Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Reportable Segment Information (Parenthetical) (Detail) (USD $)	1 Months Ended	3 Months Ended		12 Months Ended		3 Months Ended		12 Months Ended			3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended			3 Months Ended
	May 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014 Ultrasonix	Jul. 31, 2013 Ultrasonix	Jul. 31, 2014 Medical Imaging	Jul. 31, 2013 Medical Imaging	Jul. 31, 2012 Medical Imaging	Jul. 31, 2014 Medical Imaging Ultrasonix	Jul. 31, 2014 Ultrasound	Jul. 31, 2013 Ultrasound	Jul. 31, 2014 Ultrasound Ultrasonix	Jul. 31, 2014 Security Technology	Jul. 31, 2013 Security Technology	Jul. 31, 2012 Security Technology	Jul. 31, 2014 Security Technology Ultrasonix
Segment Reporting Information [Line Items]
Restructuring charges	$ 3,500,000	$ 3,000,000	$ 500,000	$ 3,483,000	$ 3,519,000	$ 2,900,000		$ 1,700,000	$ 1,100,000		$ 1,900,000	$ 1,400,000	$ 2,200,000	$ 500,000	$ 400,000	$ 200,000		$ 500,000
Consulting fees										2,200,000							500,000
Intangible assets, net		55,525,000		57,366,000	55,525,000	19,900,000	24,200,000	26,000,000	29,400,000
Cash equivalents and marketable securities		$ 57,400,000		$ 60,900,000	$ 57,400,000