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Fair Value Measurements (Details 1) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Real Estate Acquired Through Foreclosure 0.5us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 $ 0.7us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Inventories [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 21.6us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_InventoriesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		 [1],[2] 19.2us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_InventoriesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		 [1],[2]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Homebuilding [Member] | Assets Held-for-sale [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure, Nonrecurring 1.4us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		 [1],[3] 8.2us-gaap_AssetsFairValueDisclosureNonrecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_PublicUtilitiesInventoryAxis
= us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		 [1],[3]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Financial Services [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other mortgage loans 14.6us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 [1],[4] 16.0us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 [1],[4]
Real Estate Acquired Through Foreclosure 0.2us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 [1],[4] $ 0.5us-gaap_RealEstateAcquiredThroughForeclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 [1],[4]
Inventories [Member] | Minimum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 12.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InventoriesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		  
Inventories [Member] | Maximum [Member] | Homebuilding [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Inputs, Discount Rate 18.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_InventoriesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember		  
[1] The fair values included in the table above represent only those assets whose carrying values were adjusted to fair value in the respective quarter.
[2] In performing its impairment analysis of communities, discount rates ranging from 12% to 18% were used in the periods presented.
[3] The fair value of inventory available for sale was determined based on recent offers received from outside third parties, comparable sales or actual contracts.
[4] The fair values of other mortgage loans and real estate owned are determined based on the value of the underlying collateral.