Document and Entity Information |
3 Months Ended |
|---|---|
Mar. 28, 2015 | |
| Document And Entity Information [Abstract] | |
| Document Type | S-1 |
| Amendment Flag | false |
| Document Period End Date | Mar. 28, 2015 |
| Trading Symbol | SUM |
| Entity Registrant Name | SUMMIT MATERIALS, INC. |
| Entity Central Index Key | 0001621563 |
| Entity Filer Category | Non-accelerated Filer |