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Capitalized Interest (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Rollforward of capitalized interest    
Capitalized interest, beginning of period $ 198.5us-gaap_RealEstateInventoryCapitalizedInterestCosts $ 137.1us-gaap_RealEstateInventoryCapitalizedInterestCosts
Interest incurred 40.4us-gaap_InterestCostsIncurred [1] 49.3us-gaap_InterestCostsIncurred [1]
Interest expensed:    
Amortized to cost of sales (33.6)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales (25.3)us-gaap_RealEstateInventoryCapitalizedInterestCostsCostOfSales
Capitalized Interest Costs Written Off With Inventory Impairments (0.1)dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments 0dhi_CapitalizedInterestCostsWrittenOffWithInventoryImpairments
Capitalized interest, end of period 205.2us-gaap_RealEstateInventoryCapitalizedInterestCosts 161.1us-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
[1] Interest incurred includes interest incurred on the Company's financial services mortgage repurchase facility of $1.6 million and $0.9 million in the three months ended December 31, 2014 and 2013, respectively.