Restructuring and Related Charges by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ (0.1)	$ 0.5	$ 0.2	$ 0.5
Medical Imaging
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net		0.1	(0.2)	0.1
Ultrasound
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ (0.1)	$ 0.4	$ 0.4	$ 0.4