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Stock And Stock-Based Incentive Plans (Expected Cash Settlement Range Upon Restricted Stock Unit Vesting) (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Minimum [Member]  
Fiscal 2016 $ 12,307kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInNextFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Fiscal 2017 14,028kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInTwoYears
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Fiscal 2018 16,225kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInThreeYears
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Total expected cash settlements 42,560kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVesting
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 [1]
Maximum [Member]  
Fiscal 2016 32,820kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInNextFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
Fiscal 2017 37,408kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInTwoYears
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
Fiscal 2018 43,266kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVestingInThreeYears
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
Total expected cash settlements $ 113,494kmx_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpectedCashPayoutsUponVesting
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		 [1]
[1] As of November 30, 2014(In thousands)Minimum (1)Maximum (1)Fiscal 2016$ 12,307$ 32,820Fiscal 2017 14,028 37,408Fiscal 2018 16,225 43,266Total expected cash settlements$ 42,560$ 113,494 (1)Net of estimated forfeitures.