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Stock-Based Compensation (Expenses) (Details)
 1 Months Ended 12 Months Ended
Mar. 12, 2024
shares
Dec. 31, 2021
director
Jul. 31, 2024
USD ($)
shares
Jul. 31, 2023
USD ($)
shares
Jul. 31, 2022
USD ($)
shares
Jul. 31, 2021
shares
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     $ 6,096,000 $ 10,107,000 $ 7,767,000  
CEO transition costs related to equity-classified stock-based awards     0 3,764,000 7,388,000  
Total stock-based compensation expense before income tax benefit     6,096,000 13,871,000 15,155,000  
Estimated income tax benefit     (1,298,000) (2,552,000) (2,260,000)  
Net stock-based compensation expense     4,798,000 $ 11,319,000 $ 12,895,000  
Total remaining unrecognized compensation cost related to the unvested stock-based awards     6,183,000      
Estimated forfeitures related to unvested stock-based awards     $ 687,000      
Weighted average number of years net compensation cost is expected to be recognized over     1 year 10 months 24 days      
Stock-based compensation capitalized and included in ending inventory     $ 198,000      
Number of stock-based awards outstanding at period end (in shares) | shares     141,190 240,510 483,480 1,073,435
Stock-based compensation related to retirement of Board of Directors       $ 827,000    
Number of retired Board of Directors | director   3        
Stock options            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     $ 60,000 87,000 $ 519,000  
Performance shares            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     480,000 973,000 1,136,000  
RSUs, restricted stock, share units and other stock-based awards            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     5,477,000 8,926,000 5,912,000  
ESPP            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     $ 79,000 $ 121,000 200,000  
Discount offered to employees participating in the ESPP as a percentage of market price     15.00%      
RSU and Performance Shares            
Stock-based Compensation Expenses            
Share-based compensation arrangement by share-based payment award, equity instruments other than options, forfeited in period (in shares) | shares 581,021          
2000 Stock Incentive Plan | Stock appreciation rights (SARs)            
Stock-based Compensation Expenses            
Number of stock-based awards outstanding at period end (in shares) | shares     0 0    
2000 Stock Incentive Plan | Stock options            
Stock-based Compensation Expenses            
Number of stock-based awards outstanding at period end (in shares) | shares     141,190      
Cost of sales            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     $ 778,000 $ 1,110,000 692,000  
Selling, general and administrative expenses            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     4,777,000 7,960,000 6,312,000  
Research and development expenses            
Stock-based Compensation Expenses            
Stock-based compensation expense (benefit) before income tax benefit     $ 541,000 $ 1,037,000 $ 763,000