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Investments - Equity Method Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 24, 2017
Jun. 25, 2017
Dec. 25, 2016
Jun. 26, 2016
Mar. 27, 2016
Jun. 25, 2017
Jun. 26, 2016
Schedule of Equity Method Investments [Line Items]              
Investments in joint ventures   $ 16,688,000 $ 15,614,000     $ 16,688,000  
Loss from joint ventures   266,000   $ 412,000   93,000 $ 42,308,000
Distributions received   0   0   0 0
Newsprint and supercalendered paper purchased from the Paper Mills   $ 2,400,000   $ 3,600,000   $ 5,400,000 $ 6,600,000
Donohue Malbaie Inc.              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   49.00%       49.00%  
Madison Paper Industries              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   40.00%       40.00%  
Noncontrolling interest, ownership percentage by parent   10.00%       10.00%  
Investment in Madison         $ 0    
Gain on sale of non-hydro power assets     $ 3,900,000        
Women in the World Media, LLC              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   30.00%       30.00%  
Madison Paper Industries Owned Consolidated Subsidiary              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   80.00%       80.00%  
Noncontrolling interest, ownership percentage by parent   20.00%       20.00%  
Ownership of Madison Paper Industries by Consolidated Subsidiary              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   50.00%       50.00%  
Accrued Expenses and Other              
Schedule of Equity Method Investments [Line Items]              
Obligation to fund losses of equity method investment   $ 29,200,000       $ 29,200,000  
UPM-Kymmene | Madison Paper Industries              
Schedule of Equity Method Investments [Line Items]              
Equity method investment, ownership percentage   60.00%       60.00%  
Paper Mill Closure | Madison Paper Industries              
Schedule of Equity Method Investments [Line Items]              
Loss from joint ventures         $ (41,400,000)    
Forecast | Minimum | Madison Paper Industries              
Schedule of Equity Method Investments [Line Items]              
Gain on sale of non-hydro power assets $ 20,000,000            
Forecast | Maximum | Madison Paper Industries              
Schedule of Equity Method Investments [Line Items]              
Gain on sale of non-hydro power assets $ 25,000,000