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Other Operating Expense, Net (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Jul. 31, 2019
Other Operating Expense, Net (Textual)      
Accrual for non-income related taxes     $ 8,000
Straight Path [Member]      
Other Operating Expense, Net (Textual)      
Recorded insurance proceeds $ 400    
Legal fees $ 700 $ 200