Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 30, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 365,660	$ 217,606
Short-term investments	298,257	301,266
Accounts receivable, net of allowance for doubtful accounts of $623 and $659, respectively	113,124	182,816
Prepaid expenses and other current assets	12,071	10,177
Total current assets	789,112	711,865
Property and equipment, net	51,954	49,907
Goodwill	95,804	95,804
Intangible assets, net	37,273	39,283
Deferred income taxes, noncurrent	16,844	16,460
Other long-term assets	4,676	4,057
Total assets	995,663	917,376
Current liabilities:
Accounts payable	5,162	5,677
Accrued compensation and benefits	12,378	12,007
Accrued expenses and other current liabilities	12,320	12,310
Income tax payable	1,140	3,228
Deferred revenue	238,046	213,562
Total current liabilities	269,046	246,784
Deferred income taxes, noncurrent	12,157	12,974
Other long-term liabilities	5,556	4,964
Total liabilities	286,759	264,722
Commitments and contingencies (Note 10)
Stockholders’ equity:
Additional paid-in capital	459,086	439,658
Accumulated other comprehensive income	910	111
Retained earnings	248,907	212,884
Total stockholders’ equity	708,904	652,654
Total liabilities and stockholders’ equity	995,663	917,376
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1