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Capitalized Interest (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Rollforward of capitalized interest        
Capitalized interest, beginning of period $ 205.2us-gaap_RealEstateInventoryCapitalizedInterestCosts $ 161.1us-gaap_RealEstateInventoryCapitalizedInterestCosts $ 198.5us-gaap_RealEstateInventoryCapitalizedInterestCosts $ 137.1us-gaap_RealEstateInventoryCapitalizedInterestCosts
Interest incurred 42.6us-gaap_InterestCostsIncurred [1] 49.5us-gaap_InterestCostsIncurred [1] 83.0us-gaap_InterestCostsIncurred [1] 98.8us-gaap_InterestCostsIncurred [1]
Interest expensed:        
Amortized to cost of sales (35.6)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales (26.9)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales (69.2)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales (52.2)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales
Capitalized Interest Costs Written Off With Inventory Impairments 0dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments 0dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments (0.1)dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments 0dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments
Capitalized interest, end of period 212.2us-gaap_RealEstateInventoryCapitalizedInterestCosts 183.7us-gaap_RealEstateInventoryCapitalizedInterestCosts 212.2us-gaap_RealEstateInventoryCapitalizedInterestCosts 183.7us-gaap_RealEstateInventoryCapitalizedInterestCosts
Financial Services [Member]        
Rollforward of capitalized interest        
Interest incurred $ 1.6us-gaap_InterestCostsIncurred
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 $ 0.9us-gaap_InterestCostsIncurred
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 $ 3.1us-gaap_InterestCostsIncurred
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember		 $ 1.8us-gaap_InterestCostsIncurred
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1] Interest incurred includes interest incurred on the Company's financial services mortgage repurchase facility of $1.6 million and $3.1 million in the three and six months ended March 31, 2015, respectively, and $0.9 million and $1.8 million in the same periods of 2014.