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Pension Plans - Additional Information (Detail) (JPY ¥) In Millions, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated portions of net prior service credit that will be recognized as a component of net pension cost |  | ¥ (924) |  |
Estimated portions of net actuarial loss that will be recognized as a component of net pension cost |  | 547 |  |
Estimated portions of net transition obligation that will be recognized as a component of net pension |  | 53 |  |
Accumulated benefit obligations for all defined benefit pension plans | 71,863 | 71,863 | 56,864 |
Aggregate projected benefit obligations for plans with accumulated benefit obligations in excess of plan assets | 19,924 | 19,924 | 4,006 |
Aggregate accumulated benefit obligations for plans with accumulated benefit obligations in excess of plan assets | 17,487 | 17,487 | 3,738 |
Aggregate fair values of plan assets for the plans with accumulated benefit obligations in excess of plan assets | 7,015 | 7,015 | 1,034 |
Expected pension plans contributions by Company and certain subsidiaries |  | 2,976 |  |
Cost recognized for defined contribution pension plans of Company and certain of its subsidiaries |  | 1,023 | 926 | 816
Overseas Pension Plans Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Estimated portions of net prior service credit that will be recognized as a component of net pension cost | (3) |  |  |
Estimated portions of net actuarial loss that will be recognized as a component of net pension cost | 60 |  |  |
Estimated portions of net transition obligation that will be recognized as a component of net pension | 3 |  |  |
Accumulated benefit obligations for all defined benefit pension plans | 61,730 | 61,730 | 5,128 |
Aggregate projected benefit obligations for plans with accumulated benefit obligations in excess of plan assets | 5,555 | 5,555 | 5,335 |
Aggregate accumulated benefit obligations for plans with accumulated benefit obligations in excess of plan assets | 5,372 | 5,372 | 5,016 |
Aggregate fair values of plan assets for the plans with accumulated benefit obligations in excess of plan assets | 4,096 | 4,096 | 3,799 |
Expected pension plans contributions by Company and certain subsidiaries |  | 11,191 |  |
Cost recognized for defined contribution pension plans of Company and certain of its subsidiaries |  | ¥ 1,560 | ¥ 574 | ¥ 593
Equity securities | Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans | 30.00% | 30.00% | 30.00% |
Equity securities | Overseas Pension Plans Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans | 40.00% | 40.00% |  |
Debt Securities | Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans | 40.00% | 40.00% | 40.00% |
Debt Securities | Overseas Pension Plans Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans | 60.00% | 60.00% | 90.00% |
Other investment | Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans | 30.00% | 30.00% | 30.00% |
Other investment | Overseas Pension Plans Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Portfolio of plans |  |  | 10.00% |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to transition obligation (asset) expected to be recognized as components of net periodic benefit cost (credit) for the fiscal year that follows the most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=32704760&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2417-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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