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Equity-Based Compensation Plans - Summary of Share-based Compensation Arrangements by Share-based Payment Award (Detail) - Profit Interest Units [Member] - $ / shares | 9 Months Ended | 12 Months Ended
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Sep. 26, 2021 | Sep. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Outstanding PIUs, Granted | 8,445 | 5,932 |  |  |
Outstanding PIUs, Ending Balance | 36,045 | 4,507 |  |  |
Weighted Average Grant Date Fair Value, Ending Balance | $ 0.64 | $ 0.27 |  |  |
Incentive Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Outstanding PIUs, Beginning Balance | 35,570 | 31,831 | 31,831 | 27,925 |
Outstanding PIUs, Granted |  |  | 5,932 | 3,906 | 27,925
Outstanding PIUs, Forfeited |  |  | (2,193) |  |
Outstanding PIUs, Ending Balance |  |  | 35,570 | 31,831 | 27,925
Weighted Average Grant Date Fair Value, Beginning Balance | $ 0.27 | $ 0.27 | $ 0.27 | $ 0.27 |
Weighted Average Grant Date Fair Value, Granted |  |  | 0.28 | 0.25 | 0.27
Weighted Average Grant Date Fair Value, Forfeited |  |  | 0.27 |  |
Weighted Average Grant Date Fair Value, Ending Balance |  |  | $ 0.27 | $ 0.27 | $ 0.27

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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 The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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