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Additional Balance Sheet Information
 6 Months Ended
Jan. 31, 2021
Additional Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Disclosures [Text Block] Additional Balance Sheet Information
Inventories
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 
Property, plant and equipment
Property, plant and equipment is presented net of accumulated depreciation in the amount of $272,945 and $276,248 as of January 31, 2021, and July 31, 2020, respectively.