Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	May 31, 2018	Feb. 28, 2018	May 31, 2017	Feb. 28, 2017
Non-recourse notes payable	$ 11,969,825	$ 11,644,615
Total ending managed receivables	11,925,000	11,618,900
Accrued interest and fees	50,500	43,200
Other	1,500	2,200
Less allowance for loan losses	(134,300)	(128,600)	$ (129,800)	$ (123,600)
Auto loan receivables, net	11,842,749	11,535,704
Asset-backed term funding
Total ending managed receivables	9,559,500	9,455,200
Warehouse facilities
Total ending managed receivables	2,028,000	1,834,000
Overcollateralization
Total ending managed receivables	277,400	269,400
Other managed receivables
Total ending managed receivables	$ 60,100	$ 60,300