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Information about Impaired Loans (Detail) (JPY ¥)
In Millions, unless otherwise specified
 9 Months Ended 12 Months Ended
Dec. 31, 2011
Mar. 31, 2011
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment ¥ 281,957 ¥ 312,031
Unpaid Principal Balance 280,324 311,026
Related Allowance 85,721 97,323
Corporate loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 241,505 267,034
Unpaid Principal Balance 239,904 266,030
Related Allowance 66,203 78,293
Corporate Non-recourse loans | Japan
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 31,546 21,418
Unpaid Principal Balance 31,513 21,338
Related Allowance 4,636 4,421
Corporate Non-recourse loans | U.S.
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 35,060 51,611
Unpaid Principal Balance 34,952 51,365
Related Allowance 13,781 18,702
Other Real estate companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 80,489 93,607
Unpaid Principal Balance 79,986 93,324
Related Allowance 25,910 30,552
Other Entertainment companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 23,564 29,597
Unpaid Principal Balance 23,164 29,517
Related Allowance 3,261 4,114
All other
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 70,846 70,801
Unpaid Principal Balance 70,289 70,486
Related Allowance 18,615 20,504
Purchased loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 31,522 36,685
Unpaid Principal Balance 31,522 36,685
Related Allowance 16,668 16,014
Consumer Loan
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 8,930 8,312
Unpaid Principal Balance 8,898 8,311
Related Allowance 2,850 3,016
Impaired Financing Receivable with No Related Allowance
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 80,416 [1] 68,282 [1]
Unpaid Principal Balance 79,925 [1] 68,183 [1]
Impaired Financing Receivable with No Related Allowance | Consumer Housing loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 1,872 2,259
Unpaid Principal Balance 1,853 2,259
Impaired Financing Receivable with No Related Allowance | Corporate loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 78,544 66,023
Unpaid Principal Balance 78,072 65,924
Impaired Financing Receivable with No Related Allowance | Corporate Non-recourse loans | Japan
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 19,036 9,465
Unpaid Principal Balance 19,023 9,443
Impaired Financing Receivable with No Related Allowance | Corporate Non-recourse loans | U.S.
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 4,337 4,579
Unpaid Principal Balance 4,337 4,579
Impaired Financing Receivable with No Related Allowance | Other Real estate companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 15,362 14,532
Unpaid Principal Balance 15,326 14,516
Impaired Financing Receivable with No Related Allowance | Other Entertainment companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 12,504 17,080
Unpaid Principal Balance 12,326 17,031
Impaired Financing Receivable with No Related Allowance | All other
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 27,305 20,367
Unpaid Principal Balance 27,060 20,355
Impaired Financing Receivable with Related Allowance
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 201,541 [2] 243,749 [2]
Unpaid Principal Balance 200,399 [2] 242,843 [2]
Related Allowance 85,721 [2] 97,323 [2]
Impaired Financing Receivable with Related Allowance | Consumer Housing loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 7,058 6,053
Unpaid Principal Balance 7,045 6,052
Related Allowance 2,850 3,016
Impaired Financing Receivable with Related Allowance | Corporate loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 162,961 201,011
Unpaid Principal Balance 161,832 200,106
Related Allowance 66,203 78,293
Impaired Financing Receivable with Related Allowance | Corporate Non-recourse loans | Japan
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 12,510 11,953
Unpaid Principal Balance 12,490 11,895
Related Allowance 4,636 4,421
Impaired Financing Receivable with Related Allowance | Corporate Non-recourse loans | U.S.
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 30,723 47,032
Unpaid Principal Balance 30,615 46,786
Related Allowance 13,781 18,702
Impaired Financing Receivable with Related Allowance | Other Real estate companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 65,127 79,075
Unpaid Principal Balance 64,660 78,808
Related Allowance 25,910 30,552
Impaired Financing Receivable with Related Allowance | Other Entertainment companies
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 11,060 12,517
Unpaid Principal Balance 10,838 12,486
Related Allowance 3,261 4,114
Impaired Financing Receivable with Related Allowance | All other
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 43,541 50,434
Unpaid Principal Balance 43,229 50,131
Related Allowance 18,615 20,504
Impaired Financing Receivable with Related Allowance | Purchased loans
    
Financing Receivable, Impaired [Line Items]    
Loans Individually Evaluated for Impairment 31,522 36,685
Unpaid Principal Balance 31,522 36,685
Related Allowance ¥ 16,668 ¥ 16,014
[1] "With no related allowance recorded" represents impaired loans with no allowance for credit losses as all amounts due are considered to be collectible.
[2] "With an allowance recorded" represents impaired loans with the allowance for credit losses as all amounts due or a part of the amounts due are not considered to be collectible.