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SIGNIFICANT ACCOUNTING POLICIES - PP&E, Intangibles (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
segment
company
property
item
Sep. 30, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 30, 2018
USD ($)
Property, plant and equipment        
Depreciation expense $ 5,717,000   $ 7,197,000  
Assets held for sale        
Number of properties with assets held for sale | item 6      
Number of media companies with assets held for sale | company 3      
Facilities with reduced carrying value | property 1      
Impairment charge of assets held for sale $ 700,000      
Intangible assets:        
Goodwill impairment charge 0   0  
Impairment charge of newspaper masthead 0 $ 14,100,000 0 $ 37,200,000
Intangible assets subject to amortization, net        
Impairment of long-lived assets subject to amortization 0   0  
Impairments related to investments in unconsolidated companies, net $ 0   $ 0  
Segment reporting        
Number of operating segments | segment 2