Pension, Postretirement, and Postemployement Obligations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 25, 2018	Mar. 26, 2017	Mar. 25, 2018	Mar. 26, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer			4940
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Service Cost	$ 12	$ 21	$ 24	$ 42
Defined Benefit Plan, Interest Cost	1,438	1,349	2,876	2,698
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(1,983)	(1,969)	(3,966)	(3,938)
Defined Benefit Plan, Amortization of Gain (Loss)	506	736	1,012	1,472
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(34)	(34)	(68)	(68)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(61)	103	(122)	206
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	(2,031)	(3,741)	(2,031)	(3,741)
Defined Benefit Plan, Service Cost	0	9	0	12
Defined Benefit Plan, Interest Cost	90	110	181	232
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(270)	(264)	(540)	(528)
Defined Benefit Plan, Amortization of Gain (Loss)	(246)	(243)	(492)	(480)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	(196)	(365)	(392)	(730)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (2,653)	$ (4,494)	$ (3,274)	$ (5,235)