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Notes Payable (Narrative) (Details) (USD $)
12 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Nov. 30, 2012
Oct. 29, 2013
Jan. 29, 2013
Jul. 31, 2012
Feb. 07, 2012
Nov. 30, 2013
Aug. 31, 2012
Feb. 29, 2012
Mar. 25, 2014
Mar. 12, 2013
Jul. 30, 2009
Apr. 03, 2006
Debt Instrument [Line Items]                            
Ratio of Consolidated EBITDA to Consolidated Interest Incurred 1.40kbh_RatioofConsolidatedEBITDAtoConsolidatedInterestIncurred                          
Line of Credit Facility, Significant Subsidiary Threshold, Percent 5.00%kbh_LineofCreditFacilitySignificantSubsidiaryThresholdPercent                          
Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent 10.00%kbh_LineofCreditFacilityNonGuarantorSubsidiaryThresholdPercent                          
Incremental Common Shares Attributable to Conversion of Debt Securities 8,402,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 7,044,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities                      
Letters of Credit Outstanding, Amount $ 26,700,000us-gaap_LettersOfCreditOutstandingAmount $ 41,500,000us-gaap_LettersOfCreditOutstandingAmount           $ 41,500,000us-gaap_LettersOfCreditOutstandingAmount            
Gain (loss) on early extinguishment of debt 0us-gaap_GainsLossesOnExtinguishmentOfDebt 10,448,000us-gaap_GainsLossesOnExtinguishmentOfDebt 10,278,000us-gaap_GainsLossesOnExtinguishmentOfDebt                      
Primarily inventories carrying value 133,800,000us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate                          
Proceeds from Issuance of Senior Long-term Debt 400,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 680,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 694,831,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt                      
Long-term Debt, Fiscal Year Maturity [Abstract]                            
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2013 222,200,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2014 16,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2015 265,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2016 300,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due 2017 630,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive                          
Principal payments on senior notes, mortgages and land contracts due to land sellers and other loans due thereafter 1,150,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive                          
Senior notes due December 15, 2021 at 7.00%                            
Debt Instrument [Line Items]                            
Early Repayment of Senior Debt       225,400,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
                   
Convertible senior notes due February 1, 2019 at 1.375%                            
Debt Instrument [Line Items]                            
Senior notes, rate 1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
    1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
    1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
           
Convertible Notes Payable [Member] | Convertible senior notes due February 1, 2019 at 1.375%                            
Debt Instrument [Line Items]                            
Incremental Common Shares Attributable to Conversion of Debt Securities         8,401,831us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Percentage of Principal Amount for Purchase of Notes if Fundamental Change 100.00%kbh_PercentageOfPrincipalAmountForPurchaseOfNotesIfFundamentalChange
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= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                         
Senior notes         230,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Senior notes, rate 1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
          1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
           
Percentage of principal amount in relation to issued value of senior notes         100.00%kbh_PercentageOfPrincipalAmountInRelationToIssuedValueOfSeniorNotes
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Debt Conversion, Converted Instrument, Shares Issued         36.5297us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Debt Instrument, Convertible, Conversion Price         $ 27.37us-gaap_DebtInstrumentConvertibleConversionPrice1
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Conversion Price Premium         47.00%kbh_ConversionPricePremium
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Share Price         $ 18.62us-gaap_SharePrice
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Proceeds from Convertible Debt         222,700,000us-gaap_ProceedsFromConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
                 
Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                            
Debt Instrument [Line Items]                            
Senior notes, rate   700.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
          700.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
           
Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Gain (loss) on early extinguishment of debt               10,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
8,300,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
2,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
       
Extinguishment of Debt, Amount           244,900,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
340,000,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
             
Early Repayment of Senior Debt           252,200,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
340,500,000us-gaap_EarlyRepaymentOfSeniorDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
             
Percentage of principal amount for purchase of notes if change in control 101.00%kbh_PercentageofPrincipalAmountforPurchaseofNotesifChangeinControl
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                         
Senior Notes [Member] | Senior notes due May 15, 2019 at 4.75%                            
Debt Instrument [Line Items]                            
Senior notes                     400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior notes, rate 4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                  4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Percentage of principal amount in relation to issued value of senior notes                     100.00%kbh_PercentageOfPrincipalAmountInRelationToIssuedValueOfSeniorNotes
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Senior Notes [Member] | Senior notes due June 15, 2015 at 6 1/4%                            
Debt Instrument [Line Items]                            
Senior notes, rate 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandFifteenAtSixPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandFifteenAtSixPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
          6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandFifteenAtSixPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50%                            
Debt Instrument [Line Items]                            
Senior notes           350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
               
Senior notes, rate 7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
      7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Percentage of principal amount in relation to issued value of senior notes           100.00%kbh_PercentageOfPrincipalAmountInRelationToIssuedValueOfSeniorNotes
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
               
Senior Notes [Member] | Senior notes due December 15, 2021 at 7.00%                            
Debt Instrument [Line Items]                            
Senior notes       450,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Senior notes, rate 7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  7.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
      7.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Percentage of principal amount in relation to issued value of senior notes       100.00%kbh_PercentageOfPrincipalAmountInRelationToIssuedValueOfSeniorNotes
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyOneAtSevenPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Senior Notes [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Extinguishment of Debt, Amount       215,100,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_SeniorNotesMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
                   
Senior Notes [Member] | Senior notes due September 15, 2017 at 9.10%                            
Debt Instrument [Line Items]                            
Senior notes                         265,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOnePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior notes, rate 9.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOnePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
9.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOnePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
          9.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOnePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Senior Notes [Member] | Senior notes due June 15, 2018 at 7 1/4%                            
Debt Instrument [Line Items]                            
Senior notes                           300,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandEighteenAtSevenPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior notes, rate 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandEighteenAtSevenPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandEighteenAtSevenPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
          7.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandEighteenAtSevenPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Senior Notes [Member] | Senior notes due March 15, 2020 at 8.00%                            
Debt Instrument [Line Items]                            
Senior notes             350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
             
Senior notes, rate 8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
        8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
8.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
           
Percentage of principal amount in relation to issued value of senior notes             98.523%kbh_PercentageOfPrincipalAmountInRelationToIssuedValueOfSeniorNotes
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
             
Senior notes due May 15, 2019 at 4.75%                            
Debt Instrument [Line Items]                            
Proceeds from Issuance of Senior Long-term Debt                     394,600,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
     
Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Expiration Date                       Mar. 12, 2016    
Line of Credit Facility, Maximum Borrowing Capacity                       300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
   
Line of Credit Facility, Remaining Borrowing Capacity 200,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
                         
Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent 10.00%kbh_LineofCreditFacilityNonGuarantorSubsidiaryThresholdPercent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
                         
Letter of Credit [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Maximum Borrowing Capacity                       100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
   
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCreditFacilityAmountOutstanding
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
                         
Line of Credit Facility, Remaining Borrowing Capacity $ 100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
                         
Minimum | Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                            
Debt Instrument [Line Items]                            
Senior notes, rate 500.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                         
Minimum | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                       0.50%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Maximum | Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]                            
Debt Instrument [Line Items]                            
Senior notes, rate 700.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
                         
Maximum | Revolving Credit Facility [Member]                            
Debt Instrument [Line Items]                            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage                       0.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember