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Fair Value Disclosures (Details) (Fair Value, Measurements, Nonrecurring, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Nov. 30, 2014 | Nov. 30, 2013
Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Post Impairment Fair Value | $ 6,421 kbh_PostImpairmentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | $ 0 kbh_PostImpairmentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Post Impairment Fair Value | $ 24,174 kbh_PostImpairmentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1] | $ 1,143 kbh_PostImpairmentFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsNonrecurringMember | [1]
[1] | (a)Amounts represent the aggregate fair value for real estate assets impacted by inventory impairment charges during the period, as of the date that the fair value measurements were made. The carrying value for these real estate assets may have subsequently increased or decreased from the fair value reflected due to activity that has occurred since the measurement date.

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- Definition Post impairment fair value of land parcels or communities. + References No definition available. + Details
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