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Stock-based Compensation and Stockholders’ Equity - Stock Options Outstanding and Exercisable (Details) - USD ($)
 12 Months Ended
May 26, 2019
May 27, 2018
May 28, 2017
Options Outstanding      
Options granted (in shares) 368,264 498,000 240,000
Weighted-Average Exercise Price Per Share      
Options outstanding, beginning balance (in dollars per share) $ 13.80 $ 13.58  
Options outstanding, ending balance (in dollars per share) 13.74 13.80 $ 13.58
Options exercisable (in dollars per share) $ 11.85 $ 12.93 $ 11.58
Employee Stock Option      
Options Outstanding      
Options outstanding, beginning balance (in shares) 1,955,335 1,571,542 1,731,474
Options granted (in shares) 368,264 498,000 240,000
Options exercised (in shares) (116,834) (29,333) (357,639)
Options forfeited (in shares) (71,669) (23,334) (42,293)
Options expired (in shares) (135,000) (61,540) 0
Options outstanding, ending balance (in shares) 2,000,096 1,955,335 1,571,542
Options exercisable (in shares) 1,524,473    
Weighted-Average Exercise Price Per Share      
Options outstanding, beginning balance (in dollars per share) $ 13.20 $ 13.20 $ 11.90
Options granted (in dollars per share) 11.85 12.93 11.58
Options exercised (in dollars per share) 11.82 7.36 5.93
Options forfeited (in dollars per share) 13.75 12.55 12.16
Options expires (in dollars per share) 14.18 14.23 0.00
Options outstanding, ending balance (in dollars per share) 12.94 $ 13.20 $ 13.20
Options exercisable (in dollars per share) $ 13.30    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]      
Total Intrinsic Value of Options Exercised $ 265,911 $ 177,921 $ 2,780,597
Weighted average remaining contractual term, options outstanding 3 years 3 months 15 days    
Weighted average remaining contractual term, options exercisable 2 years 4 months 28 days    
Aggregate intrinsic value, options outstanding $ 16,807    
Aggregate intrinsic value, options exercisable $ 5,467