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Derivatives and Hedging Activities - Impact on OCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Jul. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) recognized in other comprehensive income (loss) $ 1,451 $ (576) $ 837
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net $ 399 $ 614 1,048
Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net gain (loss) recognized in other comprehensive income (loss)     $ 837