XML 116 R100.htm IDEA: XBRL DOCUMENT v3.22.0.1
Benefit Plans - Summary of Changes In Defined Benefit Plan Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2021
Sep. 27, 2020
Sep. 26, 2021
Sep. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]              
Beginning fair value of plan assets     $ 4,756 $ 4,089 $ 4,089    
Employer contributions $ 300 $ 294 417 477      
Ending fair value of plan assets         4,756 $ 4,089  
Amounts Recorded in Accumulated Other Comprehensive Loss              
Net actuarial loss         16    
Pension Plan [Member]              
Defined Benefit Plan Disclosure [Line Items]              
Beginning fair value of plan assets     $ 4,756 $ 4,089 4,089 3,740  
Actual return on plan assets         559 568  
Employer contributions         589 285 $ 0
Benefits paid from plan assets         (339) (346)  
Expenses paid         (142) (158)  
Ending fair value of plan assets         4,756 4,089 $ 3,740
Ending funded status         (1,795) (1,904)  
Amounts Recorded in the Consolidated Balance Sheets              
Current liabilities         0 0  
Non-current liabilities         (1,795) (1,904)  
Net amount recorded         (1,795) (1,904)  
Amounts Recorded in Accumulated Other Comprehensive Loss              
Net actuarial loss         $ (293) $ (123)