Benefit Plans - Amounts Recognized in Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ 6,900	$ 14,932	$ 2,757
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	5,643	5,707	6,084
Expected return on plan assets	(6,112)	(6,443)	(6,524)
Amortization of net loss	4,787	3,567	2,804
Net periodic benefit cost	4,318	2,831	2,364
Net loss	15,716	11,797	9,261
Amortization of net loss	(4,787)	(3,567)	(2,804)
Total recognized in other comprehensive income	10,929	8,230	6,457
Total recognized in net periodic pension benefit cost and other comprehensive income	$ 15,247	$ 11,061	$ 8,821