Business Combination - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended					6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended				6 Months Ended			6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013	Jan. 31, 2014 Minimum	Jan. 31, 2014 Maximum	Jan. 31, 2014 In-process research and development Minimum	Jan. 31, 2014 In-process research and development Maximum	Sep. 20, 2013 PocketSonics	Oct. 31, 2013 PocketSonics	Jan. 31, 2014 PocketSonics	Apr. 30, 2010 PocketSonics	Jan. 31, 2014 PocketSonics Additional	Sep. 20, 2013 PocketSonics Maximum	Jan. 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	Jan. 31, 2014 PocketSonics In-process research and development Minimum	Jan. 31, 2014 PocketSonics In-process research and development Maximum	Mar. 02, 2013 Ultrasonix	Jan. 31, 2014 Ultrasonix	Jan. 31, 2014 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		2,000,000		100,000	3,000,000
Intangible assets																	11,500,000				25,300,000
Amortization period																10 years
Production period								6 months	15 months										6 months	15 months
Business acquisition, goodwill	56,977,000		56,977,000		50,073,000					6,900,000		2,800,000									48,200,000
Loss from pre-acquisition equity interest											500,000	500,000
Acquisition related charges												100,000										1,900,000	4,300,000
Purchase price, net of cash acquired			10,561,000																		79,900,000
Amortization expense related to acquired intangible assets	1,900,000	800,000	3,800,000	1,500,000																				3,800,000
Inventory step up charge																									$ 500,000