Employee Benefit Plans (Defined Benefit Retirement Plan Assets Subject To Fair Value Measurements) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	$ 23,481	$ 23,871	$ 22,886
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	23,481	23,871
Mutual Fund | Level 3
Defined Benefit Plan Disclosure [Line Items]
Defined benefit retirement plan assets	$ 0	$ 0