Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Operating activities
Net loss	$ (40,608)	$ (17,962)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization expense	7,473	2,247
Stock-based expense	19,072	5,758
Bad debt expense	1,643	925
Excess tax benefit related to stock-based compensation	(365)
Changes in operating assets and liabilities:
Accounts receivable	(10,581)	(8,394)
Prepaid expenses and other current assets	257	529
Other non-current assets	1,161	(361)
Accounts payable	521	2,005
Accrued expenses and other current liabilities	7,027	5,125
Deferred revenue	4,647	9,971
Other liabilities, long-term	(2,952)	1
Net cash used in operating activities	(12,705)	(156)
Investing activities
Acquisitions, net of cash acquired, and purchase of intangible asset	(60,750)
Purchases of property, equipment and capitalized internal-use software development costs	(8,004)	(3,806)
Purchases of short-term investments	(74,578)
Proceeds from sale of short-term investments	43,783
Increase in restricted cash		(250)
Net cash used in investing activities	(99,549)	(4,056)
Financing activities
Payments of initial stock offering costs		(938)
Proceeds received from follow-on stock offering, net of costs	51,943
Proceeds from exercise of stock options	9,470	2,478
Excess tax benefit related to stock-based compensation	365
Net cash provided by financing activities	61,778	1,540
Effect of exchange rate fluctuations on cash and cash equivalents	(46)	(73)
Net decrease in cash and cash equivalents	(50,522)	(2,745)
Cash and cash equivalents at beginning of period	74,367	15,050
Cash and cash equivalents at end of period	23,845	12,305
Supplemental disclosure of other cash flow information:
Cash paid for income taxes	236	105
Supplemental disclosure of non-cash investing and financing activities:
Accretion of redeemable convertible preferred stock		35
Accrued stock offering costs		1,600
Issuance of stock for acquisition	$ 125,497