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Business Segments and Geographic Information - Additional Information (Detail) (USD $)	3 Months Ended
	Dec. 27, 2014 Customer Segment	Dec. 28, 2013 Customer	Sep. 27, 2014 Customer
Segment Reporting Disclosure [Line Items]
Number of reportable segments	4us-gaap_NumberOfReportableSegments
Number of reportable segments	4us-gaap_NumberOfOperatingSegments
Revenues	$ 652,800,000us-gaap_Revenues	$ 612,500,000us-gaap_Revenues
Customers with balances greater than 10% of accounts receivable	0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfAccountsReceivable		0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfAccountsReceivable
Customer represented greater than 10% of consolidated revenues	0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue	0holx_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue
Countries with greater than 10% of consolidated revenue	0holx_Numberofcountrieswithgreaterthan10ofconsolidatedrevenue
Intersegment
Segment Reporting Disclosure [Line Items]
Revenues	$ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember	$ 0us-gaap_Revenues / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember

X

- Definition

Number of countries with greater than 10% of consolidated revenue

+ References

No definition available.

+ Details

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X

- Definition

Number of customers accounting for more than ten percent of accounts receivable.

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number of customers accounting for more than ten percent of revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	holx_SegmentReportingDisclosureLineItems
Namespace Prefix:	holx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfOperatingSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: