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Acquisition, Restructuring and Management Fee Costs - Summary of Total Acquisition, Restructuring and Management Fee Costs (Details) - 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
Business Combination and Asset Acquisition [Abstract]              
Acquisitions [1] $ 204 $ 137 $ 3,415 $ 1,301      
Restructuring 140 [2] 955 [2] 1,265 [2] 4,323 [2] $ 5,309 $ 3,538 $ 1,220
Management fees [3] 23,274 894 25,813 2,665      
Earn out adjustment [4] 0 0 17,173 0      
Total acquisition, restructuring and management fees $ 23,618 $ 1,986 $ 47,666 $ 8,289 $ 15,832 $ 8,604 $ 22,022
[1] Includes professional fees for legal, accounting, consulting, administrative, and other professional services directly attributable to potential acquisitions.
[2] Includes costs incurred as part of the restructuring of operations including professional and consulting services.
[3] Includes acquisition costs and management fees paid to Sentinel Capital Partners, including a fee of $23,275 paid in the 13-week period ended September 26, 2021 upon the closing of the Business Combination.
[4] A fair value adjustment to the contingent consideration payable from the Simpson acquisition.