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Recorded Amounts of Major Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments ¥ 11,433 ¥ 5,800
Derivative assets 12,452 14,598
Derivative liabilities 16,646 18,037
Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 5,116  
Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,317 5,800
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 12,437 14,598
Financial assets 929,070 826,764
Derivative liabilities 16,646 18,037
Financial liabilities 19,478 18,037
Accounts Payable 2,833  
Fair Value, Measurements, Recurring | Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 2,528 4,654
Derivative liabilities 634 1,459
Fair Value, Measurements, Recurring | Options Held (Written) and Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 5,486 5,654
Derivative liabilities 3,605 3,530
Fair Value, Measurements, Recurring | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 860 1,030
Derivative liabilities 4,966 4,685
Fair Value, Measurements, Recurring | Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 3,534 2,890
Derivative liabilities 7,176 8,263
Fair Value, Measurements, Recurring | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 29 370
Derivative liabilities 265 100
Fair Value, Measurements, Recurring | Contingent consideration
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Accounts Payable 2,833  
Fair Value, Measurements, Recurring | Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 12,631 [1] 16,026 [1]
Fair Value, Measurements, Recurring | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 16,079 33,041
Fair Value, Measurements, Recurring | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 881,606 757,299
Fair Value, Measurements, Recurring | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 360,360 278,717
Fair Value, Measurements, Recurring | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 96,697 61,090
Fair Value, Measurements, Recurring | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 201,386 196,835
Fair Value, Measurements, Recurring | Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,772 63,244
Fair Value, Measurements, Recurring | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 65,631 60,691
Fair Value, Measurements, Recurring | Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 11,550 8,311
Fair Value, Measurements, Recurring | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 139,210 [2] 88,411
Fair Value, Measurements, Recurring | Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,317 5,800
Fair Value, Measurements, Recurring | Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,317 [3] 5,800 [3]
Fair Value, Measurements, Recurring | Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 8 147
Financial assets 230,901 168,729
Derivative liabilities 28 0
Financial liabilities 28 0
Accounts Payable 0  
Fair Value, Measurements, Recurring | Level 1 | Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Options Held (Written) and Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 8 147
Derivative liabilities 28 0
Fair Value, Measurements, Recurring | Level 1 | Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Contingent consideration
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Accounts Payable 0  
Fair Value, Measurements, Recurring | Level 1 | Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 1 | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 275 2,184
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 230,618 166,398
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 114,989 98,990
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 115,629 [2] 67,408
Fair Value, Measurements, Recurring | Level 1 | Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 1 | Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 [3] 0 [3]
Fair Value, Measurements, Recurring | Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 9,943 12,352
Financial assets 605,365 513,158
Derivative liabilities 16,618 18,037
Financial liabilities 16,617 18,037
Accounts Payable 0  
Fair Value, Measurements, Recurring | Level 2 | Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 2,528 4,654
Derivative liabilities 634 1,459
Fair Value, Measurements, Recurring | Level 2 | Options Held (Written) and Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 3,000 3,555
Derivative liabilities 3,605 3,530
Fair Value, Measurements, Recurring | Level 2 | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 852 883
Derivative liabilities 4,938 4,685
Fair Value, Measurements, Recurring | Level 2 | Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 3,534 2,890
Derivative liabilities 7,176 8,263
Fair Value, Measurements, Recurring | Level 2 | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 29 370
Derivative liabilities 265 100
Fair Value, Measurements, Recurring | Level 2 | Contingent consideration
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Accounts Payable 0  
Fair Value, Measurements, Recurring | Level 2 | Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 12,631 [1] 16,026 [1]
Fair Value, Measurements, Recurring | Level 2 | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 15,804 30,857
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 566,987 453,923
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 245,371 179,727
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 96,697 61,090
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 200,725 190,311
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 613 1,792
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 2 | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 23,581 [2] 21,003
Fair Value, Measurements, Recurring | Level 2 | Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 2 | Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 [3] 0 [3]
Fair Value, Measurements, Recurring | Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 2,486 2,099
Financial assets 92,804 144,847
Derivative liabilities 0 0
Financial liabilities 2,833 0
Accounts Payable 2,833  
Fair Value, Measurements, Recurring | Level 3 | Interest rate swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Options Held (Written) and Other
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 2,486 2,099
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Futures, Foreign exchange contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign currency swap agreements
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Credit derivatives held/written
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 3 | Contingent consideration
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Accounts Payable 2,833  
Fair Value, Measurements, Recurring | Level 3 | Loans Held-for-Sale
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 [1] 0 [1]
Fair Value, Measurements, Recurring | Level 3 | Trading securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 84,001 136,978
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Japanese and foreign government bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Japanese prefectural and foreign municipal bond securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 0
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Corporate debt securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 661 6,524
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Specified bonds issued by SPEs in Japan
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,772 63,244
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | CMBS and RMBS in the U.S., and other asset-backed securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 65,018 58,899
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Other Debt Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 11,550 8,311
Fair Value, Measurements, Recurring | Level 3 | Available-for-sale securities | Equity securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 0 [2] 0
Fair Value, Measurements, Recurring | Level 3 | Other securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments 6,317 5,800
Fair Value, Measurements, Recurring | Level 3 | Other securities | Investment funds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Fair value measured on recurring basis investments ¥ 6,317 [3] ¥ 5,800 [3]
[1] A subsidiary elected the fair value option under ASC 825 ("Financial Instruments") on the loans held for sale originated on or after October 1, 2011. These loans are multi-family and seniors housing loans and are sold to Federal National Mortgage Association ("Fannie Mae") or institutional investors. Included in other operating revenues in the consolidated statements of income were gains from the change in the fair value of the loans of ¥1,024 million for the fiscal year ended March 31, 2012, losses from the change in the fair value of the loans of ¥628 million for the fiscal year ended March 31, 2013 and gains from the change in the fair value of the loans of ¥116 million for the fiscal year ended March 31, 2014. No gains or losses were recognized in earnings during the fiscal year ended March 31, 2012, the fiscal year ended March 31, 2013 and the fiscal year ended March 31, 2014 attributable to changes in instrument-specific credit risk. The amounts of aggregate unpaid principal balance and aggregate fair value at March 31, 2013, were ¥15,535 million and ¥16,026 million, respectively, and the amount of the aggregate fair value exceeded the amount of aggregate unpaid principal balance by ¥491 million. The amounts of aggregate unpaid principal balance and aggregate fair value at March 31, 2014, were ¥12,024 million and ¥12,631 million, respectively, and the amount of the aggregate fair value exceeded the amount of aggregate unpaid principal balance by ¥607 million. As of March 31, 2013 and 2014, there were no loans that were 90 days or more past due, in non-accrual status, or both.
[2] A subsidiary that has newly become a consolidated subsidiary of the Company during this fiscal year elected the fair value option under ASC 825 ("Financial Instruments") for investments in equity securities included in available-for-sale securities. Included in brokerage commissions and net gains on investment securities in the consolidated statements of income were gains from the change in the fair value of those investments of ¥333 million for the fiscal year ended March 31, 2014. The amount of aggregate fair value elected the fair value option is ¥5,116 million as of March 31, 2014.
[3] A subsidiary and another company that have newly become a consolidated subsidiary of the Company during this fiscal year elected the fair value option under ASC 825 ("Financial Instruments") for investments in some funds. Included in brokerage commissions and net gains on investment securities in the consolidated statements of income were gains from the change in the fair value of those investments of ¥670 million for the fiscal year ended March 31, 2013 and ¥1,412 million for the fiscal year ended March 31, 2014. The amounts of aggregate fair value elected the fair value option were ¥5,800 million and ¥6,317 million as of March 31, 2013 and 2014, respectively.