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Commitments and Contingencies (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 20, 2020
USD ($)
Feb. 27, 2020
USD ($)
Nov. 08, 2017
USD ($)
Nov. 30, 2019
USD ($)
plaintiff
May 31, 2017
USD ($)
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Jul. 01, 2017
USD ($)
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Loss Contingencies [Line Items]                    
Charge for litigation settlement           $ 0 $ 0   $ 4,395 $ 0
1-800 Contacts Matter                    
Loss Contingencies [Line Items]                    
Amount of litigation settlement         $ 7,000          
Charge for litigation settlement               $ 7,000    
Percent of settlement award deposited in escrow account (percent)     50.00%              
Amount of settlement deposited in escrow account     $ 3,500              
1-800 Contacts Matter | Subsequent Event                    
Loss Contingencies [Line Items]                    
Percent of settlement award deposited in escrow account (percent) 50.00%                  
Amount of settlement deposited in escrow account $ 3,500                  
Wage and hours                    
Loss Contingencies [Line Items]                    
Gross settlement fund to be paid   $ 3,500                
Fair Labor Standards Act                    
Loss Contingencies [Line Items]                    
Number of former employees | plaintiff       6            
Fair Labor Standards Act | Maximum                    
Loss Contingencies [Line Items]                    
Amount of litigation settlement       $ 895