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Legal Matters (Details) (USD $)	12 Months Ended	3 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Dec. 31, 2007 acre
Nevada Development Contract Litigation
Loss Contingencies [Line Items]
Acres of purchased land by LVDA			83us-gaap_AreaOfRealEstateProperty / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember
Expected compensatory damages	$ 55,000,000us-gaap_LossContingencyDamagesSoughtValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember
Loss Contingency, Range of Possible Loss, Minimum	0us-gaap_LossContingencyRangeOfPossibleLossMinimum / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_NevadaDevelopmentContractLitigationMember
Estancia Coastal Litigation [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Carrying Value, Period Increase (Decrease)		$ 8,200,000us-gaap_LossContingencyAccrualCarryingValuePeriodIncreaseDecrease / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_EstanciaCoastalLitigationMember

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- Definition

Area of a real estate property.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

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-Section 50

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- Definition

The estimated minimum amount of possible loss from the contingency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 20

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-Paragraph 4

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