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Notes Payable (Narratives) (Details) (USD $)
3 Months Ended 0 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 17, 2015
Nov. 30, 2014
Debt Instrument [Line Items]        
Line of Credit Facility, Current Borrowing Capacity $ 200,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity      
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      
Proceeds from Issuance of Senior Long-term Debt 250,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 0us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt    
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 8,402,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 8,402,000us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 218,300,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths      
Long-term Debt, Maturities, Repayments of Principal in Year Two 17,100,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo      
Long-term Debt, Maturities, Repayments of Principal in Year Three 265,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree      
Long-term Debt, Maturities, Repayments of Principal in Year Four 300,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour      
Long-term Debt, Maturities, Repayments of Principal in Year Five 630,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive      
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,400,000,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive      
Ownership share in guarantor subsidiaries (percent) 100.00%kbh_OwnershipShareInGuarantorSubsidiaries      
Letters of credit outstanding 27,200,000us-gaap_LettersOfCreditOutstandingAmount     26,700,000us-gaap_LettersOfCreditOutstandingAmount
Inventories pledged to collateralize mortgages and land contracts, carrying value 132,000,000us-gaap_PledgedAssetsNotSeparatelyReportedRealEstate      
Notes and Loans Payable 2,824,170,000us-gaap_NotesAndLoansPayable     2,576,525,000us-gaap_NotesAndLoansPayable
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Unsecured revolving credit facility, maximum borrowing capacity 100,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
     
Unsecured revolving credit facility, remaining borrowing capacity 100,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
     
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Unsecured revolving credit facility, expiration date Mar. 12, 2016      
Unsecured revolving credit facility, maximum borrowing capacity 300,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Line of Credit Facility, Amount Outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Unsecured revolving credit facility, remaining borrowing capacity 200,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
     
Revolving Credit Facility [Member] | Minimum [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
     
Revolving Credit Facility [Member] | Maximum [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
     
Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]        
Debt Instrument [Line Items]        
Senior notes, rate 1.375%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
     
Mortgages and Land Contracts Due to Land Sellers and Other Loans [Member]        
Debt Instrument [Line Items]        
Notes and Loans Payable 35,528,000us-gaap_NotesAndLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
    38,250,000us-gaap_NotesAndLoansPayable
/ us-gaap_LongtermDebtTypeAxis
= kbh_MortgagesAndLandContractsDueToLandSellersAndOtherLoansMember
Convertible Notes Payable [Member] | Convertible Senior Notes Due Two Thousand Nineteen At One Point Three Seven Five Percent [Member] [Member]        
Debt Instrument [Line Items]        
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
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
     
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 8,401,831us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
     
Notes and Loans Payable 230,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
    230,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_ConvertibleSeniorNotesDueTwoThousandNineteenAtOnePointThreeSevenFivePercentMemberMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleNotesPayableMember
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
Notes and Loans Payable 199,898,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandFifteenAtSixPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    199,891,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandFifteenAtSixPointTwoFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior notes due September 15, 2017 at 9.10%        
Debt Instrument [Line Items]        
Senior notes, rate 9.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOneZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    9.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOneZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Notes and Loans Payable 262,909,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOneZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    262,729,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandSeventeenAtNinePointOneZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior Notes Due Two Thousand Nineteen at Four Point Seven Five Percent [Member]        
Debt Instrument [Line Items]        
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
Notes and Loans Payable 400,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    400,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandNineteenatFourPointSevenFivePercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior notes due March 15, 2020 at 8.00%        
Debt Instrument [Line Items]        
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
Notes and Loans Payable 346,396,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    346,253,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyAtEightPointZeroZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior notes due September 15, 2022 at 7.50%        
Debt Instrument [Line Items]        
Senior notes, rate 7.50%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
Notes and Loans Payable 350,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    350,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyTwoAtSevenPointFiveZeroPercentMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior Notes Due Two Thousand Twenty Three At Seven Point Six Two Five Percent [Domain]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount     250,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyThreeAtSevenPointSixTwoFivePercentDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Proceeds from Issuance of Senior Long-term Debt     247,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyThreeAtSevenPointSixTwoFivePercentDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
 
Senior notes, rate 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyThreeAtSevenPointSixTwoFivePercentDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
     
Notes and Loans Payable $ 250,000,000us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyThreeAtSevenPointSixTwoFivePercentDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
    $ 0us-gaap_NotesAndLoansPayable
/ us-gaap_DebtInstrumentAxis
= kbh_SeniorNotesDueTwoThousandTwentyThreeAtSevenPointSixTwoFivePercentDomain
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember