Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
Current assets:
Cash and cash equivalents	$ 1,036,045	$ 1,134,355
Marketable securities	2,329,623	2,133,495
Trade and other receivables, net	354,209	528,208
Deferred costs	63,567	63,060
Prepaid expenses and other current assets	97,365	97,860
Total current assets	3,880,809	3,956,978
Property and equipment, net	611,293	546,609
Deferred costs, noncurrent	136,248	140,509
Acquisition-related intangible assets, net	29,146	34,234
Goodwill	159,398	159,376
Other assets	110,938	109,718
Total assets	4,927,832	4,947,424
Current liabilities:
Accounts payable	30,249	20,998
Accrued expenses and other current liabilities	112,977	121,879
Accrued compensation	163,383	148,247
Unearned revenue	1,319,794	1,426,241
Current portion of convertible senior notes, net	570,251	341,509
Total current liabilities	2,196,654	2,058,874
Convertible senior notes, net	939,242	1,149,845
Unearned revenue, noncurrent	95,270	110,906
Other liabilities	39,366	47,434
Total liabilities	3,270,532	3,367,059
Stockholders’ equity:
Common stock	215	211
Additional paid-in capital	3,489,690	3,354,423
Accumulated other comprehensive income (loss)	(30,766)	(46,413)
Accumulated deficit	(1,801,839)	(1,727,856)
Total stockholders’ equity	1,657,300	1,580,365
Total liabilities and stockholders’ equity	$ 4,927,832	$ 4,947,424

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

Name:	us-gaap_AccountsPayableCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.