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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
May 28, 2017
Tax Credit Carryforward [Line Items]        
Statutory rate 21.00% 21.00% 29.40%  
Effective tax rate for the fiscal year 26.00% 71.00% 64.00%  
Tax reform/CARES Act benefit $ 2,770 $ 0 $ 14,350  
Excess tax deficits related to stock-based compensation 400 200    
Deferred tax asset valuation allowance 6,770 4,116    
Unrecognized tax benefits 827 $ 616 $ 479 $ 537
Unrecognized tax benefits that would change the effect tax rate if recognized 700      
Domestic Tax Authority        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 42,900      
Operating loss carryforwards, not subject to expiration 35,600      
Tax credit carryforward amount $ 2,200      
Tax credit carryforward, period 20 years      
Deferred tax asset valuation allowance $ 400      
Foreign Tax Authority        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 11,700      
Deferred tax asset valuation allowance 3,500      
State and Local Jurisdiction        
Tax Credit Carryforward [Line Items]        
Deferred tax asset valuation allowance 2,800      
California        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 18,500      
Tax credit carryforward amount 2,100      
Indiana        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 6,500      
Other States, Tax Board        
Tax Credit Carryforward [Line Items]        
Net operating loss carryforwards 14,100      
Minnesota        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward amount $ 400      
Tax credit carryforward, period 15 years