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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
	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.

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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

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- Definition

Gross number of share options (or share units) granted during the period.

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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

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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