XML 69 R55.htm IDEA: XBRL DOCUMENT v3.20.4
Goodwill and Purchased Intangible Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 26, 2020
Dec. 31, 2019
Goodwill Roll Forward    
Beginning balance $ 307,148 $ 22,495
Acquired goodwill (Note 3)   284,653
Goodwill adjustments (Note 3) (516)  
Ending balance $ 306,632 $ 307,148