Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities
Net income	$ 23,615	$ 18,783	$ 4,230
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,410	789	407
Amortization of premiums on short-term investments	364	101
Stock-based compensation	6,950	715	434
Deferred income taxes	(1,781)	(639)	530
Bad debt expense	35	540	300
Changes in operating assets and liabilities:
Accounts receivable	(19,738)	(17,067)	(12,838)
Income taxes	(4,784)	5,124	(988)
Other current and non-current assets	(2,951)	(593)	(296)
Accounts payable	(1,303)	1,747	416
Accrued expenses	9,690	(4)	4,784
Deferred revenue	28,473	20,860	7,511
Long-term liabilities	773	443	246
Net cash provided by operating activities	41,753	30,799	4,736
Cash flows from investing activities
Purchases of short-term investments	(21,403)	(14,372)
Maturities and sales of investments	9,700
Purchases of property and equipment	(1,860)	(964)	(650)
Acquisitions, net of cash acquired	(12,149)
Payments for capitalized internal-use software	(1,117)	(590)	(543)
Proceeds from (issuance of) note receivable-related party	253	(3)	(250)
Payments for restricted cash and deposits		(435)	(240)
Net cash used in investing activities	(26,576)	(16,364)	(1,683)
Cash flows from financing activities
Proceeds from early exercise of common stock options	229	439	43
Proceeds from exercise of common stock options	514	136	6
Net proceeds from initial public offering	214,523
Excess tax benefits from stock-based compensation	174
Net cash provided by financing activities	215,440	575	49
Net change in cash and cash equivalents	230,617	15,010	3,102
Cash and cash equivalents at beginning of period	31,890	16,880	13,778
Cash and cash equivalents at end of period	262,507	31,890	16,880
Supplemental disclosures of other cash flow information:
Cash paid for income taxes	20,673	5,659	2,636
Non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued expenses	18	80
Vesting of early exercised stock options	572	224	260
Offering costs not yet paid	$ 323