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Fair Value Measurements Fair Value Measurement (Details 2) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 697.7us-gaap_CashAndCashEquivalentsAtCarryingValue $ 661.8us-gaap_CashAndCashEquivalentsAtCarryingValue $ 993.4us-gaap_CashAndCashEquivalentsAtCarryingValue $ 977.4us-gaap_CashAndCashEquivalentsAtCarryingValue
Notes Payable 3,945.5us-gaap_NotesPayable 3,682.8us-gaap_NotesPayable    
Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 665.8us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
632.5us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Restricted Cash and Cash Equivalents 10.4us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
10.0us-gaap_RestrictedCashAndCashEquivalents
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Notes Payable 3,548.0us-gaap_NotesPayable
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
3,323.6us-gaap_NotesPayable
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Homebuilding [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 665.8us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1] 632.5us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1]    
Other Assets, Fair Value Disclosure 10.4us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1] 10.0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1]    
Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Line of Credit Facility, Fair Value of Amount Outstanding 175.0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
300.0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 665.8us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1] 632.5us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1]    
Other Assets, Fair Value Disclosure 10.4us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1] 10.0us-gaap_OtherAssetsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[1]    
Line of Credit Facility, Fair Value of Amount Outstanding 175.0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
300.0us-gaap_LineOfCreditFacilityFairValueOfAmountOutstanding
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Financial Services [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, at Carrying Value 31.9us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
29.3us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
   
Financial Services [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 31.9us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1] 29.3us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1]    
Financial Services [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 397.5us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1] 359.2us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1]    
Financial Services [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 397.5us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1] 359.2us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1]    
Cash and Cash Equivalents, Fair Value Disclosure 31.9us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1] 29.3us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_FinancialServicesMember
[1]    
Line of Credit [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Line of Credit Facility, Amount Outstanding 175.0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
300.0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LineOfCreditMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Senior Notes [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 3,342.6us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
3,000.2us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Senior Notes [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure 3,432.9us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2] 3,033.8us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2]    
Senior Notes [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure 3,432.9us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2] 3,033.8us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2]    
Secured Debt [Member] | Homebuilding [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable 30.4us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
23.4us-gaap_NotesPayable
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Secured Debt [Member] | Homebuilding [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure 30.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2] 23.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2]    
Secured Debt [Member] | Homebuilding [Member] | Estimated Fair Value [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Notes Payable, Fair Value Disclosure $ 30.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2] $ 23.4us-gaap_NotesPayableFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
[2]    
[1] The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
[2] The fair value is determined based on quoted market prices of recent transactions of the notes, which is classified as Level 2 within the fair value hierarchy.