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Intangible Assets - Additional Information (Detail) $ in Millions | 3 Months Ended
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Dec. 27, 2014 USD ($)
Developed technology |
Finite-Lived Intangible Assets [Line Items] |
IPR&D Asset reclassified to Developed Technology | $ 14.2

X
- Definition IPR&D Asset reclassified to Developed Technology + References No definition available. + Details
Name: | holx_IPRDAssetreclassifiedtoDevelopedTechnology
Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=holx_DevelopedTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |