Summary of Significant Accounting Policies - Supplemental Cash Flow Statement Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021
Accounting Policies [Abstract]
Cash paid during the period for income taxes	$ 296,100,000	$ 36,200,000	$ 615,100,000
Cash paid during the period for interest	105,400,000	99,700,000	93,200,000
Contingent consideration recorded at acquisition	1,100,000	0	0
Proceeds from Income Tax Refunds	$ 39,300,000	$ 430,400,000	$ 13,700,000