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Borrowings and Credit Arrangements - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended |
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Mar. 28, 2015 Financial_covenant | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014 | Dec. 24, 2014 | Feb. 26, 2014 | Oct. 31, 2013 | Dec. 27, 2014 | Dec. 28, 2013 | Sep. 27, 2014
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible Notes | $ 844,000,000us-gaap_ConvertibleLongTermNotesPayable |  | $ 844,000,000us-gaap_ConvertibleLongTermNotesPayable |  |  |  |  |  |  | $ 1,235,600,000us-gaap_ConvertibleLongTermNotesPayable
Debt extinguishment loss | 0us-gaap_GainsLossesOnExtinguishmentOfDebt | 4,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt | 6,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt | 7,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs |  |  | 33,200,000us-gaap_AmortizationOfFinancingCostsAndDiscounts | 35,800,000us-gaap_AmortizationOfFinancingCostsAndDiscounts |  |  |  |  |  |
Number of financial ratio covenants | 2holx_NumberofFinancialRatioCovenants |  |  |  |  |  |  |  |  |
Convertible Notes Payable, Current | 417,300,000us-gaap_ConvertibleNotesPayableCurrent |  | 417,300,000us-gaap_ConvertibleNotesPayableCurrent |  |  |  |  |  |  | 0us-gaap_ConvertibleNotesPayableCurrent
Credit Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of Debt Instruments | 2holx_NumberofDebtInstruments / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  |  |  |  |  |  |  |  |
Basis Point Reduction |  | 0.00%holx_BasisPointReduction / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  |  |  |  |  |  |  |
Weighted average interest rates, Borrowings outstanding under the credit agreement | 2.62%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  | 2.70%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  |  |  |  |  |  |
Interest expense | 14,400,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 19,200,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 31,900,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 39,600,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs | 2,700,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 3,200,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 5,800,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember | 6,500,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest expense | 16,000,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 16,000,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 32,000,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 32,000,000us-gaap_InterestExpenseDebt / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember |  |  |  |  |  |
Non-cash interest expense amortization of debt discount and deferred financing costs | 400,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 400,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 800,000us-gaap_AmortizationOfFinancingCostsAndDiscounts / us-gaap_DebtInstrumentAxis = us-gaap_SeniorNotesMember | 800,000us-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 |  |  |  |  | 300,000,000holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 25,000,000holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 100,000,000holx_DebtInstrumentPrepaidPrincipalAmount / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember |  |  |
Debt extinguishment loss |  | 4,400,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember |  |  |  |  |  | 6,700,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 3,000,000us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember |
Direct Third Party Costs Interest Expense |  | 1,000,000holx_DirectThirdPartyCostsInterestExpense / 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 |  |  | 1.92%holx_InterestRateBalanceSheet / us-gaap_DebtInstrumentAxis = holx_CreditAgreementMember / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember |  |  |  |  |  |  |
Two Thousand Ten Original Notes [Member] | Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Exceeds Percentage Of Conversion Price Of Common Stock |  |  | 130.00%holx_ExceedsPercentageOfConversionPriceOfCommonStock / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  |  |  |  |  |  |
Convertible Notes Payable, Current | 417,300,000.0us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  | 417,300,000.0us-gaap_ConvertibleNotesPayableCurrent / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  |  |  |  |  |  |
Debt Instrument, Face Amount | 450,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  | 450,000,000.0us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  |  |  |  |  |  |
Amount by which the if-converted value exceeds the principal amount | $ 200,000,000holx_Amountbywhichtheifconvertedvalueexceedstheprincipalamount / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  | $ 200,000,000holx_Amountbywhichtheifconvertedvalueexceedstheprincipalamount / us-gaap_DebtInstrumentAxis = holx_ConvertibleNotesMember / us-gaap_ShortTermDebtTypeAxis = holx_TwoThousandTenOriginalNotesMember |  |  |  |  |  |  |

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- Definition The holders of the 2007 Notes, 2010 Notes, 2012 Notes and 2013 Notes may convert the notes into shares of the Company's common stock at a conversion price of approximately $38.59 per share, $23.03 per share, $31.175 and $38.59 per share, respectively, subject to adjustment, prior to the close of business on September 15, 2037 for the 2007 and 2010 Notes, March 1, 2042 for the 2012 Notes and September 15, 2043 for the 2013 Notes upon: during any calendar quarter if the last reported sale price of the Company's common stock exceeds 130% of the conversion price for at least 20 trading days in the 30 consecutive trading days ending on the last trading day of the preceding calendar quarter. + References No definition available. + Details
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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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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + 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 210.5-02.22) -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 22 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- 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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- 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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