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Revenue Recognition (Details 4) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Revenue Recognition and Deferred Revenue [Abstract]        
Amortization of deferred customer contract acquisition costs $ 616 $ 466 $ 1,781 $ 1,218