Acquisitions - Fiscal 2016 (Details)
Mar. 01, 2016
USD ($)
Sep. 14, 2015
USD ($)
employee
project
Jan. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Net Assets          
Goodwill     $ 277,847,000 $ 241,951,000 $ 231,647,000
North American Science Associates Inc | Subsequent Events          
Net Assets          
Pre-acquisition annual revenues $ 5,700,000        
Total consideration for the transaction, excluding acquisition-related costs $ 13,520,000        
Medical Innovations Group Holdings Limited          
Net Assets          
Current assets   $ 7,990,000      
Property, plant and equipment   6,464,000      
Current liabilities   (2,730,000)      
Deferred income tax liabilities   (8,530,000)      
Net assets acquired   $ 40,583,000      
Number of in-process research and development projects acquired | project   0      
Goodwill   $ 38,973,000      
Goodwill deductible for income tax purposes   0      
Pre-acquisition annual revenues   $ 28,500,000      
Number of individuals in employee base | employee   100      
Total consideration for the transaction, excluding acquisition-related costs   $ 79,556,000      
Estimated net asset value adjustment   254,000      
Medical Innovations Group Holdings Limited | Customer relationships          
Net Assets          
Amortizable intangible assets   $ 24,430,000      
Amortizable intangible assets, useful life   17 years      
Medical Innovations Group Holdings Limited | Technology          
Net Assets          
Amortizable intangible assets   $ 10,930,000      
Amortizable intangible assets, useful life   10 years      
Medical Innovations Group Holdings Limited | Brand names          
Net Assets          
Amortizable intangible assets   $ 2,029,000      
Amortizable intangible assets, useful life   12 years