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Basis of Presentation and General Information (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 02, 2021
Jan. 01, 2021
Jun. 26, 2020
Jul. 02, 2021
Jun. 26, 2020
Dec. 27, 2019
Basis Of Presentation And General Information [Line Items]            
Revenue recognized as a result of change in contract liability $ 2,100,000   $ 5,400,000 $ 7,600,000 $ 9,800,000  
Deferred commissions   $ 1,500,000       $ 1,600,000
Commissions expense 300,000   $ 500,000 500,000 $ 900,000  
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