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Business Combination and Acquisitions Business Combination - Summary of pro forma 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
Business Acquisition [Line Items]
Pro forma net sales	$ 159,673	$ 140,195	$ 521,836	$ 384,237
Pro forma net income (loss)	$ (30,200)	$ 15,045	$ (6,906)	$ 33,195
HPI And Range [Member]
Business Acquisition [Line Items]
Pro forma net sales						$ 373,459	$ 378,287
Pro forma net income (loss)						7,032	$ (30,225)
Range Drake Simpson And Detroit Speed [Member]
Business Acquisition [Line Items]
Pro forma net sales					$ 584,270	461,418
Pro forma net income (loss)					$ 37,304	$ (8,799)

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 2
-Subparagraph (h)(3)
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