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Information about Impaired Loans (Detail) (JPY ¥)
In Millions, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment ¥ 135,824 ¥ 212,740 ¥ 293,774
Unpaid Principal Balance 135,089 211,566  
Related Allowance 49,155 65,151 91,407
Consumer Loan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 11,796 10,861 9,021
Unpaid Principal Balance 11,721 10,817  
Related Allowance 3,279 3,190 3,002
Consumer Housing loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 7,317 8,499  
Unpaid Principal Balance 7,254 8,460  
Related Allowance 2,432 2,565  
Consumer-Card loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 2,950 1,858  
Unpaid Principal Balance 2,942 1,854  
Related Allowance 629 547  
Consumer - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 1,529 504  
Unpaid Principal Balance 1,525 503  
Related Allowance 218 78  
Corporate Loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 100,953 172,772  
Unpaid Principal Balance 100,293 171,642  
Related Allowance 33,588 48,826  
Non-recourse Loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 24,902 61,050 82,957
Related Allowance 8,534 14,620 20,657
Non-recourse Loans | Japan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 7,868 23,415  
Unpaid Principal Balance 7,804 23,411  
Related Allowance 1,020 1,021  
Non-recourse Loans | United States
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 17,034 37,635  
Unpaid Principal Balance 17,005 37,531  
Related Allowance 7,514 13,599  
Real estate companies
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 28,869 47,126  
Unpaid Principal Balance 28,813 46,956  
Related Allowance 8,911 15,862  
Other-Entertainment industry
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 7,827 12,037  
Unpaid Principal Balance 7,785 11,990  
Related Allowance 1,801 2,118  
Other - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 39,355 52,559  
Unpaid Principal Balance 38,886 51,754  
Related Allowance 14,342 16,226  
Purchased loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 23,075 [1] 29,107 [1] 34,907 [1]
Unpaid Principal Balance 23,075 29,107  
Related Allowance 12,288 [1] 13,135 [1] 17,895 [1]
Impaired Financing Receivables with No Related Allowance
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 25,049 [2] 52,798 [2]  
Unpaid Principal Balance 25,025 [2] 52,768 [2]  
Related Allowance 0 [2] 0 [2]  
Impaired Financing Receivables with No Related Allowance | Consumer Loan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 725 1,003  
Unpaid Principal Balance 711 989  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Consumer Housing loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 725 1,003  
Unpaid Principal Balance 711 989  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Consumer-Card loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Consumer - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Corporate Loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 24,324 51,795  
Unpaid Principal Balance 24,314 51,779  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Non-recourse Loans | Japan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 6,505 21,409  
Unpaid Principal Balance 6,505 21,407  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Non-recourse Loans | United States
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 2,259 5,825  
Unpaid Principal Balance 2,259 5,825  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Real estate companies
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 3,770 7,063  
Unpaid Principal Balance 3,767 7,060  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Other-Entertainment industry
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 2,614 6,148  
Unpaid Principal Balance 2,613 6,147  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Other - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 9,176 11,350  
Unpaid Principal Balance 9,170 11,340  
Related Allowance 0 0  
Impaired Financing Receivables with No Related Allowance | Purchased loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 0 0  
Unpaid Principal Balance 0 0  
Related Allowance 0 0  
Impaired Financing Receivables with Related Allowance
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 110,775 [3] 159,942 [3]  
Unpaid Principal Balance 110,064 [3] 158,798 [3]  
Related Allowance 49,155 [3] 65,151 [3]  
Impaired Financing Receivables with Related Allowance | Consumer Loan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 11,071 9,858  
Unpaid Principal Balance 11,010 9,828  
Related Allowance 3,279 3,190  
Impaired Financing Receivables with Related Allowance | Consumer Housing loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 6,592 7,496  
Unpaid Principal Balance 6,543 7,471  
Related Allowance 2,432 2,565  
Impaired Financing Receivables with Related Allowance | Consumer-Card loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 2,950 1,858  
Unpaid Principal Balance 2,942 1,854  
Related Allowance 629 547  
Impaired Financing Receivables with Related Allowance | Consumer - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 1,529 504  
Unpaid Principal Balance 1,525 503  
Related Allowance 218 78  
Impaired Financing Receivables with Related Allowance | Corporate Loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 76,629 120,977  
Unpaid Principal Balance 75,979 119,863  
Related Allowance 33,588 48,826  
Impaired Financing Receivables with Related Allowance | Non-recourse Loans | Japan
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 1,363 2,006  
Unpaid Principal Balance 1,299 2,004  
Related Allowance 1,020 1,021  
Impaired Financing Receivables with Related Allowance | Non-recourse Loans | United States
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 14,775 31,810  
Unpaid Principal Balance 14,746 31,706  
Related Allowance 7,514 13,599  
Impaired Financing Receivables with Related Allowance | Real estate companies
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 25,099 40,063  
Unpaid Principal Balance 25,046 39,896  
Related Allowance 8,911 15,862  
Impaired Financing Receivables with Related Allowance | Other-Entertainment industry
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 5,213 5,889  
Unpaid Principal Balance 5,172 5,843  
Related Allowance 1,801 2,118  
Impaired Financing Receivables with Related Allowance | Other - Other
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 30,179 41,209  
Unpaid Principal Balance 29,716 40,414  
Related Allowance 14,342 16,226  
Impaired Financing Receivables with Related Allowance | Purchased loans
      
Financing Receivable, Impaired [Line Items]      
Loans Individually Evaluated for Impairment 23,075 29,107  
Unpaid Principal Balance 23,075 29,107  
Related Allowance ¥ 12,288 ¥ 13,135  
[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").
[2] "With no related allowance recorded" represents impaired loans with no allowance for credit losses as all amounts are considered to be collectible.
[3] "With an allowance recorded" represents impaired loans with the allowance for credit losses as all or a part of the amounts are not considered to be collectible.