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SIGNIFICANT ACCOUNTING POLICIES - PP&E, Intangibles (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 25, 2017
USD ($)
Jun. 26, 2016
USD ($)
Jun. 25, 2017
USD ($)
segment
company
Jun. 26, 2016
USD ($)
Dec. 25, 2016
company
Property, plant and equipment          
Write-down of non-newsprint inventory     $ 1,957,000    
Accelerated depreciation incurred   $ 3,800,000   $ 6,600,000  
Depreciation expense $ 7,531,000 12,434,000 15,252,000 24,998,000  
Assets held for sale          
Impairment charge of assets held for sale     $ 0    
Number of media companies with assets held for sale | company     4   1
Intangible Assets and Goodwill          
Goodwill impairment charge 0 0 $ 0 0  
Impairment charge of newspaper masthead 0 0 0 0  
Intangible assets subject to amortization, net          
Impairment of long-lived assets subject to amortization $ 0 $ 0 $ 0 $ 0  
Segment reporting          
Number of operating segments | segment     2