v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Sep. 28, 2013
Nov. 18, 2013
Mar. 30, 2013
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 28, 2013    
Document Fiscal Year Focus 2013    
Document Fiscal Period Focus FY    
Entity Registrant Name Hologic Inc.    
Entity Central Index Key 0000859737    
Current Fiscal Year End Date --09-28    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   273,128,747  
Entity Public Float     $ 6,049,671,259