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Revenues (Revenues Disaggregated by Geographic Region) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2021
Oct. 02, 2020
Jul. 03, 2020
Apr. 03, 2020
Jan. 03, 2020
Sep. 27, 2019
Jun. 28, 2019
Mar. 29, 2019
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Disaggregation of Revenue [Line Items]                      
Total revenues $ 270,052 $ 231,092 $ 259,479 $ 226,915 $ 240,310 $ 271,703 $ 240,275 $ 215,487 $ 987,538 $ 967,775 $ 853,826
U.S.                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 752,890 770,244 632,927
Europe                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 151,631 152,771 182,879
Japan                      
Disaggregation of Revenue [Line Items]                      
Total revenues                 $ 83,017 $ 44,760 $ 38,020