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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Feb. 28, 2014 warehouse | Feb. 28, 2013 | Feb. 29, 2012
Cash equivalents | $ 607,000,000 | $ 430,300,000 |
Liquid investments, maturity period | three months or less |  |
Restricted cash from collections on auto loan receivables | 259,299,000 | 224,287,000 |
Available-for-sale securities | 0 | 0 |
Available-for-sale Securities, Equity Securities | 0 | 0 |
Realized Gain Loss on Available-for-sale Securities | 0 | 0 |
Number of warehouses | 2 |  |
Required benchmark for account delinquency | 120 days |  |
Goodwill and other intangibles, carrying value | 10,100,000 | 10,100,000 |
Impairment of goodwill or intangible assets | 0 | 0 | 0
Restricted cash on deposit in reserve accounts | 32,500,000 | 41,300,000 |
Restricted investments | 40,200,000 | 35,000,000 |
Accrued compensation and benefits | 120,700,000 | 103,400,000 |
General liability and workers' compensation insurance | 29,700,000 | 26,600,000 |
Retail vehicle sales money-back guarantee period, in days | 5 days |  |
ESPs offered on all used vehicles provide coverage for a period of time, in months | 72 months |  |
Advertising expenses | $ 114,600,000 | $ 108,200,000 | $ 100,300,000
Finance Leases [Member] |  |  |
Estimated useful life average, years | 25 years |  |

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