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Summary of Significant Accounting Policies (Details Textuals)
$ in Millions
12 Months Ended
Jul. 31, 2021
USD ($)
Segment
Jul. 31, 2020
USD ($)
Jul. 31, 2019
USD ($)
Accounting Policies [Abstract]      
Advertising expenses | $ $ 13.7 $ 7.7 $ 7.5
Number of operating segments 2    
Number of reportable segment 2