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Reconciliation of Financial Assets Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Detail) (JPY ¥) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Ending Balance | ¥ 92,804 |  | ¥ 144,877 |  |  |
Available-for-sale securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 136,978 |  | 243,655 |  | 315,676 |
Gains or losses (realized/ unrealized), included in earnings | 4,364 | [1] | (9,225) | [1] | (1,262) | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 4,056 | [2] | 7,693 | [2] | 1,443 | [2]
Gains or losses (realized/ unrealized), total | 8,420 |  | (1,532) |  | 181 |
Purchases | 56,202 |  | 19,294 |  | 63,980 |
Sales | (13,817) |  | (10,564) |  | (18,054) |
Settlements | (103,782) |  | (113,875) |  | (118,596) |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 468 | [3]
Ending Balance | 84,001 |  | 136,978 |  | 243,655 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 180 | [1] | (9,783) | [1] | (2,429) | [1]
Available-for-sale securities | Corporate debt securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 6,524 |  | 2,912 |  | 2,573 |
Gains or losses (realized/ unrealized), included in earnings | 416 | [1] | (508) | [1] | (18) | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | (356) | [2] | 908 | [2] | 108 | [2]
Gains or losses (realized/ unrealized), total | 60 |  | 400 |  | 90 |
Purchases | 0 |  | 3,942 |  | 2,549 |
Sales | (1,325) |  | (432) |  | (431) |
Settlements | (4,598) |  | (298) |  | (2,337) |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 468 | [3]
Ending Balance | 661 |  | 6,524 |  | 2,912 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 0 | [1] | (456) | [1] | (35) | [1]
Available-for-sale securities | Specified bonds issued by SPEs in Japan |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 63,244 |  | 139,152 |  | 222,314 |
Gains or losses (realized/ unrealized), included in earnings | 327 | [1] | (9,228) | [1] | (3,066) | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 839 | [2] | (15) | [2] | 2,178 | [2]
Gains or losses (realized/ unrealized), total | 1,166 |  | (9,243) |  | (888) |
Purchases | 0 |  | 5,419 |  | 6,668 |
Sales | (36) |  | (9) |  | (9,625) |
Settlements | (57,602) |  | (72,075) |  | (79,317) |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 0 | [3]
Ending Balance | 6,772 |  | 63,244 |  | 139,152 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 5 | [1] | (8,095) | [1] | (3,397) | [1]
Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 58,899 |  | 93,181 |  | 85,283 |
Gains or losses (realized/ unrealized), included in earnings | 3,621 | [1] | (369) | [1] | 1,822 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 1,334 | [2] | 5,381 | [2] | (1,056) | [2]
Gains or losses (realized/ unrealized), total | 4,955 |  | 5,012 |  | 766 |
Purchases | 55,202 |  | 9,933 |  | 49,072 |
Sales | (12,456) |  | (7,725) |  | (7,998) |
Settlements | (41,582) |  | (41,502) |  | (33,942) |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 0 | [3]
Ending Balance | 65,018 |  | 58,899 |  | 93,181 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 175 | [1] | (1,232) | [1] | 1,003 | [1]
Available-for-sale securities | Other Debt Securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 8,311 |  | 8,410 |  | 5,506 |
Gains or losses (realized/ unrealized), included in earnings | 0 | [1] | 880 | [1] | 0 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 2,239 | [2] | 1,419 | [2] | 213 | [2]
Gains or losses (realized/ unrealized), total | 2,239 |  | 2,299 |  | 213 |
Purchases | 1,000 |  | 0 |  | 5,691 |
Sales | 0 |  | (2,398) |  | 0 |
Settlements | 0 |  | 0 |  | (3,000) |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 0 | [3]
Ending Balance | 11,550 |  | 8,311 |  | 8,410 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 0 | [1] | 0 | [1] | 0 | [1]
Derivative Financial Instruments, Assets and Liabilities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 2,099 |  | 5,293 |  | 2,946 |
Gains or losses (realized/ unrealized), included in earnings | 2,987 | [1] | (3,194) | [1] | 2,159 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 0 | [2] | 0 | [2] | 0 | [2]
Gains or losses (realized/ unrealized), total | 2,987 |  | (3,194) |  | 2,159 |
Purchases | 0 |  | 0 |  | 0 |
Sales | 0 |  | 0 |  | 0 |
Settlements | (2,600) |  | 0 |  | 188 |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 0 | [3]
Ending Balance | 2,486 |  | 2,099 |  | 5,293 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 2,987 | [1] | (3,194) | [1] | 2,159 | [1]
Derivative Financial Instruments, Assets and Liabilities | Options Held (Written) and Other |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 2,099 |  | 5,293 |  | 3,134 |
Gains or losses (realized/ unrealized), included in earnings | 2,987 | [1] | (3,194) | [1] | 2,159 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income | 0 | [2] | 0 | [2] | 0 | [2]
Gains or losses (realized/ unrealized), total | 2,987 |  | (3,194) |  | 2,159 |
Purchases | 0 |  | 0 |  | 0 |
Sales | 0 |  | 0 |  | 0 |
Settlements | (2,600) |  | 0 |  | 0 |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] | 0 | [3]
Ending Balance | 2,486 |  | 2,099 |  | 5,293 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 2,987 | [1] | (3,194) | [1] | 2,159 | [1]
Derivative Financial Instruments, Assets and Liabilities | Credit derivatives held/written |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance |  |  |  |  | (188) |
Gains or losses (realized/ unrealized), included in earnings |  |  |  |  | 0 | [1]
Gains or losses (realized/ unrealized), included in other comprehensive income |  |  |  |  | 0 | [2]
Gains or losses (realized/ unrealized), total |  |  |  |  | 0 |
Purchases |  |  |  |  | 0 |
Sales |  |  |  |  | 0 |
Settlements |  |  |  |  | 188 |
Transfers in and/or out of Level 3 (net) |  |  |  |  | 0 | [3]
Ending Balance |  |  |  |  | 0 |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period |  |  |  |  | 0 | [1]
Other securities |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 5,800 |  | 0 |  |  |
Gains or losses (realized/ unrealized), included in earnings | 1,767 | [1] | 670 | [1] |  |
Gains or losses (realized/ unrealized), included in other comprehensive income | 584 | [2] | 825 | [2] |  |
Gains or losses (realized/ unrealized), total | 2,351 |  | 1,495 |  |  |
Purchases | 2,013 |  | 5,018 |  |  |
Sales | (3,824) |  | (713) |  |  |
Settlements | (23) |  | 0 |  |  |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] |  |
Ending Balance | 6,317 |  | 5,800 |  |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 1,767 | [1] | 670 | [1] |  |
Other securities | Investment funds |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 5,800 |  | 0 |  |  |
Gains or losses (realized/ unrealized), included in earnings | 1,767 | [1] | 670 | [1] |  |
Gains or losses (realized/ unrealized), included in other comprehensive income | 584 | [2] | 825 | [2] |  |
Gains or losses (realized/ unrealized), total | 2,351 |  | 1,495 |  |  |
Purchases | 2,013 |  | 5,018 |  |  |
Sales | (3,824) |  | (713) |  |  |
Settlements | (23) |  | 0 |  |  |
Transfers in and/or out of Level 3 (net) | 0 | [3] | 0 | [3] |  |
Ending Balance | 6,317 |  | 5,800 |  |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 1,767 | [1] | 670 | [1] |  |
Accounts Payable |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 0 |  |  |  |  |
Gains or losses (realized/ unrealized), included in earnings | 2,343 | [1] |  |  |  |
Gains or losses (realized/ unrealized), included in other comprehensive income | 0 | [2] |  |  |  |
Gains or losses (realized/ unrealized), total | 2,343 |  |  |  |  |
Purchases | 5,176 |  |  |  |  |
Sales | 0 |  |  |  |  |
Settlements | 0 |  |  |  |  |
Transfers in and/or out of Level 3 (net) | 0 | [3] |  |  |  |
Ending Balance | 2,833 |  |  |  |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | 2,343 | [1] |  |  |  |
Accounts Payable | Contingent consideration |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Beginning Balance | 0 |  |  |  |  |
Gains or losses (realized/ unrealized), included in earnings | 2,343 | [1] |  |  |  |
Gains or losses (realized/ unrealized), included in other comprehensive income | 0 | [2] |  |  |  |
Gains or losses (realized/ unrealized), total | 2,343 |  |  |  |  |
Purchases | 5,176 |  |  |  |  |
Sales | 0 |  |  |  |  |
Settlements | 0 |  |  |  |  |
Transfers in and/or out of Level 3 (net) | 0 | [3] |  |  |  |
Ending Balance | 2,833 |  |  |  |  |
Change in unrealized gains or losses included in earnings for assets and liabilities still held at the end of period | ¥ 2,343 | [1] |  |  |  |
[1] | Principally, gains and losses from available-for-sale securities are included in "brokerage commissions and net gains on investment securities", "write-downs of securities" or "life insurance premiums and related investment income"; other securities are included in "brokerage commissions and net gains on investment securities" and derivative assets and liabilities (net) are included in "other operating revenues/expenses," and gains from accounts payable are included in "other operating revenues". Also, for available-for-sale securities, amortization of interest recognized in interest on loans and investment securities is included in these columns.
[2] | Unrealized gains and losses from available-for-sale securities are included in "Net change of unrealized gains (losses) on investment in securities."
[3] | The amount reported in "Transfers in and/or out of Level 3 (net)" is the fair value at the beginning of quarter during which the transfers occur.

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- Definition Amount of gain (loss) recognized in the income statement for 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)(1) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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