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Borrowings and Credit Arrangements - Company's Borrowings (Detail) (USD $) In Millions, unless otherwise specified	Dec. 27, 2014	Sep. 27, 2014
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	$ 139.4us-gaap_LongTermDebtCurrent	$ 114.5us-gaap_LongTermDebtCurrent
Convertible Notes	1,248.3us-gaap_ConvertibleLongTermNotesPayable	1,235.6us-gaap_ConvertibleLongTermNotesPayable
Total long-term debt obligations	3,815.4us-gaap_LongTermDebtNoncurrent	4,153.2us-gaap_LongTermDebtNoncurrent
Total debt obligations	3,954.8us-gaap_LongTermDebt	4,267.7us-gaap_LongTermDebt
Term Loan A
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	124.5us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember	99.6us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember
Long-term debt obligations, net of debt discount	747.1holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember	796.7holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember
Term Loan B
Debt Instrument [Line Items]
Current debt obligations, net of debt discount	14.9us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember	14.9us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Long-term debt obligations, net of debt discount	820.0holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember	1,120.9holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Senior Notes
Debt Instrument [Line Items]
Long-term debt obligations, net of debt discount	$ 1,000.0holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	$ 1,000.0holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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