Accrued Mining and Landfill Reclamation - Narrative (Detail) - USD ($) $ in Millions |
Dec. 31, 2022 |
Jan. 01, 2022 |
|---|---|---|
| Asset Retirement Obligations [Line Items] | ||
| Anticipated costs | $ 124.9 | $ 112.4 |
| Accrued Liabilities, Current | ||
| Asset Retirement Obligations [Line Items] | ||
| Asset retirement obligation, current | 4.0 | 7.4 |
| Summit Materials, LLC | ||
| Asset Retirement Obligations [Line Items] | ||
| Anticipated costs | 124.9 | 112.4 |
| Summit Materials, LLC | Accrued Liabilities, Current | ||
| Asset Retirement Obligations [Line Items] | ||
| Asset retirement obligation, current | $ 7.0 | $ 7.4 |