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Income Taxes (Details) (USD $)
3 Months Ended
Feb. 28, 2015
Income Taxes [Line Items]  
Gross unrecognized tax benefits liability $ 5,104,000us-gaap_UnrecognizedTaxBenefits
Net interest and penalties relating to unrecognized tax benefits 480,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Recorded liability for unrecognized tax benefits, net, increased $ 317,000us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease