Pension, Postretirement, and Postemployement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 25, 2018	Mar. 31, 2019	Mar. 25, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	650
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	$ 9	$ 12	$ 18	$ 24
Defined Benefit Plan, Interest Cost	1,641	1,438	3,282	2,876
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(2,018)	(1,983)	(4,036)	(3,966)
Defined Benefit Plan, Amortization of Gain (Loss)	284	506	568	1,012
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(25)	(34)	(50)	(68)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(109)	(61)	(218)	(122)
Other Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment	0	(2,031)	0	(2,031)
Defined Benefit Plan, Interest Cost	103	90	206	181
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(270)	(270)	(540)	(540)
Defined Benefit Plan, Amortization of Gain (Loss)	(244)	(246)	(488)	(492)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(181)	(196)	(362)	(392)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (592)	$ (2,653)	$ (1,184)	$ (3,274)