Document and Entity Information - shares
6 Months Ended
Mar. 31, 2019
Apr. 29, 2019
Document and Entity Information [Abstract]    
Entity Registrant Name BEAZER HOMES USA INC  
Entity Central Index Key 0000915840  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Amendment Flag false  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --09-30  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   32,043,421