Stock Option Plan (Tables)

9 Months Ended

May 30, 2020

Share-based Payment Arrangement [Abstract]

Stock option activity

The following table summarizes stock option activity for the thirty-nine weeks ended May 30, 2020:

	Shares Underlying Options		Weighted average exercise price		Weighted average remaining contractual life (in years)
Outstanding as of August 31, 2019	2,748,735		$	13.35
Granted	194,014		24.20
Exercised	(76,366	)	12.20
Forfeited	—		—
Outstanding as of May 30, 2020	2,866,383		$	14.12	7.52
Vested and expected to vest as of May 30, 2020	2,866,383		$	14.12	7.52
Exercisable as of May 30, 2020	1,551,838		$	12.70	7.27

Restricted stock activity

The following table summarizes restricted stock unit activity for the thirty-nine weeks ended May 30, 2020:

	Restricted Stock Units		Weighted average grant-date fair value
Non-vested as of August 31, 2019	92,400		$	17.50
Granted	158,512		24.01
Vested	(51,518	)	18.17
Forfeited	(4,923	)	16.36
Non-vested as of May 30, 2020	194,471		$	22.66

Performance stock unit activity

The following table summarizes performance stock unit activity for the thirty-nine weeks ended May 30, 2020:

	Performance Stock Units		Weighted average grant-date fair value
Non-vested as of August 31, 2019	192,389		$	11.93
Granted	121,288		27.39
Vested	—		—
Forfeited	(3,142	)	16.67
Non-vested as of May 30, 2020	310,535		$	17.92

Stock appreciation right activity

The following table summarizes SARs activity for the thirty-nine weeks ended May 30, 2020:

	Shares Underlying SARs	Weighted average exercise price		Weighted average remaining contractual life (in years)
Outstanding as of August 31, 2019	—	$	—
Granted	150,000	24.20
Exercised	—	—
Forfeited	—	—
Outstanding as of May 30, 2020	150,000	$	24.20	9.42
Vested and expected to vest as of May 30, 2020	150,000	$	24.20	9.42
Exercisable as of May 30, 2020	—	$	—	0.00