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Information about Credit Quality Indicators (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable ¥ 3,395,361 ¥ 3,662,612 ¥ 3,650,639
Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,236,414 1,171,142 881,483
Consumer Housing loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 979,797 916,791  
Consumer-Card loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 228,868 225,707  
Consumer - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 27,749 28,644  
Corporate Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,011,533 1,431,289  
Non-recourse Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 174,204 568,957 775,465
Non-recourse Loans | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 72,625 134,440  
Non-recourse Loans | United States
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 101,579 434,517  
Real estate companies
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 245,965 276,681  
Other-Entertainment industry
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 106,884 121,259  
Other - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 484,480 464,392  
Purchased loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 53,341 [1] 70,801 [1] 97,559 [1]
Direct Financing Leases
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,094,073 989,380 900,886
Direct Financing Leases | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 761,437 692,585  
Direct Financing Leases | Overseas
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 332,636 296,795  
Performing
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 3,239,501 3,426,321  
Performing | Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,218,469 1,152,536  
Performing | Consumer Housing loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 968,269 901,895  
Performing | Consumer-Card loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 225,198 223,130  
Performing | Consumer - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 25,002 27,511  
Performing | Corporate Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 910,580 1,258,517  
Performing | Non-recourse Loans | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 64,757 111,025  
Performing | Non-recourse Loans | United States
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 84,545 396,882  
Performing | Real estate companies
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 217,096 229,555  
Performing | Other-Entertainment industry
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 99,057 109,222  
Performing | Other - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 445,125 411,833  
Performing | Purchased loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 30,266 41,694  
Performing | Direct Financing Leases
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,080,186 973,574  
Performing | Direct Financing Leases | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 751,877 680,351  
Performing | Direct Financing Leases | Overseas
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 328,309 293,223  
Nonperforming Financing Receivable Individually Evaluated for Impairment
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 135,824 212,740  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 11,796 10,861  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Consumer Housing loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 7,317 8,499  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Consumer-Card loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 2,950 1,858  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Consumer - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,529 504  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Corporate Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 100,953 172,772  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Non-recourse Loans | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 7,868 23,415  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Non-recourse Loans | United States
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 17,034 37,635  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Real estate companies
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 28,869 47,126  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Other-Entertainment industry
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 7,827 12,037  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Other - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 39,355 52,559  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Purchased loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 23,075 29,107  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Direct Financing Leases
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Direct Financing Leases | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable Individually Evaluated for Impairment | Direct Financing Leases | Overseas
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 20,036 23,551  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 6,149 7,745  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Consumer Housing loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 4,211 6,397  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Consumer-Card loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 720 719  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Consumer - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 1,218 629  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Corporate Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Non-recourse Loans | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Non-recourse Loans | United States
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Real estate companies
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Other-Entertainment industry
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Other - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Purchased loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 0 0  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Direct Financing Leases
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 13,887 15,806  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Direct Financing Leases | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 9,560 12,234  
Nonperforming Financing Receivable more than 90 days Past Due Not Individually Evaluated for Impairment | Direct Financing Leases | Overseas
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 4,327 3,572  
Nonperforming
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 155,860 236,291  
Nonperforming | Consumer Loan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 17,945 18,606  
Nonperforming | Consumer Housing loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 11,528 14,896  
Nonperforming | Consumer-Card loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 3,670 2,577  
Nonperforming | Consumer - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 2,747 1,133  
Nonperforming | Corporate Loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 100,953 172,772  
Nonperforming | Non-recourse Loans | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 7,868 23,415  
Nonperforming | Non-recourse Loans | United States
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 17,034 37,635  
Nonperforming | Real estate companies
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 28,869 47,126  
Nonperforming | Other-Entertainment industry
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 7,827 12,037  
Nonperforming | Other - Other
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 39,355 52,559  
Nonperforming | Purchased loans
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 23,075 29,107  
Nonperforming | Direct Financing Leases
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 13,887 15,806  
Nonperforming | Direct Financing Leases | Japan
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable 9,560 12,234  
Nonperforming | Direct Financing Leases | Overseas
     
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable ¥ 4,327 ¥ 3,572  
[1] Purchased loans represent loans with evidence of deterioration of credit quality since origination and for which it is probable at acquisition that collection of all contractually required payments from the debtors is unlikely in accordance with ASC 310-30 ("Receivables-Loans and Debt Securities Acquired with Deteriorated Credit Quality").