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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
	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

X

- 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

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