Auto Loan Receivables Auto Loan Receivables (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 01, 2020	Aug. 31, 2020	May 31, 2020	Aug. 31, 2019	Aug. 31, 2020	Aug. 31, 2019	Feb. 29, 2020	May 31, 2019	Feb. 28, 2019
Accounts, Notes, Loans and Financing Receivables [Line Items]
Non-Recourse Debt		$ 13,382,375			$ 13,382,375		$ 13,613,272
Provision for loan losses		26,000	$ 122,000	$ 45,500	148,000	$ 83,700
Financing Receivable, Allowance for Credit Loss	$ 359,800	432,546	437,200	$ 150,400	$ 432,546	$ 150,400	$ 157,796	$ 147,000	$ 138,200
Accounting Standards Update 2016-13 [Member]
Accounts, Notes, Loans and Financing Receivables [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect			$ (153,306)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]
Accounts, Notes, Loans and Financing Receivables [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect	153,300
Accounting Standards Update 2016-13 [Member] | Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivables [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 202,000
Existing originations [Member]
Accounts, Notes, Loans and Financing Receivables [Line Items]
Provision for loan losses		29,600
Current Period Originations [Member]
Accounts, Notes, Loans and Financing Receivables [Line Items]
Provision for loan losses		$ 55,600