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Real Estate Development - Schedule of Real Estate Development Assets (Details) - USD ($)
$ in Thousands
Oct. 31, 2019
Jul. 31, 2019
Oct. 31, 2018
Real Estate Properties [Line Items]      
Real estate development assets $ 17,602 $ 17,602 $ 107,162
East Area I      
Real Estate Properties [Line Items]      
Real estate development assets   0 91,357
Retained property - East Area I      
Real Estate Properties [Line Items]      
Real estate development assets $ 11,943 11,943 10,408
East Area II      
Real Estate Properties [Line Items]      
Real estate development assets   $ 5,659 $ 5,397