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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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