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Commitments and Contingencies (Narratives) (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Feb. 28, 2015 | Feb. 28, 2014 | Nov. 30, 2014
Loss Contingencies [Line Items] |  |  |  |  |
Structural warranty provided by the company (in years) | 10 years |  |  |  |
Minimum warranty on electrical and other building systems (in years) | 2 years |  |  |  |
Maximum warranty on electrical and other building systems (in years) | 5 years |  |  |  |
Warranty for other components of a home (in years) | 1 year |  |  |  |
Payments | $ (7,595,000)us-gaap_StandardProductWarrantyAccrualPayments |  | $ (8,711,000)us-gaap_StandardProductWarrantyAccrualPayments |  |
Adjustment to increase warranty liability | 3,623,000 us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | [1] | 0 us-gaap_ProductWarrantyAccrualPreexistingIncreaseDecrease | [1] |
Performance bonds | 550,400,000 kbh_PerformanceBonds |  |  |  | 541,600,000 kbh_PerformanceBonds
Letters of credit outstanding | 27,200,000 us-gaap_LettersOfCreditOutstandingAmount |  |  |  | 26,700,000 us-gaap_LettersOfCreditOutstandingAmount
Cash deposits | 28,469,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts |  |  |  | 33,059,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts
Letters of credit | 0 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts |  |  |  | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts
Aggregate purchase price of land | 829,204,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts |  |  |  | 958,470,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts
Water Intrusion [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss Contingency, Receivable | 3,623,000 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | 0 us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |
Warranty Liability Associated with Water Intrusion | 5,800,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 9,400,000 us-gaap_ProductLiabilityAccrualComponentAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember
Number of Homes Affected by Water Intrusion | 231 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  | 324 kbh_NumberofAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember
Additional Number of Affected Homes Associated with Repair Costs | 18 kbh_AdditionalNumberOfAffectedHomesAssociatedWithRepairCosts / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Number of Affected Homes on which Repairs Were Resolved | 111 kbh_NumberofAffectedHomesonwhichRepairsWereResolved / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Payments | (4,100,000)us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  | (6,000,000)us-gaap_StandardProductWarrantyAccrualPayments / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |
Payments made as repair costs for homes with Water Intrusion | (67,400,000)kbh_CumulativePaymentsMadeAsRepairCostsForAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Estimated repair costs for homes with Water Intrusion | 73,200,000 kbh_EstimatedRepairCostsforAffectedHomes / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Insurance Recoveries | 5,000,000 us-gaap_InsuranceRecoveries / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Product Liability Contingency, Third Party Recovery | 21,600,000 us-gaap_ProductLiabilityContingencyThirdPartyRecovery / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Product Liability Contingency, Third Party Recovery Included In Warranty Liability | 5,800,000 kbh_ProductLiabilityContingencyThirdPartyRecoveryIncludedInWarrantyLiability / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember |  |  |  |
Minimum [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate | 0 us-gaap_ProductLiabilityContingencyLossExposureNotAccruedBestEstimate / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Minimum [Member] | Water Intrusion [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate | 0 us-gaap_ProductLiabilityContingencyLossExposureNotAccruedBestEstimate / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |
Maximum [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate | 5,000,000 us-gaap_ProductLiabilityContingencyLossExposureNotAccruedBestEstimate / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Maximum [Member] | Water Intrusion [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Product Liability Contingency, Loss Exposure Not Accrued, Best Estimate | $ 3,000,000 us-gaap_ProductLiabilityContingencyLossExposureNotAccruedBestEstimate / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
[1] | As discussed below, adjustments for the three months ended February 28, 2015 were comprised of a reclassification of estimated minimum probable recoveries to receivables and had no impact on our consolidated statement of operations for the period.

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