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Share-based Compensation - Narrative (Detail) - Amended And Restated Equity Plan - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 0.6 $ 0.6
Common Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period (in shares) 118,059  
Grants in period, fair value $ 1.3  
Bonus aggregate target payout, if circumstances met $ 2.4  
Common Shares | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Bonus aggregate target payout, performance percentage 0.00%  
Common Shares | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Bonus aggregate target payout, performance percentage 200.00%