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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Aug. 01, 2015 | Jun. 27, 2015 | Sep. 27, 2014
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Current debt obligations, net of debt discount |  | $ 671.5 | $ 114.5
Convertible Notes Payable, Current |  | 421.8 | 0.0
Convertible Notes |  | 852.7 | 1,235.6
Total long-term debt obligations |  | 3,270.8 | 4,153.2
Total debt obligations |  | 3,942.3 | 4,267.7
Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Current debt obligations, net of debt discount |  | 74.7 | 0.0
Long-term debt obligations, net of debt discount |  | 1,418.1 | 0.0
Revolver [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Current debt obligations, net of debt discount |  | 175.0 | 0.0
Term Loan A |  |  |
Debt Instrument [Line Items] |  |  |
Current debt obligations, net of debt discount |  | 0.0 | 99.6
Long-term debt obligations, net of debt discount |  | 0.0 | 796.7
Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Current debt obligations, net of debt discount |  | 0.0 | 14.9
Long-term debt obligations, net of debt discount |  | 0.0 | 1,120.9
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt obligations, net of debt discount | $ 1,000.0 | $ 1,000.0 | $ 1,000.0

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