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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Fiscal year (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 30, 2019
Dec. 30, 2018
Dec. 29, 2018
Long-term Line of Credit $ 650,000    
Retained Earnings (Accumulated Deficit) $ (237,596)   $ (240,104)
Minimum      
Length of fiscal year 364 days    
Length of fiscal quarter 91 days    
Maximum      
Length of fiscal year 371 days    
Length of fiscal quarter 98 days    
No. 2014-09      
Retained Earnings (Accumulated Deficit)   $ (500)