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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 22, 2017
May 26, 2019
May 27, 2018
May 28, 2017
May 29, 2016
Tax Credit Carryforward [Line Items]          
Statutory rate 35.00% 21.00% 29.40% 35.00%  
Effective tax rate for the fiscal year   71.00% (64.00%) 29.00%  
Excess tax deficits related to stock-based compensation   $ 153 $ 38    
Unrecognized tax benefits   616 479 $ 537 $ 842
Unrecognized tax benefits that would change the effect tax rate if recognized   500      
Decrease in unrecognized tax benefits   32      
Deferred tax asset valuation allowance   4,116 $ 1,337    
Domestic Tax Authority          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards   26,500      
Tax credit carryforward amount   900      
Foreign Tax Authority          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards   9,900      
California | State and Local Jurisdiction          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards   3,400      
Tax credit carryforward amount   $ 1,800      
Tax credit carryforward, period   20 years      
Indiana | State and Local Jurisdiction          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards   $ 5,800      
Other States, Tax Board | State and Local Jurisdiction          
Tax Credit Carryforward [Line Items]          
Net operating loss carryforwards   6,300      
Minnesota | State and Local Jurisdiction          
Tax Credit Carryforward [Line Items]          
Tax credit carryforward amount   $ 1,000      
Tax credit carryforward, period   15 years