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Segment Information (Narratives) (Details) | 3 Months Ended
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Feb. 28, 2015 segment
Schedule of Equity Method Investments [Line Items] |
Number of reporting segments | 5 us-gaap_NumberOfReportableSegments
Home Community Mortgage, LLC |
Schedule of Equity Method Investments [Line Items] |
Ownership interest in the venture | 49.90%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_HomeCommunityMortgageLLCMember
Home Community Mortgage, LLC | Nationstar Mortgage, LLC |
Schedule of Equity Method Investments [Line Items] |
Ownership interest in the venture | 50.10%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = kbh_NationstarMortgageLLCMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_HomeCommunityMortgageLLCMember
Homebuilding [Member] |
Schedule of Equity Method Investments [Line Items] |
Number of reporting segments | 4 us-gaap_NumberOfReportableSegments / us-gaap_StatementBusinessSegmentsAxis = kbh_HomebuildingMember
Financial services [Member] |
Schedule of Equity Method Investments [Line Items] |
Number of reporting segments | 1 us-gaap_NumberOfReportableSegments / us-gaap_StatementBusinessSegmentsAxis = kbh_FinancialServicesMember

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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Balance Type: | na
Period Type: | instant

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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X
- Details
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Namespace Prefix: |
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- Details
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Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |