Document and Entity Information - USD ($)
12 Months Ended
Sep. 30, 2018
Nov. 08, 2018
Mar. 31, 2018
Document and Entity Information [Abstract]      
Entity Registrant Name BEAZER HOMES USA INC    
Entity Central Index Key 0000915840    
Document Type 10-K    
Document Period End Date Sep. 30, 2018    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --09-30    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   33,522,046  
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 520,899,550