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Variable Interest Entities (Details) (USD $) | Feb. 28, 2013 | Nov. 30, 2012
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Variable Interest Entities [Abstract] |  |
Cash deposits associated with land option and other similar contracts of unconsolidated VIE's | $ 9,838,000 | $ 8,463,000
Total cash deposits associated with land option and other similar contracts that were not VIE's | 11,564,000 | 17,219,000
Cash Deposits on Land Option and Other Similar Contracts | 21,402,000 | 25,682,000
Aggregate purchase price of land option and other similar contracts of unconsolidated VIE's | 345,664,000 | 327,196,000
Aggregate purchase price of land option and other similar contracts that were not VIE's | 188,727,000 | 298,139,000
Aggregate Purchase Price Associated with Land Option and Other Similar Contracts | 534,391,000 | 625,335,000
Pre-acquisition costs related to land option contracts and other similar contracts | 22,900,000 | 25,400,000
Outstanding letters of credit | 200,000 | 500,000
Increase in inventories and accrued expenses and other liabilities | $ 8,900,000 | $ 4,100,000

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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 associated with land option and other similar contracts of non variable interest entities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Cash deposits associated with land option and other similar contracts of unconsolidated variable interest entities. + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Cash deposits on land option and other similar contracts. + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
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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
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Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Purchase price associated with land option and other similar contracts of non variable interest entities. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Purchase price associated with land option and other similar contracts of unconsolidated variable interest entities. + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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