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Income taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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