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Commitments and Contingencies (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Commitments and Contingencies [Abstract]        
Surety Bonds $ 922.5us-gaap_SpecialAssessmentBondNoncurrent      
Outstanding letters of credit 97.1us-gaap_LettersOfCreditOutstandingAmount      
Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Liabilities for various claims, complaints and other legal actions 457.6us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
469.6us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
456.9us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
482.0us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
Expenses related to legal claims 11.3us-gaap_LitigationSettlementExpense
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
5.5us-gaap_LitigationSettlementExpense
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
   
Estimated insurance recoveries related to legal claims 137.7us-gaap_InsuranceSettlementsReceivable
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
148.1us-gaap_InsuranceSettlementsReceivable
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
138.4us-gaap_InsuranceSettlementsReceivable
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
 
Earnest Money Deposits 64.2us-gaap_EarnestMoneyDeposits
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
     
Remaining purchase price of land under option contracts 2,200.0us-gaap_PurchaseObligation
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
     
Construction defect portion of loss contingency accrual 99.00%dhi_ConstructionDefectPortionOfLossContingencyAccrual
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
  99.00%dhi_ConstructionDefectPortionOfLossContingencyAccrual
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
 
Cash Deposits [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 56.7us-gaap_EarnestMoneyDeposits
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
/ dhi_TypesOfDepositsAxis
= dhi_CashDepositsMember
     
Promissory Notes and Surety Bonds [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Earnest Money Deposits 7.5us-gaap_EarnestMoneyDeposits
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember
/ dhi_TypesOfDepositsAxis
= dhi_PromissoryNotesAndSuretyBondsMember
     
Letter of Credit Two [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 3.1us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= dhi_LetterOfCreditTwoMember
     
Letter of Credit One [Member]        
Commitments and Contingencies [Abstract]        
Outstanding letters of credit 94.0us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LongtermDebtTypeAxis
= dhi_LetterOfCreditOneMember
     
Option Contracts Subject to Specific Performance Clauses [Member] | Homebuilding [Member]        
Commitments and Contingencies [Abstract]        
Remaining purchase price of land under option contracts $ 28.0us-gaap_PurchaseObligation
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= dhi_OptionContractsSubjecttoSpecificPerformanceClausesMember
/ us-gaap_StatementBusinessSegmentsAxis
= dhi_HomebuildingMember