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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 24, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | $ 1,150.8 | $ 296.0
Convertible Notes | 484.5 | 12.2
Convertible Notes | 0.0 | 763.5
Total long-term debt obligations | 2,172.1 | 3,049.4
Total debt obligations | 3,322.9 | 3,345.4
Term Loan |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 121.3 | 83.8
Long-term debt obligations, net of debt discount | 1,190.5 | 1,308.2
Revolver |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 345.0 | 0.0
Securitization Program |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 200.0 | 200.0
2022 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long-term debt obligations, net of debt discount | $ 981.6 | $ 977.7

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