Pension Plans and Other Postretirement Benefits - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 24, 2016
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 69	$ 96
Amortization of prior service credits	(124)	0
Amortization of net loss (gain)	(164)	(97)
Net periodic benefit cost	(219)	(1)
Pension Benefits [Member] | United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	944	1,041
Expected return on plan assets	(474)	(537)
Amortization of net loss (gain)	921	1,300
Net periodic benefit cost	$ 1,391	$ 1,804