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Stock-based Compensation and Stockholders’ Equity - Stock Options Outstanding and Exercisable (Details) - USD ($)
 12 Months Ended
May 31, 2020
May 26, 2019
May 27, 2018
Options Outstanding      
Options outstanding, beginning balance (in shares) 2,000,096 1,955,335 1,571,542
Options granted (in shares) 435,000 368,264 498,000
Options exercised (in shares) (163,333) (116,834) (29,333)
Options forfeited and canceled (in shares) (55,806) (71,669) (23,334)
Options expired (in shares) (499,599) (135,000) (61,540)
Options outstanding, ending balance (in shares) 1,716,358 2,000,096 1,955,335
Options exercisable (in shares) 1,113,441    
Weighted-Average Exercise Price Per Share      
Options outstanding, beginning balance (in dollars per share) $ 12.94 $ 13.20 $ 13.20
Options granted (in dollars per share) 10.42 11.85 12.93
Options exercised (in dollars per share) 11.16 11.82 7.36
Options forfeited and canceled (in dollars per share) 13.08 13.75 12.55
Options expires (in dollars per share) 14.04 14.18 14.23
Options outstanding, ending balance (in dollars per share) 12.15 $ 12.94 $ 13.20
Options exercisable (in dollars per share) $ 13.05    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Total Intrinsic Value of Options Exercised $ 169,066 $ 265,911 $ 177,921
Weighted average remaining contractual term, options outstanding 3 years 9 months    
Weighted average remaining contractual term, options exercisable 2 years 3 months 18 days    
Aggregate intrinsic value, options outstanding $ 416,090    
Aggregate intrinsic value, options exercisable $ 70,567