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PROPERTY AND EQUIPMENT, NET (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 221,006 $ 210,191
Less accumulated depreciation and amortization (163,335) (150,028)
Property and equipment, net 57,671 60,163
Buildings and land    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 41,300 37,672
Computers and software    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 154,724 149,835
Furniture and equipment    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 16,632 15,527
Construction in progress    
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 8,350 $ 7,157