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Fair Value Measurements - Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014
Assets:
Assets measured at fair value on a recurring basis	$ 38.9us-gaap_InvestmentsFairValueDisclosure
Liabilities:
Liabilities measured at fair value on a recurring basis	37.1us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
Equity securities
Assets:
Assets measured at fair value on a recurring basis	29.5us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember
Mutual funds
Assets:
Assets measured at fair value on a recurring basis	9.4us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_MutualFundsMember
Deferred compensation liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	37.1us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_DeferredCompensationLiabilitiesMember
Quoted Prices in Active Market for Identical Assets (Level 1)
Assets:
Assets measured at fair value on a recurring basis	38.9us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Liabilities:
Liabilities measured at fair value on a recurring basis	37.1us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Market for Identical Assets (Level 1) | Equity securities
Assets:
Assets measured at fair value on a recurring basis	29.5us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Market for Identical Assets (Level 1) | Mutual funds
Assets:
Assets measured at fair value on a recurring basis	9.4us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_MutualFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Quoted Prices in Active Market for Identical Assets (Level 1) | Deferred compensation liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	37.1us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_DeferredCompensationLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Significant Other Observable Inputs (Level 2)
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities:
Liabilities measured at fair value on a recurring basis	0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | Equity securities
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | Mutual funds
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_MutualFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Other Observable Inputs (Level 2) | Deferred compensation liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_DeferredCompensationLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant Unobservable Inputs (Level 3)
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Liabilities:
Liabilities measured at fair value on a recurring basis	0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) | Equity securities
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) | Mutual funds
Assets:
Assets measured at fair value on a recurring basis	0us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_MutualFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Significant Unobservable Inputs (Level 3) | Deferred compensation liabilities
Liabilities:
Liabilities measured at fair value on a recurring basis	$ 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_DeferredCompensationLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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Fair value of obligations measured on a recurring basis.

+ 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 (a),(b)

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

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Subparagraph a, f, g

-Article 7



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560

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