SIGNIFICANT ACCOUNTING POLICIES - Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Changes in allowance for doubtful accounts
Balance at beginning of year	$ 3,008
Charged to costs and expenses	7,134	$ 8,995
Amounts written off	(8,388)	(9,212)
Balance at end of year	1,754	3,008
Newsprint, ink and other inventories
Inventory Write-down	$ 0	$ 0