Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 409,226	$ 217,606
Short-term investments	315,425	301,266
Accounts receivable, net of allowance for doubtful accounts of $404 and $659, respectively	97,153	182,816
Prepaid expenses and other current assets	11,551	10,177
Total current assets	833,355	711,865
Property and equipment, net	53,528	49,907
Goodwill	95,804	95,804
Intangible assets, net	35,288	39,283
Deferred income taxes, noncurrent	12,957	16,460
Other long-term assets	4,938	4,057
Total assets	1,035,870	917,376
Current liabilities:
Accounts payable	6,298	5,677
Accrued compensation and benefits	12,076	12,007
Accrued expenses and other current liabilities	12,291	12,310
Income tax payable	2,228	3,228
Deferred revenue	222,685	213,562
Total current liabilities	255,578	246,784
Deferred income taxes, noncurrent	7,561	12,974
Other long-term liabilities	6,128	4,964
Total liabilities	269,267	264,722
Commitments and contingencies (Note 10)
Stockholders’ equity:
Additional paid-in capital	478,580	439,658
Accumulated other comprehensive income	1,271	111
Retained earnings	286,751	212,884
Total stockholders’ equity	766,603	652,654
Total liabilities and stockholders’ equity	1,035,870	917,376
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1