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Additional Balance Sheet Information
 9 Months Ended
Apr. 30, 2021
Additional Balance Sheet Information [Abstract]  
Supplemental Balance Sheet Disclosures Additional Balance Sheet Information
Inventories
Inventories as of April 30, 2021, and July 31, 2020, consisted of the following:
 April 30, 2021July 31, 2020
Finished products$78,484 $85,547 
Work-in-process20,886 24,044 
Raw materials and supplies23,477 26,071 
Total inventories$122,847 $135,662 
Property, plant and equipment
Property, plant and equipment is presented net of accumulated depreciation in the amount of $274,961 and $276,248 as of April 30, 2021, and July 31, 2020, respectively.