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Inventory Impairments and Land Option Contract Abandonments (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2012 Communities | May 31, 2012 Communities
Maximum [Member] |  |
Unobservable input Range |  |
Fair value estimate input at average selling price | $ 487,300 | $ 498,000
Fair value estimate input at sales for the period | 6 | 6
Discount rate used in estimating discounted cash flow | 20.00% | 20.00%
Minimum [Member] |  |
Unobservable input Range |  |
Fair value estimate input at average selling price | $ 115,200 | $ 115,200
Fair value estimate input at sales for the period | 1 | 1
Discount rate used in estimating discounted cash flow | 17.00% | 17.00%

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Namespace Prefix: | kbh_
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Balance Type: | na
Period Type: | duration

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- Definition Fair value estimate input at average selling price. + References No definition available. + Details
Name: | kbh_FairValueEstimateInputAtAverageSellingPrice
Namespace Prefix: | kbh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value estimate input at sales for period. + References No definition available. + Details
Name: | kbh_FairValueEstimateInputAtSalesForPeriod
Namespace Prefix: | kbh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | kbh_FairValueUnobservableInputAbstract
Namespace Prefix: | kbh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration