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Additional Balance Sheet Disclosures (Tables)
3 Months Ended
Oct. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories as of October 31, 2020, and July 31, 2020, consisted of the following:
 October 31, 2020July 31, 2020
Finished products$74,933 $85,547 
Work-in-process20,815 24,044 
Raw materials and supplies24,472 26,071 
Total inventories$120,220 $135,662