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Recorded Amounts of Major Assets Measured at Fair Value on Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis ¥ 118,768 ¥ 98,073
Real Estate Collateral Dependent Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 39,866 60,564
Investment in Operating Leases and Other Operating Assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 60,665 21,960
Land And Buildings Undeveloped Or Under Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 18,237 11,845
Certain investment in affiliates
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis   3,704
Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 1 | Real Estate Collateral Dependent Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 1 | Investment in Operating Leases and Other Operating Assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 1 | Land And Buildings Undeveloped Or Under Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 1 | Certain investment in affiliates
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis   0
Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 2 | Real Estate Collateral Dependent Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 2 | Investment in Operating Leases and Other Operating Assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 2 | Land And Buildings Undeveloped Or Under Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 0 0
Level 2 | Certain investment in affiliates
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis   0
Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 118,768 98,073
Level 3 | Real Estate Collateral Dependent Loans
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 39,866 60,564
Level 3 | Investment in Operating Leases and Other Operating Assets
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 60,665 21,960
Level 3 | Land And Buildings Undeveloped Or Under Construction
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis 18,237 11,845
Level 3 | Certain investment in affiliates
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at fair value on a nonrecurring basis   ¥ 3,704