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Basis of Presentation and General Information (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 01, 2021
Jan. 01, 2021
Sep. 25, 2020
Jun. 26, 2020
Oct. 01, 2021
Sep. 25, 2020
Dec. 27, 2019
Basis Of Presentation And General Information [Line Items]              
Revenue recognized as a result of change in contract liability $ 1,700,000   $ 6,000,000.0   $ 7,700,000 $ 15,800,000  
Deferred commissions   $ 1,500,000         $ 1,600,000
Commissions expense 200,000   $ 300,000   800,000 $ 1,200,000  
Impairment loss recognized to capitalization of deferred commission $ 0       $ 0    
ASU 2019-12 [Member]              
Basis Of Presentation And General Information [Line Items]              
Change in accounting principle, accounting standards update, adoption date Dec. 15, 2020       Dec. 15, 2020    
Change in accounting principle, accounting standards update, adopted true       true    
Change in accounting principle, accounting standards update, immaterial effect true       true    
COVID-19 [Member]              
Basis Of Presentation And General Information [Line Items]              
Global workforce reduced, percentage       10.00%      
Restructuring costs       $ 5,000,000.0      
Asset impairment charges   $ 3,900,000          
Minimum [Member]              
Basis Of Presentation And General Information [Line Items]              
Business relationship agreement period         6 months    
Maximum [Member]              
Basis Of Presentation And General Information [Line Items]              
Business relationship agreement period         12 months    
Customer contract period         12 months