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Investments in Unconsolidated Joint Ventures (Information for Investments in Unconsolidated Joint Ventures) (Details) (USD $) | 3 Months Ended |
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Feb. 28, 2015 lot joint_venture | Feb. 28, 2014 | Nov. 30, 2014 lot joint_venture
Schedule of Equity Method Investments [Line Items] |  |  |
Equity Method Investment, Other than Temporary Impairment | $ 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment | $ 0 us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment |
Proceeds from sale of investment in unconsolidated joint venture | 0 us-gaap_ProceedsFromSaleOfEquityMethodInvestments | 10,110,000 us-gaap_ProceedsFromSaleOfEquityMethodInvestments |
Number of investments in unconsolidated joint ventures | 6 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures |  | 6 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 73,502,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  | 79,441,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
Number of Unconsolidated Joint Venture Lots Controlled Under Land Option Contracts | 484 kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts |  | 618 kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts
Inspirada Builders LLC [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Increase in Inventories Due to Distribution of Land From Equity Method Investees | 8,006,000 kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember | 70,642,000 kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember |
Tax Increment Financing Entities (TIFE) | 0 kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember | 33,197,000 kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember |
Crown Farm Investor, LLC [Domain] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Proceeds from sale of investment in unconsolidated joint venture |  | 10,100,000 us-gaap_ProceedsFromSaleOfEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_CrownFarmInvestorLLCDomain |
Equity Method Investment, Realized Gain (Loss) on Disposal |  | $ 3,200,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_CrownFarmInvestorLLCDomain |
Investments in Unconsolidated Joint Ventures with Debt |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Number of investments in unconsolidated joint ventures | 0 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InvestmentsInUnconsolidatedJointVenturesWithDebtMember |  | 0 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InvestmentsInUnconsolidatedJointVenturesWithDebtMember

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- Definition Increase in Inventory and Inventory-Related Obligations Associated with TIFE Entities + References No definition available. + Details
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- Definition Number of investments in unconsolidated joint ventures. + References No definition available. + Details
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- Definition Number of Unconsolidated Joint Venture Lots Controlled Under Land Option Contracts + References No definition available. + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 + Details
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- Definition Amount of gain (loss) on sale or disposal of an equity method investment. + References No definition available. + Details
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- Definition Total investments in (A) an entity in which the entity has significant influence, but does not have control, (B) subsidiaries that are not required to be consolidated and are accounted for using the equity and or cost method, and (C) an entity in which the reporting entity shares control of the entity with another party or group. Includes long-term advances receivable from a party that is affiliated with the reporting entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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