Supplemental Financial Information - Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Condensed Financial Information [Abstract]
Interest cost	$ 1,237	$ 1,512	$ 3,711	$ 4,535
Expected return on plan assets	(1,846)	(1,905)	(5,538)	(5,714)
Amortization of prior loss	430	689	1,289	2,068
Net periodic benefit cost	(179)	296	(538)	889
Amortization of prior loss, recognized in other comprehensive income	430	689	1,289	2,068
Total recognized in net periodic pension benefit cost and other comprehensive income	$ (609)	$ (393)	$ (1,827)	$ (1,179)