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Borrowings and Credit Arrangements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		3 Months Ended
	Dec. 24, 2014	Oct. 31, 2013	Dec. 27, 2014	Dec. 28, 2013
Debt Instrument [Line Items]
Debt extinguishment loss			$ 6.7us-gaap_GainsLossesOnExtinguishmentOfDebt	$ 2.9us-gaap_GainsLossesOnExtinguishmentOfDebt
Non-cash interest expense amortization of debt discount and deferred financing costs			16.7us-gaap_AmortizationOfFinancingCostsAndDiscounts	19.7us-gaap_AmortizationOfFinancingCostsAndDiscounts
Number of financial ratio covenants			2holx_NumberofFinancialRatioCovenants
Credit Agreement
Debt Instrument [Line Items]
Weighted average interest rates, Borrowings outstanding under the credit agreement			2.77%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember	3.06%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Interest expense			17.6us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember	20.4us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Non-cash interest expense amortization of debt discount and deferred financing costs			3.1us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember	3.3us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Senior Notes
Debt Instrument [Line Items]
Interest expense			16.0us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember	16.0us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Non-cash interest expense amortization of debt discount and deferred financing costs			0.4us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember	0.4us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Senior note interest rate per year			6.25%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Term Loan B | Credit Agreement
Debt Instrument [Line Items]
Prepaid principal amount	300.0holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember	100.0holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Debt extinguishment loss			$ 6.7us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember	$ 2.9us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Interest rates under Term Loans			3.25%holx_InterestRateBalanceSheet / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Term Loan A | Credit Agreement
Debt Instrument [Line Items]
Interest rates under Term Loans			2.16%holx_InterestRateBalanceSheet / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember

X

- Definition

Debt instrument prepaid principal amount.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents the interest rate in effect as of the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Number of Financial Ratio Covenants

+ References

No definition available.

+ Details

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X

- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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X

- Definition

The average effective interest rate during the reporting period.

+ References

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-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Section S99

-Paragraph 1

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X

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ 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)

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

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-Name Regulation S-X (SX)

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Balance Type:	debit
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X

- Definition

The effective interest rate during the reporting period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section S99

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- Details

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- Details

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