Annual report pursuant to Section 13 and 15(d)

Employee benefit plan (Details)

v2.4.0.8
Employee benefit plan (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Employee benefit plan (Details) [Line Items]      
Employer Matched Contributions Percentage Of The Employees Contribution 50.00% 50.00% 50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent 10.00% 10.00% 10.00%
Share Based 401k Employer Match Expense (in Dollars) $ 636 $ 643 $ 649
Defined Contribution Plan Minimum Annual Contribution Percent 13.00%    
Minimum Age of Employee for Saving Contribution 25 years    
Defined Benefit Plan Minimum Annual Investment Return Percentage 2.00%    
Defined Contribution Pension Plan Expiration Date Dec. 31, 2014    
Swiss Employees [Member]
      
Employee benefit plan (Details) [Line Items]      
Employer Matched Contributions Percentage Of The Employees Contribution 50.00%