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Variable Interest Entities (Details) (USD $) | Feb. 28, 2015 | Nov. 30, 2014
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Variable Interest Entity [Line Items] |  |
Cash Deposits | $ 28,469,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts | $ 33,059,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts
Aggregate Purchase Price | 829,204,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts | 958,470,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts
Pre-acquisition costs related to land option contracts and other similar contracts | 50,200,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts | 48,000,000 kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts
Outstanding letters of credit | 0 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts | 100,000 kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts
Increase in inventories and accrued expenses and other liabilities | 3,100,000 kbh_IncreaseInInventoriesAndAccruedExpensesAndOtherLiabilitiesDueToLandOptionAndOtherSimilarContracts | 3,100,000 kbh_IncreaseInInventoriesAndAccruedExpensesAndOtherLiabilitiesDueToLandOptionAndOtherSimilarContracts
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Cash Deposits | 9,439,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 10,633,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Aggregate Purchase Price | 456,479,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 520,628,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Non-VIE Other land option contracts and other similar contracts [Member] |  |
Variable Interest Entity [Line Items] |  |
Cash Deposits | 19,030,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = kbh_NonVIELandOptionContractsAndOtherSimilarContractsMember | 22,426,000 kbh_CashDepositsOnLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = kbh_NonVIELandOptionContractsAndOtherSimilarContractsMember
Aggregate Purchase Price | $ 372,725,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = kbh_NonVIELandOptionContractsAndOtherSimilarContractsMember | $ 437,842,000 kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = kbh_NonVIELandOptionContractsAndOtherSimilarContractsMember

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- Definition Acquisition costs related to land option contracts and other similar contracts. + References No definition available. + Details
Name: | kbh_AcquisitionCostsRelatedToLandOptionContractsAndOtherSimilarContracts
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Aggregate purchase price associated with land option and other similar contracts. + References No definition available. + Details
Name: | kbh_AggregatePurchasePriceAssociatedWithLandOptionAndOtherSimilarContracts
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash deposits on land option and other similar contracts. + References No definition available. + Details
Name: | kbh_CashDepositsOnLandOptionAndOtherSimilarContracts
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Increase in inventories and accrued expenses and other liabilities due to land option and other similar contracts. + References No definition available. + Details
Name: | kbh_IncreaseInInventoriesAndAccruedExpensesAndOtherLiabilitiesDueToLandOptionAndOtherSimilarContracts
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Outstanding letters of credit in lieu of cash deposits under certain land option or other similar contracts. + References No definition available. + Details
Name: | kbh_OutstandingLettersOfCreditInLieuOfCashDepositsUnderCertainLandOptionOrOtherSimilarContracts
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=kbh_NonVIELandOptionContractsAndOtherSimilarContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |