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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Income Taxes      
Repatriated dividends $ 0 $ 0  
Cumulative amount of undistributed earnings indefinitely reinvested outside the United States $ 23,395,000    
Reconciliation of the beginning and ending amounts of gross unrecognized tax benefits      
Unrecognized tax benefits at the beginning of the period     $ 124,000
Activity during period     $ (124,000)