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v2.4.1.9

Fair Value Measurements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 29, 2014 | Dec. 28, 2013 | Mar. 28, 2015 | Mar. 29, 2014 | Sep. 27, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Impairment of Intangible Assets, Finite-lived | $ 27,100,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived |  |  |  |
Asset impairment charges | 1,500,000us-gaap_AssetImpairmentCharges |  | 0us-gaap_AssetImpairmentCharges | 33,300,000us-gaap_AssetImpairmentCharges |
Asset impairment charge |  | 3,100,000us-gaap_ImpairmentOfLongLivedAssetsHeldForUse |  |  |
Cost Method Investments |  |  | 4,400,000us-gaap_CostMethodInvestments |  | 5,200,000us-gaap_CostMethodInvestments
Equity Security Other Than Temporary Impairment Charge | 3,000,000holx_EquitySecurityOtherThanTemporaryImpairmentCharge |  |  | 3,700,000holx_EquitySecurityOtherThanTemporaryImpairmentCharge |
Borrowed principal under credit agreement |  |  | 1,000,000,000holx_PrincipalAmountOfBorrowings |  |
Credit Agreement |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Borrowed principal under credit agreement |  |  | 1,690,000,000holx_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 |  |
Property, Plant and Equipment [Member] |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets to be Disposed of | 28,600,000us-gaap_ImpairmentOfLongLivedAssetsToBeDisposedOf / us-gaap_IncomeStatementLocationAxis = us-gaap_PropertyPlantAndEquipmentMember |  |  |  |
Cost of Sales [Member] |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Asset impairment charges | 300,000us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember |  |  |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |  |  |  |
Asset impairment charges | $ 1,200,000us-gaap_AssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29638308&loc=d3e40346-111594 + Details
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