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Performance-Based Restricted Stock Units Activity (Detail) - Performance-Based Restricted Stock Units (PRUs) - $ / shares
shares in Thousands
12 Months Ended
Dec. 28, 2020
Dec. 30, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Outstanding shares as of December 30, 2019 216    
Granted 303    
Vested (137)    
Forfeited / cancelled (22)    
Change in units due to annual performance achievement (71)    
Outstanding shares as of December 28, 2020 289 216  
Weighted Average Grant-Date Fair Value      
Outstanding shares as of December 30, 2019 $ 12.14    
Granted 10.57 $ 10.17 $ 19.59
Vested 12.82    
Forfeited / cancelled 10.89    
Change in units due to annual performance achievement 12.12    
Outstanding shares as of December 28, 2020 $ 10.27 $ 12.14