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Inventory Impairments and Land Option Contract Abandonments (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2014 community | Aug. 31, 2014 | Nov. 30, 2013 community | Aug. 31, 2014 | Nov. 30, 2014 lot property community | Nov. 30, 2013 property lot community | Nov. 30, 2012 lot property | May 31, 2014 | Feb. 28, 2014 | May 31, 2013
Fair Value Inputs, Assets, Quantitative Information [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 |  |  |  |
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts | 48,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts |  | 31,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts |  | 48,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts |  | 31,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts |  |  |  |  |  |
Carrying Value of Communities of Land Parcels Evaluated for Impairment | 266,900,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |  | 146,000,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |  | 266,900,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |  | 146,000,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |  | 317,400,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |  |  |  |
Number of land parcels or communities associated with non cash inventory impairment charges |  |  |  |  | 8 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges |  | 1 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges |  | 14 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges |  |  |  |
Communities Reactivated |  |  |  | 30 kbh_CommunitiesReactivated |  |  |  |  |  |  |  |  |
Number of land parcels or communities evaluated for recoverability |  |  |  |  | 32 kbh_NumberOfLandParcelsOrCommunitiesEvaluatedForRecoverability |  | 31 kbh_NumberOfLandParcelsOrCommunitiesEvaluatedForRecoverability |  | 61 kbh_NumberOfLandParcelsOrCommunitiesEvaluatedForRecoverability |  |  |  |
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | 266,600,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges |  | 293,100,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges |  | 266,600,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges |  | 293,100,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges |  |  |  |  |  |
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | 33 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges |  | 42 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges |  | 33 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges |  | 42 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges |  |  |  |  |  |
Number of Lots on which abandonment charges are recognized |  |  |  |  | 1,306 kbh_LotOptionContractAbandonment |  | 295 kbh_LotOptionContractAbandonment |  | 446 kbh_LotOptionContractAbandonment |  |  |  |
Remaining useful life in addition to specified useful lives |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Land Option Contract Abandonment Lots Associated with Projects Less Than $100,000 |  |  |  |  | 7,292 kbh_LandOptionContractAbandonmentLotsAssociatedwithProjectsLessThan100000 |  | 9,406 kbh_LandOptionContractAbandonmentLotsAssociatedwithProjectsLessThan100000 |  | 8,157 kbh_LandOptionContractAbandonmentLotsAssociatedwithProjectsLessThan100000 |  |  |  |
Specified period of remaining useful lives |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Expected realization period of inventory maximum |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Land [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  |  |  | (26,600,000)us-gaap_ImpairmentOfRealEstate / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_LandMember |  |  |  |  |  |  |  |
Number of land parcels or communities associated with non cash inventory impairment charges |  |  |  |  | 2 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_LandMember |  |  |  |  |  |  |  |
Communities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Real Estate |  |  |  |  | (11,000,000)us-gaap_ImpairmentOfRealEstate / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = kbh_CommunitiesMember |  |  |  |  |  |  |  |
Number of land parcels or communities associated with non cash inventory impairment charges |  |  |  | 3 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = kbh_CommunitiesMember | 6 kbh_NumberOfLandParcelsOrCommunitiesAssociatedWithNonCashInventoryImpairmentCharges / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = kbh_CommunitiesMember |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Estimate Input at Average Selling Price |  |  |  |  | 216,100 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 339,700 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 115,200 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] |  |  |
Fair Value Estimate Input at Sales for Period |  |  |  |  | 1 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 1 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 1 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] |  |  |
Fair Value Inputs, Discount Rate |  |  |  |  | 17.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 17.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] | 17.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MinimumMember | [1] |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Estimate Input at Average Selling Price |  |  |  |  | 316,800 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 339,700 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 556,300 kbh_FairValueEstimateInputAtAverageSellingPrice / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] |  |  |
Fair Value Estimate Input at Sales for Period |  |  |  |  | 4 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 1 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 6 kbh_FairValueEstimateInputAtDeliveryForPeriod / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] |  |  |
Fair Value Inputs, Discount Rate |  |  |  |  | 19.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 17.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] | 20.00%us-gaap_FairValueInputsDiscountRate / us-gaap_RangeAxis = us-gaap_MaximumMember | [1] |  |  |
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts | 100,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  | 100,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |
Estimate of Fair Value Measurement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Assets, Fair Value Disclosure | 30,600,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 1,100,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 30,600,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 1,100,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  | 39,900,000 us-gaap_AssetsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |  |  |  |
Land Option Contract Abandonment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on Contract Termination |  | $ 1,000,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember | $ 2,900,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember |  | $ 1,803,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember |  | $ 3,190,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember |  | $ 426,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember |  | $ 400,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember | $ 400,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember | $ 300,000 us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember
Palizada [Member] | West Coast [Member] | Land [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | 80 us-gaap_AreaOfLand / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_PalizadaMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = kbh_WestCoastMember |  |  |  | 80 us-gaap_AreaOfLand / us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis = kbh_PalizadaMember / us-gaap_ImpairedLongLivedAssetsHeldAndUsedByTypeAxis = us-gaap_LandMember / us-gaap_StatementBusinessSegmentsAxis = kbh_WestCoastMember |  |  |  |  |  |  |  |
[1] | The ranges of inputs used in each period primarily reflect differences between the housing markets where each of the impacted communities or land parcels are located, rather than fluctuations in prevailing market conditions.

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- Definition Acquisition costs related to land option contracts and other similar contracts. + References No definition available. + Details
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- Definition Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges. + References No definition available. + Details
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- Definition Carrying Value of Communities or Land Parcels Evaluated for Impairment + References No definition available. + Details
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- Definition Fair value estimate input at average selling price. + References No definition available. + Details
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- Definition Fair value estimate input at delivery for period. + References No definition available. + Details
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- Definition Land Option Contract Abandonment Lots Associated with Projects Less Than $100,000 + References No definition available. + Details
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- Definition Number of lots on which abandonment charges are recognized. + References No definition available. + Details
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- Definition Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges. + References No definition available. + Details
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- Definition Number of land parcels or communities associated with non cash inventory impairment charges. + References No definition available. + Details
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- Definition Number of land parcels or communities evaluated for recoverability. + References No definition available. + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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