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Commitments and Contingencies (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended |
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Nov. 30, 2014 | Aug. 31, 2014 | Nov. 30, 2013 | Aug. 31, 2012 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Nov. 30, 2011
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Real Estate | $ 34,200,000 us-gaap_ImpairmentOfRealEstate | $ 3,400,000 us-gaap_ImpairmentOfRealEstate | $ 400,000 us-gaap_ImpairmentOfRealEstate |  | $ 37,628,000 us-gaap_ImpairmentOfRealEstate |  | $ 391,000 us-gaap_ImpairmentOfRealEstate |  | $ 28,107,000 us-gaap_ImpairmentOfRealEstate |  |  |  |  |  |
Operating Leases, Rent Expense, Net |  |  |  |  | 7,700,000 us-gaap_OperatingLeasesRentExpenseNet |  | 6,500,000 us-gaap_OperatingLeasesRentExpenseNet |  | 5,500,000 us-gaap_OperatingLeasesRentExpenseNet |  |  |  |  |  |
Minimum warranty on electrical and other building systems |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Standard Product Warranty Accrual, Payments |  |  |  |  | 39,458,000 us-gaap_StandardProductWarrantyAccrualPayments |  | 45,338,000 us-gaap_StandardProductWarrantyAccrualPayments |  | 19,701,000 us-gaap_StandardProductWarrantyAccrualPayments |  |  |  |  |  |
Insurance Recoveries |  |  |  |  |  |  |  |  | 26,500,000 us-gaap_InsuranceRecoveries |  |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate |  |  |  |  | 3,000,000 us-gaap_ProductLiabilityContingencyLossExposureNotAccruedBestEstimate |  |  |  |  |  |  |  |  |  |
Maximum Warranty on Electrical Heating Cooling Plumbing and Other Building Systems |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Structural warranty provided by the company |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Warranty for other components of a home |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |
Company's warranty liability | 45,196,000 us-gaap_StandardProductWarrantyAccrual |  | 48,704,000 us-gaap_StandardProductWarrantyAccrual |  | 45,196,000 us-gaap_StandardProductWarrantyAccrual |  | 48,704,000 us-gaap_StandardProductWarrantyAccrual |  | 47,822,000 us-gaap_StandardProductWarrantyAccrual |  |  |  |  | 47,822,000 us-gaap_StandardProductWarrantyAccrual | 67,693,000 us-gaap_StandardProductWarrantyAccrual
Company's estimated liabilities for construction defect | 86,574,000 us-gaap_SelfInsuranceReserve |  | 92,214,000 us-gaap_SelfInsuranceReserve |  | 86,574,000 us-gaap_SelfInsuranceReserve |  | 92,214,000 us-gaap_SelfInsuranceReserve |  | 93,349,000 us-gaap_SelfInsuranceReserve |  |  |  |  | 93,349,000 us-gaap_SelfInsuranceReserve | 94,823,000 us-gaap_SelfInsuranceReserve
Expenses associated with self-insurance |  |  |  |  | 13,491,000 kbh_ExpensesAssociatedWithSelfInsurance | [1] | 8,239,000 kbh_ExpensesAssociatedWithSelfInsurance | [1] | 7,894,000 kbh_ExpensesAssociatedWithSelfInsurance | [1] |  |  |  |  |
Product Warranty Accrual, Preexisting, Increase (Decrease) |  |  |  | 11,200,000 us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | (17,471,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | [2] | (31,959,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | [2] | 8,586,000 us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | [2] |  |  |  |  |
Performance bonds | 541,600,000 kbh_PerformanceBonds |  | 410,800,000 kbh_PerformanceBonds |  | 541,600,000 kbh_PerformanceBonds |  | 410,800,000 kbh_PerformanceBonds |  |  |  |  |  |  |  |
Letters of Credit Outstanding, Amount | 26,700,000 us-gaap_LettersOfCreditOutstandingAmount |  | 41,500,000 us-gaap_LettersOfCreditOutstandingAmount |  | 26,700,000 us-gaap_LettersOfCreditOutstandingAmount |  | 41,500,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  |  |  |  |  |
Deposits under Land Option and Other Similar Contracts | 33,200,000 kbh_DepositsUnderLandOptionAndOtherSimilarContracts |  |  |  | 33,200,000 kbh_DepositsUnderLandOptionAndOtherSimilarContracts |  |  |  |  |  |  |  |  |  |
Non refundable deposits related to land option and other similar contracts | 33,059,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts |  | 41,565,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts |  | 33,059,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts |  | 41,565,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts |  |  |  |  |  |  |  |
Letters of credit | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts |  | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts |  | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts |  | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts |  |  |  |  |  |  |  |
Aggregate Purchase Price Associated with Land Option and Other Similar Contracts | 958,470,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts |  | 1,151,496,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts |  | 958,470,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts |  | 1,151,496,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts |  |  |  |  |  |  |  |
Water Intrusion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Product Liability Accrual, Component Amount | 9,400,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 28,900,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 9,400,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 28,900,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Number of Affected Homes on which Repairs Were Resolved |  |  |  |  | 536 kbh_NumberofAffectedHomesonwhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Number of Affected Homes | 324 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 710 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 324 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 710 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Accumulated Number of Affected Homes | 1,614 kbh_AccumulatedNumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 1,614 kbh_AccumulatedNumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Accumulated Number of affected homes on which repairs were resolved. | 1,290 kbh_AccumulatedNumberOfAffectedHomesOnWhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 754 kbh_AccumulatedNumberOfAffectedHomesOnWhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 1,290 kbh_AccumulatedNumberOfAffectedHomesOnWhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 754 kbh_AccumulatedNumberOfAffectedHomesOnWhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Cumulative Payments Made As Repair Costs For Affected Homes | 63,300,000 kbh_CumulativePaymentsMadeAsRepairCostsForAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 63,300,000 kbh_CumulativePaymentsMadeAsRepairCostsForAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Standard Product Warranty Accrual, Payments |  |  |  |  | 26,600,000 us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 32,700,000 us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Estimated Repair Costs for Affected Homes | 72,700,000 kbh_EstimatedRepairCostsforAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 72,700,000 kbh_EstimatedRepairCostsforAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Number of Affected Attached Home Communities | 3 kbh_NumberofAffectedAttachedHomeCommunities / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 3 kbh_NumberofAffectedAttachedHomeCommunities / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Insurance Recoveries |  |  |  |  | 900,000 us-gaap_InsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Additional Number of Affected Homes Associated with Repair Costs |  |  |  |  | 150 kbh_AdditionalNumberOfAffectedHomesAssociatedWithRepairCosts / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 687 kbh_AdditionalNumberOfAffectedHomesAssociatedWithRepairCosts / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Product Liability Contingency, Third Party Recovery |  |  |  |  | 26,600,000 us-gaap_ProductLiabilityContingencyThirdPartyRecovery / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Product Liability Contingency, Third Party Recovery Included In Warranty Liability |  |  |  |  | 9,400,000 kbh_ProductLiabilityContingencyThirdPartyRecoveryIncludedInWarrantyLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 19,400,000 kbh_ProductLiabilityContingencyThirdPartyRecoveryIncludedInWarrantyLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Receivable | 18,110,000 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 0 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 18,110,000 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 0 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 0 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  | 0 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |
Product Warranty Accrual, Preexisting, Increase (Decrease) |  |  | $ (8,500,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  | $ (5,900,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember | $ (15,900,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember | $ (1,600,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember | $ (2,600,000)us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |
Palm River [Member] | Water Intrusion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Affected Attached Home Communities | 1 kbh_NumberofAffectedAttachedHomeCommunities / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_PalmRiverMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 1 kbh_NumberofAffectedAttachedHomeCommunities / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_PalmRiverMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
Attached Home Communities [Member] | Water Intrusion [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Total Estimated Repair Costs | 64.00%kbh_PercentageofTotalEstimatedRepairCosts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_AttachedHomeCommunitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 64.00%kbh_PercentageofTotalEstimatedRepairCosts / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_AttachedHomeCommunitiesMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |  |  |  |  |  |  |
[1] | a)These expenses are included in selling, general and administrative expenses and are largely offset by contributions from subcontractors participating in the wrap-up policy.
[2] | (b)Adjustments in 2014 were primarily comprised of reclassifications of estimated minimum probable recoveries to receivables and a reclassification to establish a separate accrual for a water intrusion-related inquiry from the Office of the Attorney General of the State of Florida (the “Attorney General’s Office”). These items had no impact on our consolidated statements of operations. Adjustments in 2013 were comprised of charges associated with water intrusion-related issues in central and southwest Florida. In 2012, favorable warranty adjustments were partly offset by similar water intrusion-related charges.

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