Employee Benefit Plans (Defined Benefit Retirement Plan Assets Subject to Fair Value Measurements) (Details) - USD ($) $ in Thousands	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	$ 24,503	$ 23,481	$ 23,871
Mutual Fund | Level 1
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	0	0
Mutual Fund | Level 2
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	24,503	23,481
Mutual Fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	$ 0	$ 0