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Acquisitions - International Medical Service (Details)
Nov. 03, 2014
USD ($)
project
Jan. 31, 2016
USD ($)
Jul. 31, 2015
USD ($)
Jul. 31, 2014
USD ($)
Net Assets        
Goodwill   $ 277,847,000 $ 241,951,000 $ 231,647,000
International Medical Service S.r.l.        
Acquisitions        
Pre-acquisition annual revenues $ 13,500,000      
Total consideration for the transaction, excluding acquisition-related costs 24,610,000      
Amount of assumed debt 2,498,000      
Net Assets        
Current assets 8,111,000      
Property, plant and equipment 7,922,000      
Other assets 177,000      
Current liabilities (5,735,000)      
Deferred income tax liabilities (3,028,000)      
Other long-term liabilities (1,020,000)      
Net assets acquired $ 13,477,000      
Amortizable intangible assets, useful life 9 years      
Number of in-process research and development projects acquired | project 0      
Goodwill $ 11,133,000      
Goodwill deductible for income tax purposes 0      
International Medical Service S.r.l. | Customer relationships        
Net Assets        
Amortizable intangible assets $ 5,669,000      
Amortizable intangible assets, useful life 9 years      
International Medical Service S.r.l. | Technology        
Net Assets        
Amortizable intangible assets $ 1,381,000      
Amortizable intangible assets, useful life 9 years