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Equity-based compensation - Narrative (Details) - USD ($) | 3 Months Ended
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Mar. 30, 2024 | Apr. 01, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity compensation | $ 2,591,000 |
Unamortized compensation expense, options | 5,211,000 |
RSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unamortized compensation expense, RSUs | $ 8,159,000 |
Compensation expense net yet amortized, period for recognition | 1 year 8 months 15 days |
RSUs | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 1 year |
RSUs | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Compensation expense net yet amortized, period for recognition | 2 years 1 month 24 days |
Expiration period | 10 years |
Weighted-average fair value of stock options granted (in dollars per share) | $ 2.26 |
Stock options | Minimum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 1 year |
Stock options | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Vesting period | 4 years |
Employee Stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares available to be awarded (in shares) | 1,519,604 |
Equity compensation |  | $ 128,000
Number of shares issued (in shares) | 0 | 222,076
2021 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Income tax benefit | $ 0 | $ 430,000
2021 and 2023 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Equity compensation |  | $ 1,718,000
Common Class A |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Common stock closing price, (in dollars per share) | $ 5.20 |
Common Class A | 2021 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized to be awarded (in shares) | 19,564,333 |
Number of shares available to be awarded (in shares) | 9,119,667 |
Common Class A | 2023 Retention Equity Award Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of shares authorized to be awarded (in shares) | 600,000 |
Number of shares available to be awarded (in shares) | 80,700 |

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