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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Dec. 26, 2015 | Sep. 26, 2015
--- | --- | ---
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | $ 393.3 | $ 391.8
Convertible Notes Payable, Current | 143.6 | 142.2
Convertible Notes | 870.5 | 861.5
Total long-term debt obligations | 3,239.1 | 3,248.0
Total debt obligations | 3,632.4 | 3,639.8
Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 74.7 | 74.6
Long-term debt obligations, net of debt discount | 1,381.4 | 1,399.8
Revolver [Member] |  |
Debt Instrument [Line Items] |  |
Current debt obligations, net of debt discount | 175.0 | 175.0
2022 Notes [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt obligations, net of debt discount | $ 987.2 | $ 986.7

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