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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 28, 2020
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Changes in the carrying amount of goodwill        
Goodwill, Gross   $ 161,100,000 $ 164,921,000 $ 164,625,000
Accumulated goodwill impairment   (71,900,000) (76,417,000) (76,417,000)
Balance at the beginning of the period, Goodwill, net $ 88,504,000 88,504,000 88,208,000  
Foreign currency translation adjustment and other   683,000 296,000  
Balance at the end of the period, Goodwill, net   89,187,000 88,504,000 88,208,000
Decrease to goodwill from dissolution and final liquidation of GNU123 Liquidating Corporation $ 4,500,000      
Goodwill impairment loss   0 0 0
Impairment of intangible assets   $ 0 $ 0 $ 0