Intangible assets (Schedule of major components) (Details) - USD ($) $ in Thousands	Dec. 28, 2024	Dec. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Cost	$ 27,324	$ 27,324
Accumulated amortization	7,247	5,463
Net book value	20,077	21,861
Brand names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	25,073	25,073
Accumulated amortization	6,189	4,517
Net book value	18,884	20,556
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	2,251	2,251
Accumulated amortization	1,058	946
Net book value	$ 1,193	$ 1,305