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Legal Matters (Details) (USD $) | 12 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Nov. 30, 2014 | Nov. 30, 2013 | Dec. 31, 2007 acre
Nevada Development Contract Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Acres of purchased land by LVDA |  |  | 83 us-gaap_AreaOfRealEstateProperty / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember
Expected compensatory damages | $ 55,000,000 us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember |  |
Loss Contingency, Range of Possible Loss, Minimum | 0 us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember |  |
Estancia Coastal Litigation [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Loss Contingency Accrual, Carrying Value, Period Increase (Decrease) |  | $ 8,200,000 us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_EstanciaCoastalLitigationMember |

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