Purchase Price (Parenthetical) (Detail)	9 Months Ended
	Jan. 31, 2013
PowerReviews, Inc. | Developed Technology
Business Acquisition [Line Items]
Useful life	3 years
PowerReviews, Inc. | Minimum | Customer Relationships
Business Acquisition [Line Items]
Useful life	3 years
PowerReviews, Inc. | Maximum | Customer Relationships
Business Acquisition [Line Items]
Useful life	10 years
Longboard Media, Inc | Customer Relationships
Business Acquisition [Line Items]
Useful life	10 years