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Acquisitions - Jet Prep Ltd. (Details)
Nov. 05, 2013
USD ($)
project
Jul. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Net Assets        
Goodwill   $ 280,318,000 $ 241,951,000 $ 231,647,000
Jet Prep Ltd.        
Acquisitions        
Total consideration for the transaction, excluding transaction costs $ 5,350,000      
Contingent consideration liability $ 2,490,000 0    
Period over which potential cash contingent consideration is payable 7 years      
Assumed contingent obligation   1,138,000    
Net Assets        
Current assets $ 82,000      
Property, plant and equipment 65,000      
Current liabilities (104,000)      
Other long-term liabilities (1,716,000)      
Net assets acquired $ 2,057,000      
Number of in-process research and development projects acquired | project 0      
Goodwill $ 5,783,000      
Goodwill deductible for income tax purposes 0      
Jet Prep Ltd. | Accrued expenses        
Acquisitions        
Assumed contingent obligation, current   12,000    
Jet Prep Ltd. | Other long-term liabilities        
Acquisitions        
Assumed contingent obligation, noncurrent   $ 1,126,000    
Jet Prep Ltd. | Technology        
Net Assets        
Amortizable intangible assets $ 3,730,000      
Amortizable intangible assets, useful life 7 years      
Jet Prep Ltd. | Contingent consideration, payable to sellers        
Acquisitions        
Contingent consideration liability $ 2,490,000      
Increase in goodwill 2,490,000      
Jet Prep Ltd. | Contingent consideration, payable to Israeli Government        
Acquisitions        
Increase in goodwill 1,720,000      
Liabilities assumed 810,000      
Increase in accrued expenses 4,000      
Increase in other long-term liabilities $ 1,716,000      
Jet Prep Ltd. | Contingent consideration, payable to Israeli Government | Minimum        
Acquisitions        
Israeli Government's rate of return on investment 1      
Jet Prep Ltd. | Contingent consideration, payable to Israeli Government | Maximum        
Acquisitions        
Israeli Government's rate of return on investment 9