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Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 02, 2016
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Changes in the carrying amount of goodwill        
Balance at the beginning of the period, Goodwill gross   $ 151,181 $ 153,387  
Goodwill adjustment related to acquisition   12,994    
Effect of foreign currency translation   1,242 (2,206)  
Balance at the end of the period, Goodwill gross $ 153,387 165,417 151,181 $ 153,387
Balance at the beginning of the period, Accumulated impairment losses   (76,417) (76,417)  
Balance at the end of the period, Accumulated impairment losses (76,417) (76,417) (76,417) (76,417)
Balance at the beginning of the period, Goodwill, net   74,764 76,970  
Balance at the end of the period, Goodwill, net 76,970 89,000 74,764 76,970
GNU goodwill impairment $ 4,500     4,524
Intangible assets impairment losses   $ 530 $ 0 $ 0