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Leases - Lessor (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Jul. 31, 2021
Leases [Abstract]      
Property subject to or available for operating lease gross $ 57.2   $ 55.5
Property subject to or available for operating lease accumulated depreciation 2.3   $ 1.9
Operating lease income $ 3.5 $ 3.6