Acquired Intangible Assets Net (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	$ 57,438
Accumulated Amortization	(5,514)
Net Book Value	51,924
Domain name
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	800
Net Book Value	800
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	51,238
Accumulated Amortization	(3,924)
Net Book Value	47,314
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Fair Value	5,400
Accumulated Amortization	(1,590)
Net Book Value	$ 3,810