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Subsequent Events (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 28, 2019
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Sale of Majority Interest in Consolidated Subsidiary [Abstract]          
Proceeds from sale of majority interest in consolidated subsidiary     $ 0 $ 75 $ 150
Forecast [Member]          
Staff Reduction Programs [Abstract]          
Expected savings due to staff reduction and expense reduction initiatives   $ 6,000      
Employee severance and termination costs   $ 1,000      
Sale of Majority Interest in Consolidated Subsidiary [Abstract]          
Proceeds from sale of majority interest in consolidated subsidiary $ 1,000        
Loss from sale of majority interest in consolidated subsidiary $ 1,000