Business Combination - Additional Information (Detail) (USD $)	3 Months Ended					1 Months Ended	3 Months Ended			3 Months Ended			3 Months Ended				3 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Jul. 31, 2013	Oct. 31, 2013 Minimum	Oct. 31, 2013 Maximum	Sep. 20, 2013 PocketSonics	Oct. 31, 2013 PocketSonics	Apr. 30, 2010 PocketSonics	Sep. 20, 2013 PocketSonics Maximum	Oct. 31, 2013 PocketSonics In Process Research And Development	Sep. 20, 2013 PocketSonics In Process Research And Development	Apr. 30, 2010 PocketSonics In Process Research And Development	Oct. 31, 2013 PocketSonics In Process Research And Development Minimum	Oct. 31, 2013 PocketSonics In Process Research And Development Maximum	Oct. 31, 2013 Ultrasonix	Mar. 02, 2013 Ultrasonix	Oct. 31, 2013 Ultrasonix General and Administrative	Oct. 31, 2013 Ultrasonix Cost of product sales
Business Acquisition [Line Items]
Ownership interests				10.00%	50.00%			10.00%
Amount of equity investment												$ 1,900,000
Amount merger consideration paid						11,100,000
Contingent consideration						1,900,000			3,000,000
Intangible assets											11,500,000					25,300,000
Amortization period										10 years
Production period													6 months	18 months
Business acquisition, goodwill	56,978,000		50,073,000			6,900,000	2,800,000									48,200,000
Loss from pre-acquisition equity interest							500,000
Acquisition related cost							100,000								2,400,000
Purchase price, net of cash acquired																79,900,000
Intangible amortization expense	1,900,000	800,000															1,900,000
Inventory step up expense																		$ 500,000