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Borrowings and Credit Arrangements - Company's Borrowings (Detail) (USD $) | Mar. 28, 2015 | Sep. 27, 2014
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Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | $ 581,700,000us-gaap_LongTermDebtCurrent | $ 114,500,000us-gaap_LongTermDebtCurrent
Convertible Notes Payable, Current | 417,300,000us-gaap_ConvertibleNotesPayableCurrent | 0us-gaap_ConvertibleNotesPayableCurrent
Convertible Notes | 844,000,000us-gaap_ConvertibleLongTermNotesPayable | 1,235,600,000us-gaap_ConvertibleLongTermNotesPayable
Total long-term debt obligations | 3,358,100,000us-gaap_LongTermDebtNoncurrent | 4,153,200,000us-gaap_LongTermDebtNoncurrent
Total debt obligations | 3,939,800,000us-gaap_LongTermDebt | 4,267,700,000us-gaap_LongTermDebt
Term Loan A |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 149,500,000us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember | 99,600,000us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember
Long-term debt obligations, net of debt discount | 697,600,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember | 796,700,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanAMember
Term Loan B |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 14,900,000us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 14,900,000us-gaap_LongTermDebtCurrent / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Long-term debt obligations, net of debt discount | 816,500,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember | 1,120,900,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = holx_TermLoanBMember
Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt obligations, net of debt discount | $ 1,000,000,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember | $ 1,000,000,000holx_LongTermDebtObligationsWithoutConvertibleNotes / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember

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