Retirement Plans	12 Months Ended
	Sep. 27, 2020
Retirement Benefits [Abstract]
Retirement Plans	Retirement PlansWe have defined contribution plans in various countries where we have employees. This primarily includes 401(k) plans in the United States. For fiscal 2020, 2019 and 2018, employer contributions to the U.S. plans were $25.0 million, $23.3 million and $22.4 million, respectively.Additionally, we have established a non-qualified deferred compensation plan for certain key employees and non-employee directors. These eligible employees and non-employee directors may elect to defer the receipt of salary, incentive payments, restricted stock, PSU and RSU awards, and non-employee director fees. The plan is accounted for in accordance with applicable authoritative guidance on accounting for deferred compensation arrangements where amounts earned are held in a rabbi trust and invested. Employee deferrals are deposited into a rabbi trust, and the funds are generally invested in individual variable life insurance contracts that we own and are specifically designed to informally fund savings plans of this nature. At September 27, 2020 and September 29, 2019, the consolidated balance sheets reflect assets of $35.1 million and $30.4 million, respectively, related to the deferred compensation plan in "Other long-term assets," and liabilities of $35.0 million and $29.5 million, respectively, related to the deferred compensation plan in "Other long-term liabilities." The net gains and losses related to the deferred compensation plan are reported as part of “Selling, general and administrative expenses” in our consolidated statements of income. These related net gains and losses were immaterial for fiscal 2020, 2019 and 2018.