Consolidated Balance Sheets - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Current assets:
Cash and cash equivalents	$ 132,179	$ 129,253
Short-term investments	214,024	268,620
Accounts receivable, net of allowance for doubtful accounts of $542 and $413, respectively	144,798	92,661
Deferred income taxes		4,815
Prepaid expenses and other current assets	9,963	6,488
Total current assets	500,964	501,837
Property and equipment, net	47,469	28,203
Capitalized internal-use software, net	979	1,240
Goodwill	95,804	4,850
Intangible assets, net	47,500	4,904
Deferred income taxes, noncurrent	9,359
Other long-term assets	3,724	3,856
Total assets	705,799	544,890
Current liabilities:
Accounts payable	4,600	3,886
Accrued compensation and benefits	12,451	6,497
Accrued expenses and other current liabilities	11,059	8,939
Income tax payable	750	3,241
Deferred revenue	157,419	112,960
Total current liabilities	186,279	135,523
Deferred income taxes, noncurrent	10,622	170
Other long-term liabilities	3,649	2,364
Total liabilities	$ 200,550	$ 138,057
Commitments and contingencies (Note 13)
Stockholders’ equity:
Additional paid-in capital	$ 361,691	$ 317,881
Accumulated other comprehensive income	172	26
Retained earnings	143,385	88,925
Total stockholders’ equity	505,249	406,833
Total liabilities and stockholders’ equity	705,799	$ 544,890
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1
Class B common stock [Member]
Stockholders’ equity:
Common stock		$ 1