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Summary Of Significant Accounting Policies (Narrative) (Details)
$ in Thousands
 12 Months Ended
Mar. 01, 2020
USD ($)
Feb. 28, 2021
USD ($)
warehouse
Feb. 29, 2020
USD ($)
Feb. 28, 2019
USD ($)
Liquid investments, maturity period   three months or less    
Restricted cash from collections on auto loans receivable   $ 496,415 $ 481,043 $ 440,669
Number of warehouses | warehouse   3    
Restricted Cash and Cash Equivalents, Noncurrent   $ 143,213 117,136 107,770
Other investments   152,900 156,700  
Accrued compensation and benefits   223,100 142,900  
General liability and workers' compensation insurance   42,900 41,000  
Advertising expenses   218,600 191,800 167,000
Financing Receivable, Allowance for Credit Loss $ 359,800 411,100 157,800 $ 138,200
Cash, Cash Equivalents, and Short-term Investments   46,900    
Accounting Standards Update 2016-13 [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect   (153,306)    
Asset-backed term funding transactions        
Restricted Cash and Cash Equivalents, Noncurrent   $ 97,200 $ 67,800  
Financing Obligations        
Estimated useful life average, years   25 years    
Financing Receivable | Accounting Standards Update 2016-13 [Member]        
Financing Receivable, Allowance for Credit Loss 202,000      
Retained Earnings | Accounting Standards Update 2016-13 [Member]        
New Accounting Pronouncement or Change in Accounting Principle, Cummulative Effect $ 153,300