Accrued Expenses and Other Long-Term Liabilities - Schedule of Accrued Expenses (Detail) - USD ($)	Sep. 26, 2020	Sep. 28, 2019
Accrued Expenses
Compensation and employee benefits	$ 262,700,000	$ 223,400,000
Income and other taxes	125,300,000	56,100,000
Operating lease liabilities (current)	23,500,000	0
Accrued interest	22,100,000	22,600,000
Other	114,000,000.0	128,800,000
Total	$ 547,600,000	$ 430,900,000