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Fair Value Measurements - Changes in Fair Value of Recurring Fair Value Measurements Using Significant Unobservable Inputs (Level 3), Consisting of Contingent Consideration Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3.8	$ 86.4	$ 103.8
Contingent consideration recorded at acquisition	0	0.5	0
Fair value adjustments	0	11.3	38.5
Payments / Accruals	(3.8)	(94.4)	(55.9)
Balance at end of period	$ 0	$ 3.8	$ 86.4

X

- Definition

Business acquisition or combination contingent consideration at fair value.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Payment of contingent consideration liabilities recorded at fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	holx_
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X

- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

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X

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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