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Omnibus Incentive Plan - Stock Options Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 28, 2020
Nov. 30, 2019
Additional disclosures    
Proceeds from option exercises $ 157 $ 208
Stock Options    
Shares    
Outstanding at beginning of period (in shares) 2,615,899  
Granted (in shares) 282,952  
Exercised (in shares) (13,118)  
Forfeited (in shares) (39,575)  
Outstanding at end of period (in shares) 2,846,158  
Options vested or expected to vest (in shares) 2,846,158  
Exercisable (in shares) 2,228,465  
Weighted average exercise price    
Outstanding at beginning of period (in dollars per share) $ 14.33  
Granted (in dollars per share) 20.28  
Exercised (in dollars per share) 12.00  
Forfeited (in dollars per share) 23.08  
Outstanding at end of period (in dollars per share) 14.81  
Options vested or expected to vest (in dollars per share) 14.81  
Exercisable (in dollars per share) $ 13.22  
Weighted average remaining contractual term    
Outstanding at end of period, weighted average remaining contractual life 7 years 4 months 2 days  
Vested and expected to vest at end of period, weighted average remaining contractual life 7 years 4 months 2 days  
Exercisable at end of period, weighted average remaining contractual life 6 years 10 months 6 days  
Additional disclosures    
Unrecognized compensation costs $ 4,000  
Period for recognition of unrecognized compensation cost 2 years 1 month 6 days