Supplemental Financial Information - Pension Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Jan. 04, 2020	Dec. 29, 2018
Condensed Financial Information [Abstract]
Interest cost	$ 1,237	$ 1,512
Expected return on plan assets	(1,846)	(1,905)
Amortization of prior loss	430	689
Net periodic benefit cost	(179)	296
Amortization of prior loss, recognized in other comprehensive income	430	689
Total recognized in net periodic pension benefit cost and other comprehensive income	$ (609)	$ (393)