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Fair Value Disclosures (Detail Textuals)
 12 Months Ended
Mar. 31, 2013
Contracts | Minimum
  
Financial Instruments Not Measured At Fair Value [Line Items]  
Initial term of the indirect finance receivables 12 months
Contracts | Maximum
  
Financial Instruments Not Measured At Fair Value [Line Items]  
Initial term of the indirect finance receivables 72 months
Direct Loans | Minimum
  
Financial Instruments Not Measured At Fair Value [Line Items]  
Initial term of the direct finance receivables 6 months
Direct Loans | Maximum
  
Financial Instruments Not Measured At Fair Value [Line Items]  
Initial term of the direct finance receivables 48 months