Stock Option Plan - Stock Appreciation Rights (Activity) (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Feb. 29, 2020
Additional disclosures
Award vesting period	3 years
Award expiration period	10 years
Stock Appreciation Rights (SARs)
Shares
Outstanding at beginning of period (in shares)	0
Granted (in shares)	150,000
Exercised (in shares)	0
Forfeited (in shares)	0
Outstanding at end of period (in shares)	150,000
Options vested or expected to vest (in shares)	150,000
Exercisable (in shares)	0
Weighted average exercise price
Outstanding at beginning of period (in dollars per share)	$ 0
Granted (in dollars per share)	24.20
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Outstanding at end of period (in dollars per share)	24.20
Options vested or expected to vest (in dollars per share)	24.20
Exercisable (in dollars per share)	$ 0
Weighted average remaining contractual term
Vested and expected to vest at end of period, weighted average remaining contractual life	9 years 8 months 1 day
Outstanding at end of period, weighted average remaining contractual life	9 years 8 months 1 day
Exercisable at end of period, weighted average remaining contractual life	0 years
Additional disclosures
Unrecognized compensation costs	$ 0.4
Period for recognition of unrecognized compensation cost	2 years 8 months 1 day