Auto Loan Receivables (Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Aug. 31, 2020	May 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2020	May 31, 2020	Mar. 01, 2020	Feb. 29, 2020	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning of period	$ 437,200	$ 157,796	$ 147,000	$ 157,796	$ 138,200
Financing Receivable, Allowance for Credit Loss	437,200	437,200	150,400	157,796	150,400	$ 432,546	$ 437,200	$ 359,800	$ 157,796	$ 150,400	$ 147,000	$ 138,200
Financing Receivable, Allowance for Credit Loss, Writeoff	(53,900)		(76,300)	(124,600)	(142,200)
Financing Receivable, Allowance for Credit Loss, Recovery	23,200		34,200	49,300	70,700
Provision for loan losses	26,000	122,000	45,500	148,000	83,700
Balance as of end of period	$ 432,546	$ 437,200	$ 150,400	$ 432,546	$ 150,400
Allowance For Loan Losses, percent
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Item as percent of total ending managed receivables						3.23%	3.32%	2.64%	1.16%	1.15%	1.14%	1.10%
Accounting Standards Update 2016-13 [Member] | Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Financing Receivable, Allowance for Credit Loss								$ 202,000