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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Nov. 30, 2013
Deferred tax liabilities    
Deferred Tax Liabilities, Deferred Expense, Capitalized Interest $ 103,196us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest $ 87,599us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedInterest
Deferred Tax Liability, State Taxes 72,258kbh_DeferredTaxLiabilityStateTaxes 62,884kbh_DeferredTaxLiabilityStateTaxes
Deferred Tax Liabilities, Property, Plant and Equipment 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 300us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other 310us-gaap_DeferredTaxLiabilitiesOther 208us-gaap_DeferredTaxLiabilitiesOther
Total 175,764us-gaap_DeferredIncomeTaxLiabilities 150,991us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Inventory impairments and land option contract abandonments 229,264us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses 110,745us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsImpairmentLosses
NOL from 2006 through 2013 459,393us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 459,885us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Warranty, legal and other accruals 42,621us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 50,110us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Employee benefits 82,776us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 73,039us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
Partnerships and joint ventures 15,672us-gaap_DeferredTaxAssetsEquityMethodInvestments 122,081us-gaap_DeferredTaxAssetsEquityMethodInvestments
Deferred Tax Assets, Property, Plant and Equipment 9,022us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Tax Deferred Expense, Other 12,528us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther 9,359us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Tax credits 176,234us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 173,289us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred income 638us-gaap_DeferredTaxAssetsDeferredIncome 656us-gaap_DeferredTaxAssetsDeferredIncome
Other 13,998us-gaap_DeferredTaxAssetsOther 11,267us-gaap_DeferredTaxAssetsOther
Total 1,042,146us-gaap_DeferredTaxAssetsGross 1,010,431us-gaap_DeferredTaxAssetsGross
Valuation allowance (41,150)us-gaap_DeferredTaxAssetsValuationAllowance (859,440)us-gaap_DeferredTaxAssetsValuationAllowance
Total 1,000,996us-gaap_DeferredTaxAssetsNet 150,991us-gaap_DeferredTaxAssetsNet
Deferred Tax Assets, Net $ 825,232us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet