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Stock-Based Compensation - Stock-Based Compensation Expense in Consolidated Statements of Operations (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 13.7us-gaap_ShareBasedCompensation | $ 12.4us-gaap_ShareBasedCompensation | $ 25.8us-gaap_ShareBasedCompensation | $ 26.1us-gaap_ShareBasedCompensation
Cost of revenues |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 2.3us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_CostOfRevenueMember | 2.1us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_CostOfRevenueMember | 4.3us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_CostOfRevenueMember | 3.6us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_CostOfRevenueMember
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 2.2us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_ResearchAndDevelopmentMember | 2.2us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_ResearchAndDevelopmentMember | 4.1us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_ResearchAndDevelopmentMember | 4.1us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = holx_ResearchAndDevelopmentMember
Selling and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 2.3us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 2.4us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 4.3us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 4.1us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 6.9us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 5.7us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 13.0us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | 9.5us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember
Restructuring and divestiture |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 0us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember | $ 0us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember | $ 0.1us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember | $ 4.8us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + 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 (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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