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Borrowings and Credit Arrangements - Interest Expense under Convertible Notes (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
Debt Conversion [Line Items]
Non-cash interest expense			$ 33.2us-gaap_AmortizationOfFinancingCostsAndDiscounts	$ 35.8us-gaap_AmortizationOfFinancingCostsAndDiscounts
Convertible Notes Payable
Debt Conversion [Line Items]
Amortization of debt discount	9.0us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	8.3us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	17.8us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	19.9us-gaap_AmortizationOfDebtDiscountPremium / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Amortization of deferred financing costs	0.4holx_AmortizationOfDeferredFinancingCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	0.4holx_AmortizationOfDeferredFinancingCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	0.9holx_AmortizationOfDeferredFinancingCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	1.0holx_AmortizationOfDeferredFinancingCosts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Principal accretion	4.0holx_BasePrincipalAmountForAccretionValue / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	3.8holx_BasePrincipalAmountForAccretionValue / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	7.9holx_BasePrincipalAmountForAccretionValue / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	7.6holx_BasePrincipalAmountForAccretionValue / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Non-cash interest expense	13.4us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	12.5us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	26.6us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	28.5us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
2.00% accrued interest (cash)	4.8us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	4.8us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	9.5us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	12.9us-gaap_InterestExpenseDebtExcludingAmortization / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Convertible Notes Interest Expense	2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	2.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember
Interest expense, net	$ 18.2us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	$ 17.3us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	$ 36.1us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember	$ 41.4us-gaap_InterestExpenseDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_ConvertibleNotesPayableMember

X

- Definition

The component of interest expense representing the periodic charge against earnings to reflect amortization of debt issuance costs over the life of the related debt instruments.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of principal accretion at the applicable rate pursuant to the terms of the debt agreement, which is recorded as interest expense.

+ References

No definition available.

+ Details

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

+ References

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- Definition

Amount of noncash expense included in interest expense to allocate debt discount and premium, and the costs to issue debt and obtain financing over the related debt instruments. Alternate captions include noncash interest expense.

+ References

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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