Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Cash flows from operating activities
Net income	$ 6,525	$ 5,749	$ 17,368	$ 13,099
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	774	174	1,552	536
Amortization of premiums on short-term investments	98	23	276	23
Stock-based compensation	2,086	181	4,036	490
Deferred income taxes	(86)	(192)	(259)	(447)
Bad debt expense	(303)	123	(21)	345
Changes in operating assets and liabilities:
Accounts receivable	(9,417)	(7,196)	(9,852)	(8,849)
Income taxes	(1,750)	2,541	(5,733)	3,379
Other current and non-current assets	(1,224)	(335)	(2,117)	(243)
Accounts payable	1,157	332	(946)	176
Accrued expenses	1,720	3,018	5,859	3,840
Deferred revenue	5,254	5,049	14,607	11,656
Long-term liabilities	433	249	758	(193)
Net cash provided by operating activities	5,267	9,716	25,528	23,812
Cash flows from investing activities
Purchases of short-term investments	(4,315)	(9,888)	(7,086)	(9,888)
Maturities and sales of investments	2,250		4,850
Purchases of property and equipment	(460)	(262)	(1,561)	(716)
Acquisitions, net of cash acquired			(12,149)
Payments for capitalized internal-use software	(720)	(257)	(1,013)	(590)
Proceeds from (issuance of) note receivable-related party			253	(2)
Payments for restricted cash and deposits	(5)	(64)	(2)	(359)
Net cash used in investing activities	(3,250)	(10,471)	(16,708)	(11,555)
Cash flows from financing activities
Proceeds from early exercise of common stock options	158	197	225	423
Proceeds from exercise of common stock options	95	37	472	78
Net proceeds from initial public offering	216,263		215,734
Net cash provided by financing activities	216,516	234	216,431	501
Net change in cash and cash equivalents	218,533	(521)	225,251	12,758
Cash and cash equivalents at beginning of period	38,608	30,159	31,890	16,880
Cash and cash equivalents at end of period	257,141	29,638	257,141	29,638
Supplemental disclosures of other cash flow information:
Cash paid for income taxes	4,998	669	14,984	4,058
Non-cash investing and financing activities:
Property and equipment included in accounts payable and accrued expenses	(46)		(20)	79
Vesting of early exercised stock options	212	55	460	179
Offering costs not yet paid	$ 805		$ 1,473