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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
Nov. 30, 2024
Nov. 30, 2023
Earnings Per Share Disclosure [Line Items]    
Weighted average basic common shares outstanding 31,246 31,025
Dilutive effect of restricted stock units [1] 934 931
Weighted average diluted common shares outstanding 32,223 32,782
2.875% Convertible senior notes, due 2024    
Earnings Per Share Disclosure [Line Items]    
Dilutive effect of convertible notes [2]   826
2.875% Convertible senior notes, due 2028    
Earnings Per Share Disclosure [Line Items]    
Dilutive effect of convertible notes [3] 43  
[1] 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.
[2] The dilutive effect of the 2.875% Convertible notes due 2024 was included for the three months ended November 30, 2023 under the “if converted” method as further discussed below. These notes were retired on February 1, 2024.
[3] The dilutive effect of the 2.875% Convertible notes due 2028 was excluded for the three months ended November 30, 2023 as the average stock price was less than the applicable conversion price and therefore was considered anti-dilutive. As these notes require cash settlement for the principal, only a premium is potentially dilutive under the "if converted" method as further discussed below.