Restructuring and Related Charges by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jan. 31, 2014	Jan. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 0.3	$ 0.3
Medical Imaging
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	(0.1)	(0.2)
Ultrasound
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges, net	$ 0.4	$ 0.5