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Income Taxes - Additional Information (Detail) - USD ($)
 3 Months Ended
Sep. 03, 2017
Aug. 31, 2016
Income Tax Contingency [Line Items]    
Deferred tax assets $ 48,000,000  
Federal net operating loss and tax credit carryforwards 33,500,000  
State net operating loss carryforwards 7,400,000  
Differences between financial and tax reporting 7,100,000  
Income tax expense (benefit) 0 $ 0
Federal [Member]    
Income Tax Contingency [Line Items]    
Federal net operating loss and tax credit carryforwards 546,000  
Income tax expense (benefit) 0 0
State [Member]    
Income Tax Contingency [Line Items]    
State net operating loss carryforwards 113,000  
Income tax expense (benefit) $ 0 $ 0
Minimum [Member] | Federal [Member]    
Income Tax Contingency [Line Items]    
Net operating loss and tax credit carryforwards life expectancy 11 years  
Minimum [Member] | State [Member]    
Income Tax Contingency [Line Items]    
Net operating loss and tax credit carryforwards life expectancy 1 year  
Maximum [Member] | Federal [Member]    
Income Tax Contingency [Line Items]    
Net operating loss and tax credit carryforwards life expectancy 18 years  
Maximum [Member] | State [Member]    
Income Tax Contingency [Line Items]    
Net operating loss and tax credit carryforwards life expectancy 20 years