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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASU Update (Details) - USD ($) $ in Thousands	Mar. 28, 2018	Dec. 28, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement	$ (1,574)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement	$ (1,174)	$ 1,574
Other Noncurrent Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement		1,769
Current Liabilities
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement		68
Accounts Receivable
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement		$ 100

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