Stock Option Plan - Stock Appreciation Rights (Activity) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	May 30, 2020 USD ($) $ / shares shares
Additional disclosures
Award vesting period	3 years
Award expiration period	10 years
Stock Appreciation Rights (SARs)
Shares
Outstanding at beginning of period (in shares) | shares	0
Granted (in shares) | shares	150,000
Exercised (in shares) | shares	0
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	150,000
Options vested or expected to vest (in shares) | shares	150,000
Exercisable (in shares) | shares	0
Weighted average exercise price
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	24.20
Exercised (in dollars per share) | $ / shares	0
Forfeited (in dollars per share) | $ / shares	0
Outstanding at end of period (in dollars per share) | $ / shares	24.20
Options vested or expected to vest (in dollars per share) | $ / shares	24.20
Exercisable (in dollars per share) | $ / shares	$ 0
Weighted average remaining contractual term
Vested and expected to vest at end of period, weighted average remaining contractual life	9 years 5 months 1 day
Outstanding at end of period, weighted average remaining contractual life	9 years 5 months 1 day
Exercisable at end of period, weighted average remaining contractual life	0 years
Additional disclosures
Unrecognized compensation costs | $	$ 0.3
Period for recognition of unrecognized compensation cost	2 years 5 months 1 day