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Restructuring and Related Charges by Segment (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ (107)us-gaap_RestructuringCharges	$ (80)us-gaap_RestructuringCharges	$ (317)us-gaap_RestructuringCharges	$ 216us-gaap_RestructuringCharges
Medical Imaging
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	(100)		(200)	(200)
Ultrasound
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net		$ (100)	$ (100)	$ 400

- 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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