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Income taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	May 25, 2025	May 26, 2024
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ (8,122)	$ 1,998
State income taxes, net of federal benefit	(197)	52
Compensation-related activity	799	418
Return to provision adjustments	213	3,136
Deferred tax write-offs	(748)	711
Tax credit carryforwards	(539)	(518)
Other	96	158
Change in valuation allowance	8,541	(5,772)
Income tax provision	$ 43	$ 183

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