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Stock-Based Compensation Plans - Summary of RSU Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Weighted average grant date fair value    
Granted, Weighted average grant date fair value (dollars per share) $ 1.69 $ 1.50
Restricted Stock Units (RSUs)    
Shares    
Balance at the beginning of period, Shares 4,412  
Granted, Shares 2,445  
Effect of vesting multiplier, Shares 216  
Vested, Shares (1,734)  
Forfeited or expired, Shares (564)  
Balance at the end of period, Shares 4,775 4,412
Weighted average grant date fair value    
Balance at the beginning of period, Weighted average grant date fair value (dollars per share) $ 7.53  
Granted, Weighted average grant date fair value (dollars per share) 16.23  
Effect of vesting multiplier, Weighted average grant date fair value (dollars per share) 0.00  
Vested, Weighted average grant date fair value (dollars per share) 8.10  
Forfeited or expired, Weighted average grant date fair value (dollars per share) 7.27  
Balance at the end of period, Weighted average grant date fair value (dollars per share) $ 12.23 $ 7.53