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Supplemental Disclosure to Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
Summary of cash and cash equivalents at the end of the period:
Cash and cash equivalents	$ 358,768us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 532,523us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 525,688us-gaap_CashAndCashEquivalentsAtCarryingValue
Interest paid, net of amounts capitalized	13,037us-gaap_InterestPaidNet	64,520us-gaap_InterestPaidNet	65,541us-gaap_InterestPaidNet
Income taxes paid	1,619us-gaap_IncomeTaxesPaid	800us-gaap_IncomeTaxesPaid	826us-gaap_IncomeTaxesPaid
Income taxes refunded	1,728us-gaap_ProceedsFromIncomeTaxRefunds	61us-gaap_ProceedsFromIncomeTaxRefunds	22,342us-gaap_ProceedsFromIncomeTaxRefunds
Supplemental disclosures of noncash activities:
Increase (decrease) in consolidated inventories not owned	(5,755)kbh_IncreaseDecreaseInConsolidatedInventoriesNotOwned	4,798kbh_IncreaseDecreaseInConsolidatedInventoriesNotOwned	(19,803)kbh_IncreaseDecreaseInConsolidatedInventoriesNotOwned
Noncash or Part Noncash Acquisition, Inventory Acquired	61,553us-gaap_NoncashOrPartNoncashAcquisitionInventoryAcquired1	27,600us-gaap_NoncashOrPartNoncashAcquisitionInventoryAcquired1	53,625us-gaap_NoncashOrPartNoncashAcquisitionInventoryAcquired1
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost	6,455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	8,346us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost
Homebuilding [Member]
Summary of cash and cash equivalents at the end of the period:
Cash and cash equivalents	356,366us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_HomebuildingMember	530,095us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_HomebuildingMember	524,765us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_HomebuildingMember
Financial services [Member]
Summary of cash and cash equivalents at the end of the period:
Cash and cash equivalents	2,402us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_FinancialServicesMember	2,428us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_FinancialServicesMember	923us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_StatementBusinessSegmentsAxis = kbh_FinancialServicesMember
Inspirada Builders LLC [Member]
Supplemental disclosures of noncash activities:
Increase in Inventories Due to Distribution of Land From Equity Method Investments	90,115kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember	0kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember	0kbh_IncreaseinInventoriesDuetoDistributionofLandFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember
Increase in Inventory and Inventory-Related Obligations Associated with TIFE		0kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember	0kbh_IncreaseinInventoryandInventoryRelatedObligationsAssociatedwithTIFE / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = kbh_InspiradaBuildersLLCMember
Water Intrusion [Member]
Summary of cash and cash equivalents at the end of the period:
Loss Contingency, Receivable	$ 18,110us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember	$ 0us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember	$ 0us-gaap_LossContingencyReceivable / us-gaap_LossContingenciesByNatureOfContingencyAxis = kbh_WaterIntrusionMember

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