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Goodwill - Changes in Goodwill - (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 21, 2018
Dec. 29, 2018
Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Payments to Acquire Businesses, Gross $ 4,000    
Goodwill [Roll Forward]      
Goodwill, beginning of period   $ 20,617 $ 19,780
Goodwill as a result of acquisitions $ 3,400 3,402 0
Foreign currency translation adjustment   (722) 837
Goodwill, end of period   $ 23,297 $ 20,617