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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 |  |  | $ 6.7 us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 2.9 us-gaap_GainsLossesOnExtinguishmentOfDebt
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  | 16.7 us-gaap_AmortizationOfFinancingCostsAndDiscounts | 19.7 us-gaap_AmortizationOfFinancingCostsAndDiscounts
Number of financial ratio covenants |  |  | 2 holx_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 |  |  | 17.6 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 20.4 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  | 3.1 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 3.3 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  |  | 16.0 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 16.0 us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  | 0.4 us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 0.4 us-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 | 300.0 holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 100.0 holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember |  |
Debt extinguishment loss |  |  | $ 6.7 us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | $ 2.9 us-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 |

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- Definition Debt instrument prepaid principal amount. + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the interest rate in effect as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Financial Ratio Covenants + References No definition available. + Details
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Namespace Prefix: | holx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

X
- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- 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) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- 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 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Details
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- Details
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Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Period Type: |