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

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