Earnings Per Share - Reconciliation of Shares Used in Computation of Basic and Diluted Earnings Per Common Share (Detail) - shares shares in Thousands		3 Months Ended		6 Months Ended
		Feb. 29, 2024	Feb. 28, 2023	Feb. 29, 2024	Feb. 28, 2023
Earnings Per Share Disclosure [Line Items]
Weighted average basic common shares outstanding		31,117	32,588	31,071	32,654
Dilutive effect of convertible notes	[1]	563	821	694
Dilutive effect of restricted stock units	[2]	890	991	911	1,000
Weighted average diluted common shares outstanding		32,570	34,400	32,676	33,654

[1] The dilutive effect of the 2.875% Convertible notes due 2024 was excluded for the six months ended February 28, 2023 as they were considered anti-dilutive under the “if converted” method as further discussed below. These notes were retired on February 1, 2024.

[2] Restricted stock units and restricted stock units subject to performance criteria, for which actual levels of performance above target have been achieved, are included in weighted average diluted common shares outstanding when the Company is in a net earnings position