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Related party transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended			9 Months Ended
	May 31, 2023	Feb. 23, 2025	May 26, 2024	Feb. 25, 2024	Feb. 23, 2025	Feb. 25, 2024	May 28, 2023
Related Party Transaction [Line Items]
Contract liability, noncurrent		$ 4,419	$ 4,960		$ 4,419
Current liabilities, current		2,565	2,113		2,565
Debt principal		184,361	187,539		184,361
Proceeds from sale of equipment					7,000	$ 0
Operating lease payment					334	644
Line of credit \| Term loan credit facility with related party
Related Party Transaction [Line Items]
Debt principal		$ 169,287	157,313		$ 169,287
Stated interest rate		10.00%			10.00%
Revenues \| Alcon \| Customer concentration risk
Related Party Transaction [Line Items]
Concentration risk percentage					43.00%
Alcon
Related Party Transaction [Line Items]
Advances to affiliate		$ 465	1,207		$ 465
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		1,750	$ 1,025		1,750
Related party \| Alcon
Related Party Transaction [Line Items]
Contract liability, noncurrent		4,053			4,053
Current liabilities, current		918			918
Credit memo		5,500			5,500
Proceeds from term borrowings					142,270
Proceeds from sale of equipment	$ 7,730
Operating lease, term of contract							10 years
Operating lease payment		$ 295		$ 306	$ 893	$ 667