Interim Financial Statements - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Jan. 05, 2023	Feb. 28, 2023	Feb. 28, 2023	Feb. 28, 2022
Equity Class Of Treasury Stock [Line Items]
Stock repurchased authorized amount		$ 100.0	$ 100.0
Stock repurchase program remaining authorized repurchase amount		$ 85.9	$ 85.9
Stock repurchase program number of shares repurchased				0
Share repurchase program, current authorization of shares purchased		575,000	478,000
Share repurchase program, current authorization of shares purchased amount		$ 17.4	$ 14.1
Share repurchase program expiration date			Jan. 31, 2023
Stock repurchase program extension date	Jan. 31, 2025
ASU 2020-04
Equity Class Of Treasury Stock [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Dec. 31, 2022	Dec. 31, 2022