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Acquisitions - NAMSA (Details)
Mar. 01, 2016
USD ($)
project
Apr. 30, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Net Assets        
Goodwill   $ 284,018,000 $ 241,951,000 $ 231,647,000
North American Science Associates Inc        
Acquisitions        
Pre-acquisition annual revenues $ 5,700,000      
Total consideration for the transaction, excluding acquisition-related costs 13,520,000      
Net Assets        
Current assets 2,233,000      
Property, plant and equipment 437,000      
Current liabilities (123,000)      
Net assets acquired $ 9,807,000      
Amortizable intangible assets, useful life 10 years      
Number of in-process research and development projects acquired | project 0      
Goodwill $ 3,713,000      
Goodwill deductible for income tax purposes 3,713,000      
North American Science Associates Inc | Customer relationships        
Net Assets        
Amortizable intangible assets $ 5,940,000      
Amortizable intangible assets, useful life 10 years      
North American Science Associates Inc | Technology        
Net Assets        
Amortizable intangible assets $ 1,320,000      
Amortizable intangible assets, useful life 8 years