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Restructuring Charges - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013	Jul. 31, 2013 Ultrasonix Employee
Restructuring Cost and Reserve [Line Items]
Involuntarily terminated employees					124
Restructuring charges	$ 335	$ 0	$ 296	$ 0

- 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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