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v2.4.1.9

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 | $ 3,100,000 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |
Cost-method equity investments in non-publicly traded securities |  | 5,200,000 us-gaap_CostMethodInvestments | 5,200,000 us-gaap_CostMethodInvestments
Equity Security Other Than Temporary Impairment Charge | 700,000 holx_EquitySecurityOtherThanTemporaryImpairmentCharge |  |
Credit Agreement |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Borrowed principal under credit agreement |  | 1,720,000,000 holx_PrincipalAmountOfBorrowings / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |
Senior Notes |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |
Fair value of debt instrument |  | $ 1,040,000,000 us-gaap_DebtInstrumentFairValue / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |

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