Auto Loan Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Nov. 30, 2022	Nov. 30, 2021	Nov. 30, 2022	Nov. 30, 2021	Aug. 31, 2022	Feb. 28, 2022	Aug. 31, 2021	Feb. 28, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 491,047	$ 426,500	$ 491,047	$ 426,500	$ 477,500	$ 433,030	$ 398,100	$ 411,100
Financing Receivable, Allowance for Credit Loss, Writeoff	(112,600)	(68,200)	(276,900)	(153,700)
Financing Receivable, Allowance for Credit Loss, Recovery	40,400	20,400	115,900	81,800
Provision for loan losses	$ 85,700	$ 76,200	219,000	$ 87,300
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)			$ 58,000
Allowance For Loan Losses, percent
Financing Receivable, Allowance for Credit Loss [Line Items]
Item as percent of total ending managed receivables	2.95%	2.75%	2.95%	2.75%	2.92%	2.77%	2.66%	2.97%
Core managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 396,400	$ 385,700	$ 396,400	$ 385,700	$ 396,100	$ 377,500	$ 360,000	$ 379,400
Financing Receivable, Allowance for Credit Loss, Writeoff	(96,300)	(61,600)	(241,900)	(140,600)
Financing Receivable, Allowance for Credit Loss, Recovery	35,700	18,800	104,700	76,100
Provision for loan losses	60,900	68,500	156,100	70,800
Other managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	94,600	40,800	94,600	40,800	$ 81,400	$ 55,500	$ 38,100	$ 31,700
Financing Receivable, Allowance for Credit Loss, Writeoff	(16,300)	(6,600)	(35,000)	(13,100)
Financing Receivable, Allowance for Credit Loss, Recovery	4,700	1,600	11,200	5,700
Provision for loan losses	$ 24,800	$ 7,700	$ 62,900	$ 16,500