CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Operating activities:
Net loss	$ (63,752)	$ (24,329)	$ (20,057)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	10,900	3,108	2,311
Stock-based expense	22,453	7,710	4,681
Revaluation of contingent consideration	(1,000)
Bad debt expense	2,859	1,083	482
Excess tax benefit related to stock-based expense	(510)	(78)
Changes in operating assets and liabilities:
Accounts receivable	(10,749)	(5,566)	(4,974)
Prepaid expenses and other current assets	(1,766)	(1,132)	(1,983)
Other non-current assets	(432)	(298)	94
Accounts payable	974	808	419
Accrued expenses and other current liabilities	13,283	5,176	3,284
Deferred revenue	8,633	13,432	15,049
Other liabilities, long-term	(2,699)	(234)	47
Net cash used in operating activities	(21,806)	(320)	(647)
Investing activities:
Acquisitions, net of cash acquired	(60,750)
Purchases of property, equipment and capitalized internal-use software development costs	(10,853)	(5,119)	(2,282)
Purchases of short-term investments	(90,828)	(50,884)
Proceeds from maturities of short-term investments	61,310
Proceeds from sale of short-term investments	10,032
Increase in restricted cash		(250)
Net cash used in investing activities	(91,089)	(56,253)	(2,282)
Financing activities:
Proceeds from initial public offering, net of offering costs		112,778
Proceeds from follow-on stock offering, net of costs	51,943
Proceeds from exercise of stock options	11,226	3,049	2,068
Excess tax benefit related to stock-based expense	510	78
Net cash provided by financing activities	63,679	115,905	2,068
Effect of exchange rate fluctuations on cash and cash equivalents	(106)	(15)	(125)
Net change in cash and cash equivalents	(49,322)	59,317	(986)
Cash and cash equivalents at beginning of period	74,367	15,050	16,036
Cash and cash equivalents at end of period	25,045	74,367	15,050
Supplemental disclosure of other cash flow information:
Cash paid for income taxes	440	330	523
Supplemental disclosure of non-cash investing and financing activities:
Purchase of intangible asset recorded in accrued expenses and other current liabilities	705
Accretion of redeemable convertible preferred stock		38	46
Issuance of stock for acquisition	$ 125,497