Supplemental Financial Information - Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 04, 2020	Mar. 30, 2019	Apr. 04, 2020	Mar. 30, 2019
Condensed Financial Information [Abstract]
Interest cost	$ 1,237	$ 1,511	$ 2,474	$ 3,023
Expected return on plan assets	(1,846)	(1,904)	(3,692)	(3,809)
Amortization of prior loss	429	690	859	1,379
Net periodic benefit cost	(180)	297	(359)	593
Amortization of prior loss, recognized in other comprehensive income	429	690	859	1,379
Total recognized in net periodic pension benefit cost and other comprehensive income	$ (609)	$ (393)	$ (1,218)	$ (786)