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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 9 Months Ended
Nov. 30, 2014
item
Feb. 28, 2014
Summary Of Significant Accounting Policies [Abstract]    
Cash equivalents $ 159,300,000us-gaap_CashEquivalentsAtCarryingValue $ 607,000,000us-gaap_CashEquivalentsAtCarryingValue
Restricted cash from collections on auto loan receivables 275,718,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue 259,299,000us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue
Number of warehouses 2kmx_NumberOfWarehouses  
Required benchmark for account delinquency 120 days  
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 799,100,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 730,600,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Restricted cash on deposit in reserve accounts 37,500,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent 32,500,000us-gaap_RestrictedCashAndCashEquivalentsNoncurrent
Restricted investments $ 52,400,000us-gaap_RestrictedInvestmentsNoncurrent $ 40,200,000us-gaap_RestrictedInvestmentsNoncurrent