Purchase Price (Parenthetical) (Detail)	12 Months Ended
	Apr. 30, 2013
Power Reviews | Developed Technology
Business Acquisition [Line Items]
Useful life	3 years
Power Reviews | Minimum | Customer Relationships
Business Acquisition [Line Items]
Useful life	3 years
Power Reviews | Maximum | Customer Relationships
Business Acquisition [Line Items]
Useful life	10 years
Longboard Media, Inc | Customer Relationships
Business Acquisition [Line Items]
Useful life	10 years