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Pension, Postretirement, and Postemployement Obligations (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 26, 2017
Mar. 27, 2016
Mar. 26, 2017
Mar. 27, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension Contributions     $ 0 $ 1,488
Pension Plans, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Service Cost $ 21 $ 49 42 98
Defined Benefit Plan, Interest Cost 1,349 1,515 2,698 3,030
Defined Benefit Plan, Expected Return on Plan Assets (1,969) (2,174) (3,938) (4,348)
Defined Benefit Plan, Amortization of Net Gains (Losses) 736 599 1,472 1,198
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 34 34 68 68
Defined Benefit Plan, Net Periodic Benefit Cost 103 (45) 206 (90)
Other Postretirement Benefit Plans, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     0  
Defined Benefit Plan, Service Cost 9 16 12 32
Defined Benefit Plan, Interest Cost 110 156 232 312
Defined Benefit Plan, Expected Return on Plan Assets (264) (331) (528) (662)
Defined Benefit Plan, Amortization of Net Gains (Losses) (243) (273) (480) (546)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 365 365 730 730
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements and Curtailments (3,741) 0 (3,741) 0
Defined Benefit Plan, Net Periodic Benefit Cost $ (4,494) $ (797) $ (5,235) $ (1,594)