Supplemental Guarantor Information (Narrative) (Details)	12 Months Ended
Nov. 30, 2017
Guarantees [Abstract]
Ownership share in guarantor subsidiaries	100.00%
Line of Credit Facility, Significant Subsidiary Threshold, Percent	5.00%
Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent	10.00%

Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent

No definition available.

Name:	kbh_LineofCreditFacilityNonGuarantorSubsidiaryThresholdPercent
Namespace Prefix:	kbh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration