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Organization, Basis of Presentation, and Summary of Significant Accounting Policies - Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2020
Feb. 23, 2020
Nov. 24, 2019
Aug. 25, 2019
May 26, 2019
Feb. 24, 2019
Nov. 25, 2018
Aug. 26, 2018
May 31, 2020
May 26, 2019
May 27, 2018
May 28, 2017
Numerator:                        
Net (loss) income applicable to common stockholders $ (15,149) $ (11,518) $ (6,740) $ (4,784) $ (262) $ 1,067 $ (584) $ 190 $ (38,191) $ 411 $ 24,829  
Denominator:                        
Weighted average shares for basic net income per share (in shares)                 29,162 28,359 27,535  
Effect of dilutive securities:                        
Stock options and restricted stock units (in shares)                 0 248 380  
Weighted average shares for diluted net income (loss) per share (in shares)                 29,162 28,607 27,915  
Diluted net income per share (in dollars per share)                 $ (1.31) $ 0.01 $ 0.89  
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Weighted average exercise price of common stock (in dollars per share) $ 12.15       $ 12.94       $ 12.15 $ 12.94 $ 13.20 $ 13.20
Employee Stock Option                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Antdilutive securities outstanding (in shares)                 1,700 1,600 1,500  
Weighted average exercise price of common stock (in dollars per share) $ 12.71       $ 13.74       $ 12.71 $ 13.74 $ 13.80  
Restricted Stock Units (RSUs)                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                        
Antdilutive securities outstanding (in shares)                 200