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Accounts and note receivable - Narrative (Details) - USD ($) $ in Thousands				9 Months Ended	12 Months Ended
	Jul. 07, 2026	Jan. 07, 2026	Jul. 07, 2025	Feb. 23, 2025	May 26, 2024	Jan. 07, 2025
Concentration Risk [Line Items]
Note receivable				$ 10,000		$ 10,000
Note receivable, variable interest rate						1.00%
Note receivable, effective interest rate				8.50%
Note receivable, discount				$ 305		$ 410
Current portion of note receivable				8,000	$ 0
Noncurrent portion of note receivable				1,695
Interest income				$ 105
Forecast
Concentration Risk [Line Items]
Proceeds from collection of notes receivable	$ 2,000	$ 4,000	$ 4,000
Customer A | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage				47.00%	34.00%
Customer B | Accounts receivable | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage				19.00%	18.00%

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Amount of unamortized purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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