises Nidec Sankyo Corporation, a subsidiary in Japan, and its consolidated subsidiaries, which primarily produce and sell machinery, automotive products, electronic parts and other small precision motors. The Nidec Copal segment comprises Nidec Copal Corporation, a subsidiary in Japan, and its consolidated subsidiaries, which primarily produce and sell optical and electronic parts, machinery and other small precision motors. The Nidec Techno Motor segment comprises Nidec Techno Motor Corporation, a subsidiary in Japan, and its consolidated subsidiaries, which primarily produce and sell commercial and industrial products. The Nidec Motor segment comprises Nidec Motor Corporation and other subsidiaries in North America, which are subsidiaries of Nidec Americas Holding Corporation, an intermediate holding company in the United States, as well as other subsidiaries in Latin America, Asia and Europe, which primarily produce and sell home appliance, commercial and industrial products. The Nidec Motors & Actuators segment comprises Nidec Motors & Actuators (Germany) GmbH in Germany and other subsidiaries in Europe, North America, Latin America, Japan and Asia, which primarily produce and sell automotive products. This segment also includes the Nidec GPM group which was newly consolidated since February 2015. The All Others segment comprises subsidiaries that are operating segments but not designated as reportable segments due to their immateriality. NIDEC evaluates performance based on segmental operating income or loss, which consists of sales and operating revenues less operating expenses. All segmental operating income or loss is accounted for under Japanese GAAP, except for Nidec Electronics (Thailand), Nidec Singapore, Nidec (H.K), Nidec Motor and Nidec Motors & Actuators. Therefore, NIDEC’s segmental data has not been prepared under U.S. GAAP on a basis that is consistent with NIDEC’s consolidated financial statements or on any other single basis that is consistent between segments. There are several differences between U.S. GAAP and the underlying accounting bases used by management. The principal differences that affect segmental operating income or loss include accounting for pension and severance costs, and leases. NIDEC’s segmental operating income or loss is presented in accordance with financial reporting principles and practices generally accepted in Japan. Management believes that monthly segmental information is available on a timely basis and that it is sufficiently accurate at the segment income or loss level for management’s purposes. The following tables show net sales to external customers and other financial information by operating segment for the years ended March 31, 2014, 2015 and 2016: Yen in millions For the year ended March 31 2014 2015 2016 Net sales to external customers: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Adjustments *1 ) ) Consolidated total ¥ ¥ ¥ *1 Adjustments primarily relate to the difference between recognition of revenue at the time of shipment and at the time of customer receipt. There was no certain customer group which exceeded 10% of the consolidated net sales for the years ended March 31, 2014, 2015 and 2016. Yen in millions For the year ended March 31 2014 2015 2016 Net sales to other operating segments: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Intersegment elimination ) ) ) Consolidated total — — — Yen in millions For the year ended March 31 2014 2015 2016 Operating income (loss): Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal ) Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Reclassification *1 U.S. GAAP adjustments and Others *2 ) ) ) Consolidation adjustments mainly related to elimination of intersegment income or loss Corporate*3 ) ) ) ¥ ¥ ¥ *1 Some items are reclassified from other expenses (income) and included in operating expenses (income). Main reclassification is income or loss from sales or disposals of fixed assets for the years ended March 31, 2014, 2015 and 2016. *2 Others is mainly from the amortization of identifiable intangible assets related to business combinations for the years ended March 31, 2014, 2015 and 2016 . *3 Corporate includes basic research expenses and head office expenses. Yen in millions For the year ended March 31 2014 2015 2016 Depreciation: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total U.S. GAAP adjustments*1, Corporate, and Others*2 ) ) ) Consolidated total ¥ ¥ ¥ *1 Some l eased assets are not capitalized in the operating segments but are capitalized under U.S. GAAP. *2 The amount of each segment includes amortization of intangible assets. Others mainly represent adjustments to exclude the amortization of intangible assets in order to reconcile amounts to consolidated total of depreciation in consolidated statements of cash flows. Yen in millions March 31 2015 2016 Segment assets: Nidec Corporation ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Elimination of intersegment assets and corporate, net of taxes*1 ) ) Identifiable intangible assets and other fair value adjustments Goodwill U.S.GAAP adjustments and Others *2 ) ) Consolidated total ¥ ¥ *1 Elimination of intersegment assets and corporate, net of taxes include corporate assets, which do not belong to any operating segment, of ¥ 171,462 million and ¥ 196,144 million as of March 31, 2015 and 2016, respectively. The depreciation related with the corporate assets is allocated to each operating segment in accordance with the rational allocation method. *2 Others is mainly due to the reclassification of deferred tax assets and liabilities on consolidation. Yen in millions For the year ended March 31 2015 2016 Capital expenditure for segment assets: Nidec Corporation ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Corporate Consolidated total ¥ ¥ NIDEC did not have significant non-cash items other than depreciation in reported profit. Intersegment sales were made at prices that approximate current market value.

Subsequent events

Subsequent events	12 Months Ended
	Mar. 31, 2016
Subsequent events
Subsequent events	24. Subsequent events: Dividends for the fiscal year ended March 31, 2016 Subsequent to March 31, 2016, the Company’s Board of Directors declared a cash dividend of ¥11,864 million payable on June 2, 2016 to stockholders as of March 31, 2016. Completion of Acquisition of ANA IMEP S.A. On May 31, 2016, Nidec Sole Motor Corporation S.R.L., NIDEC’s subsidiary, acquired approximately 94.8% of the shares of ANA IMEP S.A. (“IMEP”) in Romania from its major shareholder (the “Transaction”). 1) Purpose of the Transaction IMEP develops, manufactures and sells products of washing machine and drying machine motors. Through the Transaction, NIDEC expects to enhance the competitiveness of its appliance motor business in the European market, one of Appliance, Commercial and Industrial Motors business (“ACIM”) on which it particularly places emphasis. NIDEC also expects to obtain IMEP’s major customers. In addition, NIDEC intends to build up a major manufacturing base in an emerging EU market for its ACIM. 2) Funds NIDEC utilizes its cash on hand for funding.

Summary of significant accoun32

Summary of significant accounting policies (Policies)	12 Months Ended
	Mar. 31, 2016
Summary of significant accounting policies
Estimates	Estimates - The preparation of NIDEC’s consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Some of the more significant estimates include the valuation of inventories, allowance for doubtful accounts, depreciation and amortization of long-lived assets, valuation allowance for deferred tax assets, valuation of investment securities, fair value of financial instruments, uncertain tax positions, pension liabilities, the recoverability of long-lived assets and goodwill, and fair value of assets acquired and liabilities assumed. Actual results could differ from those estimates.
Basis of consolidation and accounting for investments in affiliated companies	Basis of consolidation and accounting for investments in affiliated companies - The consolidated financial statements include the accounts of the Company and those of its majority-owned subsidiary companies. All significant intercompany transactions and accounts have been eliminated. Companies over which NIDEC exercises significant influence, but which it does not control, are classified as affiliated companies and accounted for using the equity method. Consolidated net income includes NIDEC’s equity in current earnings (losses) of such companies, after elimination of unrealized intercompany profits. On occasion, NIDEC may acquire additional shares of the voting rights of a consolidated subsidiary or dispose of a part of those shares or a Nidec consolidated subsidiary may issue its shares to third parties. With respect to such transactions, all transactions for changes in a parent’s ownership interest in a subsidiary that do not result in the subsidiary ceasing to be a subsidiary are recognized as equity transactions.
Translation of foreign currencies	Translation of foreign currencies - Non monetary asset and liability accounts of foreign subsidiaries and affiliates are translated into Japanese yen at the year-end exchange rates and all income and expense accounts are translated at exchange rates that approximate those prevailing at the time of the transactions. The resulting translation adjustments are included as a component of accumulated other comprehensive income in shareholders’ equity. Monetary assets and liabilities denominated in foreign currencies are translated at the year-end exchange rates and the resulting transaction gains or losses are taken into income.
Cash and cash equivalents	Cash and cash equivalents - Cash and cash equivalents include all highly liquid investments, with original maturities of three months or less that are readily convertible to known amounts of cash and are so near maturity that they present insignificant risk of changes in value because of changes in interest rates. NIDEC participate in a notional pooling arrangement with a single financial institution, which is used to fund short-term liquidity needs. This arrangement contains specific provisions for the right to offset positive and negative cash balances. The facility allows for cash withdrawals from this financial institution based upon our aggregate cash deposits within the same financial institution. Our audited consolidated financial statements reflect cash net of withdrawals of ¥3,831 million as of March 31, 2016.
Inventories	Inventories - Inventories are stated at the lower of cost or market. Cost is determined principally on the weighted average cost basis. Cost includes the cost of materials, labor and applied factory overhead. Projects in progress, which mainly relate to production of factory automation equipment based on contracts with customers, are stated at the lower of cost or market, cost being determined as the accumulated production cost.
Marketable securities	Marketable securities - Marketable securities consist of equity securities that are listed on recognized stock exchanges and debt securities. Equity securities designated as available-for-sale are carried at fair value with changes in unrealized gains or losses included as a component of accumulated other comprehensive income in shareholders’ equity, net of applicable taxes. Realized gains and losses are determined on the average cost method and are reflected in the statement of income. Other than temporary declines in market value of individual securities classified as available-for-sale are charged to income in the period the loss occurs. Debt securities designated as held-to-maturity securities are recorded at amortized cost, adjusted for the amortization or accretion of premiums or discounts.
Derivative financial instruments	Derivative financial instruments - NIDEC manages the exposures of fluctuations in foreign exchange rate, interest rate and commodity prices through the use of derivative financial instruments which include foreign exchange forward contracts, interest rate swap agreements, currency swap agreements and commodity future contracts. NIDEC does not hold derivative financial instruments for trading purposes. Derivatives are accounted for under ASC 815, “Derivatives and Hedging.” All derivatives are recorded as either assets or liabilities on the balance sheet and measured at fair value. Changes in the fair value of derivatives are charged in current earnings. However certain derivatives may qualify for hedge accounting as a cash flow hedge, if the hedging relationship is expected to be highly effective in achieving offsetting of cash flows of the hedging instruments and hedged items. Under hedge accounting, changes in the fair value of the effective portion of these derivatives designated as cash flow hedge derivatives are deferred in accumulated other comprehensive income and charged to earnings when the underlying transaction being hedged occurs. NIDEC designates certain foreign exchange forward contracts, interest rate swap agreements and commodity future contracts as cash flow hedges. NIDEC formally documents all relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking various hedge transactions. This process includes linking all derivatives designated as cash flow hedges to specific assets and liabilities on the balance sheet or forecasted transactions. NIDEC also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives that are used in hedging transactions are highly effective in offsetting cash flows of hedged items. When it is determined that a derivative is not a highly effective hedge or that it has ceased to be a highly effective hedge, NIDEC discontinues hedge accounting prospectively. When a cash flow hedge is discontinued, the previously recognized net derivative gains or losses remain in accumulated other comprehensive income until the hedged transaction occurs, unless it is probable that the forecasted transaction will not occur at which point the derivative gains or losses are reclassified into earnings immediately.
Property, plant and equipment	Property, plant and equipment - Property, plant and equipment are stated at cost. Major renewals and improvements are capitalized; minor replacements, maintenance and repairs are charged to expense in the year incurred. Depreciation of property, plant and equipment is computed on the straight-line method at rates based on the estimated useful lives of the assets. Estimated useful lives range from 7 to 47 years for factories to produce NIDEC’s products, 50 years for the head office and sales offices, from 3 to 18 years for leasehold improvements, and from 2 to 15 years for machinery and equipment. Depreciation expense amounted to ¥39,497 million, ¥45,087 million, and ¥ 55,298 million for the years ended March 31, 2014, 2015 and 2016, respectively.
Lease	Lease- NIDEC capitalizes leases and related obligations when any of the four criteria are met within the guidance of ASC 840 “Leases”. Under ASC840, these leases and related obligations are capitalized at the commencement of the lease at the lower of the fair value of the leased property and the present value of the minimum lease payments.
Goodwill and other intangible assets	Goodwill and other intangible assets - Goodwill and other intangible assets are accounted for under ASC350, “Intangibles - Goodwill and Other”. Goodwill acquired in business combinations is not amortized but tested annually for impairment. NIDEC tests for impairment at the reporting unit level on January 1st of each year. In addition, NIDEC tests for impairment between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. This test is a two-step process. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of the reporting unit with its carrying amount, including goodwill. If the fair value, which is based on discounted future cash flows, exceeds the carrying amount, goodwill is not considered impaired. If the carrying amount exceeds the fair value, the second step must be performed to measure the amount of the impairment loss, if any. The second step compares the implied fair value of the reporting unit’s goodwill with the carrying amount of that goodwill. Other intangible assets include proprietary technology and customer relationships, as well as software and other intangible assets acquired in business combinations. Intangible assets with an indefinite life are not subject to amortization and are tested for impairment once on January 1st of each year or more frequently if an event occurs or circumstances change. Intangible assets with a definite life are amortized on a straight-line basis over their estimated useful lives. The weighted average amortization period for proprietary technology, customer relationships and software are 12 years, 18 years and 6 years, respectively.
Long-lived assets	Long-lived assets - NIDEC reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset group may not be recoverable. An impairment loss would be recognized when the carrying amount of an asset group exceeds the estimated undiscounted future cash flows expected to result from the use of the asset group and its eventual disposition. The amount of the impairment loss to be recorded is calculated as the excess of the assets group’s carrying value over its fair value. Long-lived assets that are to be disposed of other than by sale are considered to be held and used until the disposal. Long-lived assets that are to be disposed of by sale are reported at the lower of their carrying value or fair value less costs to sell. Reductions in carrying value are recognized in the period in which long-lived assets are classified as held for sale.
Revenue recognition	Revenue recognition - NIDEC recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable and collectibility is reasonably assured. For small precision motors, automotive, appliance, commercial and industrial products and electronic and optical components, these criteria are generally met at the time a product is delivered to the customers’ site which is the time the customer has taken title to the product and the risk and rewards of ownership have been substantively transferred. These conditions are met at the time of delivery to customers in domestic sales (FOB destination) and at the time of shipment for export sales (FOB shipping point). Revenue for machinery sales is recognized upon receipt of final customer acceptance. At the time the related revenue is recognized, NIDEC makes provisions for estimated product returns. Revenue from a part of sales of automotive, appliance, commercial and industrial products under long-term construction type arrangements are recognized under the percentage-of-completion method. Under the percentage-of-completion method, revenue is recognized as a percentage of estimated total revenue that incurred costs to date bear to estimated total costs after giving effect to estimates of costs to complete based upon the most recent information.
Research and development expenses	Research and development expenses- Research and development expenses, mainly consisting of personnel and depreciation expenses at research and development branches, are charged to operations as incurred.
Advertising costs	Advertising costs - Advertising and sales promotion costs are expensed as incurred. Advertising costs were ¥477 million, ¥525 million, and ¥ 684 million for the years ended March 31, 2014, 2015 and 2016, respectively.
Income taxes	Income taxes - The provision for income taxes is computed based on the pretax income included in the consolidated statement of income. The asset and liability approach is used to recognize deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. Valuation allowances are recorded to reduce deferred tax assets when it is more likely than not that a tax benefit will not be realized. NIDEC recognizes the financial statement effects of tax positions when it is more likely than not, based on the technical merits, that the tax positions will be sustained upon examination by the tax authorities. Benefits from tax positions that meet the more-likely-than-not recognition threshold are measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement. Interest and penalties accrued related to unrecognized tax benefits are included in other, net in the consolidated statements of income.
Earnings per share	Earnings per share - Basic net income per common share is calculated by dividing net income by the weighted-average number of shares outstanding during the reported period. The calculation of diluted net income per common share is similar to the calculation of basic net income per share, except that the weighted-average number of shares outstanding includes the additional dilution from potential common stock equivalents such as convertible bonds and options.
Reclassification	Reclassification Certain reclassifications of previously reported amounts have been made to the consolidated financial statements and footnotes for the years ended March 31, 2014 and 2015 to conform to the current year presentation.
Accounting Changes and Recent Accounting Pronouncements	Accounting Changes As of April 1, 2015, NIDEC adopted FASB Accounting Standards Codification™ (ASC) 205 “Presentation of Financial Statements” and ASC 360 “Property, Plant, and Equipment” updated by Accounting Standards Update (ASU) No. 2014-08 “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”. ASU 2014-08 requires that a disposal of a component or a group of components of an entity should be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results when the component meets the criteria to be classified as held for sale or is disposed. ASU 2014-08 also requires additional disclosures about discontinued operations and disposal of an individually significant component of an entity that does not qualify for discontinued operations. The adoption of this standard did not have any impact on NIDEC’s consolidated financial position, results of operations or liquidity. Recent Accounting Pronouncements Nidec decided to voluntarily adopt International Financial Reporting Standards (“IFRS”) to its consolidated financial statements in lieu of the current US-GAAP to strengthen and improve the efficiency of financial reporting. Nidec is due to disclose its consolidated financial statements according to IFRS from the first quarter of the fiscal year ending March 2017.Therefore, Nidec will not present the recent U.S. GAAP accounting pronouncements that have not been effective yet as Nidec will not apply them. Nidec is currently evaluating the potential impact from adopting IFRS on its consolidated financial position, results of operations and liquidity.

Acquisitions and dispositions (

Acquisitions and dispositions (Tables)	12 Months Ended
	Mar. 31, 2016
Gerte- und Pumpenbau GmbH Dr. Eugen Schmidt ("GPM")
Acquisitions and dispositions
Unaudited Pro Forma Results of Operations	Yen in millions For the year ended March 31 (Unaudited) 2014 2015 Pro forma net sales ¥ ¥ Pro forma net income Yen Pro forma n et income a ttributable to Nidec Corporation per share — Basic ¥ ¥ — Diluted

Goodwill and other intangible34

Goodwill and other intangible assets (Tables)	12 Months Ended
	Mar. 31, 2016
Goodwill and other intangible assets
Schedule of Finite-Lived Intangible Assets by Major Class	Yen in millions March 31 2015 2016 Gross carrying amounts Accumulated amortization Carrying amounts Gross carrying amounts Accumulated amortization Carrying amounts Proprietary technology ¥ ¥ ¥ ¥ ¥ ¥ Customer relationships Software Other Total ¥ ¥ ¥ ¥ ¥ ¥
Schedule of Expected Amortization Expense	Years ending March 31, Yen in millions 2017 ¥ 2018 2019 2020 2021
Goodwill Allocated to Operating Segment	Yen in millions Balance as of April 1, 2014 Acquisition Impairment loss Translation adjustments and Others Balance as of March 31, 2015 Goodwill: Nidec Electronics (Thailand) ¥ ¥ — ¥ — ¥ ¥ Nidec Sankyo — — Nidec Copal — — — Nidec Techno Motor — — — Nidec Motor — — Nidec Motors & Actuators — All Others — — ¥ ¥ ¥ — ¥ ¥ Yen in millions Balance as of April 1, 2015 Acquisition Impairment loss Translation adjustments and Others Balance as of March 31, 2016 Goodwill: Nidec Electronics (Thailand) ¥ ¥ — ¥ — ¥ ¥ Nidec Sankyo — ) Nidec Copal — — — Nidec Techno Motor — — — Nidec Motor — ) Nidec Motors & Actuators — — ) All Others — ) ¥ ¥ ¥ — ¥ ) ¥

Supplemental cash flow inform35

Supplemental cash flow information (Tables)	12 Months Ended
	Mar. 31, 2016
Supplemental cash flow information
Schedule of Cash Flow, Supplemental Disclosures	Yen in millions For the year ended March 31 2014 2015 2016 Cash paid during the fiscal year for: Income taxes ¥ ¥ ¥ Interest Non-cash investing and financing activities: Capital lease obligations Conversion of convertible bond — Change in ownership of subsidiaries in connection with share exchange transaction —Change in common stock — —Change in treasury stock —

Allowance for doubtful accoun36

Allowance for doubtful accounts (Tables)	12 Months Ended
	Mar. 31, 2016
Allowance for doubtful accounts
Schedule of Allowance for Doubtful Account Activity	Yen in millions 2014 2015 2016 Allowance for doubtful accounts at beginning of the year ¥ ¥ ¥ Provision for doubtful accounts, net of reversal ) Write-offs ) ) ) Translation adjustment and other ) Allowance for doubtful accounts at the end of the year ¥ ¥ ¥

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Mar. 31, 2016
Inventories
Schedule of Inventory, Current	Yen in millions March 31 2015 2016 Finished goods ¥ ¥ Raw materials Work in process Supplies and other ¥ ¥

Other current assets (Tables)

Other current assets (Tables)	12 Months Ended
	Mar. 31, 2016
Other current assets
Schedule of Other Current Assets	Yen in millions March 31 2015 2016 Other receivable ¥ ¥ Deferred tax assets (Note 16) Costs on uncompleted construction contracts Prepaid expenses Other ¥ ¥

Marketable securities and oth39

Marketable securities and other securities investments (Tables)	12 Months Ended
	Mar. 31, 2016
Marketable securities and other securities investments
Investments in Debt and Marketable Equity Securities and Certain Trading Assets Disclosure	Yen in millions March 31, 2015 Cost Gross unrealized gains Gross unrealized losses Fair value Available-for-sale Equity securities ¥ ¥ ¥ — ¥ Debt securities — — Held-to-maturity Japanese government debt securities — ¥ ¥ ¥ — ¥ Securities not practicable to estimate fair value Equity securities ¥ Yen in millions March 31, 2016 Cost Gross unrealized gains Gross unrealized losses Fair value Available-for-sale Equity securities ¥ ¥ ¥ ¥ Debt securities — — Held-to-maturity Japanese government debt securities — ¥ ¥ ¥ ¥ Securities not practicable to estimate fair value Equity securities ¥
Unrealized Loss Position Investments	Yen in millions March 31, 2015 Less than 12 months 12 months or more Fair value Unrealized loss Fair value Unrealized loss Equity securities ¥ — ¥ — ¥ — ¥ — Debt securities — — — — ¥ — ¥ — ¥ — ¥ — Yen in millions March 31, 2016 Less than 12 months 12 months or more Fair value Unrealized loss Fair value Unrealized loss Equity securities ¥ ¥ ¥ — ¥ — Debt securities — — — — ¥ ¥ ¥ — ¥ —

Other non-current assets (Table

Other non-current assets (Tables)	12 Months Ended
	Mar. 31, 2016
Other non-current assets
Schedule of other non-current assets	Yen in millions March 31 2015 2016 Intangible assets *1 ¥ ¥ Other *2 ¥ ¥ Notes: *1 “Intangible assets” information is described in Note 4 “Goodwill and other intangible assets”. *2 “Other” primarily consists of long-term prepaid expenses.

Short-term borrowings and lon41

Short-term borrowings and long-term debt (Tables)	12 Months Ended
	Mar. 31, 2016
Short-term borrowings and long-term debt
Schedule of Short-term Borrowings	Yen in millions March 31 2015 2016 Unsecured loans, principally from banks with average interest at March 31, 2015 and 2016 of 0.17% and 0.23% per annum, respectively ¥ ¥ Secured loans, principally from banks with average interest at March 31, 2016 of 5.98% per annum — ¥ ¥
Schedule of Long-term Debt Instruments	Yen in millions March 31 2015 2016 Unsecured loans, representing obligations principally to banks Due 2015 to 2026 in 2015 with interest ranging from 0.17% to 6.40% per annum in 2015 ¥ — Due 2016 to 2026 in 2016 with interest ranging from 0.00% to 14.79% per annum in 2016 — ¥ Secured loans, representing obligations principally to banks Due 2015 to 2024 in 2015 with interest ranging from 1.45% to 3.50% per annum in 2015 — Due 2016 to 2023 in 2016 with interest ranging from 1.95% to 3.50% per annum in 2016 — Zero coupon convertible bonds due 2015 Convertible at ¥5,313 for one common share — Unsecured straight bonds due 2017 Interest at 0.39% per annum in 2015 and 2016 Unsecured straight bonds due 2019 Interest at 0.60% per annum in 2015 and 2016 Unsecured straight bonds due 2022 Interest at 0.96% per annum in 2015 and 2016 Unsecured straight bonds due 2016 Interest at 0.21% per annum in 2015 and 2016 Capital lease obligations Due 2015 to 2020 in 2015, with interest ranging from 0.00% to 15.74 % per annum in 2015 — Due 2016 to 2023 in 2016, with interest ranging from 0.00% to 15.74 % per annum in 2016 — Less - Bonds current portion due within one year ) ) Less - Long-term debt current portion due within one year ) ) Less - Capital lease obligation current portion due within one year ) ) ¥ ¥
Schedule of Maturities of Long-term Debt	Yen in millions March 31 2015 2016 Principal amount ¥ ¥ — Unamortized premium — Total ¥ ¥ —
Yen Denominated zero coupon convertible bonds due 2015
Short-term borrowings and long-term debt
Schedule of Long-term Debt Instruments	Yen in millions Year ending March 31 2017 ¥ 2018 2019 2020 2021 2022 and thereafter ¥

Other current liabilities (Tabl

Other current liabilities (Tables)	12 Months Ended
	Mar. 31, 2016
Other current liabilities
Other Current Liabilities	Yen in millions March 31 2015 2016 Accounts payable for property, plant and equipment ¥ ¥ Advances received Income taxes payable Product warranty liabilities Other ¥ ¥

Pension and severance plans (Ta

Pension and severance plans (Tables)	12 Months Ended
	Mar. 31, 2016
Pension and severance plans
Schedule of Allocation of Plan Assets	Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2015 Level 1 Level 2 Level 3 Equity securities: Japanese companies ¥ ¥ ¥ — ¥ — Foreign companies — — Debt securities: Pooled funds *1 — — Other assets: Cash and cash equivalents — — Life insurance company general accounts — — Pooled funds *2 — — Others — — Total ¥ ¥ ¥ ¥ — *1 These funds invest in approximately 65 % Japanese bonds, 35 % foreign bonds. *2 These funds primarily invest in listed equity securities consisting of approximately 4 % Japanese companies and 28 % foreign companies, and debt security consisting of approximately 7 % Japanese bonds and 47 % foreign bonds. Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2016 Level 1 Level 2 Level 3 Equity securities: Japanese companies ¥ ¥ ¥ — ¥ — Foreign companies — — Debt securities: Pooled funds *1 — — Other assets: Cash and cash equivalents — — Life insurance company general accounts — — Pooled funds *2 — — Others — — Total ¥ ¥ ¥ ¥ — *1 These funds invest in approximately 65 % Japanese bonds, 35 % foreign bonds. *2 These funds primarily invest in listed equity securities consisting of approximately 9 % Japanese companies and 27 % foreign companies, and debt security consisting of approximately 8 % Japanese bonds and 46 % foreign bonds.
Schedule of Expected Benefit Payments	Yen in millions Japanese plans Foreign plans 2017 ¥ ¥ 2018 2019 2020 2021 Years 2022-2026 ¥ ¥
Japanese plans
Pension and severance plans
Schedule of Net Funded Status	Yen in millions March 31 2015 2016 Change in benefit obligation: Benefit obligation at beginning of year ¥17,666 ¥18,194 Service cost Interest cost Actuarial loss Plan amendment ) — Benefits paid ) ) Change in plan assets: Fair value of plan assets at beginning of year Actual return on plan assets Employer contribution Benefits paid ) ) Fair value of plan assets at end of year Funded status ¥(3,265 ) ¥(4,323 )
Schedule of Amounts Recognized in Balance Sheet	Yen in millions March 31 2015 2016 Accrued pension and severance costs ¥ ¥ Other non-current assets ) ) Net amounts recognized ¥ ¥
Schedule of Net Periodic Benefit Cost Not yet Recognized	Yen in millions March 31 2015 2016 Actuarial loss ¥ ) ¥ Prior service credit Pension liability adjustments, pre-tax ¥ ) ¥
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	Yen in millions March 31 2015 2016 Projected benefit obligations ¥11,056 ¥11,233 Accumulated benefit obligations ¥10,763 ¥10,812 Fair value of plan assets ¥ ¥
Schedule of Net Benefit Costs	Yen in millions For the year ended March 31 2014 2015 2016 Components of net periodic (benefit) cost: Service cost ¥ ¥ ¥ Interest cost Expected return on plan assets ) ) ) Amortization of net actuarial loss Amortization of prior service credit ) ) ) Net periodic pension cost ¥ ¥ ¥
Japanese plans | Benefit Obligations
Pension and severance plans
Schedule of Assumptions Used	March 31 2015 2016 Discount rate % % Rate of compensation increase % %
Japanese plans | Net Periodic Benefit Cost
Pension and severance plans
Schedule of Assumptions Used	For the year ended March 31 2014 2015 2016 Discount rate % % % Expected return on plan assets % % % Rate of compensation increase % % %
Foreign plans
Pension and severance plans
Schedule of Net Funded Status	Yen in millions March 31 2015 2016 Change in benefit obligation: Benefit obligation at beginning of year ¥ ¥ Service cost Interest cost Actuarial gain(loss) ) Settlement — ) Acquisition and other ) ) Foreign currency exchange rate changes ) Benefits paid ) ) Change in plan assets: Fair value of plan assets at beginning of year Actual return on plan assets Employer contribution Settlement ) ) Foreign currency exchange rate changes and other ) Benefits paid ) ) Fair value of plan assets at end of year Funded status ¥ ) ¥ )
Schedule of Amounts Recognized in Balance Sheet	Yen in millions March 31 2015 2016 Accrued pension and severance costs ¥ ¥ Other non-current assets — ) Net amounts recognized ¥ ¥
Schedule of Net Periodic Benefit Cost Not yet Recognized	Yen in millions March 31 2015 2016 Actuarial gain(loss) ¥ ) ¥ ) Pension liability adjustments, pre-tax ¥ ) ¥ )
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets	Yen in millions March 31 2015 2016 Projected benefit obligations ¥27,045 ¥23,815 Accumulated benefit obligations Fair value of plan assets ¥ ¥
Schedule of Net Benefit Costs	Yen in millions For the year ended March 31 2014 2015 2016 Components of net periodic (benefit) cost: Service cost ¥ ¥ ¥ Interest cost Expected return on plan assets ) ) ) Amortization of net actuarial loss Net periodic pension cost ¥ ¥ ¥
Foreign plans | Benefit Obligations
Pension and severance plans
Schedule of Assumptions Used	March 31 2015 2016 Discount rate % % Rate of compensation increase % %
Foreign plans | Net Periodic Benefit Cost
Pension and severance plans
Schedule of Assumptions Used	For the year ended March 31 2014 2015 2016 Discount rate % % % Expected return on plan assets % % % Rate of compensation increase % % %

Other long-term liabilities (Ta

Other long-term liabilities (Tables)	12 Months Ended
	Mar. 31, 2016
Other long-term liabilities
Schedule of Other Long-term Liabilities	Yen in millions March 31 2015 2016 Deferred tax liabilities (Note 16) ¥ ¥ Other ¥ ¥

Equity (Tables)

Equity (Tables)	12 Months Ended
	Mar. 31, 2016
Equity
Changes in Accumulated Other Comprehensive Income (Loss) by Component	Yen in Millions Foreign currency translation adjustments Net unrealized gains (losses) from securities Net gains (losses) from derivative instruments Pension liability adjustments Total For the year ended March 31, 2015: Balance at March 31, 2014 ) ) Other comprehensive income (loss) before reclassifications ) ) Amounts reclassified from accumulated other comprehensive income (loss) ) ) ) ) Net change during the current period other comprehensive income (loss) ) ) Balance at March 31, 2015 ) ) Yen in Millions Foreign currency translation adjustments Net unrealized gains (losses) from securities Net gains (losses) from derivative instruments Pension liability adjustments Total For the year ended March 31, 2016: Balance at March 31, 2015 ) ) Other comprehensive income (loss) before reclassifications ) ) ) ) ) Amounts reclassified from accumulated other comprehensive income (loss) ) Net change during the current period other comprehensive income (loss) ) ) ) ) Balance at March 31, 2016 ) )
Reclassification Out of Accumulated Other Comprehensive Income (Loss)	Yen in Millions Amount Reclassified from Accumulated other comprehensive income (loss) *1 Affected line items in consolidated statement of income For the year ended March 31, 2015: Foreign currency translation adjustments ) Other, net, Selling,general and administrative expenses — Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net unrealized gains (losses) from securities ) Gain from marketable securities, net Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net gains (losses) from derivative instruments Cost of products sold, Interest expense ) Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Pension liability adjustments ) *2 Income taxes ) Consolidated net income Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Total amount reclassified, net of tax and noncontrolling interests ) *1 Amounts in parentheses indicate gains in consolidated statement of income. *2 This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost. Yen in Millions Amount Reclassified from Accumulated other comprehensive income (loss) *1 Affected line items in consolidated statement of income For the year ended March 31, 2016: Foreign currency translation adjustments Other, net, Selling,general and administrative expenses — Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Net unrealized gains (losses) from securities ) Gain from marketable securities, net Income taxes ) Consolidated net income — Net income attributable to noncontrolling interests ) Net income attributable to Nidec Corporation Net gains (losses) from derivative instruments Cost of products sold, Interest expense ) Income taxes Consolidated net income — Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Pension liability adjustments *2 ) Income taxes Consolidated net income ) Net income attributable to noncontrolling interests Net income attributable to Nidec Corporation Total amount reclassified, net of tax and noncontrolling interests *1 Amounts in parentheses indicate gains in consolidated statement of income. *2 This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost.
Schedule of Tax Effects Allocated and Reclassification Adjustments	Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2014: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ¥ — ¥ Reclassification adjustments for gains and losses realized in net income — — — Net unrealized gains (losses) from securities: Unrealized holding gains (losses) arising during period ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) ) Pension liability adjustment: Actuarial gains (losses) arising during period ) Prior service cost arising during period ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ¥ ) ¥ Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2015: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ¥ — ¥ Reclassification adjustments for gains and losses realized in net income ) — ) Net unrealized gains (losses) from securities: Unrealized holding gains (losses)arising during period ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) Pension liability adjustment: Actuarial gains (losses) arising during period ) ) Prior service cost arising during period ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ¥ ¥ Yen in millions Pre-tax amount Tax benefit/ (expense) Net-of-tax amount For the year ended March 31, 2016: Foreign currency translation adjustments: Foreign currency translation adjustments arising during period ¥ ) ¥ — ¥ ) Reclassification adjustments for gains and losses realized in net income — Net unrealized gains (losses) from securities: Unrealized holding gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) ) Net gains (losses) from derivative instruments qualifying for cash flow hedges: Unrealized gains (losses) arising during period ) ) Reclassification adjustments for gains and losses realized in net income ) Pension liability adjustment: Actuarial gains (losses) arising during period ) ) Reclassification adjustments for actuarial gains and losses realized in net income ) Reclassification adjustments for prior service credit and cost realized in net income ) ) Other comprehensive income (loss) ¥ ) ¥ ¥ )

Income taxes (Tables)

Income taxes (Tables)	12 Months Ended
	Mar. 31, 2016
Income taxes
Schedule of Income before Income Tax, Domestic and Foreign	Yen in millions For the year ended March 31 2014 2015 2016 Income (loss) before income taxes: The Company and domestic subsidiaries ¥ ¥ ¥ Foreign subsidiaries ¥ ¥ ¥
Schedule of Components of Income Tax Expense (Benefit)	Yen in millions For the year ended March 31 2014 2015 2016 Current income tax expense/(benefit): The Company and domestic subsidiaries ¥ ¥ ¥ Foreign subsidiaries Total current Deferred income tax expense (benefit): The Company and domestic subsidiaries Foreign subsidiaries Total deferred Total provision ¥ ¥ ¥
Schedule of Effective Income Tax Rate Reconciliation	For the year ended March 31 2014 2015 2016 Statutory tax rate % % % Increase (reduction) in taxes resulting from: Tax benefit in foreign subsidiaries ) ) ) Tax on undistributed earnings Valuation allowance ) ) ) Liabilities for unrecognized tax benefits ) Reversal of deferred tax assets related to foreign tax credit — — Deduction for foreign taxes Withholding tax on dividends from overseas subsidiaries Changes in Japanese income tax rates Other ) ) Effective income tax rate % % %
Summary of Income Tax Holiday	Yen in millions For the year ended March 31 2014 2015 2016 Aggregate amounts of tax holidays ¥ ¥ ¥ Yen Per share - Basic ¥ ¥ ¥ - Diluted ¥ ¥ ¥
Schedule of Deferred Tax Assets and Liabilities	Yen in millions March 31 2015 2016 Deferred tax assets: Inventories ¥ ¥ Property, plant and equipment Accrued bonus Accrued enterprise tax Pension and severance plans Operating loss carryforwards for tax purposes Accrued vacation Accrued expenses Other Gross deferred tax assets Less - Valuation allowance ) ) Net deferred tax assets Deferred tax liabilities: Basis difference of acquired assets ) ) Undistributed earnings not permanently reinvested ) ) Marketable securities ) ) Intangible assets ) ) Other ) ) Total deferred tax liabilities ) ) Net deferred tax liabilities ¥ ) ¥ )
Summary of Valuation Allowance	Yen in millions March 31 2014 2015 2016 Valuation allowance at beginning of year ¥ ) ¥ ) ¥ ) Additions ) ) ) Deductions Impact on newly acquired companies ) — — Valuation allowance at end of year ¥ ) ¥ ) ¥ )
Components of net deferred tax assets	Yen in millions March 31 2015 2016 Deferred tax assets: Other current assets ¥ ¥ Other non-current assets Deferred tax liabilities: Other current liabilities ) ) Other long-term liabilities ) ) Net deferred tax liabilities ¥ ) ¥ )
Reconciliation of the Beginning and Ending Amounts of Unrecognized Tax Benefits	Yen in millions For the year ended March 31, 2014 2015 2016 Balance at April 1 ¥ ¥ ¥ Additions for tax positions of the current year Reduction for tax positions of prior years ) — ) Impact on newly acquired companies — — Balance at March 31 ¥ ¥ ¥

Reconciliation of the differe47

Reconciliation of the differences between basic and diluted earnings per share (Tables)	12 Months Ended
	Mar. 31, 2016
Reconciliation of the differences between basic and diluted earnings per share
Schedule of Earnings Per Share Reconciliation	Yen in millions Thousands of shares Yen Net income attributable to Nidec Corporation Weighted- average shares Net income attributable to Nidec Corporation per share For the year ended March 31, 2014: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ For the year ended March 31, 2015: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Yen in millions Thousands of shares Yen Net income attributable to Nidec Corporation Weighted- average shares Net income attributable to Nidec Corporation per share For the year ended March 31, 2016: Basic net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥ Effect of dilutive securities: Zero coupon convertible bonds ) Diluted net income attributable to Nidec Corporation per share: Net income attributable to Nidec Corporation ¥ ¥

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Mar. 31, 2016
Derivatives
Schedule of Derivative Instruments	Derivatives designated as cash flow hedges are as follows: Yen in millions March 31, 2015 March 31, 2016 Foreign exchange forward contracts ¥ ¥ Interest rate swap agreements — Commodity futures Derivatives not designated as hedging instruments are as follows: Yen in millions March 31, 2015 March 31, 2016 Foreign exchange forward contracts ¥ ¥ Currency swap contracts —
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value	Derivatives designated as cash flow hedges are as follows: Asset Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current assets ¥ ¥ — Commodity futures Other current assets Liability Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current liabilities ¥ ¥ Interest rate swap agreements Other current liabilities — Commodity futures Other current liabilities Derivatives not designated as hedging instruments are as follows: Asset Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Currency swap contracts Other current assets — Liability Derivatives Yen in millions Balance sheet location March 31, 2015 March 31, 2016 Foreign exchange forward contracts Other current liabilities ¥ ¥ Currency swap contracts Other current liabilities —
Schedule of Derivative Instruments Gain Loss in Statement of Financial Performance	Derivatives designated as cash flow hedges are as follows: Gains (losses) recognized in accumulated other comprehensive income Yen in millions For the year ended March 31 2014 2015 2016 Foreign exchange forward contracts ¥ ) ¥ ) ¥ Interest rate swap agreements ) Commodity futures ) Gains (losses) reclassified from accumulated other comprehensive income into income (effective portion) Statement of Yen in millions income For the year ended March 31 location 2014 2015 2016 Foreign exchange forward contracts Cost of sales ¥ ¥ ¥ ) Interest rate swap agreements Interest expense ) ) ) Commodity futures Cost of sales ) ) ) Derivatives not designated as hedging instruments are as follows: Gains (losses) recognized in income Statement of Yen in millions income For the year ended March 31 location 2014 2015 2016 Foreign exchange forward contracts Foreign exchange gain (loss), net ¥ ¥ ) ¥ Currency option contracts Foreign exchange gain (loss), net ) — Currency swap contracts Other, net — — ) Interest Income — —

Fair value (Tables)

Fair value (Tables)	12 Months Ended
	Mar. 31, 2016
Fair Value
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2015 Level 1 Level 2 Level 3 Assets: Marketable securities ¥ ¥ — Derivatives — Total assets: ¥ ¥ ¥ — Liabilities: Derivatives ¥ ¥ ¥ — Yen in millions Fair Value at Fair Value Measurements Using Inputs Considered as March 31, 2016 Level 1 Level 2 Level 3 Assets: Marketable securities ¥ ¥ ¥ — Derivatives — Total assets: ¥ ¥ ¥ — Liabilities: Derivatives ¥ ¥ ¥ —
Fair Value, by Balance Sheet Grouping	Yen in millions Yen in millions March 31, 2015 March 31, 2016 Carrying amount Estimated fair value Carrying amount Estimated Fair value Asset (Liability): Cash and cash equivalents ¥ ¥ ¥ ¥ Short-term investments Long-term investments Short-term loan receivable Long-term loan receivable Short-term borrowings ) ) ) ) Long-term debt including the current portion and excluding capital lease obligation and bonds ) ) ) ) Bonds including the current portion ¥ ) ¥ ) ¥ ) ¥ )

Lease commitments (Tables)

Lease commitments (Tables)	12 Months Ended
	Mar. 31, 2016
Lease commitments
Schedule of Capital Leased Assets	Yen in millions March 31 Class of property 2015 2016 Machinery and equipment ¥ ¥ Other leased assets Less — Accumulated amortization ) ) ¥ ¥
Schedule of Future Minimum Lease Payments for Capital Leases	The future minimum lease payments under capital leases together with the present value of the net minimum lease payments as of March 31, 2016 are as follows: Yen in Millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum lease payments Less — Amount representing interest ) Present value of net minimum lease payments Less — Current obligations ) Long-term capital lease obligations ¥
Operating Leases of Lessee Disclosure	The minimum rental payments required under operating leases relating primarily to land, buildings and equipment having initial or remaining non-cancelable lease terms in excess of one year as of March 31, 2016 are as follows: Yen in millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum future rentals ¥
Schedule Of Future Minimum Rental Payments for Operating Leases	The future minimum lease payments to be received under operating leases that have remaining non-cancelable terms as of March 31, 2016 are as follows: Yen in millions Year ending March 31: 2017 ¥ 2018 2019 2020 2021 2022 and thereafter Total minimum future rentals ¥

Other commitments and conting51

Other commitments and contingencies, concentrations and factors that may affect future operations (Tables)	12 Months Ended
	Mar. 31, 2016
Other commitments and contingencies, concentrations and factors that may affect future operations
Schedule of Product Warranty Liability	Yen in millions March 31 2015 2016 Balance at beginning of year ¥ ¥ Addition Utilization ) ) Foreign exchange impact ) Balance at end of year ¥ ¥

Segment information (Tables)

Segment information (Tables)	12 Months Ended
	Mar. 31, 2015
Segment information
Schedule of Entity-Wide Information, Revenue from External Customers by Products and Services	Yen in millions For the year ended March 31 2014 2015 2016 Net sales: Small precision motors: Hard disk drives spindle motors ¥ ¥ ¥ Other small precision motors Sub-total Automotive, appliance, commercial and industrial products Machinery Electronic and optical components Others Consolidated total ¥ ¥ ¥
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area	Yen in millions For the year ended March 31 2014 2015 2016 Net sales: Japan ¥ ¥ ¥ U.S.A. Singapore Thailand Germany China Other Consolidated total ¥ ¥ ¥ Yen in millions March 31 2015 2016 Long-lived assets: Japan ¥ ¥ U.S.A. Singapore Thailand Germany China Other Consolidated total ¥ ¥
Schedule of Segment Reporting Information, by Segment	Yen in millions For the year ended March 31 2014 2015 2016 Net sales to external customers: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Adjustments *1 ) ) Consolidated total ¥ ¥ ¥ *1 Adjustments primarily relate to the difference between recognition of revenue at the time of shipment and at the time of customer receipt. Yen in millions For the year ended March 31 2014 2015 2016 Net sales to other operating segments: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Intersegment elimination ) ) ) Consolidated total — — — Yen in millions For the year ended March 31 2014 2015 2016 Operating income (loss): Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal ) Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Reclassification *1 U.S. GAAP adjustments and Others *2 ) ) ) Consolidation adjustments mainly related to elimination of intersegment income or loss Corporate*3 ) ) ) ¥ ¥ ¥ *1 Some items are reclassified from other expenses (income) and included in operating expenses (income). Main reclassification is income or loss from sales or disposals of fixed assets for the years ended March 31, 2014, 2015 and 2016. *2 Others is mainly from the amortization of identifiable intangible assets related to business combinations for the years ended March 31, 2014, 2015 and 2016 . *3 Corporate includes basic research expenses and head office expenses. Yen in millions For the year ended March 31 2014 2015 2016 Depreciation: Nidec Corporation ¥ ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total U.S. GAAP adjustments*1, Corporate, and Others*2 ) ) ) Consolidated total ¥ ¥ ¥ *1 Some l eased assets are not capitalized in the operating segments but are capitalized under U.S. GAAP. *2 The amount of each segment includes amortization of intangible assets. Others mainly represent adjustments to exclude the amortization of intangible assets in order to reconcile amounts to consolidated total of depreciation in consolidated statements of cash flows. Yen in millions March 31 2015 2016 Segment assets: Nidec Corporation ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Elimination of intersegment assets and corporate, net of taxes*1 ) ) Identifiable intangible assets and other fair value adjustments Goodwill U.S.GAAP adjustments and Others *2 ) ) Consolidated total ¥ ¥ *1 Elimination of intersegment assets and corporate, net of taxes include corporate assets, which do not belong to any operating segment, of ¥ 171,462 million and ¥ 196,144 million as of March 31, 2015 and 2016, respectively. The depreciation related with the corporate assets is allocated to each operating segment in accordance with the rational allocation method. *2 Others is mainly due to the reclassification of deferred tax assets and liabilities on consolidation. Yen in millions For the year ended March 31 2015 2016 Capital expenditure for segment assets: Nidec Corporation ¥ ¥ Nidec Electronics (Thailand) Nidec Singapore Nidec (H.K.) Nidec Sankyo Nidec Copal Nidec Techno Motor Nidec Motor Nidec Motors & Actuators All Others Total Corporate Consolidated total ¥ ¥

Subsequent events (Tables)

Subsequent events (Tables)	12 Months Ended
	Mar. 31, 2016
Subsequent events
Schedule of Acquisition of Motortecnica s.r.l.	1) Purpose of the Transaction IMEP develops, manufactures and sells products of washing machine and drying machine motors. Through the Transaction, NIDEC expects to enhance the competitiveness of its appliance motor business in the European market, one of Appliance, Commercial and Industrial Motors business (“ACIM”) on which it particularly places emphasis. NIDEC also expects to obtain IMEP’s major customers. In addition, NIDEC intends to build up a major manufacturing base in an emerging EU market for its ACIM. 2) Funds NIDEC utilizes its cash on hand for funding.

Summary of Significant Accoun54

Summary of Significant Accounting Policies (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Summary of significant accounting policies
Cash withdraws from a financial institution, net against cash in audited consolidated financial statements	¥ 3,831
Depreciation	55,298	¥ 45,087	¥ 39,497
Advertising costs	¥ 684	¥ 525	¥ 477
Proprietary technology | Weighted Average
Summary of significant accounting policies
Weighted average amortization period (in years)	12 years
Customer relationships | Weighted Average
Summary of significant accounting policies
Weighted average amortization period (in years)	18 years
Software | Weighted Average
Summary of significant accounting policies
Weighted average amortization period (in years)	6 years
Factories to produce NIDEC's products | Minimum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	7 years
Factories to produce NIDEC's products | Maximum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	47 years
Head office and sales offices
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	50 years
Leasehold Improvements | Minimum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	3 years
Leasehold Improvements | Maximum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	18 years
Machinery and equipment | Minimum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	2 years
Machinery and equipment | Maximum
Summary of significant accounting policies
Property, plant and equipment, estimated useful life (in years)	15 years

Acquisitions and dispositions55

Acquisitions and dispositions (Details) - JPY (¥) ¥ in Millions	Sep. 08, 2015	Sep. 01, 2015	Aug. 31, 2015	Aug. 24, 2015	Jul. 31, 2015	Jun. 02, 2015	May 15, 2015	Feb. 02, 2015	Mar. 31, 2014	Jan. 01, 2014
Nidec Logistics Corporation | Discontinued Operations
Acquisitions and dispositions
Business disposition, cash received								¥ 5,000
Business disposition, gain on sales of stocks in subsidiary								1,182
Mitsubishi Materials C.M.I. Corporation (currently Nidec Sankyo CMI Corporation)
Acquisitions and dispositions
Business acquisition, cash paid										¥ 5,228
Honda Elesys Co., Ltd. (currently Nidec Elesys Corporation)
Acquisitions and dispositions
Business acquisition, cash paid									¥ 24,320
Gerte- und Pumpenbau GmbH Dr. Eugen Schmidt ("GPM")
Acquisitions and dispositions
Business acquisition, cash paid								¥ 30,024
Motortecnica s.r.l
Acquisitions and dispositions
Business acquisition, cash paid							¥ 1,897
Sejin Electron (Hong Kong) Co., Limited (currently SCD (Hong Kong) Co., LTD.)
Acquisitions and dispositions
Business acquisition, cash paid						¥ 424
Business acquisition, percentage of voting rights before acquisition						50.00%
Business acquisition, percentage of voting rights after acquisition						100.00%
Switched reluctance (SR) motor and drive business of China Tex Mechanical & Electrical Engineering Ltd. (currently Nidec (Beijing) Drive Technologies Co., Ltd.)
Acquisitions and dispositions
Business acquisition, cash paid					¥ 407
Arisa, S.A. (currently Nidec Arisa S.L.U.)
Acquisitions and dispositions
Business acquisition, cash paid				¥ 3,878
KB Electronics, Inc.
Acquisitions and dispositions
Business acquisition, cash paid			¥ 3,672
E.M.G. Elettromeccanica S.r.l
Acquisitions and dispositions
Business acquisition, cash paid		¥ 931
PT. Nagata Opto Indonesia
Acquisitions and dispositions
Business acquisition, cash paid	¥ 212

Acquisitions and dispositions -

Acquisitions and dispositions - Adjustments (Details 2) - Mitsubishi Materials Cmi Corporation Honda Elesys Limited Liability Company And Gpm ¥ in Millions	12 Months Ended
	Mar. 31, 2015JPY (¥)
Business Acquisition [Line Items]
Business combination, adjustment, current assets	¥ (1,499)
Business combination, adjustment, property, plant and equipment	3,144
Business combination, adjustment, goodwill	(9,471)
Business combination, adjustment, intangible assets	9,972
Business combination, adjustment, other noncurrent assets	55
Business combination, adjustment, liability	2,400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Equity Interests	(199)
Business combination, adjustment, operating income	(279)
Business combination, adjustment, income before income taxes	(279)
Business combination, adjustment, net income attributable to Nidec Corporation	(201)
Trademarks
Business Acquisition [Line Items]
Business combination, adjustment, intangible assets	3,156
Customer relationships
Business Acquisition [Line Items]
Business combination, adjustment, intangible assets	¥ 3,647
Weighted average amortization period (in years)	20 years
Developed technologies
Business Acquisition [Line Items]
Business combination, adjustment, intangible assets	¥ 3,169
Weighted average amortization period (in years)	15 years

Acquisitions and dispositions57

Acquisitions and dispositions - Pro forma results (Details 3) ¥ / shares in Units, ¥ in Millions	Apr. 01, 2014	Mar. 31, 2015JPY (¥)¥ / shares	Mar. 31, 2014JPY (¥)¥ / shares
Acquisitions and dispositions
Common stock, stock split	2
Gerte- und Pumpenbau GmbH Dr. Eugen Schmidt ("GPM")
Acquisitions and dispositions
Pro forma net sales | ¥		¥ 1,065,579	¥ 909,356
Pro forma net income | ¥		¥ 77,052	¥ 56,795
Pro forma net income attributable to Nidec Corporation per share
Basic | ¥ / shares		¥ 275.31	¥ 208.75
Diluted | ¥ / shares		¥ 259.54	¥ 195.30

Goodwill and other intangible58

Goodwill and other intangible assets (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Goodwill and other intangible assets
Gross carrying amounts	¥ 102,915	¥ 103,800
Accumulated amortization	37,900	32,132
Carrying amounts	65,015	71,668
Proprietary technology
Goodwill and other intangible assets
Gross carrying amounts	15,182	15,652
Accumulated amortization	4,444	3,485
Carrying amounts	10,738	12,167
Customer relationships
Goodwill and other intangible assets
Gross carrying amounts	56,430	58,881
Accumulated amortization	16,893	13,934
Carrying amounts	39,537	44,947
Software
Goodwill and other intangible assets
Gross carrying amounts	24,085	21,659
Accumulated amortization	12,676	10,979
Carrying amounts	11,409	10,680
Other
Goodwill and other intangible assets
Gross carrying amounts	7,218	7,608
Accumulated amortization	3,887	3,734
Carrying amounts	¥ 3,331	¥ 3,874

Goodwill and other intangible59

Goodwill and other intangible assets - Amortization (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Line Items]
Total amortization of intangible assets	¥ 8,288	¥ 7,206	¥ 6,393
Total indefinite lived intangible assets	¥ 11,844	¥ 12,262
Weighted Average | Proprietary technology
Goodwill and Intangible Assets Disclosure [Line Items]
Weighted average amortization period (in years)	12 years
Weighted Average | Customer relationships
Goodwill and Intangible Assets Disclosure [Line Items]
Weighted average amortization period (in years)	18 years
Weighted Average | Software
Goodwill and Intangible Assets Disclosure [Line Items]
Weighted average amortization period (in years)	6 years

Goodwill and other intangible60

Goodwill and other intangible assets - Five years (Details 3) ¥ in Millions	Mar. 31, 2016JPY (¥)
Goodwill and other intangible assets
2,017	¥ 8,374
2,018	7,643
2,019	6,921
2,020	5,860
2,021	¥ 4,823

Goodwill and other intangible61

Goodwill and other intangible assets - Goodwill (Details 4) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Goodwill [Line Items]
Beginning Balance	¥ 162,959	¥ 152,368
Acquisition	4,996	4,319
Impairment loss	0	0	¥ 0
Translation adjustments and Others	(4,992)	6,272
Ending Balance	162,963	162,959	152,368
Nidec Electronics (Thailand)
Goodwill [Line Items]
Beginning Balance	8,948	7,645
Translation adjustments and Others	678	1,303
Ending Balance	9,626	8,948	7,645
Nidec Sankyo
Goodwill [Line Items]
Beginning Balance	28,794	28,685
Acquisition	115
Translation adjustments and Others	(66)	109
Ending Balance	28,843	28,794	28,685
Nidec Copal
Goodwill [Line Items]
Beginning Balance	16,462	16,462
Ending Balance	16,462	16,462	16,462
Nidec Techno Motor
Goodwill [Line Items]
Beginning Balance	2,049	2,049
Ending Balance	2,049	2,049	2,049
Nidec Motor
Goodwill [Line Items]
Beginning Balance	66,302	62,692
Acquisition	3,757
Translation adjustments and Others	(3,165)	3,610
Ending Balance	66,894	66,302	62,692
Nidec Motors & Actuators
Goodwill [Line Items]
Beginning Balance	21,484	16,699
Acquisition		4,319
Translation adjustments and Others	(502)	466
Ending Balance	20,982	21,484	16,699
All Others
Goodwill [Line Items]
Beginning Balance	18,920	18,136
Acquisition	1,124
Translation adjustments and Others	(1,937)	784
Ending Balance	¥ 18,107	¥ 18,920	¥ 18,136

Supplemental cash flow inform62

Supplemental cash flow information (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Cash paid during the fiscal year for:
Income taxes	¥ 24,821	¥ 22,290	¥ 12,613
Interest	1,693	1,463	1,636
Non-cash investing and financing activities:
Capital lease obligations	8,045	70	499
Conversion of convertible bond	¥ 21,449	74,344
Treasury stock, at cost
Non-cash investing and financing activities:
Change in ownership of subsidiaries in connection with share exchange transaction		(11,960)	(20,655)
Share Exchange Transaction | Common stock
Non-cash investing and financing activities:
Change in ownership of subsidiaries in connection with share exchange transaction		5,175	4,279
Share Exchange Transaction | Treasury stock, at cost
Non-cash investing and financing activities:
Change in ownership of subsidiaries in connection with share exchange transaction		¥ 11,960	¥ 20,655

Allowance for doubtful accoun63

Allowance for doubtful accounts (Details) - Allowance-for-doubtful accounts - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of the year	¥ 1,295	¥ 1,593	¥ 1,375
Provision for doubtful accounts, net of reversal	336	(388)	366
Write-offs	(301)	(37)	(267)
Translation adjustment and other	(60)	127	119
Allowance for doubtful accounts at the end of the year	¥ 1,270	¥ 1,295	¥ 1,593

Inventories (Details)

Inventories (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Inventories
Finished goods	¥ 77,670	¥ 75,398
Raw materials	52,325	51,182
Work in process	36,308	39,187
Supplies and other	4,648	5,107
Inventories	¥ 170,951	¥ 170,874

Other current assets (Details)

Other current assets (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Other current assets
Other receivable	¥ 18,003	¥ 19,901
Deferred tax assets	9,133	9,159
Costs on uncompleted construction contracts	12,941	9,701
Prepaid expenses	5,978	6,612
Other	7,095	5,249
Other current assets	¥ 53,150	¥ 50,622

Marketable securities and oth66

Marketable securities and other securities investments (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Available-for-sale Securities, Fair Value to Amortized Cost Basis
Equity securities, cost	¥ 7,323	¥ 7,630
Equity securities, gross unrealized gains	5,958	11,423
Equity securities, gross unrealized losses	54
Equity securities, fair value	13,227	19,053
Debt securities, cost	281	330
Debt securities, fair value	281	330
Held -to-maturity
Cost	8,505	8,360
Gross unrealized gains	5,967	11,425
Gross unrealized losses	54
Fair value	14,418	19,785
Securities not practicable to estimate fair value, cost	1,595	1,733
Japanese government debt securities
Held -to-maturity
Held-to-maturity Securities, Total	901	400
Held-to-maturity securities, gross unrealized gains	9	2
Held-to-maturity securities, fair value	¥ 910	¥ 402

Marketable securities and oth67

Marketable securities and other securities investments - Narratives (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Marketable securities and other securities investments
Increase (decrease) in net unrealized gain on available-for-sale securities included as a component of accumulated other comprehensive income, net of applicable taxes	¥ (3,714)	¥ 3,227	¥ 2,998
Proceeds from sales of marketable securities	1,319	68	1,059
Gross realized gains on marketable securities	943	26	242
Gross realized losses on marketable securities	1	0	¥ 12
Held-to-maturity securities pledged as collateral for the deferred payments of certain taxes	¥ 901	¥ 400

Marketable securities and oth68

Marketable securities and other securities investments - Gross unrealized losses (Details 3) ¥ in Millions	12 Months Ended
	Mar. 31, 2016JPY (¥)
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	¥ 1,020
Less than 12 months, Unrealized loss	54
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair value	1,020
Less than 12 months, Unrealized loss	¥ 54

Other non-current assets (Detai

Other non-current assets (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Other non-current assets
Intangible assets	¥ 76,859	¥ 83,931
Other	13,709	15,630
Other non-current assets	¥ 90,568	¥ 99,561

Short-term borrowings and lon70

Short-term borrowings and long-term debt (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Short-term borrowings and long-term debt
Short-term borrowings	¥ 81,092	¥ 52,401
Unused lines of credit	218,973
Unsecured loans, principally from banks
Short-term borrowings and long-term debt
Short-term borrowings	¥ 81,004	¥ 52,401
Short-term borrowings, average interest per annum	0.23%	0.17%
Secured loans, principally from banks
Short-term borrowings and long-term debt
Short-term borrowings	¥ 88
Short-term borrowings, average interest per annum	5.98%

Short-Term Borrowings and Lon71

Short-Term Borrowings and Long-Term Debt - Long-term debt (Details 2) ¥ / shares in Units, ¥ in Millions	Apr. 01, 2014item	Mar. 31, 2016JPY (¥)¥ / shares	Mar. 31, 2015JPY (¥)item¥ / shares
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 219,690	¥ 230,097
Less-Current portion due within one year		(82,796)	(45,485)
Less-Capital lease obligation current portion due within one year		(2,273)	(1,924)
Long-term portion		136,894	184,612
Common stock, stock split	2
Capital lease obligations, Due 2015 to 2020 in 2015
Short-Term Borrowings and Long-Term Debt
Capital lease obligations			¥ 3,481
Capital lease obligations, Due 2015 to 2020 in 2015 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			0.00%
Capital lease obligations, Due 2015 to 2020 in 2015 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			15.74%
Capital lease obligations, Due 2016 to 2023 in 2016
Short-Term Borrowings and Long-Term Debt
Capital lease obligations		¥ 8,748
Capital lease obligations, Due 2016 to 2023 in 2016 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		0.00%
Capital lease obligations, Due 2016 to 2023 in 2016 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		15.74%
Unsecured loans due 2015 to 2026
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations			¥ 53,789
Unsecured loans due 2015 to 2026 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			0.17%
Unsecured loans due 2015 to 2026 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			6.40%
Unsecured loans due 2016 to 2026
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 59,616
Unsecured loans due 2016 to 2026 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		0.00%
Unsecured loans due 2016 to 2026 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		14.79%
Secured loans due 2015 to 2024
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations			¥ 1,372
Secured loans due 2015 to 2024 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			1.45%
Secured loans due 2015 to 2024 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate			3.50%
Secured Loans due 2016 To 2023
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 1,326
Secured Loans due 2016 To 2023 | Minimum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		1.95%
Secured Loans due 2016 To 2023 | Maximum
Short-Term Borrowings and Long-Term Debt
Long-term debt, interest rate		3.50%
Zero Coupon Convertible Bonds Due 2015
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations			¥ 21,455
Less-Current portion due within one year		¥ (50,000)	¥ (21,455)
Long-term debt, conversion price | ¥ / shares		¥ 5,313	¥ 10,626
Principal amount			¥ 21,445
Unamortized premium			10
Total			¥ 21,455
Redemption price as percentage of principal amount		100.00%
Number of convertible shares | item	18,021,833		9,010,916
Unsecured straight bonds due 2017
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 65,000	¥ 65,000
Long-term debt, interest rate		0.39%	0.39%
Unsecured straight bonds due 2019
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 15,000	¥ 15,000
Long-term debt, interest rate		0.60%	0.60%
Unsecured straight bonds due 2022
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 20,000	¥ 20,000
Long-term debt, interest rate		0.96%	0.96%
Unsecured straight bonds due 2016
Short-Term Borrowings and Long-Term Debt
Long-term debt and capital lease obligations		¥ 50,000	¥ 50,000
Long-term debt, interest rate		0.21%	0.21%
Long term debt, excluding zero coupon convertible bonds due 2015
Short-Term Borrowings and Long-Term Debt
Less-Current portion due within one year		¥ (30,523)	¥ (22,106)

Short-Term Borrowings and Lon72

Short-Term Borrowings and Long-Term Debt - Annual maturity (Details 3) ¥ in Millions	Mar. 31, 2016JPY (¥)
Short-term borrowings and long-term debt
2,017	¥ 82,796
2,018	72,386
2,019	562
2,020	15,544
2,021	28,161
2022 and thereafter	¥ 20,241

Short-Term Borrowings and Lon73

Short-Term Borrowings and Long-Term Debt (Details 4) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Short-Term Borrowings and Long-Term Debt
short-term borrowings, current portion of long-term debt. and long-term debt	¥ 219,690	¥ 230,097
Short-term borrowings	81,092	¥ 52,401
Certain Subsidiaries | Land and building
Short-Term Borrowings and Long-Term Debt
Book value of machinery, land and building pledged	2,744
short-term borrowings, current portion of long-term debt. and long-term debt	1,414
Certain Subsidiaries | Building
Short-Term Borrowings and Long-Term Debt
Book value of machinery, land and building pledged	854
Short-term borrowings	¥ 88

Other Current Liabilities (Deta

Other Current Liabilities (Detail) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Other current liabilities
Accounts payable for property, plant and equipment	¥ 6,730	¥ 7,989
Advances received	15,817	7,813
Income taxes payable	5,831	6,039
Product warranty liabilities	3,988	3,887
Other	12,022	10,961
Other current liabilities	¥ 44,388	¥ 36,689

Pension and severance plans (De

Pension and severance plans (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Change in plan assets:
Fair value of plan assets at beginning of year	¥ 28,258
Fair value of plan assets at end of year	26,030	¥ 28,258
Japanese plans
Change in benefit obligation:
Benefit obligation at beginning of year	18,194	17,666
Service cost	1,182	1,167	¥ 927
Interest cost	171	188	180
Actuarial loss	2,375	832
Plan amendment		(190)
Benefits paid	(2,276)	(1,469)
Benefit obligation at end of year	19,646	18,194	17,666
Change in plan assets:
Fair value of plan assets at beginning of year	14,929	11,777
Actual return on plan assets	936	1,029
Employer contribution	625	3,167
Benefits paid	(1,167)	(1,044)
Fair value of plan assets at end of year	15,323	14,929	¥ 11,777
Funded status	¥ (4,323)	¥ (3,265)

Pension and severance plans - I

Pension and severance plans - Included in consolidated BS (Details 2) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Accrued pension and severance costs	¥ 19,169	¥ 19,576
Japanese plans
Pension and severance plans
Net amounts recognized	4,323	3,265
Japanese plans | Accrued pension and severance costs
Pension and severance plans
Accrued pension and severance costs	5,335	5,116
Japanese plans | Other non-current assets
Pension and severance plans
Other non-current assets	¥ (1,012)	¥ (1,851)

Pension and severance plans -77

Pension and severance plans - Included in AOCI (Details 3) - Japanese plans - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Actuarial loss	¥ 221	¥ (1,684)
Prior service credit	1,211	1,381
Pension liability adjustments, pre-tax	1,432	(303)
Accumulated benefit obligations	¥ 19,447	¥ 17,876

Pension and severance plans - A

Pension and severance plans - Accumulated benefit obligations exceed plan assets (Details 4) - Japanese plans - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Projected benefit obligations	¥ 11,233	¥ 11,056
Accumulated benefit obligations	10,812	10,763
Fair value of plan assets	¥ 5,897	¥ 5,941

Pension and severance plans - W

Pension and severance plans - Weighted-average assumptions (Details 5) - Japanese plans	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Discount rate	0.50%	1.20%
Rate of compensation increase	2.90%	4.10%

Pension and severance plans -80

Pension and severance plans - Weighted-average assumptions, costs (Details 6) - Japanese plans	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Pension and severance plans
Discount rate	1.20%	1.20%	1.30%
Expected return on plan assets	2.50%	2.50%	2.60%
Rate of compensation increase	4.10%	4.20%	2.20%

Pension and severance plans - C

Pension and severance plans - Components of net periodic (benefit) cost (Details 7) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Components of net periodic (benefit) cost:
Estimated prior service cost (credit) for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost	¥ 170
Estimated net actuarial gain (loss) for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost	173
Japanese plans
Components of net periodic (benefit) cost:
Service cost	1,182	¥ 1,167	¥ 927
Interest cost	171	188	180
Expected return on plan assets	(313)	(236)	(164)
Amortization of net actuarial loss	60	79	92
Amortization of prior service credit	(170)	(207)	(157)
Net periodic pension cost	¥ 930	¥ 991	¥ 878

Pension and severance plans - F

Pension and severance plans - Foreign plans (Details 8) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Change in plan assets:
Fair value of plan assets at beginning of year	¥ 28,258
Fair value of plan assets at end of year	26,030	¥ 28,258
Foreign plans
Change in benefit obligation:
Benefit obligation at beginning of year	27,619	21,966
Service cost	787	508	¥ 553
Interest cost	731	828	741
Actuarial gain(loss)	(735)	3,689
Settlement	(1,306)
Acquisition and other	(10)	(51)
Foreign currency exchange rate changes	(1,254)	1,948
Benefits paid	(1,395)	(1,269)
Benefit obligation at end of year	24,437	27,619	21,966
Change in plan assets:
Fair value of plan assets at beginning of year	13,329	10,113
Actual return on plan assets	10	1,177
Employer contribution	160	1,054
Settlement	(1,306)	(25)
Foreign currency exchange rate changes and other	(687)	1,804
Benefits paid	(799)	(794)
Fair value of plan assets at end of year	10,707	13,329	¥ 10,113
Funded status	¥ (13,730)	¥ (14,290)

Pension and severance plans -83

Pension and severance plans - Foreign plans, included in the consolidated balance sheet (Details 9) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Accrued pension and severance costs	¥ 19,169	¥ 19,576
Foreign plans
Pension and severance plans
Net amounts recognized	13,730	14,290
Accrued pension and severance costs | Foreign plans
Pension and severance plans
Accrued pension and severance costs	13,823	¥ 14,290
Other non-current assets | Foreign plans
Pension and severance plans
Other non-current assets	¥ (93)

Pension and severance plans -84

Pension and severance plans - Foreign plans, included in AOCI (Details 10) - Foreign plans - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Actuarial gain(loss)	¥ (1,206)	¥ (4,501)
Pension liability adjustments, pre-tax	(1,206)	(4,501)
Accumulated benefit obligations	¥ 24,189	¥ 25,936

Pension and severance plans -85

Pension and severance plans - Foreign plans, accumulated benefit obligations exceed plan (Details 11) - Foreign plans - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Projected benefit obligations	¥ 23,815	¥ 27,045
Accumulated benefit obligations	23,613	25,362
Fair value of plan assets	¥ 10,038	¥ 12,595

Pension and severance plans -86

Pension and severance plans - Foreign plans, weighted-average assumptions(Details 12) - Foreign plans	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Discount rate	3.50%	3.30%
Rate of compensation increase	3.00%	3.50%

Pension and severance plans -87

Pension and severance plans - Foreign plans, Weighted-average assumptions, costs (Details 13) - Foreign plans	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Pension and severance plans
Discount rate	3.30%	4.40%	4.40%
Expected return on plan assets	7.50%	7.60%	7.50%
Rate of compensation increase	3.50%	3.00%	3.00%

Pension and severance plans - J

Pension and severance plans - Japanese plans (Details 14) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Components of net periodic (benefit) cost:
Estimated net actuarial gain (loss) for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost	¥ 173
Foreign plans
Components of net periodic (benefit) cost:
Service cost	787	¥ 508	¥ 553
Interest cost	731	828	741
Expected return on plan assets	(370)	(1,170)	(443)
Amortization of net actuarial loss	179	14	27
Net periodic pension cost	1,327	¥ 180	¥ 878
Estimated net actuarial gain (loss) for the defined benefit pension plans that will be amortized from accumulated other comprehensive income into benefits cost	¥ 92
Equity securities
Components of net periodic (benefit) cost:
Percentage of investments in securities or other investment vehicles	2.00%
Debt Securities
Components of net periodic (benefit) cost:
Percentage of investments in securities or other investment vehicles	5.00%
Other than Securities Investment
Components of net periodic (benefit) cost:
Percentage of investments in securities or other investment vehicles	93.00%

Pension and severance plans -89

Pension and severance plans - Japanese plans, change in plan assets (Details 15) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Pension and severance plans
Fair values of pension plan assets	¥ 26,030	¥ 28,258
Japanese companies
Pension and severance plans
Fair values of pension plan assets	264	335
Foreign companies
Pension and severance plans
Fair values of pension plan assets	201	262
Pooled funds
Pension and severance plans
Fair values of pension plan assets	1,334	1,019
Cash and cash equivalents
Pension and severance plans
Fair values of pension plan assets	3,897	4,175
Life insurance company general accounts
Pension and severance plans
Fair values of pension plan assets	5,532	6,063
Pooled Funds
Pension and severance plans
Fair values of pension plan assets	11,760	14,090
Others
Pension and severance plans
Fair values of pension plan assets	3,042	2,314
Level 1
Pension and severance plans
Fair values of pension plan assets	4,362	4,772
Level 1 | Japanese companies
Pension and severance plans
Fair values of pension plan assets	264	335
Level 1 | Foreign companies
Pension and severance plans
Fair values of pension plan assets	201	262
Level 1 | Cash and cash equivalents
Pension and severance plans
Fair values of pension plan assets	3,897	4,175
Level 2
Pension and severance plans
Fair values of pension plan assets	21,668	23,486
Level 2 | Pooled funds
Pension and severance plans
Fair values of pension plan assets	1,334	1,019
Level 2 | Life insurance company general accounts
Pension and severance plans
Fair values of pension plan assets	5,532	6,063
Level 2 | Pooled Funds
Pension and severance plans
Fair values of pension plan assets	11,760	14,090
Level 2 | Others
Pension and severance plans
Fair values of pension plan assets	¥ 3,042	¥ 2,314

Pension and severance plans - P

Pension and severance plans - Percentage of pooled funds (Details 16)	Mar. 31, 2016	Mar. 31, 2015
Debt securities, Pooled funds, Japanese bonds
Pension and severance plans
Percentage of pooled funds	65.00%	65.00%
Debt securities, Pooled funds, foreign bonds
Pension and severance plans
Percentage of pooled funds	35.00%	35.00%
Other assets, Pooled funds, Japanese equities
Pension and severance plans
Percentage of pooled funds	9.00%	4.00%
Other assets, Pooled funds, foreign equities
Pension and severance plans
Percentage of pooled funds	27.00%	28.00%
Other assets, Pooled funds, Japanese bonds
Pension and severance plans
Percentage of pooled funds	8.00%	7.00%
Other assets, Pooled funds, foreign bonds
Pension and severance plans
Percentage of pooled funds	46.00%	47.00%

Pension and severance plans -91

Pension and severance plans - Future benefit payments (Details 18) ¥ in Millions	12 Months Ended
	Mar. 31, 2016JPY (¥)
Pension and severance plans
Defined benefit plans, expected employer contribute for the next fiscal year	¥ 1,801
Japanese plans
Pension and severance plans
2,017	857
2,018	779
2,019	1,090
2,020	945
2,021	914
Years 2022-2026	5,820
Foreign plans
Pension and severance plans
2,017	1,092
2,018	1,072
2,019	1,159
2,020	1,115
2,021	1,250
Years 2022-2026	¥ 5,662

Pension and severance plans - M

Pension and severance plans - Multiemployer plans (Details 19) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Certain Subsidiaries
Pension and severance plans
Multiemployer plans, total amounts of cost recognized for contributions	¥ 115	¥ 169	¥ 169
Defined contribution plans, cost recognized for certain subsidiaries' contributions	3,270	¥ 3,103	¥ 2,617
NIDEC
Pension and severance plans
Multiemployer, expected employer contribution	109
Defined contribution plans, expected employer contribution	¥ 3,301

Other long-term liabilities (De

Other long-term liabilities (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Other long-term liabilities
Deferred tax liabilities	¥ 28,807	¥ 30,512
Other	6,619	6,593
Other long-term liabilities	¥ 35,426	¥ 37,105

Equity (Details)

Equity (Details) ¥ / shares in Units, ¥ in Millions	Oct. 01, 2014shares	Apr. 01, 2014	Oct. 01, 2013shares	Oct. 31, 2014shares	Mar. 31, 2016JPY (¥)¥ / sharesshares	Mar. 31, 2015JPY (¥)shares	Mar. 31, 2014JPY (¥)	Sep. 30, 2014	Sep. 30, 2013
Equity
Percentage of cash dividends that must be appropriated as a legal reserve					10.00%
Appropriated legal reserve not required after percentage limit is achieved					25.00%
Appropriated legal reserve, minimum actual percentage of stated capital					25.00%
Amount of statutory retained earnings of the Company available for dividend payments to shareholders | ¥					¥ 166,429	¥ 185,289
Retained earnings, cash dividends | ¥					¥ 11,864
Retained earnings, cash dividends per share | ¥ / shares					¥ 40
Purchase of treasury stock, value | ¥					¥ 12,133	¥ 2,159	¥ 2,838
Treasury stock, shares | shares					1,541,210	9,636
Treasury stock, at cost, value | ¥					¥ 12,111	¥ 27
Stock split ratio		2
Retained earnings relating to equity in undistributed earnings of accumulated deficit of equity method investee | ¥					167	155	168
Nidec Copal
Equity
Purchase of additional interests in subsidiaries, percentage owned by parent company			100.00%						66.50%
Nidec Copal | Share Exchange Transaction
Equity
Purchase of additional interests in subsidiaries, shares of common stock held in treasury allocated for the share exchange | shares			4,856,764
Nidec Tosok
Equity
Purchase of additional interests in subsidiaries, percentage owned by parent company			100.00%						72.30%
Nidec Tosok | Share Exchange Transaction
Equity
Purchase of additional interests in subsidiaries, shares of common stock held in treasury allocated for the share exchange | shares			2,624,000
Nidec Copal Electronics
Equity
Purchase of additional interests in subsidiaries, percentage owned by parent company	100.00%							65.40%
Nidec Copal Electronics | Share Exchange Transaction
Equity
Purchase of additional interests in subsidiaries, shares of common stock held in treasury allocated for the share exchange | shares	3,160,575			3,160,575
Nidec-Read
Equity
Purchase of additional interests in subsidiaries, shares of common stock held in treasury allocated for the share exchange | shares				1,421,498
Purchase of additional interests in subsidiaries, percentage owned by parent company	100.00%							65.50%
Nidec-Read | Share Exchange Transaction
Equity
Purchase of additional interests in subsidiaries, shares of common stock held in treasury allocated for the share exchange | shares	1,421,498
Treasury stock, at cost
Equity
Purchase of treasury stock, value | ¥					¥ 12,133	¥ 2,159	¥ 2,838
NIDEC | Treasury stock, at cost
Equity
Treasury stock, shares | shares					1,541,210	36
Treasury stock, at cost, value | ¥					¥ 12,111	¥ 0
Repurchase at Board of Directors Meetings Resolution
Equity
Purchase of treasury stock, shares | shares					1,530,000
Purchase of treasury stock, value | ¥					¥ 12,013

Equity - Changes in AOCI (Detai

Equity - Changes in AOCI (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	¥ 134,828	¥ 58,378
Other comprehensive income (loss) before reclassifications	(59,227)	76,575
Amounts reclassified from accumulated other comprehensive income (loss)	1,128	(125)
Net change during the current period other comprehensive income (loss)	(58,099)	76,450
Balance at end of year	76,729	134,828
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	131,332	54,540
Other comprehensive income (loss) before reclassifications	(53,941)	76,856
Amounts reclassified from accumulated other comprehensive income (loss)	233	(64)
Net change during the current period other comprehensive income (loss)	(53,708)	76,792
Balance at end of year	77,624	131,332
Net unrealized gains (losses) from securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	7,412	4,185
Other comprehensive income (loss) before reclassifications	(3,059)	3,245
Amounts reclassified from accumulated other comprehensive income (loss)	(655)	(18)
Net change during the current period other comprehensive income (loss)	(3,714)	3,227
Balance at end of year	3,698	7,412
Net gains (losses) from derivative instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(1,072)	(24)
Other comprehensive income (loss) before reclassifications	(1,210)	(1,065)
Amounts reclassified from accumulated other comprehensive income (loss)	1,536	17
Net change during the current period other comprehensive income (loss)	326	(1,048)
Balance at end of year	(746)	(1,072)
Pension liability adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(2,844)	(323)
Other comprehensive income (loss) before reclassifications	(1,017)	(2,461)
Amounts reclassified from accumulated other comprehensive income (loss)	14	(60)
Net change during the current period other comprehensive income (loss)	(1,003)	(2,521)
Balance at end of year	¥ (3,847)	¥ (2,844)

Equity - Reclassification out o

Equity - Reclassification out of AOCI (Details 3) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net, selling, general and administrative expenses	¥ 5,210	¥ 3,847	¥ 404
Gain from marketable securities, net	(946)	(70)	(245)
Cost of products sold, Interest expense.	908,311	786,486	674,903
Income taxes	26,466	29,033	25,658
Consolidated net income	(92,863)	(78,088)	(58,777)
Net (income) loss attributable to noncontrolling interests	1,053	2,073	2,505
Net income attributable to Nidec Corporation	(91,810)	(76,015)	¥ (56,272)
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income attributable to Nidec Corporation	1,128	125
Reclassification out of Accumulated Other Comprehensive Income | Foreign currency translation adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net, selling, general and administrative expenses	233	(64)
Consolidated net income	233	(64)
Net income attributable to Nidec Corporation	233	(64)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains (losses) from securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain from marketable securities, net	(942)	(26)
Income taxes	287	8
Consolidated net income	(655)	(18)
Net income attributable to Nidec Corporation	(655)	(18)
Reclassification out of Accumulated Other Comprehensive Income | Net gains (losses) from derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold, Interest expense.	2,480	28
Income taxes	(944)	(11)
Consolidated net income	1,536	17
Net income attributable to Nidec Corporation	1,536	(17)
Reclassification out of Accumulated Other Comprehensive Income | Pension liability adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net periodic pension cost	44	(114)
Income taxes	(8)	41
Consolidated net income	36	(73)
Net (income) loss attributable to noncontrolling interests	(22)	13
Net income attributable to Nidec Corporation	¥ 14	¥ (60)

Equity - Tax effects (Details 4

Equity - Tax effects (Details 4) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Foreign currency translation adjustments, Pre-tax
Foreign currency translation adjustments arising during period, Pre-tax	¥ (54,724)	¥ 77,817	¥ 43,429
Reclassification adjustments for gains and losses realized in net income, Pre-tax	233	(64)
Net unrealized gains (losses) from securities, Pre-tax
Unrealized holding gains (losses) arising during period, Pre-tax	(4,612)	5,035	4,567
Reclassification adjustments for gains and losses realized in net income, Pre-tax	(942)	(26)	(230)
Net gains (losses) from derivative instruments qualifying for cash flow hedges, Pre-tax
Unrealized gains (losses) arising during period, Pre-tax	(1,945)	(1,719)	(397)
Reclassification adjustments for gains and losses realized in net income, Pre-tax	2,480	28	(37)
Pension liability adjustment, Pre-tax
Actuarial gains (losses) arising during period, Pre-tax	(1,446)	(4,193)	1,072
Prior service credit (cost) arising during period, Pre-tax		226	74
Reclassification adjustments for actuarial gains and losses realized in net income, Pre-tax	214	93	119
Reclassification adjustments for prior service credit and cost realized in net income, Pre-tax	(170)	(207)	(157)
Other comprehensive income (loss), Pre-tax	(60,912)	76,990	48,440
Unrealized gains (losses) from securities, Tax benefit (expense)
Unrealized holding gains (losses) arising during period, Tax benefit (expense)	1,553	(1,774)	(1,440)
Reclassification adjustments for gains and losses realized in net income, Tax benefit (expense)	287	8	83
Unrealized gains (losses) from derivative instruments qualifying for cash flow hedges, Tax benefit (expense)
Unrealized gains (losses) arising during period, Tax benefit (expense)	735	654	153
Reclassification adjustments for gains and losses realized in net income, Tax benefit (expense)	(944)	(11)	15
Pension liability adjustment, Tax benefit (expense)
Actuarial gains (losses) arising during period, Tax benefit (expense)	429	1,526	(378)
Prior service credit (cost) arising during period, Tax benefit (expense)		(20)	(14)
Reclassification adjustments for actuarial gains and losses realized in net income, Tax benefit (expense)	(60)	(26)	(35)
Reclassification adjustments for prior service credit and cost realized in net income, Tax benefit (expense)	52	67	57
Other comprehensive income (loss), Tax benefit (expense)	2,052	424	(1,559)
Foreign currency translation adjustments, Net-of-tax
Foreign currency translation adjustments arising during period, Net-of-tax	(54,724)	77,817	43,429
Reclassification adjustments for gains and losses realized in net income, Net-of-tax	233	(64)
Unrealized gains (losses) from securities, Net-of-tax
Unrealized holding gains (losses) arising during period, Net-of-tax	(3,059)	3,261	3,127
Reclassification adjustments for gains and losses realized in net income, Net-of-tax	(655)	(18)	(147)
Unrealized gains (losses) from derivative instruments qualifying for cash flow hedges, Net-of-tax
Unrealized gains (losses) arising during period, Net-of-tax	(1,210)	(1,065)	(244)
Reclassification adjustments for gains and losses realized in net income, Net-of-tax	1,536	17	(22)
Pension liability adjustment, Net-of-tax
Actuarial gains (losses) arising during period, Net-of-tax	(1,017)	(2,667)	694
Prior service credit (cost) arising during period, Net-of-tax		206	60
Reclassification adjustments for actuarial gains and losses realized in net income, Net-of-tax	154	67	84
Reclassification adjustments for prior service credit and cost realized in net income, Net-of-tax	(118)	(140)	(100)
Total other comprehensive income (loss)	¥ (58,860)	¥ 77,414	¥ 46,881

Income taxes (Details)

Income taxes (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income taxes
Income from continuing operations before income taxes	¥ 119,328	¥ 107,092	¥ 84,460
The Company and domestic subsidiaries
Income taxes
Income from continuing operations before income taxes	17,492	23,398	25,262
Foreign Subsidiaries
Income taxes
Income from continuing operations before income taxes	¥ 101,836	¥ 83,694	¥ 59,198

Income taxes - Provision (Detai

Income taxes - Provision (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Current income tax expense/(benefit):
The Company and domestic subsidiaries	¥ 3,144	¥ 5,531	¥ 1,872
Foreign subsidiaries	17,181	12,799	10,139
Total current	20,325	18,330	12,011
Deferred income tax expense (benefit):
The Company and domestic subsidiaries	5,744	10,497	12,579
Foreign subsidiaries	397	206	1,068
Total deferred	6,141	10,703	13,647
Total provision	¥ 26,466	¥ 29,033	¥ 25,658

Income taxes - Reconciliation (

Income taxes - Reconciliation (Details 3)	Apr. 01, 2016	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory tax rate		33.00%	36.00%	38.00%
Increase (reduction) in taxes resulting from:
Tax benefit in foreign subsidiaries		(12.90%)	(14.30%)	(14.60%)
Tax on undistributed earnings		1.10%	2.70%	2.20%
Valuation allowance		(1.50%)	(4.30%)	(2.30%)
Liabilities for unrecognized tax benefits		0.00%	0.30%	(0.10%)
Reversal of deferred tax assets related to foreign tax credit				5.30%
Deduction for foreign taxes		1.50%	1.50%	2.40%
Withholding tax on dividends from overseas subsidiaries		1.00%	2.30%	0.00%
Changes in Japanese income tax rates		0.50%	0.70%	0.30%
Other		(0.50%)	2.20%	(0.80%)
Effective income tax rate		22.20%	27.10%	30.40%
Income tax additional disclosures
Effective income tax rate, decrease from previous year		4.90%
Effective income tax rate		22.20%	27.10%	30.40%
Statutory tax rate, approximately 1		33.00%
Statutory tax rate, approximately 2		32.20%
Forecast
Reconciliation of Statutory Federal Tax Rate [Line Items]
Statutory tax rate	31.00%

Income taxes - Tax benefit in f

Income taxes - Tax benefit in foreign subsidiaries (Details 4)	12 Months Ended
	Mar. 31, 2016
Thailand
Income Taxes [Line Items]
Tax incentives and exemption from corporate income tax, duration of benefit	8 years
The Philippines
Income Taxes [Line Items]
Tax incentives and exemption from corporate income tax, duration of benefit	4 years

Income taxes - Tax holidays (De

Income taxes - Tax holidays (Details 5) ¥ / shares in Units, ¥ in Millions	Apr. 01, 2014	Mar. 31, 2016JPY (¥)¥ / shares	Mar. 31, 2015JPY (¥)¥ / shares	Mar. 31, 2014JPY (¥)¥ / shares
Income taxes
Aggregate amounts of tax holidays | ¥		¥ 5,041	¥ 5,109	¥ 4,362
Per share - basic		¥ 16.98	¥ 18.25	¥ 16.03
Per share - diluted		¥ 16.92	¥ 17.22	¥ 15.02
Common stock, stock split	2

Income taxes - Components of de

Income taxes - Components of deferred tax assets and liabilities (Details 6) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets:
Inventories	¥ 1,823	¥ 2,528
Property, plant and equipment	2,818	4,200
Accrued bonus	1,917	2,180
Accrued enterprise tax	247	376
Pension and severance plans	3,134	3,244
Operating loss carryforwards for tax purposes	6,057	8,595
Accrued vacation	962	1,171
Accrued expenses	1,330	1,371
Other	2,163	4,685
Gross deferred tax assets	20,451	28,350
Less-Valuation allowance	(6,079)	(9,162)
Net deferred tax assets	14,372	19,188
Deferred tax liabilities:
Basis difference of acquired assets	(954)	(1,343)
Undistributed earnings not permanently reinvested	(12,540)	(13,165)
Marketable securities	(247)	(2,026)
Intangible assets	(13,383)	(14,103)
Other	(3,678)	(7,398)
Total deferred tax liabilities	(30,802)	(38,035)
Net deferred tax liabilities	(16,430)	¥ (18,847)
Operating loss carryforwards	19,571
Operating loss carryforwards with no expiration date	¥ 4,412

Income taxes - Valuation allowa

Income taxes - Valuation allowance (Details 7) - Valuation Allowance of Deferred Tax Assets - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Valuation Allowance [Line Items]
Valuation allowance at beginning of year	¥ (9,162)	¥ (14,561)	¥ (14,492)
Additions	(594)	(3,006)	(4,231)
Deductions	3,677	8,405	4,183
Impact on newly acquired companies			(21)
Valuation allowance at end of year	¥ (6,079)	¥ (9,162)	¥ (14,561)

Income taxes - Deferred tax (De

Income taxes - Deferred tax (Details 8) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Deferred tax assets:
Other current assets	¥ 9,133	¥ 9,159
Other non-current assets	4,421	4,710
Deferred tax assets and liabilities:
Other current liabilities	(1,177)	(2,204)
Other long-term liabilities	(28,807)	(30,512)
Net deferred tax liabilities	(16,430)	¥ (18,847)
Undistributed earnings of foreign subsidiaries	285,085
Undistributed earnings of foreign subsidiaries, future estimated additional deferred tax liability	¥ 20,976

Income taxes - Unrecognized tax

Income taxes - Unrecognized tax benefits (Details 9) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	¥ 2,482	¥ 2,232	¥ 2,361
Additions for tax positions of the current year	406	250	357
Reduction for tax positions of prior years	(138)		(486)
Impact on newly acquired companies	98
Balance at end of year	2,848	2,482	¥ 2,232
Unrecognized tax benefits that, if recognized, would reduce the effective tax rate	2,848
Unrecognized tax benefit, total gross accrued interest and penalty	¥ 147	¥ 96

Reconciliation of the differ107

Reconciliation of the differences between basic and diluted earnings per share (Details) - JPY (¥) ¥ / shares in Units, shares in Thousands, ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Basic net income attributable to Nidec Corporation per share:
Net income attributable to Nidec Corporation	¥ 91,810	¥ 76,015	¥ 56,272
Diluted net income attributable to Nidec Corporation per share:
Income from continuing operations attributable to Nidec Corporation	¥ 91,807	¥ 75,958	¥ 56,208
Weighted-average shares, basic:
Weighted-average shares, basic	296,808	279,873	272,078
Weighted-average shares, diluted:
Weighted-average shares, diluted	297,891	296,655	290,478
Basic net income attributable to Nidec Corporation per share
Net income attributable to Nidec Corporation	¥ 309.32	¥ 271.61	¥ 206.82
Diluted net income attributable to Nidec Corporation per share
Net income attributable to Nidec Corporation	¥ 308.19	¥ 256.05	¥ 193.50
Zero Coupon Convertible Bonds Due 2015
Effect of dilutive securities:
Zero coupon convertible bonds	¥ (3)	¥ (57)	¥ (64)
Effect of dilutive securities
Zero coupon convertible bonds	1,083	16,782	18,400

Derivatives (Details)

Derivatives (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Designated as Hedging Instrument | Foreign exchange forward contracts
Derivative
Contractual amounts	¥ 11,252	¥ 21,746
Designated as Hedging Instrument | Interest rate swap agreement
Derivative
Contractual amounts		10,014
Designated as Hedging Instrument | Commodity futures
Derivative
Contractual amounts	4,773	4,929
Not Designated as Hedging Instrument | Foreign exchange forward contracts
Derivative
Contractual amounts	1,510	¥ 1,321
Not Designated as Hedging Instrument | Currency swap contracts
Derivative
Contractual amounts	¥ 27,550

Derivatives - Contractual amoun

Derivatives - Contractual amounts outstanding (Details 2) - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Designated as Hedging Instrument | Cash Flow Hedge | Foreign exchange forward contracts | Other current assets
Derivative
Asset Derivatives		¥ 8
Designated as Hedging Instrument | Cash Flow Hedge | Foreign exchange forward contracts | Other current liabilities
Derivative
Liability Derivatives	¥ 1,032	1,584
Designated as Hedging Instrument | Cash Flow Hedge | Interest rate swap agreement | Other current liabilities
Derivative
Liability Derivatives		12
Designated as Hedging Instrument | Cash Flow Hedge | Commodity futures | Other current assets
Derivative
Asset Derivatives	48	47
Designated as Hedging Instrument | Cash Flow Hedge | Commodity futures | Other current liabilities
Derivative
Liability Derivatives	254	324
Not Designated as Hedging Instrument | Foreign exchange forward contracts | Other current liabilities
Derivative
Liability Derivatives	7	¥ 142
Not Designated as Hedging Instrument | Currency swap contracts | Other current assets
Derivative
Asset Derivatives	55
Not Designated as Hedging Instrument | Currency swap contracts | Other current liabilities
Derivative
Liability Derivatives	¥ 117

Derivatives - Narrative (Detail

Derivatives - Narrative (Details 3) ¥ in Millions	12 Months Ended
	Mar. 31, 2016JPY (¥)
Derivatives
Net loss in accumulated other comprehensive income expected to be reclassified into earnings within the next 12 months	¥ 714
The maximum length of time over which NIDEC hedged its exposure to variability in future cash flows for forecasted transactions	23 months

Derivatives - Statement of inco

Derivatives - Statement of income location (Details 4) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Designated as Hedging Instrument | Cash Flow Hedge | Foreign exchange forward contracts
Derivatives
Gains (losses) recognized in accumulated other comprehensive income	¥ 294	¥ (1,075)	¥ (229)
Designated as Hedging Instrument | Cash Flow Hedge | Foreign exchange forward contracts | Cost of sales
Derivatives
Gains (losses) reclassified from accumulated other comprehensive income into income (effective portion)	(1,031)	47	241
Designated as Hedging Instrument | Cash Flow Hedge | Interest rate swap agreement
Derivatives
Gains (losses) recognized in accumulated other comprehensive income	3	8	(5)
Designated as Hedging Instrument | Cash Flow Hedge | Interest rate swap agreement | Interest expense
Derivatives
Gains (losses) reclassified from accumulated other comprehensive income into income (effective portion)	(3)	(3)	(7)
Designated as Hedging Instrument | Cash Flow Hedge | Commodity futures
Derivatives
Gains (losses) recognized in accumulated other comprehensive income	29	19	(32)
Designated as Hedging Instrument | Cash Flow Hedge | Commodity futures | Cost of sales
Derivatives
Gains (losses) reclassified from accumulated other comprehensive income into income (effective portion)	(502)	(61)	(212)
Not Designated as Hedging Instrument | Foreign exchange forward contracts | Foreign exchange gain (loss), net
Derivatives
Gains (losses) recognized in income	268	(336)	23
Not Designated as Hedging Instrument | Currency option contracts | Foreign exchange gain (loss), net
Derivatives
Gains (losses) recognized in income		¥ (7)	¥ 18
Not Designated as Hedging Instrument | Currency swap contracts | Other, net
Derivatives
Gains (losses) recognized in income	(62)
Not Designated as Hedging Instrument | Currency swap contracts | Interest income
Derivatives
Gains (losses) recognized in income	¥ 9

Fair value (Details)

Fair value (Details) - Recurring - JPY (¥) ¥ in Millions	Mar. 31, 2016	Mar. 31, 2015
Assets:
Marketable securities	¥ 13,508	¥ 19,383
Derivatives	103	55
Total assets:	13,611	19,438
Liabilities:
Derivatives	1,410	2,062
Level 1
Assets:
Marketable securities	13,227	19,053
Derivatives	48	47
Total assets:	13,275	19,100
Liabilities:
Derivatives	254	324
Level 2
Assets:
Marketable securities	281	330
Derivatives	55	8
Total assets:	336	338
Liabilities:
Derivatives	¥ 1,156	¥ 1,738

Fair value - Financial instrume

Fair value - Financial instruments (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Carrying amount
Estimated fair value Asset (Liability)
Cash and cash equivalents	¥ 305,942	¥ 269,902
Short-term investments	1,947	2
Long-term investments	38	160
Short-term loan receivable	49	171
Long-term loan receivable	134	42
Short-term borrowings	(81,092)	(52,401)
Long-term debt including the current portion and excluding capital lease obligation and bonds	(60,941)	(55,161)
Bonds including the current portion	(150,000)	(171,455)
Estimated fair value
Estimated fair value Asset (Liability)
Cash and cash equivalents	305,942	269,902
Short-term investments	1,947	2
Long-term investments	38	160
Short-term loan receivable	49	171
Long-term loan receivable	135	41
Short-term borrowings	(81,092)	(52,401)
Long-term debt including the current portion and excluding capital lease obligation and bonds	(61,066)	(55,099)
Bonds including the current portion	¥ (151,541)	¥ (183,687)

Related Party Transactions (Det

Related Party Transactions (Details) - shares	Oct. 01, 2014	Oct. 01, 2013	Oct. 31, 2014	Oct. 31, 2013	Mar. 31, 2016
Nidec Copal | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued		4,856,764
Nidec Tosok | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued		2,624,000
Nidec Copal Electronics | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued	3,160,575		3,160,575
Nidec-Read
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued			1,421,498
Nidec-Read | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued	1,421,498
Chief Executive Officer
Related party transactions
Percentage of the outstanding shares of the Company owned by a related party					8.30%
Chief Executive Officer | Nidec Copal | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued				589,992
Chief Executive Officer | Nidec Tosok | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued				322,400
Chief Executive Officer | Nidec Copal Electronics | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued			282,624
Chief Executive Officer | Nidec-Read | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued			182,250
Business entity indirectly owned by the CEO
Related party transactions
Percentage of the outstanding shares of the Company owned by a related party					3.70%
Business entity indirectly owned by the CEO | Nidec Tosok | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued				49,600
Business entity indirectly owned by the CEO | Nidec-Read | Share Exchange Transaction
Related party transactions
Stock Issued During Period, Shares, Treasury Stock Reissued			51,030
Foundation which president is the CEO
Related party transactions
Percentage of the outstanding shares of the Company owned by a related party					0.30%
CEO's Immediate Family Member
Related party transactions
Percentage of the outstanding shares of the Company owned by a related party					1.80%

Lease commitments (Details)

Lease commitments (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Class of property
Less-Accumulated amortization	¥ (8,262)	¥ (3,289)
Leased assets, Net	5,261	4,140
Amortization expenses under capital leases	5,970	1,109	¥ 1,305
Machinery and equipment
Class of property
Leased assets, Gross	13,389	7,322
Other leased assets
Class of property
Leased assets, Gross	¥ 134	¥ 107

Lease commitments - Future mini

Lease commitments - Future minimum lease (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Lease commitments
2,017	¥ 2,314
2,018	6,571
2,019	85
2,020	87
2,021	14
2022 and thereafter	11
Total minimum lease payments	9,082
Less-Amount representing interest	(334)
Present value of net minimum lease payments	8,748
Less-Current obligations	(2,273)	¥ (1,924)
Long-term capital lease obligations	6,475
Rental expenses under operating leases	¥ 2,882	¥ 2,911	¥ 2,586

Lease commitments - Minimum ren

Lease commitments - Minimum rental payments (Details 3) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Lease commitments
Rental revenues under operating leases	¥ 151	¥ 39	¥ 175
Noncancellable Lease Obligations
Lease commitments
2,017	2,363
2,018	1,772
2,019	1,492
2,020	1,210
2,021	957
2022 and thereafter	1,489
Total minimum future rentals	¥ 9,283

Lease commitments - Future m118

Lease commitments - Future minimum lease payments (Details 5) ¥ in Millions	Mar. 31, 2016JPY (¥)
Lease commitments
2,017	¥ 127
2,018	64
2,019	34
2,020	32
2,021	32
2022 and thereafter	59
Total minimum future rentals	¥ 348

Other commitments and contin119

Other commitments and contingencies, concentrations and factors that may affect future operations (Details) ¥ in Millions	12 Months Ended
	Mar. 31, 2016JPY (¥)
Long-term Purchase Commitment [Line Items]
Commitments for the purchase of property, plant and equipment and other assets	¥ 6,101
Guarantee Lease Contracts for Customers
Long-term Purchase Commitment [Line Items]
Guarantee amount	256
Guarantee of Performance on Projects in Execution or Under Warranty
Long-term Purchase Commitment [Line Items]
Maximum exposure under guarantee	¥ 9,894

Other commitments and contin120

Other commitments and contingencies, concentrations and factors that may affect future operations - Product warranty (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Other commitments and contingencies, concentrations and factors that may affect future operations
Balance at beginning of year	¥ 3,982	¥ 3,036
Addition	1,382	1,641
Utilization	(1,167)	(947)
Foreign exchange impact	(182)	252
Balance at end of year	¥ 4,015	¥ 3,982

Segment information (Details)

Segment information (Details) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Net sales:
Net sales	¥ 1,178,290	¥ 1,028,385	¥ 875,109
Small Precision Motors
Net sales:
Net sales	447,988	397,999	362,513
Hard Disk Drives Spindle Motors
Net sales:
Net sales	207,974	204,141	185,506
Other Small Precision Motors
Net sales:
Net sales	240,014	193,858	177,007
Automotive, Appliance, Commercial and Industrial Products
Net sales:
Net sales	554,713	460,007	345,236
Machinery
Net sales:
Net sales	106,462	98,800	86,955
Electronic and Optical Components
Net sales:
Net sales	64,112	65,050	72,845
Others
Net sales:
Net sales	¥ 5,015	¥ 6,529	¥ 7,560

Segment information - Geographi

Segment information - Geographic (Details 2) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Net sales:
Net sales	¥ 1,178,290	¥ 1,028,385	¥ 875,109
Long-lived assets:
Long-lived assets	347,729	342,122
Japan
Net sales:
Net sales	271,571	268,416	238,278
Long-lived assets:
Long-lived assets	99,265	94,850
U.S.A.
Net sales:
Net sales	197,235	174,521	132,117
Long-lived assets:
Long-lived assets	27,061	28,050
Singapore
Net sales:
Net sales	72,727	70,956	63,950
Long-lived assets:
Long-lived assets	210	479
Thailand
Net sales:
Net sales	106,998	90,813	85,435
Long-lived assets:
Long-lived assets	34,666	40,598
Germany
Net sales:
Net sales	87,502	44,756	38,043
Long-lived assets:
Long-lived assets	17,350	14,676
China
Net sales:
Net sales	293,353	235,409	197,134
Long-lived assets:
Long-lived assets	81,533	80,957
Other
Net sales:
Net sales	148,904	143,514	¥ 120,152
Long-lived assets:
Long-lived assets	¥ 87,644	¥ 82,512

Segment information - Operating

Segment information - Operating segment (Details 3) - JPY (¥) ¥ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	¥ 1,178,290	¥ 1,028,385	¥ 875,109
Operating Income Loss	124,538	110,939	84,864
Depreciation	55,298	45,087	39,497
Assets	1,384,472	1,357,340
Goodwill	162,963	162,959	152,368
Capital expenditure for segment assets:	81,918	58,042	40,297
Nidec Electronics (Thailand)
Segment Reporting Disclosure [Line Items]
Goodwill	9,626	8,948	7,645
Nidec Sankyo
Segment Reporting Disclosure [Line Items]
Goodwill	28,843	28,794	28,685
Nidec Copal
Segment Reporting Disclosure [Line Items]
Goodwill	16,462	16,462	16,462
Nidec Techno Motor
Segment Reporting Disclosure [Line Items]
Goodwill	2,049	2,049	2,049
Nidec Motor
Segment Reporting Disclosure [Line Items]
Goodwill	66,894	66,302	62,692
Nidec Motors & Actuators
Segment Reporting Disclosure [Line Items]
Goodwill	20,982	21,484	16,699
All Others
Segment Reporting Disclosure [Line Items]
Goodwill	18,107	18,920	18,136
Corporate
Segment Reporting Disclosure [Line Items]
Capital expenditure for segment assets:	304	3,600
Operating Segments
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	1,178,755	1,028,568	874,232
Operating Income Loss	129,525	115,670	91,210
Depreciation	55,859	48,034	43,969
Assets	1,343,210	1,307,611
Capital expenditure for segment assets:	81,614	54,442
Operating Segments | Nidec Corporation
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	31,384	28,954	27,599
Operating Income Loss	18,031	14,083	13,184
Depreciation	360	339	456
Assets	98,653	95,092
Capital expenditure for segment assets:	735	140
Operating Segments | Nidec Electronics (Thailand)
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	89,802	74,653	67,623
Operating Income Loss	15,696	14,996	12,781
Depreciation	6,081	6,043	5,502
Assets	139,865	148,931
Capital expenditure for segment assets:	3,892	5,232
Operating Segments | Nidec Singapore
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	68,115	66,556	57,893
Operating Income Loss	1,432	1,052	709
Depreciation	111	161	197
Assets	25,399	31,977
Capital expenditure for segment assets:	36	12
Operating Segments | Nidec (H.K.)
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	113,470	81,460	69,890
Operating Income Loss	372	613	483
Depreciation	7	11	6
Assets	36,049	27,012
Capital expenditure for segment assets:	6	17
Operating Segments | Nidec Sankyo
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	129,068	122,711	98,564
Operating Income Loss	15,052	12,686	10,392
Depreciation	5,205	4,717	4,131
Assets	148,681	145,869
Capital expenditure for segment assets:	7,949	5,790
Operating Segments | Nidec Copal
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	39,525	38,670	47,023
Operating Income Loss	2,182	517	(1,323)
Depreciation	4,652	3,922	4,444
Assets	59,400	60,429
Capital expenditure for segment assets:	11,430	4,637
Operating Segments | Nidec Techno Motor
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	58,456	58,746	50,691
Operating Income Loss	5,717	7,291	6,671
Depreciation	3,140	2,805	2,573
Assets	62,665	61,677
Capital expenditure for segment assets:	4,614	3,864
Operating Segments | Nidec Motor
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	224,786	200,040	171,879
Operating Income Loss	16,674	11,690	8,880
Depreciation	9,567	8,221	8,616
Assets	178,465	162,083
Capital expenditure for segment assets:	9,321	4,475
Operating Segments | Nidec Motors & Actuators
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	247,662	172,699	105,249
Operating Income Loss	25,368	18,614	8,954
Depreciation	9,484	9,480	6,516
Assets	234,227	199,286
Capital expenditure for segment assets:	17,637	13,797
Operating Segments | All Others
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	176,487	184,079	177,821
Operating Income Loss	29,001	34,128	30,479
Depreciation	17,252	12,335	11,528
Assets	359,806	375,255
Capital expenditure for segment assets:	25,994	16,478
Unallocated Amount to Segment
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	(465)	(183)	877
Operating Income Loss	4,481	5,026	2,055
Identifiable intangible assets and other fair value adjustments
Segment Reporting Disclosure [Line Items]
Assets	26,903	24,906
U.S. GAAP adjustments and Others
Segment Reporting Disclosure [Line Items]
Operating Income Loss	(818)	(2,124)	(1,337)
Assets	(7,358)	(7,957)
U.S. GAAP Adjustment, Corporate, and Others
Segment Reporting Disclosure [Line Items]
Depreciation	(561)	(2,947)	(4,472)
Corporate
Segment Reporting Disclosure [Line Items]
Operating Income Loss	(14,019)	(10,441)	(8,330)
Assets	196,144	171,462
Intersegment elimination
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	(458,100)	(371,301)	(329,435)
Operating Income Loss	5,369	2,808	1,266
Assets	(141,246)	(130,179)
Intersegment elimination | Nidec Corporation
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	198,604	152,371	138,354
Intersegment elimination | Nidec Electronics (Thailand)
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	41,951	49,812	43,982
Intersegment elimination | Nidec Singapore
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	820	869	749
Intersegment elimination | Nidec (H.K.)
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	1,315	1,300	1,339
Intersegment elimination | Nidec Sankyo
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	336	331	312
Intersegment elimination | Nidec Copal
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	19,841	2,411	2,318
Intersegment elimination | Nidec Techno Motor
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	4,950	4,474	4,041
Intersegment elimination | Nidec Motor
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	601	383	80
Intersegment elimination | Nidec Motors & Actuators
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	22,580	21,507	20,384
Intersegment elimination | All Others
Segment Reporting Disclosure [Line Items]
Sales Revenue Net	¥ 167,102	¥ 137,843	¥ 117,876

Subsequent events (Detail)

Subsequent events (Detail) - Subsequent Event - JPY (¥) ¥ in Millions	1 Months Ended
	Apr. 30, 2016	May 31, 2016
Subsequent events
Cash dividend	¥ 11,864
Nidec Sole Motor Corporation S.R.L. | IMEP
Subsequent events
Business acquisition, percentage of shares acquired		94.80%