Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Current assets:
Cash and cash equivalents	$ 210,365	$ 132,179
Short-term investments	269,190	214,024
Accounts receivable, net of allowance for doubtful accounts of $431 and $542, respectively	88,963	144,798
Prepaid expenses and other current assets	18,575	9,963
Total current assets	587,093	500,964
Property and equipment, net	47,195	47,469
Capitalized internal-use software, net	862	979
Goodwill	95,804	95,804
Intangible assets, net	43,386	47,500
Deferred income taxes, noncurrent	9,402	9,359
Other long-term assets	3,490	3,724
Total assets	787,232	705,799
Current liabilities:
Accounts payable	6,384	4,600
Accrued compensation and benefits	12,382	12,451
Accrued expenses and other current liabilities	9,294	11,059
Income tax payable	3,337	750
Deferred revenue	176,718	157,419
Total current liabilities	208,115	186,279
Deferred income taxes, noncurrent	9,870	10,622
Other long-term liabilities	4,139	3,649
Total liabilities	222,124	200,550
Commitments and contingencies (Note 12)
Stockholders’ equity:
Additional paid-in capital	395,386	361,691
Accumulated other comprehensive income	869	172
Retained earnings	168,852	143,385
Total stockholders’ equity	565,108	505,249
Total liabilities and stockholders’ equity	787,232	705,799
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1