Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Condensed Consolidated Statements of Operations [Abstract]
Revenue	$ 35,662	$ 22,088
Cost of revenue	12,633	7,797
Gross profit	23,029	14,291
Operating expenses:
Sales and marketing	15,322	11,192
Research and development	7,494	3,343
General and administrative	16,196	5,099
Acquisition related	1,384
Amortization of Acquired Intangible Assets	480
Total operating expenses	40,876	19,634
Operating loss	(17,847)	(5,343)
Other income (expense), net
Interest income	49	7
Other income (expense)	(453)	(91)
Total other (expense), net	(404)	(84)
Loss before income taxes	(18,251)	(5,427)
Income tax expense	288	109
Net loss	(18,539)	(5,536)
Less accretion of redeemable convertible preferred stock		(13)
Net loss applicable to common stockholders	$ (18,539)	$ (5,549)
Net loss per share applicable to common stockholders:
Basic and diluted	$ 0.30	$ (0.29)
Basic and diluted weighted average number of shares outstanding	62,451	18,817