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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
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Assets: |
Assets measured at fair value on a recurring basis | $ 38.9 us-gaap_InvestmentsFairValueDisclosure
Liabilities: |
Liabilities measured at fair value on a recurring basis | 37.1 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
Equity securities |
Assets: |
Assets measured at fair value on a recurring basis | 29.5 us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_EquitySecuritiesMember
Mutual funds |
Assets: |
Assets measured at fair value on a recurring basis | 9.4 us-gaap_InvestmentsFairValueDisclosure / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_MutualFundsMember
Deferred compensation liabilities |
Liabilities: |
Liabilities measured at fair value on a recurring basis | 37.1 us-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 | 38.9 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Liabilities: |
Liabilities measured at fair value on a recurring basis | 37.1 us-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 | 29.5 us-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 | 9.4 us-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 | 37.1 us-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 | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Liabilities: |
Liabilities measured at fair value on a recurring basis | 0 us-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 | 0 us-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 | 0 us-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 | 0 us-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 | 0 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Liabilities: |
Liabilities measured at fair value on a recurring basis | 0 us-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 | 0 us-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 | 0 us-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 | $ 0 us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = holx_DeferredCompensationLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition 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 + Details
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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 + Details
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