Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2018	Jan. 31, 2018	[1]
Current assets:
Cash and cash equivalents	$ 467,643	$ 320,183
Short-term investments	584,283	441,779
Accounts receivable, net of allowance for doubtful accounts of $491 and $345, respectively	90,053	224,668	[2]
Unbilled accounts receivable	19,989	13,348	[2]
Prepaid expenses and other current assets	21,226	12,443
Total current assets	1,183,194	1,012,421
Property and equipment, net	53,614	52,284
Deferred costs, net	28,035	30,306
Goodwill	95,804	95,804
Intangible assets, net	26,188	31,490
Deferred income taxes, noncurrent	3,468	2,222
Other long-term assets	6,978	5,806
Total assets	1,397,281	1,230,333
Current liabilities:
Accounts payable	10,859	6,944
Accrued compensation and benefits	14,515	17,054
Accrued expenses and other current liabilities	12,091	13,152
Income tax payable	3,092	2,080
Deferred revenue	196,159	266,939
Total current liabilities	236,716	306,169
Deferred income taxes, noncurrent	14,143	10,949
Other long-term liabilities	8,117	6,977
Total liabilities	258,976	324,095
Commitments and contingencies (Note 12)
Stockholders’ equity:
Additional paid-in capital	591,497	515,272
Accumulated other comprehensive income	(1,239)	1,600
Retained earnings	548,046	389,365
Total stockholders’ equity	1,138,305	906,238
Total liabilities and stockholders’ equity	1,397,281	1,230,333
Class A common stock [Member]
Stockholders’ equity:
Common stock	$ 1	$ 1

[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.

[2] Unbilled accounts receivable was previously included in Accounts receivable before the adoption of Topic 606.