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Investments in Unconsolidated Joint Ventures (Additional Information for Investments in Unconsolidated Joint Ventures) (Details) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2014 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012
Schedule of Equity Method Investments [Line Items] |  |  |  |
Number of investments in unconsolidated joint ventures |  | 6 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures | 9 kbh_NumberOfInvestmentsInUnconsolidatedJointVentures |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures |  | $ 79,441,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures | $ 130,192,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |
Number of Unconsolidated Joint Venture Lots Controlled Under Land Option Contracts |  | 618 kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts | 5,367 kbh_NumberofUnconsolidatedJointVentureLotsControlledUnderLandOptionContracts |
Proceeds from sale of investment in unconsolidated joint venture |  | 10,110,000 us-gaap_ProceedsFromSaleOfEquityMethodInvestments | 0 us-gaap_ProceedsFromSaleOfEquityMethodInvestments | 0 us-gaap_ProceedsFromSaleOfEquityMethodInvestments
Equity Method Investment, Realized Gain (Loss) on Disposal |  |  | 1,100,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal | 2,100,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
Inspirada Builders LLC [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Increase in Inventories Due to Distribution of Land From Equity Method Investments |  | 90,115,000 kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember | 0 kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember | 0 kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember
Increase in Inventory and Inventory-Related Obligations Associated with TIFE | 33,197,000 kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember |  | 0 kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember | 0 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 |  | 10,110,000 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 Number of investments in unconsolidated joint ventures. + 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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