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Sale of Makena - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 29, 2012	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Regulatory Assets [Abstract]
Amended transaction price as a result of executing amendment		$ 199.5
Transaction Price Amounts Received				12.4	84.5
Final payment received	60.0
Gain on net of certain contingent legal fees and amounts due to inventory	$ 53.9	$ 0	$ 53.9	$ 12.4

X

- Definition

Represents total transaction price for the sale of certain intellectual property rights as a result of executing an amendment to the original agreement.

+ References

No definition available.

+ Details

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X

- Definition

Proceeds from sale of rights and intellectual property.

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
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X

- Details

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X

- Definition

Represents amount of the transaction price received pursuant to the contractual requirements prior to FDA approval. This amount was recorded as a deferred gain within current liabilities and recorded into income upon FDA approval.

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of gain (loss) on sale or disposal of intangible assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.7,9)

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

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