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Fair Value Measurements (Details 2) - Level 3 [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance, beginning of period $ 370
Transfer into Level 3 from acquisition (see Note 8) 375
Total losses recognized in "Foreign currency translation adjustments" (5) (10)
Balance, end of period 365 365
Change in unrealized gains or losses for the period included in earnings for liabilities held at the end of the period