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Investments in Unconsolidated Joint Ventures (Narrative) (Details) (USD $)
 12 Months Ended
Nov. 30, 2014
joint_venture
Nov. 30, 2013
joint_venture
Nov. 30, 2012
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Other than Temporary Impairment $ 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment $ 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment $ 0us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
Investments in unconsolidated joint ventures $ 79,441,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 130,192,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures  
Number of investments in unconsolidated joint ventures 6kbh_NumberOfInvestmentsInUnconsolidatedJointVentures 9kbh_NumberOfInvestmentsInUnconsolidatedJointVentures  
Investments in Unconsolidated Joint Ventures with Debt      
Schedule of Equity Method Investments [Line Items]      
Number of investments in unconsolidated joint ventures 0kbh_NumberOfInvestmentsInUnconsolidatedJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InvestmentsInUnconsolidatedJointVenturesWithDebtMember		 0kbh_NumberOfInvestmentsInUnconsolidatedJointVentures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InvestmentsInUnconsolidatedJointVenturesWithDebtMember