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Derivatives and Hedging Activities - Impact on OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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