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Borrowings and Credit Arrangements - Company's Borrowings (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 25, 2021	Sep. 30, 2023	Sep. 24, 2022
Debt Instrument [Line Items]
Current debt obligations, net of debt discount		$ 287.0	$ 15.0
Long term debt obligations. excluding convertible notes		2,531.2	2,808.4
Total debt obligations		2,818.2	2,823.4
2018 Credit Agreement
Debt Instrument [Line Items]
Interest expense	$ 22.0
Term Loan
Debt Instrument [Line Items]
Current debt obligations, net of debt discount		287.0	15.0
Long term debt obligations. excluding convertible notes		1,195.6	1,475.7
2028 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes		396.8	396.1
2029 Senior Notes
Debt Instrument [Line Items]
Long term debt obligations. excluding convertible notes		$ 938.8	$ 936.6

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