Intangible assets - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 28, 2024 USD ($)	Dec. 30, 2023 USD ($)	Nov. 08, 2024	May 14, 2024	Dec. 28, 2022 patent
Finite Lived Intangible Assets [Line Items]
Intangible amortization expense | $	$ 3.4	$ 1.5
Trade names | ALT5 Subsidiary
Finite Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)				7 years
Customer relationships | ALT5 Subsidiary
Finite Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)				10 years
Developed technology | ALT5 Subsidiary
Finite Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)				5 years
Soin intangibles
Finite Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)					10 years
Number of pending patents | patent					3
Qoden Technologies, LLC | Qoden intangible
Finite Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)			2 years