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Inventories (Tables)
6 Months Ended
Jan. 31, 2022
Inventory Disclosure [Abstract]  
Inventories
Inventories consist of the following at:
 January 31, 2022July 31, 2021
Raw materials and components$66,162,000 62,249,000 
Work-in-process and finished goods46,073,000 38,338,000 
Total inventories112,235,000 100,587,000 
Less reserve for excess and obsolete inventories21,961,000 20,229,000 
Inventories, net$90,274,000 80,358,000