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Acquisition, Restructuring and Management Fee Costs - Additional Information (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
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition restructuring and management fee costs | $ 23,618 |  | $ 1,986 |  | $ 47,666 |  | $ 8,289 |  | $ 15,832 | $ 8,604 | $ 22,022
Professional fees directly attributable to acquistion |  |  |  |  |  |  |  |  | 4,434 | 1,404 | 7,933
Restructuring costs | $ 140 | [1] | $ 955 | [1] | 1,265 | [1] | $ 4,323 | [1] | 5,309 | 3,538 | 1,220
Sentinel Capital Partners[Member] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aacquisition costs and management fees |  |  |  |  | $ 23,275 |  |  |  | $ 6,089 | $ 3,662 | $ 12,869
[1] | Includes costs incurred as part of the restructuring of operations including professional and consulting services.

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- Definition Professional fees directly attributable to acquistion. + References No definition available. + Details
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- Definition Acquisition, restructuring and management fees. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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