Description of the Business and Significant Accounting Policies - Reclassifications Due to Covid-19 (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Jan. 01, 2021	Dec. 31, 2020	Jun. 28, 2020
Unusual or Infrequent Item, or Both [Line Items]
Receivables	$ 52,259		$ 34,445	$ 41,822
Inventories	46,983		47,479	45,580
Other current assets	40,298		26,747	22,515
Deferred revenue	$ 275,506	$ 183,400	$ 183,354	103,834
Pandemic COVID-19 | Other Assets
Unusual or Infrequent Item, or Both [Line Items]
Receivables				8,663
Inventories				9,159
Other current assets				763
Other current assets, excluding cash and cash equivalents				18,585
Pandemic COVID-19 | Non-Current Deferred Revenue
Unusual or Infrequent Item, or Both [Line Items]
Deferred revenue				$ 88,579