Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 206,078	$ 132,179
Short-term investments	304,731	214,024
Accounts receivable, net of allowance for doubtful accounts of $651 and $542, respectively	65,648	144,798
Prepaid expenses and other current assets	13,372	9,963
Total current assets	589,829	500,964
Property and equipment, net	48,169	47,469
Goodwill	95,804	95,804
Intangible assets, net	41,333	47,500
Deferred income taxes, noncurrent	9,238	9,359
Other long-term assets	4,101	4,703
Total assets	788,474	705,799
Current liabilities:
Accounts payable	5,048	4,600
Accrued compensation and benefits	9,875	12,451
Accrued expenses and other current liabilities	10,794	11,059
Income tax payable	4,848	750
Deferred revenue	137,051	157,419
Total current liabilities	167,616	186,279
Deferred income taxes, noncurrent	9,535	10,622
Other long-term liabilities	5,418	3,649
Total liabilities	182,569	200,550
Commitments and contingencies (Note 11)
Stockholders’ equity:
Additional paid-in capital	415,103	361,691
Accumulated other comprehensive income	319	172
Retained earnings	190,482	143,385
Total stockholders’ equity	605,905	505,249
Total liabilities and stockholders’ equity	788,474	705,799
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1