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Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) (USD $) In Millions, unless otherwise specified	Mar. 28, 2015
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 1,695.8us-gaap_ConvertibleDebtFairValueDisclosures
2010 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	652.3us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_FinancialInstrumentAxis = holx_TwoThousandAndTenNotesMember
2012 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	613.3us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_FinancialInstrumentAxis = holx_TwoThousandAndTwelveNotesMember
2013 Notes
Estimated Fair Value Of Financial Instruments [Line Items]
Estimated fair values of debt instruments	$ 430.2us-gaap_ConvertibleDebtFairValueDisclosures / us-gaap_FinancialInstrumentAxis = holx_TwoThousandAndThirteenNotesMember

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Convertible Security

-URI http://asc.fasb.org/extlink&oid=6509036

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