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PROPERTY AND EQUIPMENT, NET (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 27, 2014
Dec. 27, 2013
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 144,898 $ 142,173
Less accumulated depreciation and amortization (91,717) (87,700)
Property and equipment, net 53,181 54,473
Buildings and land
   
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 27,441 27,008
Computers and software
   
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 103,075 101,852
Furniture and equipment
   
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross 10,855 10,444
Construction in progress
   
Property and Equipment, Net, by Type [Abstract]    
Property and equipment, gross $ 3,527 $ 2,869