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Inventory Impairments and Land Option Contract Abandonments (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2012 community | Aug. 31, 2012 community
Maximum |  |  |  |
Unobservable Input |  |  |  |
Average selling price | $ 246,200 | [1] | $ 497,900 | [1]
Deliveries per month | 4 | [1] | 6 | [1]
Discount rate | 20.00% | [1] | 20.00% | [1]
Minimum |  |  |  |
Unobservable Input |  |  |  |
Average selling price | $ 152,000 | [1] | $ 115,200 | [1]
Deliveries per month | 2 | [1] | 1 | [1]
Discount rate | 17.00% | [1] | 17.00% | [1]
[1] | The ranges of inputs used primarily reflect the underlying variability among the various housing markets where each of the impacted communities or land parcels are located, rather than changes in prevailing market conditions.

X
- Definition Discount rate used in estimating discounted cash flow. + References No definition available. + Details
Name: | kbh_DiscountRateUsedInEstimatingDiscountedCashFlow
Namespace Prefix: | kbh_
Data Type: | num:percentItemType
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