SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Non controlling interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ (3,523)	$ (519)	$ 468
Noncontrolling Interest, Ownership Percentage by Parent	72.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	28.00%
CHS-JV
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 3,506
Other
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	(115)	(135)	(369)
Noncontrolling Interests - Non-redeemable
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	3,391	(135)	(369)
Noncontrolling interest - redeemable - Imperium
Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interests	$ 132	$ 654	$ (99)