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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Apr. 01, 2017 | Sep. 24, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | $ 1,049.4 | $ 296.0
Convertible Notes | 782.8 | 12.2
Convertible Notes | 0.0 | 763.5
Total long-term debt obligations | 2,233.8 | 3,049.4
Total debt obligations | 3,283.2 | 3,345.4
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 102.6 | 83.8
Long-term debt obligations, net of debt discount | 1,254.1 | 1,308.2
Accounts Receivable Securitization [Member] |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 164.0 | 200.0
2022 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt obligations, net of debt discount | $ 979.7 | $ 977.7

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