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Stock-Based Compensation (Tables)
9 Months Ended
Apr. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Common stock options granted, forfeited or expired and exercised

    Options   Weighted Average Exercise Price per Share   Aggregate Intrinsic Value
Outstanding: Aug. 1, 2016 and April 30, 2017       19,639     $ 28.66     $ 63,321  
Exercisable, April 30, 2017       19,639     $ 28.66     $ 63,321