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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 26, 2019	May 27, 2018
Income Tax Disclosure [Abstract]
Tax at U.S. statutory rate	$ (10,774)	$ 764	$ 4,784
State income taxes, net of federal benefit	(1,782)	46	439
Tax reform/CARES Act	(2,770)	0	(14,350)
Change in valuation allowance	2,654	929	(176)
Tax credit carryforwards	(613)	(771)	(777)
Other compensation-related activity	334	618	566
Impairment of goodwill	647	0	0
Foreign rate differential	(863)	0	0
Other	51	(68)	151
Income tax expense (benefit)	$ (13,116)	$ 1,518	$ (9,363)
Statutory rate	21.00%	21.00%	29.40%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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