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Equity-Based Compensation Plans - Schedule of Stock Options Valuation using Black-Scholes Option Pricing Model (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 26, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average expected term	6 years
Expected volatility	40.30%
Expected dividend	0.00%
Risk-free interest rate	0.94%
Profit Interest Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average expected term		3 years 4 months 24 days	4 years 1 month 6 days	4 years 9 months 18 days
Expected volatility		72.50%	72.50%	62.50%
Expected Dividend		$ 0	$ 0	$ 0
Risk-free interest rate		0.30%	1.50%	2.50%

X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

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-Publisher FASB
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-Section 50
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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-Publisher FASB
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Disclosure of the weighted average expected dividend for an entity using a valuation technique with different dividend rates during the contractual term.

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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.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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