Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Operating activities:
Net loss (excluding accretion)	$ (63,166)	$ (63,752)	$ (24,329)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	15,068	10,900	3,108
Impairment of acquired intangible assets	2,500
Estimated loss on disposal of discontinued operations, net of tax	9,192
Stock-based expense	14,468	22,453	7,710
Revaluation of contingent consideration	(3,270)	(1,000)
Bad debt expense	1,902	2,859	1,083
Excess tax benefit related to stock-based expense	(216)	(510)	(78)
Other non-cash expense (benefit)	480	(5)
Changes in operating assets and liabilities:
Accounts receivable	(12,081)	(10,749)	(5,566)
Prepaid expenses and other current assets	(1,551)	(1,766)	(1,132)
Other non-current assets	(1,603)	(432)	(298)
Accounts payable	(3,095)	974	808
Accrued expenses and other current liabilities	(2,623)	13,283	5,176
Deferred revenue	2,040	8,633	13,432
Other liabilities, long-term	(1,512)	(2,699)	(234)
Net cash used in operating activities	(43,467)	(21,811)	(320)
Investing activities:
Acquisitions, net of cash acquired, and purchase of intangible asset	(9,616)	(60,750)
Purchases of property, equipment and capitalized internal-use software development costs	(10,661)	(10,853)	(5,119)
Purchases of short-term investments	(60,092)	(90,828)	(50,884)
Proceeds from maturities of short-term investments	58,478	61,310
Proceeds from sale of short-term investments	31,098	10,037
Increase in restricted cash			(250)
Net cash provided by (used in) investing activities	9,207	(91,084)	(56,253)
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 employee stock compensation plans	13,499	11,226	3,049
Proceeds from revolving line of credit	27,000
Excess tax benefit related to stock-based expense	216	510	78
Net cash provided by financing activities	40,715	63,679	115,905
Effect of exchange rate fluctuations on cash and cash equivalents	434	(106)	(15)
Net change in cash and cash equivalents	6,889	(49,322)	59,317
Cash and cash equivalents at beginning of period	25,045	74,367	15,050
Cash and cash equivalents at end of period	31,934	25,045	74,367
Supplemental disclosure of other cash flow information:
Cash paid for income taxes	1,493	440	330
Cash paid for interest	137
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
Issuance of stock for acquisition		$ 125,497