REVENUE - Narrative (Details) - USD ($) $ in Thousands	Dec. 28, 2017	Jun. 27, 2018	Dec. 27, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other long-term liabilities		$ 7,256	$ 2,553
Other current liabilities		7,655	$ 7,937
Revenue, remaining performance obligation		$ 10,557
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Opening equity	$ 1,574
Other long-term liabilities	1,769
Other current liabilities	68
Accounts receivable	100
Retained Earnings | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Opening equity	1,135
Noncontrolling Interest | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Opening equity	$ 439