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Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2018
Apr. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning balance $ 0 $ 1,138 $ 1,138 $ 1,138
Original fair value of contingent consideration 1,292 0 1,292 0
Foreign currency translation (30) 0 (30) 0
Net settlements 0 0 (1,138) 0
Ending Balance $ 1,262 $ 1,138 $ 1,262 $ 1,138