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Pension, Postretirement, and Postemployement Obligations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 27, 2016
Mar. 29, 2015
Mar. 27, 2016
Mar. 29, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension Contributions $ 744,000   $ 1,488,000 $ 705,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     2,759,000  
Pension Plans, Defined Benefit [Member]        
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Defined Benefit Plan, Service Cost 49,000 $ 226,000 98,000 452,000
Defined Benefit Plan, Interest Cost 1,515,000 1,859,000 3,030,000 3,718,000
Defined Benefit Plan, Expected Return on Plan Assets (2,174,000) (2,466,000) (4,348,000) (4,932,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) 599,000 420,000 1,198,000 840,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 34,000 34,000 68,000 68,000
Defined Benefit Plan, Net Periodic Benefit Cost (45,000) 5,000 (90,000) 10,000
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 16,000 39,000 32,000 78,000
Defined Benefit Plan, Interest Cost 156,000 211,000 312,000 422,000
Defined Benefit Plan, Expected Return on Plan Assets (331,000) (361,000) (662,000) (722,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) (273,000) (347,000) (546,000) (694,000)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 365,000 365,000 730,000 730,000
Defined Benefit Plan, Net Periodic Benefit Cost $ (797,000) $ (823,000) $ (1,594,000) $ (1,646,000)