Share-based Payments - Estimate Fair Value of Stock Options (Details) - Stock options - Stock Incentive Plan - Market Options	12 Months Ended
	Aug. 31, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.50%
Expected volatility	36.50%
Risk-free interest rate	0.70%
Expected life of options	8 years
Weighted-average fair value of options (in dollars per share)	$ 40.45