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Restructuring Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Jan. 31, 2013	Jan. 31, 2013	Apr. 30, 2014	Apr. 30, 2013	Jul. 31, 2013 Ultrasonix Employee
Restructuring Cost and Reserve [Line Items]
Involuntarily terminated employees							115
Restructuring charges	$ (80)	$ 496	$ 0	$ 0	$ 216	$ 496

- Definition

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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