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v3.20.2

Supplemental Guarantor Information (Narrative) (Details) | 9 Months Ended
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Aug. 31, 2020
Guarantees [Abstract] |
Ownership share in guarantor subsidiaries, percent | 100.00%
Line of credit facility, significant subsidiary threshold, percent | 5.00%
Line of credit facility, non guarantor subsidiary threshold, percent | 10.00%

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- Definition Line of Credit Facility, Non Guarantor Subsidiary Threshold, Percent + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line of Credit Facility, Significant Subsidiary Threshold, Percent + References No definition available. + Details
Name: | kbh_LineofCreditFacilitySignificantSubsidiaryThresholdPercent
Namespace Prefix: | kbh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Ownership share in guarantor subsidiaries. + References No definition available. + Details
Name: | kbh_OwnershipShareInGuarantorSubsidiaries
Namespace Prefix: | kbh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration