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