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Share-based Compensation - Narrative (Detail) - Amended and Restated Equity Plan - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 26, 2020
Jun. 27, 2020
Sep. 26, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, expense $ 1.4   $ 2.0
Share-based compensation, liability 2.0   2.0
Incremental compensation expense $ 2.6   $ 2.6
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%