Acquired Intangible Assets, Net, Resulting From Acquisition of Powerreviews and Longboard Media (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2014	Apr. 30, 2013
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Gross Fair Value	$ 57,466	$ 57,438
Accumulated Amortization	(10,777)	(5,514)
Net Book Value	46,689	51,924
Acquired finite-lived intangible assets, net book value	45,889
Domain name
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired indefinite lived intangible assets	800	800
Customer Relationships
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, gross	51,266	51,238
Accumulated Amortization	(7,837)	(3,924)
Acquired finite-lived intangible assets, net book value	43,429	47,314
Developed Technology
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets, gross	5,400	5,400
Accumulated Amortization	(2,940)	(1,590)
Acquired finite-lived intangible assets, net book value	$ 2,460	$ 3,810