EMPLOYEE BENEFIT PLANS - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Amounts recognized in accumulated other comprehensive income (loss)
Net actuarial loss	$ 94,705	$ 123,743
Net prior service cost (credit)	(3,203)	(3,300)
Net amount recognized	$ 91,502	$ 120,443