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Commitments and Contingencies (Details Textual)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Jul. 31, 2011
USD ($)
Apr. 30, 2013
USD ($)
Apr. 30, 2012
USD ($)
Apr. 30, 2013
PLN
letter_of_credit
sqft
Jul. 31, 2012
letter_of_credit
Apr. 30, 2013
Line of Credit Associated With Operating Lease [Domain]
USD ($)
Apr. 30, 2013
Unsecured Line of Credit Associated with Customer Agreement [Domain]
USD ($)
Line of Credit Facility [Line Items]                  
Duration of lease for a facility to serve as its corporate headquarters       7 years          
Rentable area of current corporate headquarters           97,674      
Line of Credit Facility, Maximum Borrowing Capacity           10.0   $ 1.2 $ 3.1
Lease expense for all worldwide facilities and equipment 1.4 1.6   3.8 3.5        
Sublease Income   0.3     0.9        
Number of Letter of Credit Agreements Outstanding           0 3    
Payment in connection with settlement     10.0            
Additional payment in case of successful appeal 20.0                
Payment required to discharge potential obligation prior to initial determination by court $ 15.0