Auto Loan Receivables (Auto Loan Receivables, Net) (Details) - USD ($) $ in Thousands	Nov. 30, 2016	Aug. 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	Feb. 28, 2015
Non-recourse notes payable	$ 10,462,947		$ 9,527,750
Total ending managed receivables	10,407,700		9,593,600
Accrued interest and fees	41,800		35,000
Other	(1,400)		3,200
Less allowance for loan losses	(114,800)	$ (109,700)	(94,900)	$ (90,900)	$ (87,800)	$ (81,700)
Auto loan receivables, net	10,333,318		9,536,892
Term Securitizations [Member]
Total ending managed receivables	8,473,100		7,828,000
Warehouse facilities
Total ending managed receivables	1,677,000		1,399,000
Other receivables
Total ending managed receivables	$ 257,600		$ 366,600