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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2014 | Nov. 30, 2014 | Nov. 30, 2013 | Nov. 30, 2012
Income Tax Disclosure [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | 7.40%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses | (75.10%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseImpairmentLosses
Income tax benefit computed at the statutory U.S. federal income tax rate and income tax benefit (expense) provided in the consolidated statements of operations |  |  |  |
Income tax benefit computed at statutory rate |  | $ (33,232)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (13,427)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ 27,672 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | (35.00%)us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (decrease) resulting from |  |  |  |
State taxes, net of federal income tax benefit |  | (13,907)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | (1,947)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 9,948 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent |  | (14.70%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | (5.10%)us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 12.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount |  | 0 us-gaap_IncomeTaxReconciliationDeductionsOther | (1,808)us-gaap_IncomeTaxReconciliationDeductionsOther | (9,146)us-gaap_IncomeTaxReconciliationDeductionsOther
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther | (4.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther | (11.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsOther
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount |  | 1,249 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 0 us-gaap_IncomeTaxReconciliationOtherReconcilingItems | 7,960 us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | 1.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent | 10.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherReconcilingItemsPercent
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount |  | 10,441 us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | (9,598)us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | 42,503 us-gaap_IncomeTaxReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Percent |  | 11.00%us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | (25.00%)us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary | 53.80%us-gaap_EffectiveIncomeTaxRateReconciliationEquityInEarningsLossesOfUnconsolidatedSubsidiary
NOLs reconciliation |  | 12,973 kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLoss | (3,806)kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLoss | (5,345)kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLoss
Effective Income Tax Reconciliation Change Net Operating Loss, Percentage |  | 13.70%kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLossPercentage | (9.90%)kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLossPercentage | (6.80%)kbh_EffectiveIncomeTaxReconciliationChangeNetOperatingLossPercentage
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | 0 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | 2,827 us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses | (59,401)us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Recognition of federal tax benefits |  | 59 kbh_EffectiveIncomeTaxReconciliationRecognitionofFederalTaxBenefits | 1,600 kbh_EffectiveIncomeTaxReconciliationRecognitionofFederalTaxBenefits | 17,650 kbh_EffectiveIncomeTaxReconciliationRecognitionofFederalTaxBenefits
Effective Income tax Reconciliation Recognition of Federal Tax Benefits, Percent |  | 0.10%kbh_EffectiveIncometaxReconciliationRecognitionofFederalTaxBenefitsPercent | 4.20%kbh_EffectiveIncometaxReconciliationRecognitionofFederalTaxBenefitsPercent | 22.30%kbh_EffectiveIncometaxReconciliationRecognitionofFederalTaxBenefitsPercent
Tax credits |  | 2,884 us-gaap_IncomeTaxReconciliationTaxCredits | 2,675 us-gaap_IncomeTaxReconciliationTaxCredits | 17,889 us-gaap_IncomeTaxReconciliationTaxCredits
Effective Income Tax Rate Reconciliation, Tax Credit, Percent |  | 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | 7.00%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits | 22.60%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Valuation allowance for deferred tax assets |  | 825,232 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 20,673 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | (32,286)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent |  | 869.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | 53.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance | (40.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Percent |  | 16.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization | 11.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization | 3.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciationAndAmortization
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation and Amortization, Amount |  | 15,765 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization | 4,523 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization | 2,482 us-gaap_IncomeTaxReconciliationNondeductibleExpenseDepreciationAndAmortization
Other, net |  | 1,936 us-gaap_IncomeTaxReconciliationOtherAdjustments | (112)us-gaap_IncomeTaxReconciliationOtherAdjustments | 174 us-gaap_IncomeTaxReconciliationOtherAdjustments
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent |  | 2.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | (0.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Income tax benefit | 824,200 us-gaap_IncomeTaxExpenseBenefit | 823,400 us-gaap_IncomeTaxExpenseBenefit | 1,600 us-gaap_IncomeTaxExpenseBenefit | 20,100 us-gaap_IncomeTaxExpenseBenefit
Effective Income Tax Rate Reconciliation, Percent |  | 867.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 4.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 25.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Reconciliation of the beginning and ending balances of the gross unrecognized benefits |  |  |  |
Balance at beginning of year |  | 206 us-gaap_UnrecognizedTaxBenefits | 1,671 us-gaap_UnrecognizedTaxBenefits | 1,899 us-gaap_UnrecognizedTaxBenefits
Reductions for tax positions related to prior years |  | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | 0 us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (165)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Reductions due to lapse of statute of limitations |  | 0 us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (1,465)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (63)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Balance at the end of year | $ 206 us-gaap_UnrecognizedTaxBenefits | $ 206 us-gaap_UnrecognizedTaxBenefits | $ 206 us-gaap_UnrecognizedTaxBenefits | $ 1,671 us-gaap_UnrecognizedTaxBenefits

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other deductions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 2 -Article 4 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depreciation and amortization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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