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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
 12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
Earnings Per Share Disclosure [Line Items]      
Weighted average basic common shares outstanding [1] 32,569 32,648 32,670
Dilutive effect of restricted stock units [2] 1,062 1,017 771
Weighted average diluted common shares outstanding 33,631 33,665 33,441
[1] Restricted stock grants and restricted stock units that are considered participating securities, including some grants subject to certain performance criteria, are included in weighted average basic common shares outstanding when the Company is in a net earnings position.
[2] Restricted stock units that are not considered participating securities 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.