Acquisitions - MI (Details)	Sep. 14, 2015 USD ($) employee project	Jul. 31, 2016 USD ($)	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)
Net Assets
Goodwill		$ 280,318,000	$ 241,951,000	$ 231,647,000
Medical Innovations Group Holdings Limited
Acquisitions
Pre-acquisition annual revenues	$ 28,500,000
Number of individuals in employee base | employee	100
Total consideration for the transaction, excluding acquisition-related costs	$ 79,597,000
Estimated net asset value adjustment	212,000
Net Assets
Current assets	7,060,000
Property, plant and equipment	6,464,000
Current liabilities	(2,640,000)
Deferred income tax liabilities	(8,683,000)
Net assets acquired	$ 39,591,000
Amortizable intangible assets, useful life	15 years
Number of in-process research and development projects acquired | project	0
Goodwill	$ 40,006,000
Goodwill deductible for income tax purposes	0
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	$ 2,030,000
Amortizable intangible assets, useful life	12 years