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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Dec. 28, 2024	Sep. 28, 2024
Debt Instrument [Line Items]
Current portion of long-term debt	$ 46.8	$ 37.5
Total long-term debt obligations	2,479.2	2,497.1
Total debt obligations	2,526.0	2,534.6
Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt	46.8	37.5
Long term debt obligations. excluding convertible notes	1,140.2	1,158.7
2028 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	397.7	397.6
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	$ 941.3	$ 940.8

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