Incomes Taxes - Deferred Tax Asset Valuation Allowance (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2022 |
Jan. 01, 2022 |
|
| Valuation Allowance: | ||
| Beginning balance | $ (1,675) | $ (1,675) |
| Release of valuation allowance and other | 562 | 0 |
| Ending balance | (1,113) | (1,675) |
| Summit Materials, LLC | ||
| Valuation Allowance: | ||
| Beginning balance | (1,675) | (1,675) |
| Release of valuation allowance and other | 562 | 0 |
| Ending balance | $ (1,113) | $ (1,675) |