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Pension, Postretirement, and Postemployement Obligations (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 26, 2016
Jun. 28, 2015
Jun. 26, 2016
Jun. 28, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]        
Pension Contributions $ 826,000   $ 2,314,000 $ 1,565,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year     2,280,000  
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 $ 226,000 147,000 678,000
Defined Benefit Plan, Interest Cost 1,515,000 1,859,000 4,545,000 5,577,000
Defined Benefit Plan, Expected Return on Plan Assets (2,174,000) (2,466,000) (6,522,000) (7,398,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) 599,000 420,000 1,797,000 1,260,000
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 34,000 34,000 102,000 102,000
Defined Benefit Plan, Net Periodic Benefit Cost (45,000) 5,000 (135,000) 15,000
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 48,000 117,000
Defined Benefit Plan, Interest Cost 156,000 211,000 468,000 633,000
Defined Benefit Plan, Expected Return on Plan Assets (331,000) (361,000) (993,000) (1,083,000)
Defined Benefit Plan, Amortization of Net Gains (Losses) (273,000) (347,000) (819,000) (1,041,000)
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 365,000 365,000 1,095,000 1,095,000
Defined Benefit Plan, Net Periodic Benefit Cost $ (797,000) $ (823,000) $ (2,391,000) $ (2,469,000)