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Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended
	Dec. 28, 2013	Dec. 27, 2014	Sep. 27, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Asset impairment charge	$ 3,100,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Cost-method equity investments in non-publicly traded securities		5,200,000us-gaap_CostMethodInvestments	5,200,000us-gaap_CostMethodInvestments
Equity Security Other Than Temporary Impairment Charge	700,000holx_EquitySecurityOtherThanTemporaryImpairmentCharge
Credit Agreement
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal under credit agreement		1,720,000,000holx_PrincipalAmountOfBorrowings / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument		$ 1,040,000,000us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember

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- Definition

Equity security other than temporary impairment charge.

+ References

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- Definition

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+ References

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- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

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

-Publisher FASB

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-Topic 210

-SubTopic 10

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Publisher FASB

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-Topic 825

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- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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