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Fair Value Measurements (Tables)
 12 Months Ended
Jul. 31, 2021
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Accounted for at Fair Value on a Recurring Basis
The following table summarizes the Company's financial assets and liabilities that were accounted for at fair value on a recurring basis at July 31, 2021 and July 31, 2020, according to the valuation techniques the Company used to determine their fair values.
 July 31, 2021July 31, 2020Fair Value Hierarchy
Assets:
Trading securities$20,135 $18,606 Level 1
Foreign exchange contracts150 594 Level 2
Liabilities:
Foreign exchange contracts$51 $777 Level 2