Annual report pursuant to Section 13 and 15(d)

Employee benefit plan (Detail)

v2.4.0.6
Employee benefit plan (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Employer Matched Contributions Percentage Of The Employees Contribution 50.00%    
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 10.00%    
Share Based 401k Employer Match Expense (in Dollars) $ 649 $ 690 $ 1,115
Defined Contribution Plan Minimum Annual Contribution Percent 8.00%    
Defined Benefit Plan Minimum Annual Investment Return Percentage 2.00%    
Swiss Employees [Member]
     
Employer Matched Contributions Percentage Of The Employees Contribution 50.00%