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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Mar. 27, 2021 | Sep. 26, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt | $ 74.9 | $ 324.9 |
Total long-term debt obligations | 2,672.1 | 2,713.9 |
Total debt obligations | 2,747.0 | 3,038.8 |
Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt | 74.9 | 74.9 |
Long term debt obligations. excluding convertible notes | 1,343.6 | 1,379.9 |
Revolver |  |  |
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt | 0.0 | 250.0 | $ 750.0
2025 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt obligations. excluding convertible notes | 0.0 | 939.4 |
2028 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt obligations. excluding convertible notes | 395.0 | 394.6 |
2029 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long term debt obligations. excluding convertible notes | $ 933.5 | $ 0.0 |

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