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Stock-based Compensation and Stockholders’ Equity - Stock Options Outstanding and Exercisable (Details) - USD ($)
 12 Months Ended
May 30, 2021
May 31, 2020
May 26, 2019
Options Outstanding      
Options outstanding, beginning balance (in shares) 1,716,358 2,000,096 1,955,335
Options granted (in shares) 682,600 435,000 368,264
Options exercised (in shares) 0 (163,333) (116,834)
Options forfeited and canceled (in shares) (127,714) (55,806) (71,669)
Options expired (in shares) (437,227) (499,599) (135,000)
Options outstanding, ending balance (in shares) 1,834,017 1,716,358 2,000,096
Options exercisable (in shares) 1,011,265    
Weighted-Average Exercise Price Per Share      
Options outstanding, beginning balance (in dollars per share) $ 12.15 $ 12.94 $ 13.20
Options granted (in dollars per share) 9.66 10.42 11.85
Options exercised (in dollars per share) 0 11.16 11.82
Options forfeited and canceled (in dollars per share) 9.93 13.08 13.75
Options expires (in dollars per share) 13.42 14.04 14.18
Options outstanding, ending balance (in dollars per share) 11.07 $ 12.15 $ 12.94
Options exercisable (in dollars per share) $ 12.02    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Total Intrinsic Value of Options Exercised $ 169,066 $ 265,911
Weighted average remaining contractual term, options outstanding 4 years 2 months 4 days    
Weighted average remaining contractual term, options exercisable 2 years 8 months 1 day    
Aggregate intrinsic value, options outstanding $ 2,446,243    
Aggregate intrinsic value, options exercisable $ 747,977