Acquired Intangible Assets Net (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2013	Apr. 30, 2013
Acquired Finite Lived and Indefinite Lived Intangible Assets [Line Items]
Gross Fair Value	$ 57,438	$ 57,438
Accumulated Amortization	(9,023)	(5,514)
Net Book Value	48,415	51,924
Acquired finite-lived intangible assets, net book value	47,615
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	51,238	51,238
Accumulated Amortization	(6,533)	(3,924)
Acquired finite-lived intangible assets, net book value	44,705	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	(2,490)	(1,590)
Acquired finite-lived intangible assets, net book value	$ 2,910	$ 3,810