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Balance sheet information - Components of Accounts Receivable (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 28, 2024	Sep. 28, 2024	Dec. 31, 2023
Concentration Risk [Line Items]
Accounts receivable	$ 124,740	$ 124,740	$ 127,008
Loss on disposals	1,064	1,064
Discontinued Operations, Held-for-sale
Concentration Risk [Line Items]
Accounts receivable	$ 6,437	$ 6,437
Accounts Receivable | Customer | Customer One
Concentration Risk [Line Items]
Concentration risk percentage		23.20%	16.00%

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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