Auto Loan Receivables (Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	May 31, 2023	May 31, 2022	Feb. 28, 2023	Feb. 28, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 535,412	$ 458,200	$ 507,201	$ 433,000
Financing Receivable, Allowance for Credit Loss, Writeoff	(109,800)	(68,200)
Financing Receivable, Allowance for Credit Loss, Recovery	57,100	35,600
Provision for loan losses	80,900	$ 57,800
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)	$ 28,200
Allowance For Loan Losses, percent
Financing Receivable, Allowance for Credit Loss [Line Items]
Item as percent of total ending managed receivables	3.11%	2.85%	3.02%	2.77%
Core managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 427,500	$ 390,400	$ 401,500	$ 377,500
Financing Receivable, Allowance for Credit Loss, Writeoff	(93,100)	(61,400)
Financing Receivable, Allowance for Credit Loss, Recovery	50,500	33,100
Provision for loan losses	68,600	41,200
Other managed receivables
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	107,900	67,800	$ 105,700	$ 55,500
Financing Receivable, Allowance for Credit Loss, Writeoff	(16,700)	(6,800)
Financing Receivable, Allowance for Credit Loss, Recovery	6,600	2,500
Provision for loan losses	$ 12,300	$ 16,600