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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	Dec. 30, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Current portion of long-term debt	$ 37.4	$ 287.0
Total long-term debt obligations	2,522.7	2,531.2
Total debt obligations	2,560.1	2,818.2
Term Loan
Debt Instrument [Line Items]
Current portion of long-term debt	37.4	287.0
Long term debt obligations. excluding convertible notes	1,186.4	1,195.6
2028 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	397.0	396.8
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes	$ 939.3	$ 938.8

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