Summary of significant accounting policies - Estimated Useful Lives of Assets (Details) |
Dec. 28, 2025 |
|---|---|
| Minimum | Land and leasehold improvements | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives of the assets | 10 years |
| Minimum | Machinery and equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives of the assets | 2 years |
| Maximum | Building and building equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives of the assets | 30 years |
| Maximum | Land and leasehold improvements | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives of the assets | 20 years |
| Maximum | Machinery and equipment | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives of the assets | 13 years |