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Related party transactions (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended
	May 31, 2024	May 31, 2023	Sep. 30, 2025	Aug. 25, 2024	Jun. 30, 2025	May 25, 2025	May 28, 2023
Related Party Transaction [Line Items]
Contract liabilities			$ 7,214		$ 5,195
Contract liability, noncurrent			1,168		$ 2,560
Debt principal			191,468			$ 188,350
Operating cash flows from operating leases			102	$ 101
Non-cash interest expense, inclusive of related party			6,112	4,719
Term loan credit facility with related party | Line of credit
Related Party Transaction [Line Items]
Debt principal			$ 179,562			173,508
Stated interest rate			10.00%
Related party
Related Party Transaction [Line Items]
Contract liabilities			$ 4,131			2,731
Interest expense			5,833	4,400
Non-cash interest expense, inclusive of related party			5,740	4,296
Alcon
Related Party Transaction [Line Items]
Advances to affiliate						$ 307
Alcon | Related party
Related Party Transaction [Line Items]
Credit memo			5,500
Contract liabilities			4,131
Contract liability, noncurrent			1,058
Proceeds from term borrowings			142,270
Proceeds from sale of equipment		$ 7,730
Operating lease, term of contract							10 years
Operating cash flows from operating leases			$ 286	$ 301
Alcon | Contract liability prepayment
Related Party Transaction [Line Items]
Related party transaction, amount	$ 5,500
Alcon | Revenues | Customer concentration risk
Related Party Transaction [Line Items]
Concentration risk percentage			38.00%	32.00%

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