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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	May 25, 2025	May 26, 2024
Deferred tax assets:
Net operating loss carryforwards	$ 40,677	$ 40,806
Limitations on business interest expense	15,573	11,783
Research credit carryforwards	7,116	6,700
Capitalized research and development	3,767	2,916
Other	6,338	4,609
Deferred tax assets before valuation allowance	73,471	66,814
Less: valuation allowance	(54,714)	(46,173)
Deferred tax assets	18,757	20,641
Deferred tax liabilities:
Depreciation	(10,735)	(11,809)
Debt derivative liability and related debt discount	(7,026)	(7,911)
Other	(1,419)	(1,464)
Deferred tax liabilities	(19,180)	(21,184)
Net deferred tax liability	$ (423)	$ (543)

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