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Merger Agreement - Changes in Number of Shares Outstanding (Details) - shares | Jul. 14, 2021 | Sep. 25, 2021 | Dec. 26, 2020 | Sep. 26, 2020 | Jun. 27, 2020 | Mar. 28, 2020 | Dec. 28, 2019
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Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |
Common shares issued to New Hillman Shareholders | 91,220,901 |  |  |  |  |  |
Common Shares outstanding immediately after the Business Combination | 187,392,901 | 187,481,206 | 90,934,930 | 89,726,225 | 89,637,920 | 89,637,920 | 89,549,615
SPAC sponsors and public shareholders |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |
Shares issued | 58,672,000 |  |  |  |  |  |
PIPE investors |  |  |  |  |  |  |
Schedule Of Reverse Recapitalization [Line Items] |  |  |  |  |  |  |
Shares issued | 37,500,000 |  |  |  |  |  |

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