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Variable Interest Entities (Details) (USD $) | Aug. 31, 2014 | Nov. 30, 2013
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Cash Deposits | $ 40,465,000 | $ 41,565,000
Aggregate Purchase Price | 904,129,000 | 1,151,496,000
Pre-acquisition costs related to land option contracts and other similar contracts | 50,100,000 | 31,000,000
Outstanding letters of credit | 100,000 | 100,000
Increase in inventories and accrued expenses and other liabilities | 4,000,000 | 8,900,000
Variable Interest Entity, Not Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Cash Deposits | 11,966,000 | 11,063,000
Aggregate Purchase Price | 452,258,000 | 616,000,000
Non-VIE Other land option contracts and other similar contracts [Member] |  |
Variable Interest Entity [Line Items] |  |
Cash Deposits | 28,499,000 | 30,502,000
Aggregate Purchase Price | $ 451,871,000 | $ 535,496,000

X
- 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

X
- 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

X
- 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

X
- 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

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