SIGNIFICANT ACCOUNTING POLICIES - PP&E, Intangibles (Details)	3 Months Ended		9 Months Ended
	Sep. 25, 2016 USD ($)	Sep. 27, 2015 USD ($)	Sep. 25, 2016 USD ($) segment company	Sep. 27, 2015 USD ($)
Property, plant and equipment
Accelerated depreciation incurred	$ 300,000	$ 4,900,000	$ 6,900,000	$ 6,700,000
Depreciation expense	8,561,000	15,224,000	$ 33,559,000	39,606,000
Assets held for sale
Number of media companies with assets held for sale | company			2
Intangible Assets and Goodwill
Goodwill impairment and other asset write-downs	330,000		$ 330,000	300,429,000
Goodwill impairment charge	0		0	290,900,000
Impairment charge of newspaper masthead	0		0	9,500,000
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