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Additional Balance Sheet Information (Tables)
6 Months Ended
Jan. 31, 2021
Additional Balance Sheet Information [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories as of January 31, 2021, and July 31, 2020, consisted of the following:
 January 31, 2021July 31, 2020
Finished products$79,100 $85,547 
Work-in-process19,262 24,044 
Raw materials and supplies24,560 26,071 
Total inventories$122,922 $135,662