Annual report pursuant to Section 13 and 15(d)

401 (k) Plan (Details)

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401 (k) Plan (Details) - USD ($)
12 Months Ended
May. 15, 2012
Jul. 31, 2015
401 (k) Plan    
Maximum percentage of contribution permitted to employees on eligible compensation 100.00%  
Employer's matching contribution (as a percent)   100.00%
Employer's matching contribution of employee's annual contribution (as a percent)   6.00%
Employer matching contributions made   $ 133,000