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Inventory Impairments and Land Option Contract Abandonments (Narratives) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2015 property lot | Feb. 28, 2014 property lot | Nov. 30, 2014 property
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts | $ 50,200,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts |  | $ 48,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts
Number of land parcels or communities evaluated for recoverability | 20 kbh_NumberOfLandParcelsOrCommunitiesEvaluatedForRecoverability | 11 kbh_NumberOfLandParcelsOrCommunitiesEvaluatedForRecoverability |
Carrying Value of Communities or Land Parcels Evaluated for Impairment | 165,100,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment | 61,300,000 kbh_CarryingValueofCommunitiesorLandParcelsEvaluatedforImpairment |
Pretax, noncash inventory impairment charges | 0 us-gaap_ImpairmentOfRealEstate | 0 us-gaap_ImpairmentOfRealEstate | (37,600,000)us-gaap_ImpairmentOfRealEstate
Aggregate carrying value of inventory impacted by pretax, noncash inventory impairment charges | 266,700,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges |  | 266,600,000 kbh_AggregateCarryingValueOfInventoryImpactedByPretaxNoncashInventoryImpairmentCharges
Number of communities and various other land parcels impacted by pretax, noncash inventory impairment charges | 30 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges |  | 33 kbh_NumberOfCommunitiesAndVariousOtherLandParcelsImpactedByPretaxNoncashInventoryImpairmentCharges
Land Option Contract Abandonment Lots Associated with Projects Less Than $100,000 |  | 3,380 kbh_LandOptionContractAbandonmentLotsAssociatedwithProjectsLessThan100000 |
Land Option Contract Abandonment Lots | 312 kbh_LandOptionContractAbandonmentLots | 650 kbh_LandOptionContractAbandonmentLots |
Maximum [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Acquisition Costs Related To Land Option Contracts And Other Similar Contracts | 100,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Land Option Contract Abandonment [Member] |  |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Payments to Acquire Land | $ (448,000)us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember | $ (433,000)us-gaap_LossOnContractTermination / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_LandOptionContractAbandonmentMember |

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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 Land Option Contract Abandonment Lots Associated with Projects Less Than $100,000 + 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 The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition The loss recognized on termination of a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 912 -SubTopic 275 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6471736&loc=d3e54681-109401 + Details
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