SIGNIFICANT ACCOUNTING POLICIES - PP&E, Intangibles (Details)	3 Months Ended		6 Months Ended
	Jul. 01, 2018 USD ($)	Jun. 25, 2017 USD ($)	Jul. 01, 2018 USD ($) segment company property	Jun. 25, 2017 USD ($)
Property, plant and equipment
Other asset write-downs			$ 59,000	$ 1,957,000
Depreciation expense	$ 7,295,000	$ 7,531,000	$ 14,492,000	15,252,000
Assets held for sale
Number of media companies with assets held for sale | company			2
Facilities with reduced carrying value | property			1
Impairment charge of assets held for sale			$ 100,000
Gain (loss) on sale of property	0
Intangible assets:
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
Financial Obligations
Increase in financing obligations	14,600,000
Segment reporting
Number of operating segments | segment			2
Other asset write-downs
Property, plant and equipment
Write-down of non-newsprint inventory	$ 0		$ 0	$ 2,000,000