Business Combination - Additional Information (Detail) (USD $)	12 Months Ended						0 Months Ended	3 Months Ended	12 Months Ended				1 Months Ended			1 Months Ended	3 Months Ended			12 Months Ended		12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013 Engineering Services	Jul. 31, 2012 Engineering Services	Jul. 31, 2014 Maximum	Sep. 20, 2013 PocketSonics	Oct. 31, 2013 PocketSonics	Jul. 31, 2014 PocketSonics	Sep. 20, 2013 PocketSonics	Apr. 30, 2010 PocketSonics	Sep. 20, 2013 PocketSonics Maximum	May 31, 2014 PocketSonics In-process research and development	Sep. 20, 2013 PocketSonics In-process research and development	Apr. 30, 2010 PocketSonics In-process research and development	Jul. 31, 2013 Ultrasonix	Jul. 31, 2013 Ultrasonix	Apr. 30, 2013 Ultrasonix	Jan. 31, 2013 Ultrasonix	Jul. 31, 2014 Ultrasonix	Mar. 02, 2013 Ultrasonix	Jul. 31, 2014 Ultrasonix General and Administrative	Jul. 31, 2013 Ultrasonix General and Administrative	Jul. 31, 2014 Ultrasonix Cost of product sales	Jul. 31, 2014 Ultrasonix Selling and Marketing
Business Acquisition [Line Items]
Ownership interests						50.00%					10.00%
Amount of equity investment															$ 1,900,000
Amount merger consideration paid							11,100,000
Contingent Consideration									2,100,000	1,900,000		3,000,000
Intangible assets														11,500,000							25,300,000
Amortization period													10 years
Estimated increases in contingent consideration	125,000	(25,000)	120,000						200,000
Business acquisition, goodwill	56,955,000	50,073,000							2,800,000	6,900,000											48,200,000
Loss from pre-acquisition equity interest								500,000	500,000
Acquisition related cost									100,000								3,100,000	1,900,000	700,000	8,700,000			5,600,000
Engineering services expense				900,000	1,500,000
Purchase price, net of cash acquired	10,561,000	79,273,000														79,900,000
Weighted average amortization period for intangible assets																				10 years
Business Acquisition, Goodwill Expected Tax Deductible Period																				15 years
Amortization expense related to acquired intangible assets	7,800,000	4,100,000	3,100,000																			7,800,000		2,400,000	5,400,000
Inventory fair value step up charge																							3,000,000	600,000
Intangible and deferred revenue amortization																							1,400,000
Legal and due diligence related expenses																							$ 1,200,000