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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions | Dec. 25, 2021 | Sep. 25, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ 248.7 | $ 313.0
Total long-term debt obligations | 2,819.6 | 2,712.2
Total debt obligations | 3,068.3 | 3,025.2
Term Loan |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 1,489.1 | 1,382.3
Accounts Receivable Securitization |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 248.5 | 248.5
Other Debt Obligations |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | 0.2 | 64.5
2028 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | 395.5 | 395.4
2029 Senior Notes |  |
Debt Instrument [Line Items] |  |
Long term debt obligations. excluding convertible notes | $ 935.0 | $ 934.5

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