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Pension, Postretirement, and Postemployement Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 24, 2018
Jun. 25, 2017
Jun. 24, 2018
Jun. 25, 2017
Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]          
Defined Benefit Plan, Plan Assets, Contributions by Employer 780       4170
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 $ 36 $ 63  
Defined Benefit Plan, Interest Cost 1,438 1,349 4,314 4,047  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (1,983) (1,969) (5,949) (5,907)  
Defined Benefit Plan, Amortization of Gain (Loss) 506 736 1,518 2,208  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (34) (34) (102) (102)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) (61) 103 (183) 309  
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 0 (2,031) (3,741)  
Defined Benefit Plan, Service Cost 0 0 0 12  
Defined Benefit Plan, Interest Cost 90 91 271 323  
Defined Benefit Plan, Expected Return (Loss) on Plan Assets (270) (264) (810) (792)  
Defined Benefit Plan, Amortization of Gain (Loss) (246) (254) (738) (734)  
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (196) (365) (588) (1,095)  
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (622) $ (792) $ (3,896) $ (6,027)