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Schedule of Information About Contract Liability Balance (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2021
Apr. 30, 2020
Revenue from Contract with Customer [Abstract]        
Revenue recognized in the period from amounts included in the contract liability balance at the beginning of the period $ 21,926 $ 23,572 $ 27,665 $ 31,288