XML 87 R73.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stock-Based Compensation - Stock Option Plan (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Dec. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 9.6 $ 8.6 $ 7.0
Intrinsic value of stock options 0.6 $ 15.8 $ 6.7
Stock-based compensation expense, unrecognized $ 1.8    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense, recognition period (in years) 1 year 8 months 12 days    
2015 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Plan expiration period (in years) 10 years    
Shares available for future grants (in shares) 1.5