Stocks Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
Aug. 31, 2025	Aug. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Class A Common Stock were authorized for issuance	7,825,000
Shares available for future grants	2,577,263
Exercise price as percentage of fair market value at grant date	100.00%
Unrecognized compensation cost related to share-based compensation for stock options and restricted stock outstanding	$ 9.9
Unrecognized compensation cost related to share-based compensation for stock options and restricted stock outstanding, recognition period	1 year 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	126,171	225,849
Expected forfeiture rate	12.00%
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period	3 years
Performance Shares \| Total Shareholders Return
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.34%
Performance Shares \| Adjusted Earnings Per Share
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Performance Shares \| Return on Capital Investment
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	33.33%
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	$ 11.8	$ 8.3
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	200.00%
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options term	10 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	0.00%

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Number of shares authorized for issuance under share-based payment arrangement.

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