Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($)
$ in Thousands
May. 31, 2015
Feb. 28, 2015
May. 31, 2014
Feb. 28, 2014
Non-recourse notes payable $ 8,860,000 $ 8,470,000    
Total ending managed receivables [1],[2] 8,862,600 8,458,700    
Accrued interest and fees 35,100 31,200    
Other (1,100) 27,300    
Less allowance for loan losses (83,700) (81,700) $ (75,400) $ (69,900)
Auto loan receivables, net 8,812,883 8,435,504    
Warehouse Facilities [Member]        
Total ending managed receivables 1,089,000 986,000    
Term Securitizations [Member]        
Total ending managed receivables 7,485,800 7,226,500    
Other Receivables [Member]        
Total ending managed receivables [2] $ 287,800 $ 246,200    
[1] Classified based on credit grade assigned when customers were initially approved for financing.
[2] Other receivables includes receivables not funded through the warehouse facilities or term securitizations.