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Key Economic Assumptions Used in Measuring Fair Value Interests Recorded in the Consolidated Balance Sheet (Detail)
 12 Months Ended
Mar. 31, 2010
Direct financing leases | Minimum
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 0.29%
Discount rate 1.17%
Annual prepayment rate 1.52%
Direct financing leases | Maximum
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 1.62%
Discount rate 21.25%
Annual prepayment rate 6.66%
Installment Commercial Mortgage Loans | Minimum
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 0.72%
Discount rate 0.22%
Annual prepayment rate 2.86%
Installment Commercial Mortgage Loans | Maximum
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 14.00%
Discount rate 9.88%
Annual prepayment rate 42.93%
Minimum | Installment Mortgage Loans for individuals
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 0.74%
Discount rate 1.39%
Annual prepayment rate 1.56%
Maximum | Installment Mortgage Loans for individuals
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 1.18%
Discount rate 6.33%
Annual prepayment rate 5.64%
Minimum | Investment in securities
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 1.22%
Discount rate 0.22%
Annual prepayment rate 7.56%
Maximum | Investment in securities
  
Assumption for Fair Value as of Balance Sheet Date of Assets or Liabilities that relate to Transferor's Continuing Involvement [Line Items]  
Expected credit loss 14.00%
Discount rate 18.49%
Annual prepayment rate 42.93%