XML 48 R38.htm IDEA: XBRL DOCUMENT v3.21.2
Equity Compensation Plans - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Aug. 31, 2022
Aug. 31, 2021
Aug. 31, 2020
May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average fair value per share of stock options granted       $ 7.71
Compensation expense related to share based awards   $ 1,690,000 $ 1,681,000  
Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share options granted 0      
2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       118,250
Weighted-average fair value per share of RSUs       $ 34.21
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       4 years
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount   $ 2,908,000    
2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs) | Subsequent Event [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0      
Employee Stock Purchase Plan | 2011 Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual maximum limit percentage of compensation to purchase shares   5.00%    
Employee stock purchase plan stock price percentage   10.00%    
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   3 years    
Stock option contractual terms   5 years    
Minimum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period       3 years
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period   5 years    
Stock option contractual terms   10 years    
Maximum | 2018 Omnibus Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option vesting period       5 years