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Investments in Unconsolidated Joint Ventures (Information for Investments in Unconsolidated Joint Ventures) (Details) - joint_venture | Feb. 28, 2021 | Nov. 30, 2020
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Schedule of Equity Method Investments [Line Items] |  |
Number of investments in unconsolidated joint ventures | 5 | 5

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- Definition Number of investments in unconsolidated joint ventures. + References No definition available. + Details
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Namespace Prefix: | kbh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration