Restructuring Charges - Additional Information (Detail) (Ultrasonix)	12 Months Ended
Jul. 31, 2013 Employee
Ultrasonix
Restructuring Cost and Reserve [Line Items]
Involuntarily terminated employees	126

The number of positions eliminated during the period as a result of restructuring activities.

No definition available.

Name:	us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration