Auto Loan Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2022	Aug. 31, 2021	May 31, 2022	Feb. 28, 2022	May 31, 2021	Feb. 28, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 477,543	$ 398,100	$ 477,543	$ 398,100	$ 458,200	$ 433,030	$ 379,500	$ 411,100
Financing Receivable, Allowance for Credit Loss, Writeoff	(96,100)	(43,700)	(164,300)	(85,500)
Financing Receivable, Allowance for Credit Loss, Recovery	39,900	26,800	75,500	61,400
Provision for loan losses	$ 75,500	$ 35,500	133,300	$ 11,100
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)			$ 44,500
Allowance For Loan Losses, percent
Financing Receivable, Allowance for Credit Loss [Line Items]
Item as percent of total ending managed receivables	2.92%	2.66%	2.92%	2.66%	2.85%	2.77%	2.62%	2.97%
Core managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 396,100	$ 360,000	$ 396,100	$ 360,000	$ 390,400	$ 377,500	$ 348,100	$ 379,400
Financing Receivable, Allowance for Credit Loss, Writeoff	(84,200)	(40,300)	(145,600)	(79,000)
Financing Receivable, Allowance for Credit Loss, Recovery	35,900	25,100	69,000	57,300
Provision for loan losses	54,000	27,100	95,200	2,300
Other managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	81,400	38,100	81,400	38,100	$ 67,800	$ 55,500	$ 31,400	$ 31,700
Financing Receivable, Allowance for Credit Loss, Writeoff	(11,900)	(3,400)	(18,700)	(6,500)
Financing Receivable, Allowance for Credit Loss, Recovery	4,000	1,700	6,500	4,100
Provision for loan losses	$ 21,500	$ 8,400	$ 38,100	$ 8,800