Annual report pursuant to Section 13 and 15(d)

Summary of Weighted-Average Grant-Date Fair Value of Options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised (Detail)

v3.21.2
Summary of Weighted-Average Grant-Date Fair Value of Options, Total Intrinsic Value of Options Exercised, and Cash Receipts from Options Exercised (Detail) - USD ($)
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Share-based Payment Arrangement [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 587,000 $ 803,000 $ 429,000
Stock option exercises & other $ 2,208,000 $ 2,631,000 $ 1,404,000
Expected forfeiture rate 12.00% 8.00% 10.00%
Stock option, aggregate intrinsic Value $ 1,013,960