Auto Loan Receivables (Auto Loan Receivables, Net) (Details) (USD $)
May 31, 2014
Feb. 28, 2014
May 31, 2013
Feb. 28, 2013
Non-recourse notes payable $ 7,630,000,000 $ 7,250,000,000    
Total ending managed receivables 7,573,800,000 [1],[2] 7,184,400,000 [1],[2]    
Accrued interest and fees 31,200,000 26,300,000    
Other 18,100,000 7,000,000    
Less allowance for loan losses (75,400,000) (69,900,000) (60,900,000) (57,300,000)
Auto loan receivables, net 7,547,665,000 7,147,848,000    
Warehouse Facilities [Member]
       
Total ending managed receivables 964,000,000 879,000,000    
Term Securitizations [Member]
       
Total ending managed receivables 6,409,000,000 6,145,500,000    
Other Receivables [Member]
       
Total ending managed receivables $ 200,800,000 $ 159,900,000    
[1] Other receivables includes receivables not funded through the warehouse facilities or term securitizations.
[2] Classified based on credit grade assigned when customers were initially approved for financing.