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Income taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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May 25, 2025 | May 26, 2024
Tax Credit Carryforward [Line Items] |  |
Unrecognized tax benefits | $ 1,323 |
Unrecognized tax benefits that would change the effect tax rate if recognized | 1,186 |
Federal |  |
Tax Credit Carryforward [Line Items] |  |
Operating loss carryforwards, not subject to expiration | 164,770 |
Carryforwards utilized | 2,051 | $ 3,907
State |  |
Tax Credit Carryforward [Line Items] |  |
Carryforwards utilized | $ 0 | $ 0

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