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Stock-Based Compensation (Expenses) (Details) - USD ($)
3 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Jul. 31, 2023
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 2,645,000 $ 904,000  
CEO transition costs related to equity-classified stock-based awards 0 3,764,000  
Total stock-based compensation expense before income tax benefit 2,645,000 4,668,000  
Estimated Income tax benefit (584,000) (493,000)  
Net stock-based compensation expense 2,061,000 4,175,000  
Total remaining unrecognized compensation cost related to the unvested stock-based awards 13,988,000    
Estimated forfeitures related to unvested stock-based awards $ 803,000    
Weighted average number of years net compensation cost is expected to be recognized over 2 years 3 months 18 days    
Stock-based compensation capitalized and included in ending inventory $ 198,000   $ 198,000
Stock options      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 19,000 25,000  
Number of stock-based awards outstanding at period end (in shares) 234,260   240,510
Performance shares      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 357,000 74,000  
RSUs and restricted stock      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs 2,244,000 774,000  
ESPP      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 25,000 31,000  
Discount offered to employees participating in the ESPP as a percentage of market price 15.00%    
2000 Stock Incentive Plan | Stock options      
Stock-based Compensation Expenses      
Number of stock-based awards outstanding at period end (in shares) 234,260    
2000 Stock Incentive Plan | Stock appreciation rights (SARs)      
Stock-based Compensation Expenses      
Number of stock-based awards outstanding at period end (in shares) 0   0
Cost of sales      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 282,000 158,000  
Selling, general and administrative expenses      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs 2,176,000 648,000  
Research and development expenses      
Stock-based Compensation Expenses      
Stock-based compensation expense before CEO transition costs $ 187,000 $ 98,000