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Segment Information (Narratives) (Details)
 3 Months Ended
Feb. 28, 2015
segment
Schedule of Equity Method Investments [Line Items]  
Number of reporting segments 5us-gaap_NumberOfReportableSegments
Home Community Mortgage, LLC  
Schedule of Equity Method Investments [Line Items]  
Ownership interest in the venture 49.90%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_HomeCommunityMortgageLLCMember
Home Community Mortgage, LLC | Nationstar Mortgage, LLC  
Schedule of Equity Method Investments [Line Items]  
Ownership interest in the venture 50.10%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= kbh_NationstarMortgageLLCMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_HomeCommunityMortgageLLCMember
Homebuilding [Member]  
Schedule of Equity Method Investments [Line Items]  
Number of reporting segments 4us-gaap_NumberOfReportableSegments
/ us-gaap_StatementBusinessSegmentsAxis
= kbh_HomebuildingMember
Financial services [Member]  
Schedule of Equity Method Investments [Line Items]  
Number of reporting segments 1us-gaap_NumberOfReportableSegments
/ us-gaap_StatementBusinessSegmentsAxis
= kbh_FinancialServicesMember