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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended |  |
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Apr. 08, 2014 | Mar. 25, 2014 | Jan. 29, 2013 | Nov. 30, 2014 | Aug. 31, 2014 | May 31, 2014 | Feb. 28, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | May 31, 2013 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | May 31, 2012 | Feb. 29, 2012 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012 | Jul. 18, 2013 | Jul. 17, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 290,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  | 290,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  |  |  |  | 290,000,000 us-gaap_CommonStockSharesAuthorized | 290,000,000 us-gaap_CommonStockSharesAuthorized |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  | 12,602,735 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |  |  |  |  |  |  |  |  | 12,602,735 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |
Authorized repurchase of common stock |  |  |  | 4,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |  |  |  |  |  |  |  |  | 4,000,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |  |  |  |
Common Stock, Shares, Issued |  |  |  | 115,386,512 us-gaap_CommonStockSharesIssued |  |  |  | 115,296,395 us-gaap_CommonStockSharesIssued |  |  |  |  |  |  |  | 115,386,512 us-gaap_CommonStockSharesIssued | 115,296,395 us-gaap_CommonStockSharesIssued |  |  |
Treasury Stock, Value |  |  |  | $ 446,476 us-gaap_TreasuryStockValue |  |  |  | $ 718,565 us-gaap_TreasuryStockValue |  |  |  |  |  |  |  | $ 446,476 us-gaap_TreasuryStockValue | $ 718,565 us-gaap_TreasuryStockValue |  |  |
Stockholder's Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares that can be purchased by exercising each right |  |  |  | 0.01 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |  |  |  |  |  |  |  |  |  | 0.01 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion |  |  |  |
Purchase price for right holders |  |  |  | $ 85.00 kbh_PurchasePriceRightHolders |  |  |  |  |  |  |  |  |  |  |  | $ 85.00 kbh_PurchasePriceRightHolders |  |  |  |
Exercisable options available |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | earlier of (a) 10 calendar days after a public announcement by us that a person or group has become an Acquiring Person (as defined under the 2009 Rights Agreement) and (b) 10 business days after the commencement of a tender or exchange offer by a person or group if upon consummation of the offer the person or group would beneficially own 4.9% or more of our outstanding common stock. |  |  |  |
Calendar days after a public announcement during which rights to be exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |
Business days after the commencement of a tender or exchange offer during which rights to be exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |
Beneficially ownership in company's outstanding common stock to be held by person or group to exercise rights |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90%kbh_BeneficiallyOwnershipInCompanysOutstandingCommonStockToBeHeldByPersonOrGroupToExerciseRights |  |  |  |
Price at which company may redeem all of the then outstanding rights |  |  |  | 0.001 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights |  |  |  |  |  |  |  |  |  |  |  | 0.001 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights |  |  |  |
Stock Issued During Period, Shares, New Issues | 1,041,666 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 6,944,445 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 6,325,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value, in dollars |  | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |  |  | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare | $ 1.00 us-gaap_CommonStockParOrStatedValuePerShare |  |  |
Treasury Stock Acquired, Average Cost Per Share |  | $ 18.00 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 18.25 us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Treasury Stock Reissued |  |  | 6,325,000 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |  | 7,986,111 us-gaap_StockIssuedDuringPeriodSharesTreasuryStockReissued |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options under which right issued pursuant to the 2009 rights Agreement will expire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | earliest of (a) the close of business on March 5, 2019, (b) the time at which the rights are redeemed, (c) the time at which the rights are exchanged, (d) the time at which our board of directors determines that a related provision in our Restated Certificate of Incorporation is no longer necessary, and (e) the close of business on the first day of a taxable year of ours to which our board of directors determines that no tax benefits may be carried forward. At our annual meeting of stockholders on April 2, 2009, our stockholders approved the 2009 Rights Agreement. |  |  |  |
Cash dividend declared per share |  |  |  | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0250 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.025 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.0625 us-gaap_CommonStockDividendsPerShareDeclared |  |  |  |  |
Stock repurchases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (546)us-gaap_PaymentsForRepurchaseOfCommonStock | (8,488)us-gaap_PaymentsForRepurchaseOfCommonStock | (1,799)us-gaap_PaymentsForRepurchaseOfCommonStock |  |
Proceeds from issuance of common stock, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,045 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 109,503 us-gaap_ProceedsFromIssuanceOrSaleOfEquity | 0 us-gaap_ProceedsFromIssuanceOrSaleOfEquity |  |
Director Stock Units [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 481,554 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = kbh_DirectorStockUnitsDomain |
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 482,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_AwardTypeAxis = kbh_DirectorStockUnitsDomain |
Common Stock, Shares, Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 478,294 us-gaap_CommonStockSharesIssued / us-gaap_AwardTypeAxis = kbh_DirectorStockUnitsDomain |
Treasury Stock, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,900 us-gaap_TreasuryStockValue / us-gaap_AwardTypeAxis = kbh_DirectorStockUnitsDomain |
Director Plan SARs [Domain] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000 us-gaap_CommonStockSharesAuthorized / us-gaap_PlanNameAxis = kbh_DirectorPlanSARsDomain
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 679,815 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = kbh_DirectorPlanSARsDomain
Authorized repurchase of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 680,000 us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_PlanNameAxis = kbh_DirectorPlanSARsDomain

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