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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
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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.

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=123586518&loc=d3e1043-128460 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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