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Restructuring and Divestiture Charges - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended	3 Months Ended
	Sep. 27, 2014	Dec. 27, 2014	Sep. 27, 2014	Dec. 28, 2013	Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]
Estimated aggregate severance charges		$ 1,800,000us-gaap_RestructuringAndRelatedCostExpectedCost1
Gain (Loss) on Disposition of Business	5,300,000us-gaap_GainLossOnSaleOfBusiness
Restructuring | Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Severance charges		2,500,000us-gaap_SeveranceCosts1 / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Share Based Compensation Expense Included Other Restructuring Costs		100,000holx_ShareBasedCompensationExpenseIncludedOtherRestructuringCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Workforce reductions		7,300,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Facility closure costs		700,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Restructuring | Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			42,200,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Facility closure costs			600,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Non-cash impairment charge			3,100,000us-gaap_RestructuringCostsAndAssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Consolidation of Diagnostics Operations | Molecular Diagnostics Operations
Restructuring Cost and Reserve [Line Items]
Severance and benefits and facility closure costs		500,000holx_Severanceandbenefitsandfacilityclosurecosts / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_MolecularDiagnosticsOperationsMember
Severance charges			3,000,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_MolecularDiagnosticsOperationsMember	800,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_MolecularDiagnosticsOperationsMember
Consolidation of Diagnostics Operations | Restructuring | Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		100,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Facility closure costs		400,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Consolidation of Diagnostics Operations | Restructuring | Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			2,900,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Facility closure costs			0holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Non-cash impairment charge			0us-gaap_RestructuringCostsAndAssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_ConsolidationOfDiagnosticsOperationsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Fiscal 2014 Actions
Restructuring Cost and Reserve [Line Items]
Severance charges			16,600,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember	6,300,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember
Compensation charges			1,800,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember	400,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember
Fiscal 2014 Actions | Jack Cumming
Restructuring Cost and Reserve [Line Items]
Severance charges				6,600,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = us-gaap_PresidentMember
Compensation charges				4,400,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_TitleOfIndividualAxis = us-gaap_PresidentMember
Fiscal 2014 Actions | Restructuring | Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions		4,500,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Facility closure costs		200,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Fiscal 2014 Actions | Restructuring | Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			29,500,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Facility closure costs			0holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Non-cash impairment charge			0us-gaap_RestructuringCostsAndAssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_RestructuringActionTwoThousandFourteenMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Other Operating Cost Reductions
Restructuring Cost and Reserve [Line Items]
Severance charges			8,700,000us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember		0us-gaap_SeveranceCosts1 / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember
Estimated aggregate severance charges				9,500,000us-gaap_RestructuringAndRelatedCostExpectedCost1 / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember
Number of employees affected for severance benefits				95us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember
Other Operating Cost Reductions | Restructuring | Fiscal 2015 Charges
Restructuring Cost and Reserve [Line Items]
Severance and benefits and facility closure costs		300,000holx_Severanceandbenefitsandfacilityclosurecosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Workforce reductions		200,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Facility closure costs		100,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_Fiscal2015ChargesMember
Other Operating Cost Reductions | Restructuring | Fiscal 2014 Charges
Restructuring Cost and Reserve [Line Items]
Workforce reductions			9,800,000holx_ReductionOfWorkforceExpenses / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Facility closure costs			600,000holx_FacilityClosureCosts / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember
Non-cash impairment charge			$ 3,100,000us-gaap_RestructuringCostsAndAssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember	$ 3,100,000us-gaap_RestructuringCostsAndAssetImpairmentCharges / us-gaap_IncomeStatementLocationAxis = us-gaap_RestructuringChargesMember / us-gaap_RestructuringCostAndReserveAxis = holx_OtherOperatingCostReductionsMember / us-gaap_RestructuringPlanAxis = holx_YearTwoThousandFourteenMember

X

- Definition

Represents charges incurred to close or restructure a facility in connection with an exit or disposal activity. Such costs include clean-up costs and lease obligations. Costs are recorded as the activities are incurred except for lease obligation charges, which are recorded upon termination of the lease obligation or at the cease use date.

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Represents severance and related benefit charges for the termination of employees under an exit or disposal activity. Charges are recorded either as one-time termination benefits, which are recognized ratable over the required service period to receive such benefit, or under an ongoing benefit plan arrangement once the charge is probable and reasonably estimable.

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severance and benefits and facility closure costs

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Share based compensation expense included other restructuring costs.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

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Amount expected to be recognized in earnings for the specified restructuring cost.

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The expected number of positions to be eliminated as a result of restructuring activities.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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