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Derivative Gains and Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2020 | Jan. 31, 2019 | Jan. 31, 2020 | Jan. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Foreign Currency Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | $ 105 | $ 240 | $ 486 | $ 287
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Net gain recognized in other comprehensive loss (income) | 363 | 537 | 559 | 157
Net Investment Hedging [Member] |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Net gain recognized in other comprehensive loss (income) | $ 531 | $ (598) | $ 553 | $ 1,022

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