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Business Segments and Geographic Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 29, 2014 Customer	Mar. 30, 2013 Customer	Mar. 29, 2014 Segment Customer	Mar. 30, 2013 Customer	Sep. 28, 2013 Customer
Segment Reporting Disclosure [Line Items]
Number of reportable segments			4
Revenues	$ 625,008	$ 612,663	$ 1,237,456	$ 1,244,025
Customers with balances greater than 10% of accounts receivable	0		0		0
Customer represented greater than 10% of consolidated revenues	0	0	0	0
Intersegment [Member]
Segment Reporting Disclosure [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

X

- Definition

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

+ References

No definition available.

+ Details

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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_
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X

- Details

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Namespace Prefix:	holx_
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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
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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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