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Related party transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	May 31, 2023	May 26, 2024	May 25, 2025	May 26, 2024	May 28, 2023
Related Party Transaction [Line Items]
Current liabilities, current		$ 2,113	$ 3,415	$ 2,113
Contract liability, noncurrent		4,960	3,025	4,960
Debt principal		187,539	188,350	187,539
Proceeds from sale of equipment			7,000	0
Operating lease payment			445	761
Non-cash interest expense			20,247	15,442
Line of credit | Term loan credit facility with related party
Related Party Transaction [Line Items]
Debt principal		157,313	$ 173,508	$ 157,313
Stated interest rate			10.00%
Revenues | Alcon | Customer concentration risk
Related Party Transaction [Line Items]
Concentration risk percentage			44.00%	39.00%
Alcon
Related Party Transaction [Line Items]
Advances to affiliate		1,207	$ 307	$ 1,207
Alcon | Contract liability prepayment
Related Party Transaction [Line Items]
Related party transaction, amount		5,500
Related party
Related Party Transaction [Line Items]
Current liabilities, current		$ 1,025	2,731	1,025
Interest expense, net			18,879	14,662
Non-cash interest expense			18,473	14,186
Contract asset			110
Related party | Alcon
Related Party Transaction [Line Items]
Credit memo			5,500
Current liabilities, current			2,731
Contract liability, noncurrent			2,768
Proceeds from term borrowings			142,270
Proceeds from sale of equipment	$ 7,730
Operating lease, term of contract					10 years
Operating lease payment			$ 1,185	$ 970

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