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Investments in Unconsolidated Joint Ventures (Additional Information for Investments in Unconsolidated Joint Ventures) (Details) (USD $)
3 Months Ended 12 Months Ended
Feb. 28, 2014
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Schedule of Equity Method Investments [Line Items]        
Number of investments in unconsolidated joint ventures   6kbh_NumberOfInvestmentsInUnconsolidatedJointVentures 9kbh_NumberOfInvestmentsInUnconsolidatedJointVentures  
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   $ 79,441,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures $ 130,192,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures  
Number of Unconsolidated Joint Venture Lots Controlled Under Land Option Contracts   618kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts 5,367kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts  
Proceeds from sale of investment in unconsolidated joint venture   10,110,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments 0us-gaap_ProceedsFromSaleOfEquityMethodInvestments 0us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Equity Method Investment, Realized Gain (Loss) on Disposal     1,100,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 2,100,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Inspirada Builders LLC [Member]        
Schedule of Equity Method Investments [Line Items]        
Increase in Inventories Due to Distribution of Land From Equity Method Investments   90,115,000kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
0kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
0kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
Increase in Inventory and Inventory-Related Obligations Associated with TIFE 33,197,000kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
  0kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
0kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_InspiradaBuildersLLCMember
Crown Farm Investor, LLC [Domain]        
Schedule of Equity Method Investments [Line Items]        
Proceeds from sale of investment in unconsolidated joint venture   10,110,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_CrownFarmInvestorLLCDomain
   
Equity Method Investment, Realized Gain (Loss) on Disposal $ 3,200,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= kbh_CrownFarmInvestorLLCDomain
     
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