Employee Benefit Plans (Net Periodic Benefit Cost for Defined Benefit Retirement Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Sep. 29, 2018
Retirement Benefits [Abstract]
Service cost	$ 1,676	$ 1,271	$ 1,282
Interest cost	299	612	640
Expected return on plan assets	(1,325)	(1,271)	(1,270)
Net amortization and deferral	1,226	542	526
Net periodic benefit cost	$ 1,876	$ 1,154	$ 1,178