SIGNIFICANT ACCOUNTING POLICIES - Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 5,900	$ 6,040	$ 5,920
Charged to costs and expenses	8,181	9,305	8,481
Amounts written off	(9,630)	(9,229)	(8,361)
Disposition of discontinued operations		(216)
Balance at end of year	$ 4,451	5,900	$ 6,040
Newsprint, ink and other inventories
Inventory Write-down		$ 2,000