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Segment information (Tables) link:calculationLink link:presentationLink link:definitionLink 1056 - Disclosure - Quarterly Financial Data for the year ended March 31, 2012: (Unaudited) (Tables) link:calculationLink link:presentationLink link:definitionLink 1057 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1058 - Disclosure - Acquisitions and Dispositions - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1059 - Disclosure - Intangible Assets Subject to Amortization (Detail) link:calculationLink link:presentationLink link:definitionLink 1060 - Disclosure - Goodwill and Other Intangible Assets - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1061 - Disclosure - Estimated Aggregate Amortization Expense for Intangible Assets for the Next Five Years (Detail) link:calculationLink link:presentationLink link:definitionLink 1062 - Disclosure - Carrying Amounts of Goodwill by Operating Reportable Segment (Detail) link:calculationLink link:presentationLink link:definitionLink 1063 - Disclosure - Changes in the Carrying Amount of Goodwill (Detail) link:calculationLink link:presentationLink link:definitionLink 1064 - Disclosure - Supplemental Information Associated with the Consolidated Statements of Cash Flows (Detail) link:calculationLink link:presentationLink link:definitionLink 1065 - Disclosure - Analysis of Activity within the Allowance for Doubtful Accounts (Detail) link:calculationLink link:presentationLink link:definitionLink 1066 - Disclosure - Inventories (Detail) link:calculationLink link:presentationLink link:definitionLink 1067 - Disclosure - Other Current Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1068 - Disclosure - Marketable Securities and Other Securities Investments, Debt and Equity Securities Aggregate Fair Value, Gross Unrealized Gains and Losses and Cost (Detail) link:calculationLink link:presentationLink link:definitionLink 1069 - Disclosure - Marketable Securities and Other Securities Investments - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1070 - Disclosure - Gross Unrealized Losses on, and Fair Value of Investment Securities, Aggregated by Investment Category and Length of Time that Individual investment Securities have been in a Continuous Unrealized Loss Position (Detail) link:calculationLink link:presentationLink link:definitionLink 1071 - Disclosure - Other Non-Current Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1072 - Disclosure - Short-Term Borrowings (Detail) link:calculationLink link:presentationLink link:definitionLink 1073 - Disclosure - Short-Term Borrowings (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1074 - Disclosure - Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1075 - Disclosure - Long-Term Debt (Detail) link:calculationLink link:presentationLink link:definitionLink 1076 - Disclosure - Long-Term Debt (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1077 - Disclosure - Detail of Zero Coupon Convertible Bonds, Due 2015 (Detail) link:calculationLink link:presentationLink link:definitionLink 1078 - Disclosure - Aggregate Amounts of Annual Maturity of Long-Term Debt During the Next Five Years (Detail) link:calculationLink link:presentationLink link:definitionLink 1079 - Disclosure - Other Current Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1080 - Disclosure - Employees' Defined Benefit Plans, Japanese plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1081 - Disclosure - Amounts Included in the Consolidated Balance Sheet, Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1082 - Disclosure - Amounts Included in Accumulated Other Comprehensive income (Loss) as Pension Liability Adjustments, Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1083 - Disclosure - Pension and Severance Plans - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1084 - Disclosure - Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets, Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1085 - Disclosure - Weighted-Average Assumptions Used to Determine Benefit Obligations, Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1086 - Disclosure - Weighted Average Assumptions Used to Determine Net Pension and Severance Cost Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1087 - Disclosure - Components of Net Periodic (Benefit) Cost, Japanese Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1088 - Disclosure - Employees' Defined Benefit Plans, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1089 - Disclosure - Amounts Included in the Consolidated Balance Sheet, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1090 - Disclosure - Amounts Included in Accumulated Other Comprehensive Income (Loss) as Pension Liability Adjustments, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1091 - Disclosure - Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1092 - Disclosure - Weighted-Average Assumptions Used to Determine Benefit Obligations, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1093 - Disclosure - Weighted-Average Assumptions Used to Determine Net Pension and Severance Costs, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1094 - Disclosure - Components of Net Periodic (Benefit) Cost, Foreign Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1095 - Disclosure - Fair Value of Pension Plan Assets, by Asset Category (Detail) link:calculationLink link:presentationLink link:definitionLink 1096 - Disclosure - Fair Value of Pension Plan Assets, by Asset Category (Parenthetical) (Detail) link:calculationLink link:presentationLink link:definitionLink 1097 - Disclosure - Future Benefit Payments for Defined Benefit Plans (Detail) link:calculationLink link:presentationLink link:definitionLink 1098 - Disclosure - Other Long-Term Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1099 - Disclosure - Equity - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1100 - Disclosure - Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) and Reclassification Adjustments, Including Amounts Attributable to Noncontrolling Interests (Detail) link:calculationLink link:presentationLink link:definitionLink 1101 - Disclosure - Components of Income from Continuing Operations Before Income Tax (Detail) link:calculationLink link:presentationLink link:definitionLink 1102 - Disclosure - Provision for Income Taxes (Detail) link:calculationLink link:presentationLink link:definitionLink 1103 - Disclosure - Income Taxes - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1104 - Disclosure - Reconciliation of Differences Between the Statutory Tax Rate and the Effective Income Tax Rate (Detail) link:calculationLink link:presentationLink link:definitionLink 1105 - Disclosure - Aggregate Dollar and Per Share Effects of Tax Holidays (Detail) link:calculationLink link:presentationLink link:definitionLink 1106 - Disclosure - Significant Components of Deferred Tax Assets and Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1107 - Disclosure - Net Changes in the Total Valuation Allowance for Deferred Tax Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1108 - Disclosure - Net Deferred Tax Assets Included in the Consolidated Balance Sheets (Detail) link:calculationLink link:presentationLink link:definitionLink 1109 - Disclosure - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) link:calculationLink link:presentationLink link:definitionLink 1110 - Disclosure - Reconciliation of Differences Between Basic and Diluted Income Attributable to Nidec Corporation Per Share (Detail) link:calculationLink link:presentationLink link:definitionLink 1111 - Disclosure - Contracted Amounts Outstanding of Derivative Instruments (Detail) link:calculationLink link:presentationLink link:definitionLink 1112 - Disclosure - Fair Value of Derivative Instruments (Detail) link:calculationLink link:presentationLink link:definitionLink 1113 - Disclosure - Effect of Derivative Instruments on the Consolidated Statements of Income (Detail) link:calculationLink link:presentationLink link:definitionLink 1114 - Disclosure - Derivatives - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1115 - Disclosure - Assets and Liabilities that are Measured at Fair Value on a Recurring Basis (Detail) link:calculationLink link:presentationLink link:definitionLink 1116 - Disclosure - Estimated Fair Values of Financial Instruments (Detail) link:calculationLink link:presentationLink link:definitionLink 1117 - Disclosure - Related Party Transactions - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1118 - Disclosure - Leased Assets Under Capital Leases (Detail) link:calculationLink link:presentationLink link:definitionLink 1119 - Disclosure - Lease Commitments - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1120 - Disclosure - Future Minimum Lease Payments Under Capital Leases Together with Present Value of Net Minimum Lease Payments (Detail) link:calculationLink link:presentationLink link:definitionLink 1121 - Disclosure - 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 (Detail) link:calculationLink link:presentationLink link:definitionLink 1122 - Disclosure - Future Minimum Lease Payments to be Received Under Operating Leases that have Remaining Non-Cancelable Terms (Detail) link:calculationLink link:presentationLink link:definitionLink 1123 - Disclosure - Flooding in Thailand - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1124 - Disclosure - Other Commitments and Contingencies, Concentrations and Factors that May Affect Future Operations - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1125 - Disclosure - Changes in Product Warranty Liabilities (Detail) link:calculationLink link:presentationLink link:definitionLink 1126 - Disclosure - Discontinued Operations - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1127 - Disclosure - Operating Results of Discontinued Operations (Detail) link:calculationLink link:presentationLink link:definitionLink 1128 - Disclosure - Product Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1129 - Disclosure - Revenues from External Customers and Long-Lived Assets (Detail) link:calculationLink link:presentationLink link:definitionLink 1130 - Disclosure - Net Sales to External Customers and Other Financial Information by Operating Segments (Detail) link:calculationLink link:presentationLink link:definitionLink 1131 - Disclosure - Segment Information - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1132 - Disclosure - Subsequent Events - Additional Information (Detail) link:calculationLink link:presentationLink link:definitionLink 1133 - Disclosure - Quarterly Financial Data (Unaudited) (Detail) link:calculationLink link:presentationLink link:definitionLink