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Information about Valuation Techniques and Significant Unobservable Inputs Used in Valuation of Level Three Assets Measured at Fair Value on Recurring Basis (Detail) (JPY ¥) In Millions, unless otherwise specified |  |  | 12 Months Ended |  |  |  |  | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2014 Contingent consideration Monte Carlo Simulation Valuation Technique | Mar. 31, 2014 Available-for-sale securities | Mar. 31, 2013 Available-for-sale securities | Mar. 31, 2012 Available-for-sale securities | Mar. 31, 2011 Available-for-sale securities | Mar. 31, 2013 Available-for-sale securities Corporate debt securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Available-for-sale securities Corporate debt securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2013 Available-for-sale securities Corporate debt securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2014 Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Available-for-sale securities Specified bonds issued by SPEs in Japan Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2013 Available-for-sale securities Specified bonds issued by SPEs in Japan Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2014 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2013 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2014 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2013 Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2014 Available-for-sale securities Other Debt Securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Available-for-sale securities Other Debt Securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Other securities | Mar. 31, 2013 Other securities | Mar. 31, 2012 Other securities | Mar. 31, 2013 Other securities Investment funds Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Other securities Investment funds Internal Cash Flows Valuation Technique | Mar. 31, 2014 Derivative assets Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Derivative assets Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Minimum Contingent consideration Monte Carlo Simulation Valuation Technique | Mar. 31, 2014 Minimum Available-for-sale securities Corporate debt securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2014 Minimum Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Minimum Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Minimum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2013 Minimum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2014 Minimum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Minimum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Minimum Available-for-sale securities Other Debt Securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Minimum Other securities Investment funds Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Minimum Other securities Investment funds Internal Cash Flows Valuation Technique | Mar. 31, 2014 Minimum Derivative assets Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Minimum Derivative assets Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Contingent consideration Monte Carlo Simulation Valuation Technique | Mar. 31, 2013 Maximum Available-for-sale securities Corporate debt securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Available-for-sale securities Corporate debt securities Appraisals/Broker Quotes Valuation Technique | Mar. 31, 2014 Maximum Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Maximum Available-for-sale securities Specified bonds issued by SPEs in Japan Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2013 Maximum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities | Mar. 31, 2014 Maximum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Maximum Available-for-sale securities CMBS and RMBS in the U.S., and other asset-backed securities Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Available-for-sale securities Other Debt Securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Maximum Available-for-sale securities Other Debt Securities Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Maximum Other securities Investment funds Discounted Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Other securities Investment funds Internal Cash Flows Valuation Technique | Mar. 31, 2014 Maximum Derivative assets Discounted Cash Flows Valuation Technique | Mar. 31, 2013 Maximum Derivative assets Discounted Cash Flows Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value | ¥ 92,804 | ¥ 144,877 | ¥ 2,833 | ¥ 84,001 | ¥ 136,978 | ¥ 243,655 | ¥ 315,676 | ¥ 974 | ¥ 661 | ¥ 5,550 | ¥ 3,627 | ¥ 60,013 | ¥ 3,145 | ¥ 3,231 |  |  | ¥ 22,991 | ¥ 30,804 | ¥ 42,027 | ¥ 28,095 | ¥ 11,550 | ¥ 8,311 | ¥ 6,317 | ¥ 5,800 | ¥ 0 | ¥ 5,800 | ¥ 6,317 | ¥ 2,486 | ¥ 2,099 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Technique(s) |  |  | Monte Carlo simulation |  |  |  |  | Discounted cash flows | Appraisals/Broker quotes | Appraisals/Broker quotes | Discounted cash flows | Discounted cash flows | Appraisals/Broker quotes | Appraisals/Broker quotes |  |  | Discounted cash flows | Discounted cash flows | Appraisals/Broker quotes | Appraisals/Broker quotes | Discounted cash flows | Discounted cash flows |  |  |  | Discounted cash flows | Internal cash flows | Discounted cash flows | Discounted cash flows |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Unobservable Inputs |  |  | Discount rate |  |  |  |  | Discount rate | - | - | Discount rate | Discount rate | - | - | Probability of default | Probability of default | Discount rate | Discount rate | - | - | Discount rate | Discount rate |  |  |  | Discount rate | Discount rate | Discount rate | Discount rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Discount Rate |  |  | 16.00% |  |  |  |  | 5.40% |  |  | 4.50% | 4.90% |  |  |  |  | 18.10% | 9.30% |  |  | 12.00% | 11.70% |  |  |  | 18.60% | 20.10% | 11.50% | 12.30% | 16.00% | 0.00% | 1.00% | 1.00% |  |  | 4.10% | 2.90% | 12.00% | 13.00% | 15.00% | 10.00% | 10.00% | 16.00% | 5.40% | 0.00% | 11.10% | 12.00% |  |  | 38.00% | 42.60% | 12.00% | 11.70% | 20.00% | 32.00% | 15.00% | 15.00%
Weighted Average Probability of default |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.60% | 1.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  | 18.10% | 12.80% |  |  |  |  |  |  |  |

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- Definition Fair Value Assets Measured On Recurring Basis Significant Unobservable Inputs + References No definition available. + Details
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- Definition Financial Instruments Fair Value Assumptions, Weighted Average Credit Default Rates + References No definition available. + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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