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Fair Value Measurements (Tables)
 3 Months Ended
Oct. 31, 2020
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 October 31, 2020 and July 31, 2020:
 October 31, 2020July 31, 2020Fair Value Hierarchy
Assets:
Trading securities$17,434 $18,606 Level 1
Foreign exchange contracts1,017 594 Level 2
Liabilities:
Foreign exchange contracts449 777 Level 2