Omnibus Incentive Plan (Tables)
 9 Months Ended
May 29, 2021
Share-based Payment Arrangement [Abstract]  
Stock option activity The following table summarizes stock option activity for the thirty-nine weeks ended May 29, 2021:
Shares underlying optionsWeighted average
exercise price		Weighted average remaining contractual life (years)
Outstanding as of August 29, 20202,615,899 $14.33 
Granted289,555 20.47 
Exercised(58,308)12.00 
Forfeited(53,983)22.33 
Outstanding as of May 29, 20212,793,163 $14.86 6.85
Vested and expected to vest as of May 29, 20212,793,163 $14.86 6.85
Exercisable as of May 29, 20212,215,040 $13.25 6.37
Restricted stock activity The following table summarizes restricted stock unit activity for the thirty-nine weeks ended May 29, 2021:
Restricted Stock UnitsWeighted average
grant-date fair value
Non-vested as of August 29, 2020208,023 $22.82 
Granted423,387 24.84 
Vested(79,381)25.08 
Forfeited(48,735)21.33 
Non-vested as of May 29, 2021503,294 $24.31 
Performance stock unit activity The following table summarizes performance stock unit activity for the thirty-nine weeks ended May 29, 2021:
Performance stock unitsWeighted average
grant-date fair value
Non-vested as of August 29, 2020295,256 $17.93 
Granted116,309 23.59 
Vested— — 
Forfeited(30,688)22.28 
Non-vested as of May 29, 2021380,877 $19.31 
Stock appreciation right activity The following table summarizes SARs activity for the thirty-nine weeks ended May 29, 2021:
Shares underlying SARsWeighted average
exercise price		Weighted average remaining contractual life (years)
Outstanding as of August 29, 2020150,000 $24.20 
Granted— — 
Exercised— — 
Forfeited— — 
Outstanding as of May 29, 2021150,000 $24.20 8.43
Vested and expected to vest as of May 29, 2021150,000 $24.20 8.43
Exercisable as of May 29, 2021— $— 0.00