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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%

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

X

- 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

X

- 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

X

- Details

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