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Basis of Presentation and General Information (Narrative) (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 25, 2020
Jun. 26, 2020
Sep. 27, 2019
Sep. 25, 2019
Jun. 26, 2020
Sep. 25, 2020
Sep. 27, 2019
Sep. 25, 2019
Dec. 27, 2019
Dec. 28, 2018
Basis Of Presentation And General Information [Line Items]                    
Revenue recognized as a result of change in contract liability $ 6,000,000.0   $ 3,800,000     $ 15,800,000 $ 12,000,000.0      
Deferred commissions                 $ 1,600,000 $ 1,200,000
Commissions expense 300,000     $ 400,000   1,200,000   $ 900,000    
Impairment loss recognized to capitalization of deferred commission 0         0        
Income tax expense $ 1,362,000   $ 2,427,000     $ 2,312,000 $ 6,481,000      
Effective tax rate expense (benefit) (30.00%)   26.00%     33.00% 24.00%      
Restructuring costs   $ 5,034,000             $ 3,300,000  
ASU 2016-13 [Member]                    
Basis Of Presentation And General Information [Line Items]                    
Change in accounting principle, accounting standards update, adoption date Jan. 31, 2020         Jan. 31, 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     $ 5,000,000.0          
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