Employee Benefit Plans (Net Periodic Benefit Cost For Defined Benefit Retirement Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 1,271	$ 1,282	$ 1,426
Interest cost	612	640	431
Expected return on plan assets	(1,271)	(1,270)	(1,085)
Net amortization and deferral	542	526	996
Net periodic benefit cost	$ 1,154	$ 1,178	$ 1,768