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Intangible Assets - Additional Information (Detail) (Developed technology, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Dec. 27, 2014
Developed technology
  
Finite-Lived Intangible Assets [Line Items]  
IPR&D Asset reclassified to Developed Technology $ 14.2holx_IPRDAssetreclassifiedtoDevelopedTechnology
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= holx_DevelopedTechnologyMember