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Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization expense of intangible assets $ 0.4 $ 0.3
Fiscal 2021 0.4  
Fiscal 2022 0.4  
Fiscal 2023 0.4  
Fiscal 2024 0.2  
Fiscal 2025 $ 0.2