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, 2026	Aug. 31, 2025	Aug. 31, 2024
Share-Based Payment Arrangement [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 900,000	$ 1,700,000	$ 2,900,000
Stock option exercises & other		1,700,000	6,900,000
Expected forfeiture rate	12.00%
Stock Issued During Period, Value, Stock Options Exercised	$ 2,200,000	$ 1,700,000	$ 6,900,000
Stock option, aggregate intrinsic Value	$ 426,207
Granted	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	85,071
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0
Expired	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	41,100	126,171
Options exercisable at end of Period	41,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 26.95	$ 26.42
Options exercisable at end of Period	26.95
Granted	0
Exercised	26.17
Forfeited	0
Expired	$ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding	$ 426,207
Option Outstanding weighted average remaining term	6 months
Option exercisable weighted average remaining term	6 months