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Fair Value Disclosures (Narratives) (Details) (USD $)
3 Months Ended 12 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Nov. 30, 2014
Fair Value Disclosures [Abstract]      
Long-lived assets held and used, carrying value     $ 68,200,000kbh_InventoryImpactedbyPretaxNoncashInventoryImpairmentChargesCarryingValue
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impairment of Real Estate 0us-gaap_ImpairmentOfRealEstate 0us-gaap_ImpairmentOfRealEstate 37,600,000us-gaap_ImpairmentOfRealEstate
Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets, Fair Value Disclosure     $ 30,600,000us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember