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Document and Entity Information
6 Months Ended
Mar. 31, 2015
Apr. 20, 2015
Document and Entity Information [Abstract]    
Entity Registrant Name HORTON D R INC /DE/  
Entity Central Index Key 0000882184  
Document Type 10-Q  
Document Period End Date Mar. 31, 2015  
Amendment Flag false  
Document Fiscal Year Focus 2015  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --09-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   366,625,378dei_EntityCommonStockSharesOutstanding