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Earnings Per Share - Schedule of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 26, 2021	Jun. 27, 2021	Mar. 28, 2021	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Sep. 26, 2021	Sep. 27, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ (30,200)	$ 23,098	$ (2,056)	$ 13,543	$ 12,509	$ 4,852	$ (9,158)	$ 30,904	$ 32,857	$ 561	$ (30,613)
Denominator:
Weighted average common shares	106,285,072			67,673,884			80,735,661	67,673,884	67,673,884	67,673,884	67,673,884
Dilutive effect of potential common shares	$ 0			$ 0			$ 0	$ 0	$ 0	$ 0	$ 0
Weighted average common shares assuming dilution	106,285,072			67,673,884			80,735,661	67,673,884	67,673,884	67,673,884	67,673,884
Earnings per share:
Basic	$ (0.28)			$ 0.20			$ (0.11)	$ 0.46	$ 0.49	$ 0.01	$ (0.45)
Diluted	$ (0.28)			$ 0.20			$ (0.11)	$ 0.46	$ 0.49	$ 0.01	$ (0.45)

X

- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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- Definition

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e1448-109256

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