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Earnings per Share (Details 2)	3 Months Ended
Earnings per Share (Details 2)	Oct. 31, 2014	Oct. 31, 2013
Stock options to purchase common stock
Net Income (Loss) Per Share (Textual) [Abstract]
Schedule of antidilutive securities excluded from EPS	2,386,474	3,602,105
Restricted stock units
Net Income (Loss) Per Share (Textual) [Abstract]
Schedule of antidilutive securities excluded from EPS	3,763,160	4,671,772

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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