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Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended
	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: