Salesforce (CRM) 10-Q 22 Nov 17 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information shares in Millions	9 Months Ended
	Oct. 31, 2017shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2017
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Trading Symbol	CRM
Entity Registrant Name	SALESFORCE COM INC
Entity Central Index Key	1,108,524
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	722.3

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 2,071,837	$ 1,606,549
Marketable securities	1,556,828	602,338
Accounts receivable, net	1,519,916	3,196,643
Deferred commissions	327,643	311,770
Prepaid expenses and other current assets	469,946	279,527
Total current assets	5,946,170	5,996,827
Property and equipment, net	1,864,891	1,787,534
Deferred commissions, noncurrent	253,004	227,849
Capitalized software, net	140,768	141,671
Strategic investments	670,406	566,953
Goodwill	7,294,141	7,263,846
Intangible assets acquired through business combinations, net	895,768	1,113,374
Other assets, net	424,888	486,869
Total assets	17,490,036	17,584,923
Current liabilities:
Accounts payable, accrued expenses and other liabilities	1,686,408	1,752,664
Deferred revenue	4,392,082	5,542,802
Convertible 0.25% senior notes, net	1,137,954	0
Total current liabilities	7,216,444	7,295,466
Convertible 0.25% senior notes, net	0	1,116,360
Term loan	498,084	497,221
Loan assumed on 50 Fremont	198,471	198,268
Revolving credit facility	0	196,542
Other noncurrent liabilities	736,870	780,939
Total liabilities	8,649,869	10,084,796
Temporary equity:
Convertible 0.25% senior notes (See Note 8)	10,797	0
Stockholders’ equity:
Common stock	722	708
Additional paid-in capital	9,230,081	8,040,170
Accumulated other comprehensive income (loss)	3,554	(75,841)
Accumulated deficit	(404,987)	(464,910)
Total stockholders’ equity	8,829,370	7,500,127
Total liabilities, temporary equity and stockholders’ equity	$ 17,490,036	$ 17,584,923

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical)	Oct. 31, 2017	Jan. 31, 2017
Notes Payable to Banks | 0.25% Convertible Senior Notes due April 1, 2018
Contractual interest rate	0.25%	0.25%

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenues:
Subscription and support		$ 2,486,131	$ 1,983,981	$ 7,055,538	$ 5,645,554
Professional services and other		193,710	160,794	573,471	452,442
Total revenues		2,679,841	2,144,775	7,629,009	6,097,996
Cost of revenues:
Subscription and support	[1],[2]	528,182	426,487	1,484,982	1,154,044
Professional services and other	[1],[2]	186,326	159,035	550,748	454,038
Total cost of revenues	[1],[2]	714,508	585,522	2,035,730	1,608,082
Gross profit		1,965,333	1,559,253	5,593,279	4,489,914
Operating expenses:
Research and development	[1],[2]	393,998	311,459	1,156,526	863,935
Marketing and sales	[1],[2]	1,184,733	997,993	3,464,986	2,828,784
General and administrative	[1],[2]	270,614	246,765	813,868	709,622
Total operating expenses	[1],[2]	1,849,345	1,556,217	5,435,380	4,402,341
Income from operations		115,988	3,036	157,899	87,573
Investment income		10,049	3,709	24,069	23,747
Interest expense		(21,557)	(21,946)	(65,382)	(64,665)
Other income (expense)	[1]	1,921	1,782	(2,695)	(11,500)
Gains from acquisitions of strategic investments		0	833	0	13,697
Income (loss) before benefit from (provision for) income taxes		106,401	(12,586)	113,891	48,852
Benefit from (provision for) income taxes		(55,007)	(24,723)	(53,968)	182,220
Net income (loss)		$ 51,394	$ (37,309)	$ 59,923	$ 231,072
Basic net income (loss) per share (in dollars per share)		$ 0.07	$ (0.05)	$ 0.08	$ 0.34
Diluted net income (loss) per share (in dollars per share)		$ 0.07	$ (0.05)	$ 0.08	$ 0.33
Shares used in computing basic net income (loss) per share (in shares)		717,445	690,468	711,884	683,075
Shares used in computing diluted net income (loss) per share (in shares)		738,106	690,468	730,212	696,257
[1]	Amounts include amortization of purchased intangibles from business combinations, as follows: Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016Cost of revenues$39,610 $36,703 $126,679 $84,462Marketing and sales30,067 28,064 91,274 66,601Other income (expense)367 579 1,118 1,927
[2]	Amounts include stock-based expense, as follows: Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016Cost of revenues$33,494 $26,783 $97,206 $76,912Research and development66,626 50,372 197,185 124,164Marketing and sales116,992 93,718 356,538 275,515General and administrative34,165 33,878 108,402 99,389

Consolidated Statements of Ope5

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Stock-based expenses	$ 251,277	$ 204,751	$ 759,331	$ 575,980
Cost of revenues
Amortization of purchased intangibles from business combinations	39,610	36,703	126,679	84,462
Stock-based expenses	33,494	26,783	97,206	76,912
Marketing and sales
Amortization of purchased intangibles from business combinations	30,067	28,064	91,274	66,601
Stock-based expenses	116,992	93,718	356,538	275,515
Research and development
Stock-based expenses	66,626	50,372	197,185	124,164
Other non-operating expense
Amortization of purchased intangibles from business combinations	367	579	1,118	1,927
General and administrative
Stock-based expenses	$ 34,165	$ 33,878	$ 108,402	$ 99,389

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 51,394	$ (37,309)	$ 59,923	$ 231,072
Other comprehensive income (loss), before tax and net of reclassification adjustments:
Foreign currency translation and other gains (losses)	(2,218)	(28,372)	28,190	(28,523)
Unrealized gains (losses) on marketable securities and strategic investments (See Note 2)	(11,763)	(16,019)	51,205	20,961
Other comprehensive income (loss), before tax	(13,981)	(44,391)	79,395	(7,562)
Tax effect	0	(7,337)	0	(5,464)
Other comprehensive income (loss), net of tax	(13,981)	(51,728)	79,395	(13,026)
Comprehensive income (loss)	$ 37,413	$ (89,037)	$ 139,318	$ 218,046

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Operating activities:
Net income (loss)	$ 51,394	$ (37,309)	$ 59,923	$ 231,072
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	187,546	169,346	564,911	451,479
Amortization of debt discount and issuance costs	7,795	7,281	23,265	21,334
Gains from acquisitions of strategic investments	0	(833)	0	(13,697)
Amortization of deferred commissions	117,677	93,230	331,687	270,527
Expenses related to employee stock plans	251,277	204,751	759,331	575,980
Changes in assets and liabilities, net of business combinations:
Accounts receivable, net	49,406	42,653	1,677,466	1,276,798
Deferred commissions	(171,562)	(92,803)	(372,714)	(226,965)
Prepaid expenses and other current assets and other assets	(15,669)	40,676	(166,784)	(25,723)
Accounts payable, accrued expenses and other liabilities	74,480	57,836	(39,720)	(275,058)
Deferred revenue	(426,552)	(330,516)	(1,150,720)	(829,695)
Net cash provided by operating activities	125,792	154,312	1,686,645	1,456,052
Investing activities:
Business combinations, net of cash acquired	0	(32,117)	(19,781)	(2,832,110)
Purchases of strategic investments	(54,585)	(28,660)	(113,088)	(65,834)
Sales of strategic investments	40,811	11,783	55,898	26,506
Purchases of marketable securities	(233,824)	(111,731)	(1,433,718)	(986,862)
Sales of marketable securities	193,783	93,391	437,248	1,927,049
Maturities of marketable securities	29,819	14,203	43,089	64,741
Capital expenditures	(111,278)	(140,653)	(396,268)	(319,984)
Net cash used in investing activities	(135,274)	(193,784)	(1,426,620)	(2,186,494)
Financing activities:
Proceeds from term loan, net	0	0	0	495,550
Proceeds from employee stock plans	141,970	92,846	484,786	315,865
Principal payments on capital lease obligations	(7,716)	(10,997)	(82,890)	(73,760)
Payments on revolving credit facility	0	0	(200,000)	0
Net cash provided by financing activities	134,254	81,849	201,896	737,655
Effect of exchange rate changes	(2,045)	(11,867)	3,367	(19,840)
Net increase (decrease) in cash and cash equivalents	122,727	30,510	465,288	(12,627)
Cash and cash equivalents, beginning of period	1,949,110	1,115,226	1,606,549	1,158,363
Cash and cash equivalents, end of period	2,071,837	1,145,736	2,071,837	1,145,736
Cash paid during the period for:
Interest	6,774	11,365	34,039	41,400
Income taxes, net of tax refunds	14,837	11,220	41,519	25,451
Non-cash investing and financing activities:
Fixed assets acquired under capital leases	0	180	2,471	765
Fair value of equity awards assumed	0	26,406	0	47,199
Fair value of common stock issued as consideration for business combinations	0	492,842	6,193	771,214
Non-cash equity liability (See Note 9)	$ 5,959	$ (1,473)	$ 18,920	$ 74,570

Summary of Business and Signifi

Summary of Business and Significant Accounting Policies	9 Months Ended
	Oct. 31, 2017
Accounting Policies [Abstract]
Summary of Business and Significant Accounting Policies	Summary of Business and Significant Accounting Policies Description of Business Salesforce.com, inc. (the "Company") is a leading provider of enterprise software, delivered through the cloud, with a focus on customer relationship management, or CRM. The Company introduced its first CRM solution in 2000, and has since expanded its service offerings into new areas and industries with new editions, features and platform capabilities. The Company's core mission is to empower its customers to connect with their customers in entirely new ways through cloud, mobile, social, Internet of Things (“IoT”) and artificial intelligence technologies. The Company's Customer Success Platform is a comprehensive portfolio of service offerings providing sales force automation, customer service and support, marketing automation, digital commerce, community management, analytics, application development, IoT integration, collaborative productivity tools and its professional cloud services. Fiscal Year The Company’s fiscal year ends on January 31. References to fiscal 2018 , for example, refer to the fiscal year ending January 31, 2018 . Basis of Presentation The accompanying consolidated balance sheet as of October 31, 2017 and the consolidated statements of operations, consolidated statements of comprehensive income (loss) and consolidated statements of cash flows for the three and nine months ended October 31, 2017 and 2016 , respectively, are unaudited. These financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of the Company’s management, the unaudited consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s balance sheet as of October 31, 2017 , and its results of operations, including its comprehensive income (loss) , and its cash flows for the three and nine months ended October 31, 2017 and 2016 . All adjustments are of a normal recurring nature. The results for the three and nine months ended October 31, 2017 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2018 . These unaudited interim consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the fiscal year ended January 31, 2017 , filed with the Securities and Exchange Commission (the “SEC”) on March 6, 2017 . Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions in the Company’s consolidated financial statements and notes thereto. Significant estimates and assumptions made by management include the determination of: • the best estimate of selling price of the deliverables included in multiple deliverable revenue arrangements; • the fair value of assets acquired and liabilities assumed for business combinations; • the recognition, measurement and valuation of current and deferred income taxes; • the fair value of certain stock awards issued; • the useful lives of intangible assets, property and equipment and building and structural components; and • the valuation of strategic investments and the determination of other-than-temporary impairments. Actual results could differ materially from those estimates. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the result of which forms the basis for making judgments about the carrying values of assets and liabilities. Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Segments The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker, who is the chief executive officer, in deciding how to allocate resources and assessing performance. Over the past few years, the Company has completed a number of acquisitions. These acquisitions have allowed the Company to expand its offerings, presence and reach in various market segments of the enterprise cloud computing market. While the Company has offerings in multiple enterprise cloud computing market segments, including as a result of the Company's acquisitions, the Company’s business operates in one operating segment because the majority of the Company's offerings operate on a single platform and are deployed in an identical way, and the Company’s chief operating decision maker evaluates the Company’s financial information and resources and assesses the performance of these resources on a consolidated basis. Since the Company operates in one operating segment, all required financial segment information can be found in the consolidated financial statements. Concentrations of Credit Risk and Significant Customers The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable. In addition, in connection with the Company's 0.25% Senior Notes (as defined in Note 8 "Debt"), which were issued in March 2013, the Company entered into convertible note hedge transactions with respect to its common stock, which are exposed to concentrations of credit risk. Collateral is not required for accounts receivable or the note hedge transactions. The Company maintains an allowance for its doubtful accounts receivable. This allowance is based upon historical loss patterns, the number of days that billings are past due and an evaluation of the potential risk of loss associated with delinquent accounts. Receivables are written-off and charged against its recorded allowance when the Company has exhausted collection efforts without success. No single customer accounted for more than five percent of accounts receivable at October 31, 2017 and January 31, 2017 . No single customer accounted for five percent or more of total revenue during the three and nine months ended October 31, 2017 and 2016 . Geographic Locations As of October 31, 2017 and January 31, 2017 , assets located outside the Americas were 13 percent and 12 percent of total assets, respectively. As of October 31, 2017 and January 31, 2017 , assets located in the United States were 86 percent and 86 percent of total assets, respectively. Revenues by geographical region are as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Americas $ 1,927,405 $ 1,598,344 $ 5,536,932 $ 4,506,774 Europe 493,732 337,497 1,367,718 1,012,671 Asia Pacific 258,704 208,934 724,359 578,551 $ 2,679,841 $ 2,144,775 $ 7,629,009 $ 6,097,996 Revenues by geography are determined based on the region of the Salesforce contracting entity, which may be different than the region of the customer. Americas revenue attributed to the United States was approximately 96 percent during the three and nine months ended October 31, 2017 and 2016 . No other country represented more than ten percent of total revenue during the three and nine months ended October 31, 2017 and 2016 . Revenue Recognition The Company derives its revenues from two sources: (1) subscription revenues, which are comprised of subscription fees from customers accessing the Company’s enterprise cloud computing services and from customers paying for additional support beyond the standard support that is included in the basic subscription fees; and (2) related professional services such as process mapping, project management, implementation services and other revenue. Other revenue consists primarily of training fees. The Company commences revenue recognition when all of the following conditions are satisfied: • there is persuasive evidence of an arrangement; • the service has been or is being provided to the customer; • the collection of the fees is reasonably assured; and • the amount of fees to be paid by the customer is fixed or determinable. The Company’s subscription service arrangements are non-cancelable and do not contain refund-type provisions. Subscription and Support Revenues Subscription and support revenues are recognized ratably over the contract terms beginning on the commencement date of each contract, which is the date the Company’s service is made available to customers. Amounts that have been invoiced are recorded in accounts receivable and in deferred revenue or revenue, depending on whether the revenue recognition criteria have been met. Professional Services and Other Revenues The Company’s professional services contracts are either on a time and materials, fixed fee or subscription basis. These revenues are recognized as the services are rendered for time and materials contracts, when the milestones are achieved and accepted by the customer or on a proportional performance basis for fixed price contracts and ratably over the contract term for subscription professional services contracts. The milestone method for revenue recognition is used when there is substantive uncertainty at the date the contract is entered into whether the milestone will be achieved. Training revenues are recognized as the services are performed. Multiple Deliverable Arrangements The Company enters into arrangements with multiple deliverables that generally include multiple subscriptions, premium support and professional services. If the deliverables have standalone value at contract inception, the Company accounts for each deliverable separately. Subscription services have standalone value as such services are often sold separately. In determining whether professional services have standalone value, the Company considers the following factors for each professional services agreement: availability of the services from other vendors, the nature of the professional services, the timing of when the professional services contract was signed in comparison to the subscription service start date and the contractual dependence of the subscription service on the customer’s satisfaction with the professional services work. To date, the Company has concluded that all of the professional services included in multiple deliverable arrangements executed have standalone value. Multiple deliverables included in an arrangement are separated into different units of accounting and the arrangement consideration is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on its vendor-specific objective evidence of selling price (“VSOE”), if available, or its best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its service offerings compared to other parties and the availability of relevant third-party pricing information. The amount of revenue allocated to delivered items is limited by contingent revenue, if any. For certain professional services, the Company has established VSOE as a consistent number of standalone sales of these deliverables have been priced within a reasonably narrow range. The Company has not established VSOE for its subscription services due to lack of pricing consistency, the introduction of new services and other factors. Accordingly, the Company uses its BESP to determine the relative selling price for its subscription services. The Company determines BESP by considering its overall pricing objectives and market conditions. Significant pricing practices taken into consideration include the Company’s discounting practices, the size and volume of the Company’s transactions, the customer demographic, the geographic area where services are sold, price lists, its go-to-market strategy, historical standalone sales and contract prices. The determination of BESP is made through consultation with and approval by the Company’s management, taking into consideration the go-to-market strategy. As the Company’s go-to-market strategies evolve, the Company may modify its pricing practices in the future, which could result in changes in relative selling prices, including both VSOE and BESP. Deferred Revenue The deferred revenue balance does not represent the total contract value of annual or multi-year, non-cancelable subscription agreements. Deferred revenue primarily consists of billings or payments received in advance of revenue recognition from subscription services described above and is recognized as the revenue recognition criteria are met. The Company generally invoices customers in annual installments. The deferred revenue balance is influenced by several factors, including seasonality, the compounding effects of renewals, invoice duration, invoice timing, dollar size and new business linearity within the quarter. Deferred Commissions Deferred commissions are the incremental costs that are directly associated with non-cancelable subscription contracts with customers and consist of sales commissions paid to the Company’s direct sales force. The commissions are deferred and amortized over the non-cancelable terms of the related customer contracts, which are typically 12 to 36 months . The commission payments are paid in full the month after the customer’s service commences and are a direct and incremental cost of the revenue arrangements. The deferred commission amounts are recoverable through the future revenue streams under the non-cancelable customer contracts. The Company believes this is the preferable method of accounting as the commission charges are so closely related to the revenue from the non-cancelable customer contracts that they should be recorded as an asset and charged to expense over the same period that the subscription revenue is recognized. Amortization of deferred commissions is included in marketing and sales expense in the accompanying consolidated statements of operations. During the nine months ended October 31, 2017 , the Company deferred $372.7 million of commission expenditures and amortized $331.7 million to sales expense. During the same period a year ago, the Company deferred $227.0 million of commission expenditures and amortized $270.5 million to sales expense. Deferred commissions on the Company's consolidated balance sheets totaled $580.6 million at October 31, 2017 and $539.6 million at January 31, 2017 . Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents are stated at fair value. Marketable Securities The Company considers all of its marketable debt securities as available for use in current operations, including those with maturity dates beyond one year, and therefore classifies these securities within current assets on the consolidated balance sheets. Securities are classified as available for sale and are carried at fair value, with the change in unrealized gains and losses, net of tax, reported as a separate component on the consolidated statements of comprehensive income until realized. Fair value is determined based on quoted market rates when observable or utilizing data points that are observable, such as quoted prices, interest rates and yield curves. Declines in fair value judged to be other-than-temporary on securities available for sale are included as a reduction to investment income. In order to determine whether a decline in value is other-than-temporary, the Company evaluates, among other factors: the duration and extent to which the fair value has been less than the carrying value and its intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. For the purposes of computing realized and unrealized gains and losses, the cost of securities sold is based on the specific-identification method. Interest on securities classified as available for sale is also included as a component of investment income. Strategic Investments The Company holds certain marketable equity and non-marketable debt and equity securities within its strategic investments portfolio. Marketable equity securities are measured using quoted prices in their respective active markets, non-marketable debt securities are recorded at their estimated fair value and the non-marketable equity securities are recorded at cost. Marketable equity securities and non-marketable debt securities, which consist of noncontrolling debt investments in privately held companies, are recorded at fair value with changes in fair value recorded through accumulated other comprehensive income. Equity investments without readily determinable fair values for which the Company does not have the ability to exercise significant influence are accounted for using the cost method of accounting. Under the cost method of accounting, the non-marketable securities are carried at cost and are adjusted only for other-than-temporary impairments, certain distributions and additional investments. These investments are valued using significant unobservable inputs or data in an inactive market and the valuation requires the Company's judgment due to the absence of market prices and inherent lack of liquidity. The estimated fair value is based on quantitative and qualitative factors including, but not limited to, subsequent financing activities by the investee and projected discounted cash flows. Fair value is not estimated for non-marketable equity securities if there are no identified events or changes in circumstances that may have an effect on the fair value of the investment. The carrying value of the Company’s strategic investments is impacted by various events such as entering into new investments, dispositions due to acquisitions, fair market value adjustments or initial public offerings. The cash inflows from exits and cash outflows for new investments are disclosed as strategic investments within the investing activities section of the statement of cash flows and any gains or losses are recorded within the operating activities of the statements of cash flows for each of the respective fiscal quarter periods. Derivative Financial Instruments The Company enters into foreign currency derivative contracts with financial institutions to reduce foreign exchange risk. The Company uses forward currency derivative contracts to minimize the Company’s exposure to balances primarily denominated in the Euro, British Pound Sterling, Japanese Yen, Canadian Dollar and Australian Dollar. The Company’s foreign currency derivative contracts, which are not designated as hedging instruments, are used to reduce the exchange rate risk associated primarily with intercompany receivables and payables. The Company’s derivative financial instruments program is not designated for trading or speculative purposes. As of October 31, 2017 and January 31, 2017 , the foreign currency derivative contracts that were not settled were recorded at fair value on the consolidated balance sheets. Foreign currency derivative contracts are marked-to-market at the end of each reporting period with gains and losses recognized as other expense to offset the gains or losses resulting from the settlement or remeasurement of the underlying foreign currency denominated receivables and payables. While the contract or notional amount is often used to express the volume of foreign currency derivative contracts, the amounts potentially subject to credit risk are generally limited to the amounts, if any, by which the counterparties’ obligations under the agreements exceed the obligations of the Company to the counterparties. Fair Value Measurement The Company measures its cash and cash equivalents, marketable securities and foreign currency derivative contracts at fair value. The additional disclosures regarding the Company’s fair value measurements are included in Note 4 “Fair Value Measurement.” Property and Equipment Property and equipment are stated at cost. Depreciation is calculated on a straight-line basis over the estimated useful lives of those assets as follows: Computers, equipment and software 3 to 9 years Furniture and fixtures 5 years Leasehold improvements Shorter of the estimated lease term or 10 years Building and structural components Average weighted useful life of 32 years Building - leased facility 27 years Building improvements 10 years When assets are retired or otherwise disposed of, the cost and accumulated depreciation and amortization are removed from their respective accounts and any loss on such retirement is reflected in operating expenses. Capitalized Software Costs The Company capitalizes costs related to its enterprise cloud computing services and certain projects for internal use incurred during the application development stage. Costs related to preliminary project activities and post implementation activities are expensed as incurred. Internal-use software is amortized on a straight-line basis over its estimated useful life, which is generally three to five years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets. Intangible Assets acquired through Business Combinations Intangible assets are amortized over their estimated useful lives. Each period, the Company evaluates the estimated remaining useful life of its intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization. Impairment Assessment The Company evaluates intangible assets and long-lived assets for possible impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. This includes but is not limited to significant adverse changes in business climate, market conditions, or other events that indicate an asset's carrying amount may not be recoverable. Recoverability of these assets is measured by comparing the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. If the undiscounted cash flows used in the test for recoverability are less than the carrying amount of these assets, the carrying amount of such assets is reduced to fair value. The Company evaluates and tests the recoverability of its goodwill for impairment at least annually during its fourth quarter of each fiscal year or more often if and when circumstances indicate that goodwill may not be recoverable. There was no impairment of intangible assets, long-lived assets or goodwill during the three and nine months ended October 31, 2017 and 2016 . Business Combinations The Company uses its best estimates and assumptions to accurately assign fair value to the tangible and intangible assets acquired and liabilities assumed at the acquisition date. The Company’s estimates are inherently uncertain and subject to refinement. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed, with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially established in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the Company’s consolidated statements of operations. In the event the Company acquires an entity with which the Company has a preexisting relationship, the Company will recognize a gain or loss to settle that relationship as of the acquisition date, which is recorded in other income (expense) within the statements of operations. In the event that the Company acquires an entity in which the Company previously held a strategic investment, the difference between the fair value of the shares as of the date of the acquisition and the carrying value of the strategic investment is recorded as a gain or loss and disclosed separately within the statements of operations. Leases and Asset Retirement Obligations The Company categorizes leases at their inception as either operating or capital leases. In certain lease agreements, the Company may receive rent holidays and other incentives. The Company recognizes lease costs on a straight-line basis once control of the space is achieved, without regard to deferred payment terms such as rent holidays that defer the commencement date of required payments. Additionally, incentives received are treated as a reduction of costs over the term of the agreement. The Company establishes assets and liabilities for the present value of estimated future costs to retire long-lived assets at the termination or expiration of a lease. Such assets are depreciated over the lease period to operating expense. In the event the Company is the deemed owner for accounting purposes during construction, the Company records assets and liabilities for the estimated construction costs incurred under build-to-suit lease arrangements to the extent it is involved in the construction of structural improvements or takes construction risk prior to commencement of a lease. The Company additionally has entered into subleases for unoccupied leased office space. To the extent there are losses associated with the sublease, they are recognized in the period the sublease is executed. Gains are recognized over the sublease life. Any sublease payments received in excess of the straight-line rent payments for the sublease are recorded in other income (expense). Accounting for Stock-Based Expense The Company recognizes stock-based expenses related to stock options and restricted stock awards on a straight-line basis, net of forfeitures, over the requisite service period of the awards, which is generally the vesting term of four years . The Company recognizes stock-based expenses related to shares issued pursuant to its Amended and Restated 2004 Employee Stock Purchase Plan (“ESPP” or “2004 Employee Stock Purchase Plan”) on a straight-line basis over the offering period, which is 12 months . Stock-based expenses related to performance share grants are measured based on grant date fair value and expensed on a straight-line basis over the service period of the awards, which is generally the vesting term of three years. The Company, at times, grants unvested restricted shares to employee stockholders of certain acquired companies in lieu of cash consideration. These awards are generally subject to continued post-acquisition employment. Therefore, the Company accounts for them as post-acquisition stock-based expense. The Company recognizes stock-based expense equal to the grant date fair value of the restricted stock awards on a straight-line basis over the requisite service period of the awards, which is generally four years . Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on temporary differences between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax laws is recognized in the consolidated statements of operations in the period that includes the enactment date. The Company’s tax positions are subject to income tax audits by multiple tax jurisdictions throughout the world. The Company recognizes the tax benefit of an uncertain tax position only if it is more likely than not that the position is sustainable upon examination by the taxing authority, solely based on its technical merits. The tax benefit recognized is measured as the largest amount of benefit which is greater than 50 percent likely to be realized upon settlement with the taxing authority. The Company recognizes interest accrued and penalties related to unrecognized tax benefits in the income tax provision. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts that are more likely than not expected to be realized based on the weighting of positive and negative evidence. Future realization of deferred tax assets ultimately depends on the existence of sufficient taxable income of the appropriate character (for example, ordinary income or capital gain) within the carryback or carryforward periods available under the applicable tax law. The Company regularly reviews the deferred tax assets for recoverability based on historical taxable income, projected future taxable income, the expected timing of the reversals of existing temporary differences and tax planning strategies. The Company’s judgments regarding future profitability may change due to many factors, including future market conditions and the ability to successfully execute its business plans and/or tax planning strategies. Should there be a change in the ability to recover deferred tax assets, the tax provision would increase or decrease in the period in which the assessment is changed. Foreign Currency Translation The functional currency of the Company’s major foreign subsidiaries is generally the local currency. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars are recorded as a separate component on the consolidated statements of comprehensive income. Foreign currency transaction gains and losses are included in Other income (expense) in the consolidated statements of operations for the period. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates. Warranties and Indemnification The Company’s enterprise cloud computing services are typically warranted to perform in a manner consistent with general industry standards that are reasonably applicable and materially in accordance with the Company’s online help documentation under normal use and circumstances. The Company’s arrangements generally include certain provisions for indemnifying customers against liabilities if its products or services infringe a third party’s intellectual property rights. To date, the Company has not incurred any material costs as a result of such obligations and has not accrued any material liabilities related to such obligations in the accompanying consolidated financial statements. The Company has also agreed to indemnify its directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by the Company, arising out of that person’s services as the Company’s director or officer or that person’s services provided to any other company or enterprise at the Company’s request. The Company maintains director and officer insurance coverage that would generally enable the Company to recover a portion of any future amounts paid. The Company may also be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions. New Accounting Pronouncements Adopted in Fiscal 2018 In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2017-01, "Business Combinations (Topic 805) Clarifying the Definiti

Investments

Investments	9 Months Ended
	Oct. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Investments	Investments Marketable Securities At October 31, 2017 , marketable securities consisted of the following (in thousands): Investments classified as Marketable Securities Amortized Cost Unrealized Gains Unrealized Losses Fair Value Corporate notes and obligations $ 939,959 $ 2,246 $ (2,435 ) $ 939,770 U.S. treasury securities 137,172 29 (491 ) 136,710 Mortgage backed obligations 98,226 22 (532 ) 97,716 Asset backed securities 202,180 96 (219 ) 202,057 Municipal securities 56,387 81 (201 ) 56,267 Foreign government obligations 68,845 2 (524 ) 68,323 U.S. agency obligations 10,506 1 (9 ) 10,498 Covered bonds 45,485 63 (61 ) 45,487 Total marketable securities $ 1,558,760 $ 2,540 $ (4,472 ) $ 1,556,828 At January 31, 2017 , marketable securities consisted of the following (in thousands): Investments classified as Marketable Securities Amortized Cost Unrealized Gains Unrealized Losses Fair Value Corporate notes and obligations $ 321,284 $ 887 $ (1,531 ) $ 320,640 U.S. treasury securities 62,429 68 (674 ) 61,823 Mortgage backed obligations 74,882 39 (669 ) 74,252 Asset backed securities 101,913 74 (197 ) 101,790 Municipal securities 33,523 35 (183 ) 33,375 Foreign government obligations 10,491 3 (36 ) 10,458 Total marketable securities $ 604,522 $ 1,106 $ (3,290 ) $ 602,338 The contractual maturities of the investments classified as marketable securities are as follows (in thousands): As of October 31, January 31, Due within 1 year $ 226,929 $ 104,631 Due in 1 year through 5 years 1,314,352 494,127 Due in 5 years through 10 years 15,547 3,580 $ 1,556,828 $ 602,338 As of October 31, 2017 , the following marketable securities were in an unrealized loss position (in thousands): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Corporate notes and obligations $ 424,101 $ (2,052 ) $ 28,653 $ (383 ) $ 452,754 $ (2,435 ) U.S. treasury securities 114,724 (491 ) 0 0 114,724 (491 ) Mortgage backed obligations 68,841 (315 ) 16,564 (217 ) 85,405 (532 ) Asset backed securities 126,186 (210 ) 3,461 (9 ) 129,647 (219 ) Municipal securities 30,671 (148 ) 2,788 (53 ) 33,459 (201 ) Foreign government obligations 62,697 (520 ) 1,027 (4 ) 63,724 (524 ) U.S. agency obligations 6,746 (9 ) 0 0 6,746 (9 ) Covered bonds 5,861 (61 ) 0 0 5,861 (61 ) $ 839,827 $ (3,806 ) $ 52,493 $ (666 ) $ 892,320 $ (4,472 ) The unrealized losses for each of the fixed rate marketable securities were less than $0.2 million . The Company does not believe any of the unrealized losses represent an other-than-temporary impairment based on its evaluation of available evidence as of October 31, 2017 , such as the Company's intent to hold and whether it is more likely than not that the Company will be required to sell the investment before recovery of the investment's amortized basis. The Company expects to receive the full principal and interest on all of these marketable securities. Investment Income Investment income consists of interest income, realized gains and realized losses on the Company’s cash, cash equivalents and marketable securities. The components of investment income are presented below (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Interest income $ 10,038 $ 3,642 $ 24,433 $ 17,961 Realized gains 258 210 770 7,771 Realized losses (247 ) (143 ) (1,134 ) (1,985 ) Total investment income $ 10,049 $ 3,709 $ 24,069 $ 23,747 Reclassification adjustments out of accumulated other comprehensive income into investment income were immaterial for the three and nine months ended October 31, 2017 and 2016 . Strategic Investments As of October 31, 2017 , the Company had three investments in marketable equity securities with a fair value of $100.3 million , which included an unrealized gain of $62.0 million . As of January 31, 2017 , the Company had six investments in marketable equity securities with a fair value of $41.0 million , which included an unrealized gain of $24.5 million . The change in the fair value of the investments in publicly held companies is recorded in the consolidated balance sheets within strategic investments and accumulated other comprehensive income. As of October 31, 2017 and January 31, 2017 , the carrying value of the Company’s non-marketable debt and equity securities was $570.1 million and $526.0 million , respectively. The estimated fair value of the non-marketable debt and equity securities was approximately $803.9 million and $758.3 million as of October 31, 2017 and January 31, 2017 , respectively. The Company sold a portion of its publicly-held investments in the three months ended October 31, 2017, which resulted in a reclassification of previously unrealized gains from the statement of comprehensive income (loss) to the statement of operations in the amount of $15.5 million . This amount was not material in prior periods.

Derivatives

Derivatives	9 Months Ended
	Oct. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Details on outstanding foreign currency derivative contracts are presented below (in thousands): As of October 31, 2017 January 31, 2017 Notional amount of foreign currency derivative contracts $ 1,275,276 $ 1,280,953 Fair value of foreign currency derivative contracts $ 853 $ 10,205 The fair value of the Company’s outstanding derivative instruments not designated as hedging instruments are summarized below (in thousands): As of Balance Sheet Location October 31, 2017 January 31, 2017 Derivative Assets Foreign currency derivative contracts Prepaid expenses and other current assets $ 4,225 $ 13,238 Derivative Liabilities Foreign currency derivative contracts Accounts payable, accrued expenses and other liabilities $ 3,372 $ 3,033 Gains/losses on derivative instruments not designated as hedging instruments recorded in Other income (expense) in the consolidated statements of operations during the three and nine months ended October 31, 2017 and 2016 , respectively, are summarized below (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Foreign currency derivative contracts $ (1,606 ) $ (39,624 ) $ 11,500 $ (86,528 )

Fair Value Measurement

Fair Value Measurement	9 Months Ended
	Oct. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement The Company uses a three-tier fair value hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value: Level 1. Quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2. Significant other inputs that are directly or indirectly observable in the marketplace. Level 3. Significant unobservable inputs which are supported by little or no market activity. All of the Company’s cash equivalents, marketable securities and foreign currency derivative contracts are classified within Level 1 or Level 2 because the Company’s cash equivalents, marketable securities and foreign currency derivative contracts are valued using quoted market prices or alternative pricing sources and models utilizing observable market inputs. The following table presents information about the Company’s assets and liabilities that are measured at fair value as of October 31, 2017 and indicates the fair value hierarchy of the valuation (in thousands): Description Quoted Prices in Significant Other Significant Balances as of October 31, 2017 Cash equivalents (1): Time deposits $ 0 $ 394,123 $ 0 $ 394,123 Money market mutual funds 805,554 0 0 805,554 Marketable securities: Corporate notes and obligations 0 939,770 0 939,770 U.S. treasury securities 0 136,710 0 136,710 Mortgage backed obligations 0 97,716 0 97,716 Asset backed securities 0 202,057 0 202,057 Municipal securities 0 56,267 0 56,267 Foreign government obligations 0 68,323 0 68,323 U.S. agency obligations 0 10,498 0 10,498 Covered bonds 0 45,487 0 45,487 Foreign currency derivative contracts (2) 0 4,225 0 4,225 Total assets $ 805,554 $ 1,955,176 $ 0 $ 2,760,730 Liabilities: Foreign currency derivative contracts (3) 0 3,372 0 3,372 Total liabilities $ 0 $ 3,372 $ 0 $ 3,372 ___________ (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheet as of October 31, 2017 , in addition to $872.2 million of cash. (2) Included in “prepaid expenses and other current assets” in the accompanying consolidated balance sheet as of October 31, 2017 . (3) Included in “accounts payable, accrued expenses and other liabilities” in the accompanying consolidated balance sheet as of October 31, 2017 . The following table presents information about the Company’s assets and liabilities that are measured at fair value as of January 31, 2017 and indicates the fair value hierarchy of the valuation (in thousands): Description Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of January 31, 2017 Cash equivalents (1): Time deposits $ 0 $ 25,100 $ 0 $ 25,100 Money market mutual funds 956,479 0 0 956,479 Marketable securities: Corporate notes and obligations 0 320,640 0 320,640 U.S. treasury securities 0 61,823 0 61,823 Mortgage backed obligations 0 74,252 0 74,252 Asset backed securities 0 101,790 0 101,790 Municipal securities 0 33,375 0 33,375 Foreign government obligations 0 10,458 0 10,458 Foreign currency derivative contracts (2) 0 13,238 0 13,238 Total assets $ 956,479 $ 640,676 $ 0 $ 1,597,155 Liabilities: Foreign currency derivative contracts (3) 0 3,033 0 3,033 Total liabilities $ 0 $ 3,033 $ 0 $ 3,033 ______________ (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheet as of January 31, 2017 , in addition to $625.0 million of cash. (2) Included in “prepaid expenses and other current assets” in the accompanying consolidated balance sheet as of January 31, 2017 . (3) Included in “accounts payable, accrued expenses and other liabilities” in the accompanying consolidated balance sheet as of January 31, 2017 .

Property and Equipment

Property and Equipment	9 Months Ended
	Oct. 31, 2017
Property, Plant and Equipment [Abstract]
Property and Equipment	Property and Equipment Property and Equipment Property and equipment, net consisted of the following (in thousands): As of October 31, 2017 January 31, 2017 Land $ 183,888 $ 183,888 Buildings and building improvements 626,168 621,377 Computers, equipment and software 1,600,783 1,440,986 Furniture and fixtures 132,374 112,564 Leasehold improvements 776,396 627,069 3,319,609 2,985,884 Less accumulated depreciation and amortization (1,454,718 ) (1,198,350 ) $ 1,864,891 $ 1,787,534 Depreciation and amortization expense totaled $94.2 million and $83.5 million during the three months ended October 31, 2017 and 2016 , respectively, and $277.2 million and $239.2 million during the nine months ended October 31, 2017 and 2016 , respectively. Computers, equipment and software at October 31, 2017 and January 31, 2017 included a total of $729.5 million and $729.0 million acquired under capital lease agreements, respectively. Accumulated amortization relating to computers, equipment and software acquired under capital leases totaled $450.5 million and $386.9 million , respectively, at October 31, 2017 and January 31, 2017 . Amortization of assets acquired under capital leases is included in depreciation and amortization expense. Building - 350 Mission In December 2013, the Company entered into a lease agreement for approximately 445,000 rentable square feet of office space at 350 Mission Street (“350 Mission”) in San Francisco, California, which is the total office space available in the building. As a result of the Company’s involvement during the construction period, the Company is considered for accounting purposes to be the owner of 350 Mission. As a result, the Company has capitalized the construction costs as Building with a corresponding current and noncurrent financing obligation liability and has accounted for the underlying land implicitly as an operating lease. As of October 31, 2017 , the Company had capitalized $178.8 million of construction costs, based on the construction costs incurred to date by the landlord, and recorded a corresponding current and noncurrent financing obligation liability of $19.9 million and $198.9 million , respectively. As of January 31, 2017 , the Company had capitalized $178.8 million of construction costs, based on the construction costs incurred to date by the landlord, and recorded a corresponding current and noncurrent financing obligation liability of $19.6 million and $200.7 million , respectively. The total expected financing obligation in the form of minimum lease payments inclusive of the amounts currently recorded is $306.3 million , including interest (see Note 13 “Commitments” for future commitment details). The obligation will be settled through monthly lease payments to the landlord, which commenced in October 2015. To the extent that operating expenses for 350 Mission are material, the Company, as the deemed accounting owner, will record the operating expenses.

Business Combinations

Business Combinations	9 Months Ended
	Oct. 31, 2017
Business Combinations [Abstract]
Business Combinations	Business Combinations In February 2017, the Company acquired Sequence, Inc. for an aggregate of $26.0 million in cash and equity, net of cash acquired, and has included the financial results of the company in its consolidated financial statements from the date of acquisition. The costs associated with this acquisition were not material. The Company accounted for this acquisition as a business combination. In allocating the purchase consideration based on estimated fair values, the Company recorded $2.7 million of intangible assets and $23.0 million of goodwill. The goodwill balance associated with this business combination is deductible for U.S. income tax purposes. The Company expects to finalize the valuation as soon as practicable, but not later than one year from the acquisition date.

Intangible Assets Acquired Thro

Intangible Assets Acquired Through Business Combinations and Goodwill	9 Months Ended
	Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Acquired Through Business Combinations and Goodwill	Intangible Assets Acquired Through Business Combinations and Goodwill Intangible assets acquired through business combinations Intangible assets acquired through business combinations are as follows (in thousands): Intangible Assets, Gross Accumulated Amortization Intangible Assets, Net Weighted Jan 31, 2017 Additions Oct. 31, 2017 Jan 31, 2017 Expense Oct. 31, 2017 Jan 31, 2017 Oct. 31, 2017 Acquired developed technology $ 1,092,161 $ 0 $ 1,092,161 $ (577,929 ) $ (125,886 ) $ (703,815 ) $ 514,232 $ 388,346 3.0 Customer relationships 843,614 1,690 845,304 (254,035 ) (89,769 ) (343,804 ) 589,579 501,500 4.7 Trade names and trademarks 45,950 0 45,950 (41,349 ) (1,530 ) (42,879 ) 4,601 3,071 1.6 Territory rights and other 15,786 0 15,786 (12,256 ) (996 ) (13,252 ) 3,530 2,534 8.3 50 Fremont lease intangibles 7,713 0 7,713 (6,281 ) (1,115 ) (7,396 ) 1,432 317 0.3 Total $ 2,005,224 $ 1,690 $ 2,006,914 $ (891,850 ) $ (219,296 ) $ (1,111,146 ) $ 1,113,374 $ 895,768 3.9 Amortization of intangible assets and unfavorable lease liabilities, which are not reflected in the table above, resulting from business combinations for the three months ended October 31, 2017 and 2016 was $70.0 million and $65.3 million , respectively, and for the nine months ended October 31, 2017 and 2016 was $219.1 million and $153.0 million , respectively. The expected future amortization expense for intangible assets as of October 31, 2017 is as follows (in thousands): Fiscal Period: Remaining three months of Fiscal 2018 $ 69,053 Fiscal 2019 266,233 Fiscal 2020 225,039 Fiscal 2021 169,481 Fiscal 2022 111,353 Thereafter 54,609 Total amortization expense $ 895,768 Goodwill Goodwill represents the excess of the purchase price in a business combination over the fair value of net assets acquired. Goodwill amounts are not amortized, but rather tested for impairment at least annually during the fourth quarter. The changes in the carrying amounts of goodwill, which is generally not deductible for tax purposes, were as follows (in thousands): Balance as of January 31, 2017 $ 7,263,846 Sequence, Inc. acquisition 22,982 Adjustments of acquisition date fair values, including the effect of foreign currency translation 7,313 Balance as of October 31, 2017 $ 7,294,141

Debt

Debt	9 Months Ended
	Oct. 31, 2017
Debt Disclosure [Abstract]
Debt	Debt Convertible Senior Notes Par Value Outstanding Equity Component Recorded at Issuance Liability Component of Par Value as of (in thousands) October 31, January 31, 0.25% Convertible Senior Notes due April 1, 2018 $ 1,149,979 $ 122,421 (1) $ 1,137,954 $ 1,116,360 ___________ (1) This amount represents the equity component recorded at the initial issuance of the 0.25% convertible senior notes. As of October 31, 2017 , $10.8 million was reclassified to temporary equity on the accompanying consolidated balance sheet as these notes are convertible for the three months ending October 31, 2017 based on the conversion criteria below. In March 2013, the Company issued at par value $1.15 billion of 0.25% convertible senior notes (the “ 0.25% Senior Notes”, or “Notes”) due April 1, 2018 , unless earlier purchased by the Company or converted and are therefore classified as current on the consolidated balance sheet as of October 31, 2017 as they are due within one year. Interest is payable semi-annually, in arrears on April 1 and October 1 of each year. The 0.25% Senior Notes are governed by an indenture between the Company, as issuer, and U.S. Bank National Association, as trustee. The 0.25% Senior Notes are unsecured and do not contain any financial covenants or any restrictions on the payment of dividends, the incurrence of senior debt or other indebtedness, or the issuance or repurchase of securities by the Company. If converted, holders of the 0.25% Senior Notes will receive cash equal to the principal amount, and at the Company’s election, cash, shares of the Company’s common stock, or a combination of cash and shares, for any amounts in excess of the principal amounts. Certain terms of the conversion features of the 0.25% Senior Notes are as follows: Conversion Rate per $1,000 Par Value Initial Conversion Price per Share Convertible Date 0.25% Senior Notes 15.0512 $ 66.44 January 1, 2018 Throughout the term of the 0.25% Senior Notes, the conversion rate may be adjusted upon the occurrence of certain events, including any cash dividends. Holders of the 0.25% Senior Notes will not receive any cash payment representing accrued and unpaid interest upon conversion of a Note. Accrued but unpaid interest will be deemed to be paid in full upon conversion rather than canceled, extinguished or forfeited. Holders may convert the 0.25% Senior Notes under the following circumstances: • during any fiscal quarter, if, for at least 20 trading days during the 30 consecutive trading day period ending on the last trading day of the immediately preceding fiscal quarter, the last reported sales price of the Company’s common stock for such trading day is greater than or equal to 130% of the applicable conversion price on such trading day; • in certain situations, when the trading price of the 0.25% Senior Notes is less than 98% of the product of the sale price of the Company’s common stock and the conversion rate; • upon the occurrence of specified corporate transactions described under the 0.25% Senior Notes indenture, such as a consolidation, merger or binding share exchange; or • at any time on or after the convertible date noted above (as described in the indenture). Holders of the 0.25% Senior Notes have the right to require the Company to purchase with cash all or a portion of the Notes upon the occurrence of a fundamental change, such as a change of control, at a purchase price equal to 100% of the principal amount of the 0.25% Senior Notes plus accrued and unpaid interest. Following certain corporate transactions that constitute a change of control, the Company will increase the conversion rate for a holder who elects to convert the 0.25% Senior Notes in connection with such change of control. In accounting for the issuances of the 0.25% Senior Notes, the Company separated the 0.25% Senior Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was determined by deducting the fair value of the liability component from the par value of the 0.25% Senior Notes as a whole. The excess of the principal amount of the liability component over its carrying amount (“debt discount”) is amortized to interest expense over the term of the 0.25% Senior Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. In any period when holders of the 0.25% Senior Notes are eligible to exercise their conversion option, the equity component related to convertible debt instruments is required to be reclassified from permanent equity to temporary equity. Therefore, if in any future period the holders of the 0.25% Senior Notes are able to exercise their conversion rights, then the difference between (1) the amount of cash deliverable upon conversion (i.e., par value of debt) and (2) the carrying value of the debt component will be reclassified from permanent equity to temporary equity, and will continue to be reported as temporary equity for any period in which the debt remains currently convertible. In accounting for the transaction costs related to the 0.25% Senior Notes issuance, the Company allocated the total amount incurred to the liability and equity components based on their relative values. Transaction costs attributable to the liability component are being amortized to expense over the terms of the 0.25% Senior Notes, and transaction costs attributable to the equity component were netted with the equity component in stockholders’ equity. The 0.25% Senior Notes consisted of the following (in thousands): As of October 31, January 31, Liability component: Principal (1) $ 1,149,979 $ 1,150,000 Less: debt discount, net (2) (10,797 ) (29,954 ) Less: debt issuance cost (1,228 ) (3,686 ) Net carrying amount $ 1,137,954 $ 1,116,360 (1) The effective interest rate of the 0.25% Senior Notes is 2.53% . The interest rate is based on the interest rates of similar liabilities at the time of issuance that did not have an associated convertible feature. (2) Included in the consolidated balance sheets within Convertible 0.25% Senior Notes (which is classified as a current liability as of October 31, 2017 and a noncurrent liability as of January 31, 2017) and is amortized over the life of the 0.25% Senior Notes using the effective interest rate method. The total estimated fair value of the Company's 0.25% Senior Notes at October 31, 2017 was $1.8 billion . The fair value was determined based on the closing trading price per $100 of the 0.25% Senior Notes as of the last day of trading for the third quarter of fiscal 2018 . Based on the closing price of the Company’s common stock of $102.34 on October 31, 2017 , the if-converted value of the 0.25% Senior Notes exceeded their principal amount by approximately $621.4 million . During the three months ended October 31, 2017 , an immaterial portion of the 0.25% Senior Notes outstanding was converted by noteholders. The Company recorded an immaterial loss during the three months ended October 31, 2017 related to the extinguishment of the 0.25% Senior Notes converted by noteholders, which represents the difference between the fair market value allocated to the liability component on settlement date and the net carrying amount of the liability component and unamortized debt issuance costs on settlement date. As of October 31, 2017 the remaining principal balance of the 0.25% Senior Notes outstanding is approximately $1.15 billion . The remaining principal balance of the 0.25% Senior Notes matures on April 1, 2018 unless earlier converted by noteholders. As of the filing date of this Form 10-Q, the Company has received additional conversion notices for $26.7 million of the principal balance of the 0.25% Senior Notes. Note Hedges To minimize the impact of potential economic dilution upon conversion of the Notes, the Company entered into convertible note hedge transactions with respect to its common stock (“ 0.25% Note Hedges”). (in thousands, except for shares) Date Purchase Shares 0.25% Note Hedges March 2013 $ 153,800 17,308,880 The 0.25% Note Hedges cover shares of the Company’s common stock at a strike price that corresponds to the initial conversion price of the 0.25% Senior Notes, also subject to adjustment, and are exercisable upon conversion of the Notes. The 0.25% Note Hedges will expire upon the maturity of the 0.25% Senior Notes. The 0.25% Note Hedges are intended to reduce the potential economic dilution upon conversion of the 0.25% Senior Notes in the event that the market value per share of the Company’s common stock, as measured under the 0.25% Senior Notes, at the time of exercise is greater than the conversion price of the 0.25% Senior Notes. The 0.25% Note Hedges are separate transactions and are not part of the terms of the 0.25% Senior Notes. Holders of the 0.25% Senior Notes will not have any rights with respect to the 0.25% Note Hedges. The 0.25% Note Hedges do not impact earnings per share. Warrants Date Proceeds (in thousands) Shares Strike Price 0.25% Warrants March 2013 $ 84,800 17,308,880 $ 90.40 In March 2013, the Company also entered into a warrants transaction (“ 0.25% Warrants”), whereby the Company sold warrants to acquire, subject to anti-dilution adjustments, shares of the Company’s common stock. If the 0.25% Warrants are not exercised on their exercise dates, which are in fiscal 2019, they will expire. If the market value per share of the Company's common stock exceeds the applicable exercise price of the 0.25% Warrants, the 0.25% Warrants will have a dilutive effect on the Company's earnings per share if the Company has achieved profitability at that time. The 0.25% Warrants are separate transactions entered into by the Company and are not part of the terms of the 0.25% Senior Notes or the 0.25% Note Hedges. Holders of the 0.25% Senior Notes and 0.25% Note Hedges will not have any rights with respect to the 0.25% Warrants. Term Loan In July 2016, the Company entered into a credit agreement (“Term Loan Credit Agreement”) with Bank of America, N.A. and certain other institutional lenders for a $500.0 million term loan facility (“Term Loan”) that matures on July 11, 2019. The Term Loan will bear interest, at the Company’s option, at either a base rate plus a spread of 0.00% to 0.75% or an adjusted LIBOR rate plus a spread of 1.00% to 1.75% , in each case with such spread being determined based on the Company’s consolidated leverage ratio for the preceding four fiscal quarter period. In July 2016, the Company borrowed the full $500.0 million under the Term Loan. All of the net proceeds of the Term Loan were for the purpose of partially funding the acquisition of Demandware. Interest on the Term Loan is due and payable in arrears quarterly for loans bearing interest at a rate based on the base rate and at the end of an interest period in the case of loans bearing interest at the adjusted LIBOR rate. All outstanding amounts under the Term Loan Credit Agreement will be due and payable on July 11, 2019. The Company may prepay the Term Loan, in whole or in part, at any time without premium or penalty, subject to certain conditions, and amounts repaid or prepaid may not be reborrowed. The Company’s obligations under the Term Loan Credit Agreement are required to be guaranteed by certain of its subsidiaries meeting certain thresholds set forth in the Term Loan Credit Agreement. The Term Loan Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict the Company and its subsidiaries’ ability to, among other things, incur indebtedness, grant liens, merge or consolidate, dispose of assets, make investments, make acquisitions, enter into transactions with affiliates, pay dividends or make distributions and repurchase stock. The Company is also required to maintain compliance with a consolidated leverage ratio and a consolidated interest coverage ratio. The Term Loan Credit Agreement includes customary events of default. Under certain circumstances, a default interest rate will apply on all obligations during the existence of an event of default under the Term Loan Credit Agreement at a per annum rate equal to 2.00% above the applicable interest rate for any overdue principal and 2.00% above the rate applicable for base rate loans for any other overdue amounts. The occurrence of an event of default could result in the acceleration of obligations under the Term Loan Credit Agreement. The Company was in compliance with the Term Loan Credit Agreement’s covenants as of October 31, 2017 . The weighted average interest rate on the Term Loan was 2.2% for the three months ended October 31, 2017 . Accrued interest on the Term Loan was $0.3 million as of October 31, 2017 . As of October 31, 2017 , the noncurrent outstanding principal portion was $500.0 million . Revolving Credit Facility In July 2016, the Company entered into an Amended and Restated Credit Agreement (“ Revolving Loan Credit Agreement ”) with Wells Fargo Bank, National Association, and certain other institutional lenders that provides for $1.0 billion unsecured revolving credit facility (“Credit Facility”) that matures in July 2021. The Revolving Loan Credit Agreement amended and restated the Company’s existing revolving credit facility dated October 2014. The Company may use the proceeds of future borrowings under the Credit Facility for refinancing other indebtedness, working capital, capital expenditures and other general corporate purposes, including permitted acquisitions. The borrowings under the Credit Facility bear interest, at the Company’s option, at a base rate plus a spread of 0.00% to 0.75% or an adjusted LIBOR rate plus a spread of 1.00% to 1.75% , in each case with such spread being determined based on the Company’s consolidated leverage ratio for the preceding four fiscal quarter period. Interest is due and payable in arrears quarterly for loans bearing interest at a rate based on the base rate and at the end of an interest period in the case of loans bearing interest at the adjusted LIBOR rate. Regardless of what amounts, if any, are outstanding under the Credit Facility, the Company is also obligated to pay an ongoing commitment fee on undrawn amounts at a rate of 0.125% to 0.25% , with such rate being based on the Company’s consolidated leverage ratio for the preceding four fiscal quarter period, payable in arrears quarterly. The Revolving Loan Credit Agreement contains customary affirmative and negative covenants, including covenants that limit or restrict the Company and its subsidiaries’ ability to, among other things, incur indebtedness, grant liens, merge or consolidate, dispose of assets, make investments, make acquisitions, enter into transactions with affiliates, pay dividends or make distributions and repurchase stock. The Company is also required to maintain compliance with a consolidated leverage ratio and a consolidated interest coverage ratio. The Revolving Loan Credit Agreement includes customary events of default. Under certain circumstances, a default interest rate will apply on all obligations during the existence of an event of default under the Revolving Loan Credit Agreement at a per annum rate equal to 2.00% above the applicable interest rate for any overdue principal and 2.00% above the rate applicable for base rate loans for any other overdue amounts. The occurrence of an event of default could result in the acceleration of obligations under the Revolving Loan Credit Agreement. The Company was in compliance with the Revolving Loan Credit Agreement’s covenants as of October 31, 2017 . In February 2017, the Company paid down the remaining $200.0 million of outstanding borrowings under the Credit Facility. There were no outstanding borrowings under the Credit Facility as of October 31, 2017 . The Company continues to pay a commitment fee on the available amount of the Credit Facility. Loan Assumed on 50 Fremont The Company assumed a $200.0 million loan with the acquisition of 50 Fremont (“Loan”). The Loan bears an interest rate of 3.75% per annum and is due in June 2023. For the remainder of fiscal 2018, the Loan requires interest only payments. Beginning in fiscal 2019, principal and interest payments are required, with the remaining principal due at maturity. For the three months ended October 31, 2017 and 2016 , total interest expense recognized was $1.8 million and $1.8 million , respectively. For the nine months ended October 31, 2017 and 2016 , total interest expense recognized was $5.6 million and $5.6 million , respectively. The Loan can be prepaid at any time subject to a yield maintenance fee. The agreement governing the Loan contains certain customary affirmative and negative covenants that the Company was in compliance with as of October 31, 2017 . Interest Expense on Convertible Senior Notes, Term Loan, Credit Facility and Loan Assumed on 50 Fremont The following table sets forth total interest expense recognized related to the 0.25% Senior Notes, the Term Loan, the Credit Facility and the Loan (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Contractual interest expense $ 5,766 $ 5,207 $ 17,044 $ 11,398 Amortization of debt issuance costs 1,332 1,342 3,996 4,071 Amortization of debt discount 6,463 6,304 19,269 18,794 $ 13,561 $ 12,853 $ 40,309 $ 34,263

Other Balance Sheet Accounts

Other Balance Sheet Accounts	9 Months Ended
	Oct. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Other Balance Sheet Accounts	Other Balance Sheet Accounts Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands): As of October 31, January 31, Prepaid income taxes $ 43,301 $ 26,932 Other taxes receivable 33,099 34,177 Prepaid expenses and other current assets 393,546 218,418 $ 469,946 $ 279,527 Capitalized Software, net Capitalized software, net at October 31, 2017 and January 31, 2017 was $140.8 million and $141.7 million , respectively. Accumulated amortization relating to capitalized software, net totaled $306.6 million and $250.9 million , respectively, at October 31, 2017 and January 31, 2017 . Capitalized internal-use software amortization expense totaled $18.7 million and $16.6 million for the three months ended October 31, 2017 and 2016 , respectively and $55.7 million and $47.5 million for the nine months ended October 31, 2017 and 2016 , respectively. The Company capitalized $2.0 million and $1.7 million of stock-based expenses related to capitalized internal-use software development during the three months ended October 31, 2017 and 2016 , respectively, and $5.9 million and $5.1 million for the nine months ended October 31, 2017 and 2016 , respectively. Other Assets, net Other assets consisted of the following (in thousands): As of October 31, January 31, Deferred income taxes, noncurrent, net $ 31,596 $ 28,939 Long-term deposits 23,979 23,597 Domain names and patents, net 26,811 39,213 Customer contract assets (1) 201,357 281,733 Other 141,145 113,387 $ 424,888 $ 486,869 (1) Customer contract asset reflects the fair value of future billings of amounts that are contractually committed by acquired companies' existing customers as of the acquisition date. Domain names and patents amortization expense was $4.3 million and $4.1 million for the three months ended October 31, 2017 and 2016 , respectively, and $13.0 million and $11.9 million for the nine months ended October 31, 2017 and 2016 , respectively. Accounts Payable, Accrued Expenses and Other Liabilities Accounts payable, accrued expenses and other liabilities consisted of the following (in thousands): As of October 31, January 31, Accounts payable $ 120,019 $ 115,257 Accrued compensation 622,419 730,390 Non-cash equity liability (1) 49,435 68,355 Accrued other liabilities 488,071 419,299 Accrued income and other taxes payable 193,693 239,699 Accrued professional costs 44,757 38,254 Accrued rent 33,968 19,710 Capital lease obligation, current 114,147 102,106 Financing obligation - leased facility, current 19,899 19,594 $ 1,686,408 $ 1,752,664 (1) Non-cash equity liability represents the purchase price of shares issued to non-executive employees, for those shares exceeding previously registered ESPP shares at the time of sale to the extent the shares had not been subsequently sold by the employee purchaser. The Company expects this liability will be relieved in the fourth quarter of fiscal 2018. Other Noncurrent Liabilities Other noncurrent liabilities consisted of the following (in thousands): As of October 31, January 31, Deferred income taxes and income taxes payable $ 117,193 $ 99,378 Financing obligation - leased facility 198,903 200,711 Long-term lease liabilities and other 420,774 480,850 $ 736,870 $ 780,939

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Oct. 31, 2017
Equity [Abstract]
Stockholders' Equity	Stockholders’ Equity The Company maintains the following stock plans: the ESPP, the 2013 Equity Incentive Plan and the 2014 Inducement Equity Incentive Plan (“2014 Inducement Plan”). The expiration of the 1999 Stock Option Plan (“1999 Plan”) in fiscal 2010 did not affect awards outstanding, which continue to be governed by the terms and conditions of the 1999 Plan. As of October 31, 2017 , $119.2 million has been withheld on behalf of employees for future purchases under the ESPP and is recorded in accounts payable, accrued expenses and other liabilities. Prior to February 2006, options issued under the Company’s stock option plans generally had a term of 10 years. From February 1, 2006 through July 2013, options issued had a term of five years. After July 2013, options issued have a term of seven years. The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions and fair value per share: Three Months Ended Nine Months Ended Stock Options 2017 2016 2017 2016 Volatility 30.8 % 32.3 % 30.8 - 31.4 % 32.1 - 32.3 % Estimated life 3.5 years 3.5 years 3.5 years 3.5 years Risk-free interest rate 1.6 - 1.8 % 0.9 - 1.1 % 1.4 - 1.8 % 0.9 - 1.1 % Weighted-average fair value per share of grants $ 24.12 $ 18.75 $ 22.26 $ 18.75 The Company estimated its future stock price volatility considering both its observed option-implied volatilities and its historical volatility calculations. Management believes this is the best estimate of the expected volatility over the expected life of its stock options and stock purchase rights. The estimated life for the stock options was based on an analysis of historical exercise activity. The risk-free interest rate is based on the rate for a U.S. government security with the same estimated life at the time of the option grant and the stock purchase rights. ESPP assumptions and the related fair value per share table will only be disclosed in the three month period in which there is ESPP activity, such as an ESPP purchase. The Company's ESPP allows for two purchases during the year, one during the second quarter and one during the fourth quarter. The estimated life of the ESPP will be based on the two purchase periods within each offering period. The weighted-average fair value per share of grants was $21.13 and $21.93 for the three months ended July 31, 2017 and 2016, respectively. The estimated forfeiture rate applied is based on historical forfeiture rates. The Company does not anticipate paying any cash dividends in the foreseeable future and therefore uses an expected dividend yield of zero in the option pricing model. During fiscal 2016, the Company granted a performance-based restricted stock unit award to the Chairman of the Board and Chief Executive Officer and during fiscal 2017, the Company granted performance-based restricted stock unit awards to certain executive officers, including the Chairman of the Board and Chief Executive Officer. The performance-based restricted stock unit awards are subject to vesting based on a performance-based condition and a service-based condition. At the end of the three -year service period, based on the Company's share price performance, these performance-based restricted stock units will vest in a percentage of the target number of shares between 0 and 200% , depending on the extent the performance condition is achieved. Stock activity excluding the ESPP is as follows: Options Outstanding Shares Available for Grant Outstanding Stock Options Weighted- Average Exercise Price Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2017 16,531,822 30,353,076 $ 59.88 Increase in shares authorized: 2013 Equity Incentive Plan 37,009,109 0 0.00 2014 Inducement Plan 16,198 0 0.00 Options granted under all plans (1,020,046 ) 1,020,046 89.01 Restricted stock activity (2,696,029 ) 0 0.00 Stock grants to board and advisory board members (163,596 ) 0 0.00 Exercised 0 (6,705,729 ) 43.57 Plan shares expired (44,309 ) 0 0.00 Canceled 1,314,229 (1,314,229 ) 71.92 Balance as of October 31, 2017 50,947,378 23,353,164 $ 65.16 $ 868,266 Vested or expected to vest 21,891,255 $ 64.58 $ 826,607 Exercisable as of October 31, 2017 10,090,058 $ 57.62 $ 451,210 The total intrinsic value of the options exercised during the nine months ended October 31, 2017 and 2016 was $298.7 million and $176.2 million , respectively. The intrinsic value is the difference between the current market value of the stock and the exercise price of the stock option. The weighted-average remaining contractual life of vested and expected to vest options is approximately 5 years. As of October 31, 2017 , options to purchase 10,090,058 shares were vested at a weighted average exercise price of $57.62 per share and had a remaining weighted-average contractual life of approximately 4 years. The total intrinsic value of these vested options as of October 31, 2017 was $451.2 million . During the nine months ended October 31, 2017 , the Company recognized stock-based expense related to its equity plans for employees and non-employee directors of $759.3 million . As of October 31, 2017 , the aggregate stock compensation remaining to be amortized to costs and expenses was approximately $2.0 billion . The Company will amortize this stock compensation balance as follows: $234.5 million during the remaining three months of fiscal 2018 ; $777.8 million during fiscal 2019 ; $574.4 million during fiscal 2020 ; $303.6 million during fiscal 2021 ; $42.9 million during fiscal 2022 and $25.2 million thereafter. The expected amortization reflects only outstanding stock awards as of October 31, 2017 and assumes no forfeiture activity. The aggregate stock compensation remaining to be amortized to costs and expenses will be recognized over a weighted average period of 1.9 years. The following table summarizes information about stock options outstanding as of October 31, 2017 : Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted- Average Remaining Contractual Life (Years) Weighted- Average Exercise Price Number of Shares Weighted- Average Exercise Price $0.86 to $52.30 4,540,787 4.4 $ 35.63 3,693,473 $ 41.41 $53.60 to $58.86 724,916 3.8 55.57 478,771 55.61 $59.34 4,826,489 4.1 59.34 3,309,418 59.34 $59.37 to $75.01 1,553,021 5.2 69.76 500,029 70.21 $75.57 5,576,546 6.0 75.57 0 0.00 $76.48 to $80.62 577,049 5.6 78.54 175,146 78.59 $80.99 to $98.90 5,554,356 5.3 82.48 1,933,221 80.99 23,353,164 5.0 $ 65.16 10,090,058 $ 57.62 Restricted stock activity is as follows: Restricted Stock Outstanding Outstanding Weighted- Average Exercise Price Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2017 27,453,498 $ 0.001 Granted - restricted stock units and awards 2,844,391 0.001 Canceled (1,606,148 ) 0.001 Vested and converted to shares (6,105,427 ) 0.001 Balance as of October 31, 2017 22,586,314 $ 0.001 $ 2,311,483 Expected to vest 19,722,393 $ 2,018,390 The restricted stock, which upon vesting entitles the holder to one share of common stock for each share of restricted stock, has an exercise price of $0.001 per share, which is equal to the par value of the Company’s common stock, and generally vests over four years . The weighted-average grant date fair value of the restricted stock issued for the nine months ended October 31, 2017 and 2016 was $89.04 and $76.90 , respectively. Common Stock The following number of shares of common stock were reserved and available for future issuance at October 31, 2017 : Options outstanding 23,353,164 Restricted stock awards and units and performance stock units outstanding 22,586,314 Stock available for future grant: 2013 Equity Incentive Plan 50,316,168 2014 Inducement Plan 520,478 Amended and Restated 2004 Employee Stock Purchase Plan 9,629,807 Acquired equity plans 110,732 Convertible Senior Notes 17,308,564 Warrants 17,308,880 141,134,107

Income Taxes

Income Taxes	9 Months Ended
	Oct. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Effective Tax Rate The Company computes its year-to-date provision for income taxes by applying the estimated annual effective tax rate to year to date pretax income or loss and adjusts the provision for discrete tax items recorded in the period. For the nine months ended October 31, 2017 , the Company reported a tax provision of $54.0 million on a pretax income of $113.9 million , which resulted in an effective tax rate of 47 percent . The Company recorded year-to-date tax provision primarily from profitable jurisdictions outside of the United States. The Company regularly assesses the realizability of the deferred tax assets and establishes a valuation allowance if it is more-likely-than-not that some or all of the Company's deferred tax assets will not be realized. The Company evaluates and weighs all available positive and negative evidence such as historic results, future reversals of existing deferred tax liabilities, projected future taxable income, as well as prudent and feasible tax-planning strategies. Generally, more weight is given to objectively verifiable evidence. The Company will continue to assess the realizability of the deferred tax assets in each of the applicable jurisdictions going forward. The Company will adjust its valuation allowance in the event sufficient positive evidence overcomes the negative evidence of losses in recent years, for example, if the trend in increasing annual taxable income continues. For the nine months ended October 31, 2016 , the Company reported a tax benefit of $182.2 million on a pretax income of $48.9 million , which resulted in a negative effective tax rate of 373 percent . The most significant component of this tax amount was the discrete tax benefit of $205.6 million from a partial release of the valuation allowance in connection with the acquisition of Demandware. The net deferred tax liability from the acquisition of Demandware provided a source of additional income to support the realizability of the Company's pre-existing deferred tax assets and as a result, the Company released a portion of its valuation allowance. The tax benefit associated with the release of the valuation allowance was partially offset by income taxes in profitable jurisdictions outside of the United States. Tax Benefits Related to Stock-Based Compensation The income tax benefit related to stock-based compensation was $206.8 million and $161.4 million for the nine months ended October 31, 2017 and 2016 , respectively, the majority of which was not recognized as a result of the valuation allowance. Unrecognized Tax Benefits and Other Considerations The Company records liabilities related to its uncertain tax positions. Tax positions for the Company and its subsidiaries are subject to income tax audits by multiple tax jurisdictions throughout the world. Certain prior year tax returns are currently being examined by various taxing authorities in countries including the United States, France, United Kingdom and Germany. In March 2017, the Company received the final notice of proposed adjustments primarily related to transfer pricing issues from the Internal Revenue Service ("IRS") for fiscal 2011 and fiscal 2012. Accordingly, the Company re-assessed and adjusted its reserves, which resulted in a net immaterial impact to the tax provision due to its valuation allowance. The Company is currently appealing the IRS proposed adjustments. The Company believes that it has provided adequate reserves for its income tax uncertainties in all open tax years. As the outcome of the tax audits cannot be predicted with certainty, if any issues addressed in the Company's tax audits are resolved in a manner inconsistent with management's expectations, the Company could adjust its provision for income taxes in the future. Generally, any adjustments resulting from the U.S. audits should not have a significant impact to the Company's tax provision due to its valuation allowance. In addition, the Company anticipates it is reasonably possible that a decrease of unrecognized tax benefits up to approximately $6.8 million may occur in the next 12 months, as the applicable statutes of limitations lapse.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Oct. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income by the weighted-average number of common shares outstanding for the fiscal period. Diluted earnings per share is computed by giving effect to all potential weighted average dilutive common stock, including options, restricted stock units, warrants and the convertible senior notes. The dilutive effect of outstanding awards and convertible securities is reflected in diluted earnings per share by application of the treasury stock method. A reconciliation of the denominator used in the calculation of basic and diluted earnings per share is as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Numerator: Net income (loss) $ 51,394 $ (37,309 ) $ 59,923 $ 231,072 Denominator: Weighted-average shares outstanding for basic earnings (loss) per share 717,445 690,468 711,884 683,075 Effect of dilutive securities: Convertible senior notes 5,162 0 4,571 1,994 Employee stock awards 14,717 0 13,235 11,188 Warrants 782 0 522 0 Adjusted weighted-average shares outstanding and assumed conversions for diluted earnings (loss) per share 738,106 690,468 730,212 696,257 The weighted-average number of shares outstanding used in the computation of diluted earnings per share does not include the effect of the following potential outstanding common stock. The effects of these potentially outstanding shares were not included in the calculation of diluted earnings per share because the effect would have been anti-dilutive (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Employee stock awards 1,355 17,946 9,239 8,640 Convertible senior notes 0 17,309 0 0 Warrants 0 17,309 0 17,309

Commitments

Commitments	9 Months Ended
	Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments Letters of Credit As of October 31, 2017 , the Company had a total of $96.6 million in letters of credit outstanding substantially in favor of certain landlords for office space. These letters of credit renew annually and expire at various dates through December 2030. Leases The Company leases facilities space and certain fixed assets under non-cancelable operating and capital leases with various expiration dates. As of October 31, 2017 , the future minimum lease payments under non-cancelable operating and capital leases are as follows (in thousands): Capital Operating Financing Obligation -Leased Facility (1) Fiscal Period: Remaining three months of Fiscal 2018 $ 22,974 $ 152,711 $ 5,433 Fiscal 2019 115,830 575,237 21,881 Fiscal 2020 201,616 503,390 22,325 Fiscal 2021 73 368,148 22,770 Fiscal 2022 37 282,804 23,214 Thereafter 3 1,408,213 210,713 Total minimum lease payments 340,533 $ 3,290,503 $ 306,336 Less: amount representing interest (23,384 ) Present value of capital lease obligations $ 317,149 ______________ (1) Total Financing Obligation - Leased Facility noted above represents the total obligation on the lease agreement including amounts allocated to interest and the implied lease for the land as noted in Note 5 “Property and Equipment.” As of October 31, 2017 , $218.8 million of the total $306.3 million above was recorded to Financing obligation leased facility, of which the current portion is included in "Accounts payable, accrued expenses and other liabilities" and the noncurrent portion is included in “Other noncurrent liabilities” on the consolidated balance sheets. The Company’s agreements for the facilities and certain services provide the Company with the option to renew. The Company’s future contractual obligations would change if the Company exercised these options. The terms of the lease agreements provide for rental payments on a graduated basis. The Company recognizes rent expense on a straight-line basis over the lease period and has accrued for rent expense incurred but not paid. Of the total operating lease commitment balance of $3.3 billion , approximately $2.7 billion is related to facilities space. The remaining commitment amount is related to computer equipment and furniture and fixtures. Other Purchase Commitments In April 2016, the Company entered into an agreement with a third-party provider for certain infrastructure services for a period of four years . The Company paid $96.0 million in connection with this agreement during the nine months ended October 31, 2017 . The agreement further provides that the Company will pay an additional $108.0 million in fiscal 2019 and $126.0 million in fiscal 2020.

Legal Proceedings and Claims

Legal Proceedings and Claims	9 Months Ended
	Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Legal Proceedings and Claims	Legal Proceedings and Claims In the ordinary course of business, the Company is or may be involved in various legal proceedings and claims related to alleged infringement of third-party patents and other intellectual property rights, commercial, corporate and securities, labor and employment, class actions, wage and hour, and other claims. The Company has been, and may in the future be put on notice and/or sued by third-parties for alleged infringement of their proprietary rights, including patent infringement. In general, the resolution of a legal matter could prevent the Company from offering its service to others, could be material to the Company’s financial condition or cash flows, or both, or could otherwise adversely affect the Company’s operating results. The Company makes a provision for a liability relating to legal matters when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. These provisions are reviewed at least quarterly and adjusted to reflect the impacts of negotiations, estimated settlements, legal rulings, advice of legal counsel and other information and events pertaining to a particular matter. The outcomes of legal proceedings and other contingencies are, however, inherently unpredictable and subject to significant uncertainties. As a result, the Company is not able to reasonably estimate the amount or range of possible losses in excess of any amounts accrued, including losses that could arise as a result of application of non-monetary remedies, with respect to the contingencies it faces, and the Company’s estimates may not prove to be accurate. In management’s opinion, resolution of all current matters is not expected to have a material adverse impact on the Company’s consolidated results of operations, cash flows or financial position. However, depending on the nature and timing of any such dispute, an unfavorable resolution of a matter could materially affect the Company’s current or future results of operations or cash flows, or both, in a particular quarter. In September 2013, one of the Company’s subsidiaries, ExactTarget, Inc. (“ExactTarget”), was added as a defendant in a purported class-action lawsuit that alleged that ExactTarget and one of its customers, Simply Fashion Stores, Ltd. (“Simply Fashion”), violated the Telephone Consumer Protection Act (“TCPA”) as a result of Simply Fashion’s text messaging campaigns and alleged failure to opt-out certain Simply Fashion customers from receiving messages. The complaint was subsequently amended to remove Simply Fashion as a defendant and the lawsuit is currently before the United States District Court for the Southern District of Indiana. The complaint seeks statutory damages and injunctive relief. While disputing the allegations of wrongdoing, the Company has reached a settlement of the lawsuit for approximately $6.3 million . The parties have submitted the settlement agreement to the Court for approval.

Related-Party Transactions

Related-Party Transactions	9 Months Ended
	Oct. 31, 2017
Related Party Transactions [Abstract]
Related-Party Transactions	Related-Party Transactions In January 1999, the Salesforce.com Foundation, also referred to as the Foundation, was chartered on an idea of leveraging the Company’s people, technology, and resources to help improve communities around the world. The Company calls this integrated philanthropic approach the 1-1-1 model. Beginning in 2008, Salesforce.org, which is a non-profit public benefit corporation, was established to resell the Company's services to nonprofit organizations and certain higher education organizations. The Company’s Chairman is the chairman of both the Foundation and Salesforce.org. The Company’s Chairman holds one of the three Foundation board seats. The Company’s Chairman, one of the Company’s employees and one of the Company’s board members hold three of Salesforce.org’s nine board seats. The Company does not control the Foundation’s or Salesforce.org's activities, and accordingly, the Company does not consolidate either of the related entities' statement of activities with its financial results. Since the Foundation’s and Salesforce.org’s inception, the Company has provided at no charge certain resources to those entities' employees such as office space, furniture, equipment, facilities, services, and other resources. The value of these items was approximately $7.4 million for the nine months ended October 31, 2017 . Additionally, the Company allows Salesforce.org to donate subscriptions of the Company’s services to other qualified non-profit organizations. The Company also allows Salesforce.org to resell the Company’s service to non-profit organizations and certain education entities. The Company does not charge Salesforce.org for these subscriptions, therefore income from subscriptions sold to non-profit organizations is donated back to the community through charitable grants made by the Foundation and Salesforce.org. The value of the subscriptions sold by Salesforce.org pursuant to the reseller agreement, as amended, was approximately $129.7 million for the nine months ended October 31, 2017 .

Summary of Business and Signi23

Summary of Business and Significant Accounting Policies (Policies)	9 Months Ended
	Oct. 31, 2017
Accounting Policies [Abstract]
Fiscal Year	Fiscal Year The Company’s fiscal year ends on January 31. References to fiscal 2018 , for example, refer to the fiscal year ending January 31, 2018 .
Basis of Presentation	Basis of Presentation The accompanying consolidated balance sheet as of October 31, 2017 and the consolidated statements of operations, consolidated statements of comprehensive income (loss) and consolidated statements of cash flows for the three and nine months ended October 31, 2017 and 2016 , respectively, are unaudited. These financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”) for interim financial information. Accordingly, they do not include all of the financial information and footnotes required by U.S. GAAP for complete financial statements. In the opinion of the Company’s management, the unaudited consolidated financial statements include all adjustments necessary for the fair presentation of the Company’s balance sheet as of October 31, 2017 , and its results of operations, including its comprehensive income (loss) , and its cash flows for the three and nine months ended October 31, 2017 and 2016 . All adjustments are of a normal recurring nature. The results for the three and nine months ended October 31, 2017 are not necessarily indicative of the results to be expected for any subsequent quarter or for the fiscal year ending January 31, 2018 . These unaudited interim consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in the Company's Annual Report on Form 10-K for the fiscal year ended January 31, 2017 , filed with the Securities and Exchange Commission (the “SEC”) on March 6, 2017 .
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions in the Company’s consolidated financial statements and notes thereto. Significant estimates and assumptions made by management include the determination of: • the best estimate of selling price of the deliverables included in multiple deliverable revenue arrangements; • the fair value of assets acquired and liabilities assumed for business combinations; • the recognition, measurement and valuation of current and deferred income taxes; • the fair value of certain stock awards issued; • the useful lives of intangible assets, property and equipment and building and structural components; and • the valuation of strategic investments and the determination of other-than-temporary impairments. Actual results could differ materially from those estimates. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the result of which forms the basis for making judgments about the carrying values of assets and liabilities.
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Segments	Segments The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker, who is the chief executive officer, in deciding how to allocate resources and assessing performance. Over the past few years, the Company has completed a number of acquisitions. These acquisitions have allowed the Company to expand its offerings, presence and reach in various market segments of the enterprise cloud computing market. While the Company has offerings in multiple enterprise cloud computing market segments, including as a result of the Company's acquisitions, the Company’s business operates in one operating segment because the majority of the Company's offerings operate on a single platform and are deployed in an identical way, and the Company’s chief operating decision maker evaluates the Company’s financial information and resources and assesses the performance of these resources on a consolidated basis. Since the Company operates in one operating segment, all required financial segment information can be found in the consolidated financial statements.
Concentrations of Credit Risk and Significant Customers	Concentrations of Credit Risk and Significant Customers The Company’s financial instruments that are exposed to concentrations of credit risk consist primarily of cash and cash equivalents, marketable securities and accounts receivable. In addition, in connection with the Company's 0.25% Senior Notes (as defined in Note 8 "Debt"), which were issued in March 2013, the Company entered into convertible note hedge transactions with respect to its common stock, which are exposed to concentrations of credit risk. Collateral is not required for accounts receivable or the note hedge transactions. The Company maintains an allowance for its doubtful accounts receivable. This allowance is based upon historical loss patterns, the number of days that billings are past due and an evaluation of the potential risk of loss associated with delinquent accounts. Receivables are written-off and charged against its recorded allowance when the Company has exhausted collection efforts without success.
Revenue Recognition	Revenue Recognition The Company derives its revenues from two sources: (1) subscription revenues, which are comprised of subscription fees from customers accessing the Company’s enterprise cloud computing services and from customers paying for additional support beyond the standard support that is included in the basic subscription fees; and (2) related professional services such as process mapping, project management, implementation services and other revenue. Other revenue consists primarily of training fees. The Company commences revenue recognition when all of the following conditions are satisfied: • there is persuasive evidence of an arrangement; • the service has been or is being provided to the customer; • the collection of the fees is reasonably assured; and • the amount of fees to be paid by the customer is fixed or determinable. The Company’s subscription service arrangements are non-cancelable and do not contain refund-type provisions. Subscription and Support Revenues Subscription and support revenues are recognized ratably over the contract terms beginning on the commencement date of each contract, which is the date the Company’s service is made available to customers. Amounts that have been invoiced are recorded in accounts receivable and in deferred revenue or revenue, depending on whether the revenue recognition criteria have been met. Professional Services and Other Revenues The Company’s professional services contracts are either on a time and materials, fixed fee or subscription basis. These revenues are recognized as the services are rendered for time and materials contracts, when the milestones are achieved and accepted by the customer or on a proportional performance basis for fixed price contracts and ratably over the contract term for subscription professional services contracts. The milestone method for revenue recognition is used when there is substantive uncertainty at the date the contract is entered into whether the milestone will be achieved. Training revenues are recognized as the services are performed. Multiple Deliverable Arrangements The Company enters into arrangements with multiple deliverables that generally include multiple subscriptions, premium support and professional services. If the deliverables have standalone value at contract inception, the Company accounts for each deliverable separately. Subscription services have standalone value as such services are often sold separately. In determining whether professional services have standalone value, the Company considers the following factors for each professional services agreement: availability of the services from other vendors, the nature of the professional services, the timing of when the professional services contract was signed in comparison to the subscription service start date and the contractual dependence of the subscription service on the customer’s satisfaction with the professional services work. To date, the Company has concluded that all of the professional services included in multiple deliverable arrangements executed have standalone value. Multiple deliverables included in an arrangement are separated into different units of accounting and the arrangement consideration is allocated to the identified separate units based on a relative selling price hierarchy. The Company determines the relative selling price for a deliverable based on its vendor-specific objective evidence of selling price (“VSOE”), if available, or its best estimate of selling price (“BESP”), if VSOE is not available. The Company has determined that third-party evidence of selling price (“TPE”) is not a practical alternative due to differences in its service offerings compared to other parties and the availability of relevant third-party pricing information. The amount of revenue allocated to delivered items is limited by contingent revenue, if any. For certain professional services, the Company has established VSOE as a consistent number of standalone sales of these deliverables have been priced within a reasonably narrow range. The Company has not established VSOE for its subscription services due to lack of pricing consistency, the introduction of new services and other factors. Accordingly, the Company uses its BESP to determine the relative selling price for its subscription services. The Company determines BESP by considering its overall pricing objectives and market conditions. Significant pricing practices taken into consideration include the Company’s discounting practices, the size and volume of the Company’s transactions, the customer demographic, the geographic area where services are sold, price lists, its go-to-market strategy, historical standalone sales and contract prices. The determination of BESP is made through consultation with and approval by the Company’s management, taking into consideration the go-to-market strategy. As the Company’s go-to-market strategies evolve, the Company may modify its pricing practices in the future, which could result in changes in relative selling prices, including both VSOE and BESP.
Deferred Revenue	Deferred Revenue The deferred revenue balance does not represent the total contract value of annual or multi-year, non-cancelable subscription agreements. Deferred revenue primarily consists of billings or payments received in advance of revenue recognition from subscription services described above and is recognized as the revenue recognition criteria are met. The Company generally invoices customers in annual installments. The deferred revenue balance is influenced by several factors, including seasonality, the compounding effects of renewals, invoice duration, invoice timing, dollar size and new business linearity within the quarter.
Deferred Commissions	Deferred Commissions Deferred commissions are the incremental costs that are directly associated with non-cancelable subscription contracts with customers and consist of sales commissions paid to the Company’s direct sales force. The commissions are deferred and amortized over the non-cancelable terms of the related customer contracts, which are typically 12 to 36 months . The commission payments are paid in full the month after the customer’s service commences and are a direct and incremental cost of the revenue arrangements. The deferred commission amounts are recoverable through the future revenue streams under the non-cancelable customer contracts. The Company believes this is the preferable method of accounting as the commission charges are so closely related to the revenue from the non-cancelable customer contracts that they should be recorded as an asset and charged to expense over the same period that the subscription revenue is recognized. Amortization of deferred commissions is included in marketing and sales expense in the accompanying consolidated statements of operations.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash and cash equivalents are stated at fair value.
Marketable Securities	Marketable Securities The Company considers all of its marketable debt securities as available for use in current operations, including those with maturity dates beyond one year, and therefore classifies these securities within current assets on the consolidated balance sheets. Securities are classified as available for sale and are carried at fair value, with the change in unrealized gains and losses, net of tax, reported as a separate component on the consolidated statements of comprehensive income until realized. Fair value is determined based on quoted market rates when observable or utilizing data points that are observable, such as quoted prices, interest rates and yield curves. Declines in fair value judged to be other-than-temporary on securities available for sale are included as a reduction to investment income. In order to determine whether a decline in value is other-than-temporary, the Company evaluates, among other factors: the duration and extent to which the fair value has been less than the carrying value and its intent and ability to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value. For the purposes of computing realized and unrealized gains and losses, the cost of securities sold is based on the specific-identification method. Interest on securities classified as available for sale is also included as a component of investment income.
Strategic Investments	Strategic Investments The Company holds certain marketable equity and non-marketable debt and equity securities within its strategic investments portfolio. Marketable equity securities are measured using quoted prices in their respective active markets, non-marketable debt securities are recorded at their estimated fair value and the non-marketable equity securities are recorded at cost. Marketable equity securities and non-marketable debt securities, which consist of noncontrolling debt investments in privately held companies, are recorded at fair value with changes in fair value recorded through accumulated other comprehensive income. Equity investments without readily determinable fair values for which the Company does not have the ability to exercise significant influence are accounted for using the cost method of accounting. Under the cost method of accounting, the non-marketable securities are carried at cost and are adjusted only for other-than-temporary impairments, certain distributions and additional investments. These investments are valued using significant unobservable inputs or data in an inactive market and the valuation requires the Company's judgment due to the absence of market prices and inherent lack of liquidity. The estimated fair value is based on quantitative and qualitative factors including, but not limited to, subsequent financing activities by the investee and projected discounted cash flows. Fair value is not estimated for non-marketable equity securities if there are no identified events or changes in circumstances that may have an effect on the fair value of the investment. The carrying value of the Company’s strategic investments is impacted by various events such as entering into new investments, dispositions due to acquisitions, fair market value adjustments or initial public offerings. The cash inflows from exits and cash outflows for new investments are disclosed as strategic investments within the investing activities section of the statement of cash flows and any gains or losses are recorded within the operating activities of the statements of cash flows for each of the respective fiscal quarter periods.
Derivative Financial Instruments	Derivative Financial Instruments The Company enters into foreign currency derivative contracts with financial institutions to reduce foreign exchange risk. The Company uses forward currency derivative contracts to minimize the Company’s exposure to balances primarily denominated in the Euro, British Pound Sterling, Japanese Yen, Canadian Dollar and Australian Dollar. The Company’s foreign currency derivative contracts, which are not designated as hedging instruments, are used to reduce the exchange rate risk associated primarily with intercompany receivables and payables. The Company’s derivative financial instruments program is not designated for trading or speculative purposes. As of October 31, 2017 and January 31, 2017 , the foreign currency derivative contracts that were not settled were recorded at fair value on the consolidated balance sheets. Foreign currency derivative contracts are marked-to-market at the end of each reporting period with gains and losses recognized as other expense to offset the gains or losses resulting from the settlement or remeasurement of the underlying foreign currency denominated receivables and payables. While the contract or notional amount is often used to express the volume of foreign currency derivative contracts, the amounts potentially subject to credit risk are generally limited to the amounts, if any, by which the counterparties’ obligations under the agreements exceed the obligations of the Company to the counterparties.
Fair Value Measurement	Fair Value Measurement The Company measures its cash and cash equivalents, marketable securities and foreign currency derivative contracts at fair value. The additional disclosures regarding the Company’s fair value measurements are included in Note 4 “Fair Value Measurement.”
Property and Equipment	Property and Equipment Property and equipment are stated at cost. Depreciation is calculated on a straight-line basis over the estimated useful lives of those assets as follows: Computers, equipment and software 3 to 9 years Furniture and fixtures 5 years Leasehold improvements Shorter of the estimated lease term or 10 years Building and structural components Average weighted useful life of 32 years Building - leased facility 27 years Building improvements 10 years When assets are retired or otherwise disposed of, the cost and accumulated depreciation and amortization are removed from their respective accounts and any loss on such retirement is reflected in operating expenses.
Capitalized Software Costs	Capitalized Software Costs The Company capitalizes costs related to its enterprise cloud computing services and certain projects for internal use incurred during the application development stage. Costs related to preliminary project activities and post implementation activities are expensed as incurred. Internal-use software is amortized on a straight-line basis over its estimated useful life, which is generally three to five years. Management evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.
Intangible Assets acquired through Business Combinations	Intangible Assets acquired through Business Combinations Intangible assets are amortized over their estimated useful lives. Each period, the Company evaluates the estimated remaining useful life of its intangible assets and whether events or changes in circumstances warrant a revision to the remaining period of amortization.
Impairment Assessment	Impairment Assessment The Company evaluates intangible assets and long-lived assets for possible impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. This includes but is not limited to significant adverse changes in business climate, market conditions, or other events that indicate an asset's carrying amount may not be recoverable. Recoverability of these assets is measured by comparing the carrying amount of each asset to the future undiscounted cash flows the asset is expected to generate. If the undiscounted cash flows used in the test for recoverability are less than the carrying amount of these assets, the carrying amount of such assets is reduced to fair value. The Company evaluates and tests the recoverability of its goodwill for impairment at least annually during its fourth quarter of each fiscal year or more often if and when circumstances indicate that goodwill may not be recoverable. There was no impairment of intangible assets, long-lived assets or goodwill during the three and nine months ended October 31, 2017 and 2016 .
Business Combinations	Business Combinations The Company uses its best estimates and assumptions to accurately assign fair value to the tangible and intangible assets acquired and liabilities assumed at the acquisition date. The Company’s estimates are inherently uncertain and subject to refinement. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed, with the corresponding offset to goodwill. In addition, uncertain tax positions and tax-related valuation allowances are initially established in connection with a business combination as of the acquisition date. The Company continues to collect information and reevaluates these estimates and assumptions quarterly and records any adjustments to the Company’s preliminary estimates to goodwill provided that the Company is within the measurement period. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired or liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the Company’s consolidated statements of operations. In the event the Company acquires an entity with which the Company has a preexisting relationship, the Company will recognize a gain or loss to settle that relationship as of the acquisition date, which is recorded in other income (expense) within the statements of operations. In the event that the Company acquires an entity in which the Company previously held a strategic investment, the difference between the fair value of the shares as of the date of the acquisition and the carrying value of the strategic investment is recorded as a gain or loss and disclosed separately within the statements of operations.
Leases and Asset Retirement Obligations	Leases and Asset Retirement Obligations The Company categorizes leases at their inception as either operating or capital leases. In certain lease agreements, the Company may receive rent holidays and other incentives. The Company recognizes lease costs on a straight-line basis once control of the space is achieved, without regard to deferred payment terms such as rent holidays that defer the commencement date of required payments. Additionally, incentives received are treated as a reduction of costs over the term of the agreement. The Company establishes assets and liabilities for the present value of estimated future costs to retire long-lived assets at the termination or expiration of a lease. Such assets are depreciated over the lease period to operating expense. In the event the Company is the deemed owner for accounting purposes during construction, the Company records assets and liabilities for the estimated construction costs incurred under build-to-suit lease arrangements to the extent it is involved in the construction of structural improvements or takes construction risk prior to commencement of a lease. The Company additionally has entered into subleases for unoccupied leased office space. To the extent there are losses associated with the sublease, they are recognized in the period the sublease is executed. Gains are recognized over the sublease life. Any sublease payments received in excess of the straight-line rent payments for the sublease are recorded in other income (expense).
Accounting for Stock-Based Expense	Accounting for Stock-Based Expense The Company recognizes stock-based expenses related to stock options and restricted stock awards on a straight-line basis, net of forfeitures, over the requisite service period of the awards, which is generally the vesting term of four years . The Company recognizes stock-based expenses related to shares issued pursuant to its Amended and Restated 2004 Employee Stock Purchase Plan (“ESPP” or “2004 Employee Stock Purchase Plan”) on a straight-line basis over the offering period, which is 12 months . Stock-based expenses related to performance share grants are measured based on grant date fair value and expensed on a straight-line basis over the service period of the awards, which is generally the vesting term of three years. The Company, at times, grants unvested restricted shares to employee stockholders of certain acquired companies in lieu of cash consideration. These awards are generally subject to continued post-acquisition employment. Therefore, the Company accounts for them as post-acquisition stock-based expense. The Company recognizes stock-based expense equal to the grant date fair value of the restricted stock awards on a straight-line basis over the requisite service period of the awards, which is generally four years .
Income Taxes	Income Taxes The Company uses the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on temporary differences between the financial statement and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect on deferred tax assets and liabilities of a change in tax laws is recognized in the consolidated statements of operations in the period that includes the enactment date. The Company’s tax positions are subject to income tax audits by multiple tax jurisdictions throughout the world. The Company recognizes the tax benefit of an uncertain tax position only if it is more likely than not that the position is sustainable upon examination by the taxing authority, solely based on its technical merits. The tax benefit recognized is measured as the largest amount of benefit which is greater than 50 percent likely to be realized upon settlement with the taxing authority. The Company recognizes interest accrued and penalties related to unrecognized tax benefits in the income tax provision. Valuation allowances are established when necessary to reduce deferred tax assets to the amounts that are more likely than not expected to be realized based on the weighting of positive and negative evidence. Future realization of deferred tax assets ultimately depends on the existence of sufficient taxable income of the appropriate character (for example, ordinary income or capital gain) within the carryback or carryforward periods available under the applicable tax law. The Company regularly reviews the deferred tax assets for recoverability based on historical taxable income, projected future taxable income, the expected timing of the reversals of existing temporary differences and tax planning strategies. The Company’s judgments regarding future profitability may change due to many factors, including future market conditions and the ability to successfully execute its business plans and/or tax planning strategies. Should there be a change in the ability to recover deferred tax assets, the tax provision would increase or decrease in the period in which the assessment is changed.
Foreign Currency Translation	Foreign Currency Translation The functional currency of the Company’s major foreign subsidiaries is generally the local currency. Adjustments resulting from translating foreign functional currency financial statements into U.S. dollars are recorded as a separate component on the consolidated statements of comprehensive income. Foreign currency transaction gains and losses are included in Other income (expense) in the consolidated statements of operations for the period. All assets and liabilities denominated in a foreign currency are translated into U.S. dollars at the exchange rate on the balance sheet date. Revenues and expenses are translated at the average exchange rate during the period. Equity transactions are translated using historical exchange rates.
Warranties and Indemnification	Warranties and Indemnification The Company’s enterprise cloud computing services are typically warranted to perform in a manner consistent with general industry standards that are reasonably applicable and materially in accordance with the Company’s online help documentation under normal use and circumstances. The Company’s arrangements generally include certain provisions for indemnifying customers against liabilities if its products or services infringe a third party’s intellectual property rights. To date, the Company has not incurred any material costs as a result of such obligations and has not accrued any material liabilities related to such obligations in the accompanying consolidated financial statements. The Company has also agreed to indemnify its directors and executive officers for costs associated with any fees, expenses, judgments, fines and settlement amounts incurred by any of these persons in any action or proceeding to which any of those persons is, or is threatened to be, made a party by reason of the person’s service as a director or officer, including any action by the Company, arising out of that person’s services as the Company’s director or officer or that person’s services provided to any other company or enterprise at the Company’s request. The Company maintains director and officer insurance coverage that would generally enable the Company to recover a portion of any future amounts paid. The Company may also be subject to indemnification obligations by law with respect to the actions of its employees under certain circumstances and in certain jurisdictions.
New Accounting Pronouncements Adopted and Pending Adoption	New Accounting Pronouncements Adopted in Fiscal 2018 In January 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update No. 2017-01, "Business Combinations (Topic 805) Clarifying the Definition of a Business" ("ASU 2017-01") which amended the existing FASB Accounting Standards Codification. The standard provides additional guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The definition of a business affects many areas of accounting, including acquisitions, disposals, goodwill, and consolidation. ASU 2017-01 is effective for fiscal 2019 with early adoption permitted. The Company early adopted the standard in the first quarter of fiscal 2018 on a prospective basis. Since the Company has not acquired any material businesses since the start of the year, this standard has had no impact on the Company's financial statements. In May 2017, the FASB issued Accounting Standards Update No. 2017-09, "Compensation—Stock Compensation (Topic 718): Scope of Modification Accounting" ("ASU 2017-09") which amended the existing FASB Accounting Standards Codification. The standard provides clarity and reduces the cost and complexity when applying the guidance in Topic 718, Compensation—Stock Compensation, to a change to the terms or conditions of a share-based payment award. ASU 2017-09 is effective for fiscal 2019 with early adoption permitted. The Company early adopted the standard in the second quarter of fiscal 2018 on a prospective basis and does not expect it to have any impact on the Company's financial statements. Accounting Pronouncements Pending Adoption In May 2014, the FASB issued Accounting Standards Update No. 2014-09, "Revenue from Contracts with Customers (Topic 606)" ("ASU 2014-09"), which amended the existing FASB Accounting Standards Codification, replaces existing revenue recognition guidance with a comprehensive revenue measurement and recognition standard and expanded disclosure requirements. The standard also provides guidance on the recognition of costs related to obtaining customer contracts. ASU 2014-09, as amended, will be effective as of the beginning of fiscal 2019, including interim periods within that reporting period. The Company plans to adopt the standard using the full retrospective method to restate each prior reporting period presented. The Company is continuing to assess the impact of adopting ASU 2014-09 on its financial position, results of operations and related disclosures and has concluded that the impact to the opening balance sheet as of February 1, 2016, due to the adjustment of revenues, is not material. The Company has not yet determined whether the impact on revenues will be material for the adjusted statements of operations or for future periods. Additionally, as the Company continues to assess the new standard along with industry trends and additional interpretive guidance, the Company may adjust its implementation plan accordingly. The Company believes that the new standard will impact the following policies and disclosures: • removal of the current limitation on contingent revenue will result in revenue being recognized earlier for certain contracts; • allocation of subscription and support revenue across different clouds and to professional services revenue; • estimation of variable consideration for arrangements with overage fees; • required disclosures including information about the remaining transaction price and when the Company expects to recognize revenue; and • accounting for deferred commissions including costs that qualify for deferral and the amortization period. The commission accounting under the new standard is significantly different than the Company's current commission capitalization policy, as it will require the Company to capitalize more costs and amortize them over a longer period of time. Under the Company's current policy, the Company only capitalizes commissions that have a direct relationship to a specific revenue contract and the cost is deemed to be incremental. Under the new standard, the concept of what must be capitalized is significantly broader since a direct relationship with a revenue contract is not required. Accordingly, the new standard will result in additional types of costs being capitalized, including fringe benefits and taxes. Additionally, all amounts capitalized will be amortized over a period longer than the Company's current policy of amortizing the deferred amounts over the specific revenue contract terms, which are typically 12 to 36 months. Specifically, initial incremental contract costs will be deferred and amortized over an estimated customer life of four years, which is calculated based on both qualitative and quantitative factors, such as product life cycles and customer attrition. While the Company has not yet finalized its assessment of the impact the new commission accounting policy will have on its financial position and results of operations, the Company believes it will be material to both its balance sheet and statement of operations due to the capitalization of additional costs and the longer period of amortization. The Company does not expect the adoption of ASU 2014-09 to have any impact on its operating cash flows. In January 2016, the FASB issued Accounting Standards Update No. 2016-01, "Financial Instrument-Overall (Subtopic 825-10)" ("ASU 2016-01"), which requires entities to measure equity instruments at fair value and recognize any changes in fair value in other income (expense) within the statement of operations. Under the new standard, the Company will record its publicly traded equity investments at fair value on a quarterly basis and record the change in other income (expense) within the statement of operations. Previously, such adjustments were recorded in other comprehensive income. The guidance provides for electing the measurement alternative or defaulting to the fair value option for equity investments that do not have readily determinable fair values. The Company plans to elect the measurement alternative for its equity investments in privately held companies. These investments will be measured at cost, less any impairment, plus or minus adjustments resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer, which are recorded in other income (expense) within the statement of operations. The new standard is effective as of the beginning of fiscal 2019, including interim periods within that reporting period, on a prospective basis for nonmarketable equity securities and a modified retrospective basis for publicly held equity investments. The Company expects the adoption of ASU 2016-01 will impact its strategic investments portfolio, which consists of approximately $100.3 million in publicly traded equity investments and $516.6 million in privately held equity investments, as of October 31, 2017 , both of which are recorded in strategic investments within the balance sheet. Refer to Note 2, "Investments," for additional details. The new standard could have a material impact to the Company's consolidated financial statements, including additional volatility to other income (expense) within the Company's statements of operations in future periods, due to changes in market prices of the Company's investments in publicly held equity investments and the valuation and timing of same or similar transactions of the Company's investments in privately held equity investments. In October 2016, the FASB issued Accounting Standards Update No. 2016-16, "Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory" ("ASU 2016-16"), which requires entities to recognize the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The new standard is effective for annual periods beginning after December 15, 2017, with early adoption permitted as of the beginning of a fiscal year. The Company plans to adopt the new standard in its first quarter of fiscal 2019 and does not expect it to have a material impact on its consolidated financial statements. In February 2016, the FASB issued Accounting Standards Update No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"), which requires lessees to record most leases on their balance sheets but recognize the expenses on their statements of operations in a manner similar to current accounting rules. ASU 2016-02 states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The new standard is effective for interim and annual periods beginning after December 15, 2018 on a modified retrospective basis. The Company is in the process of implementing changes to its systems, processes and controls, in conjunction with its review of existing lease agreements, in order to adopt the new standard in its first quarter of fiscal 2020. The Company expects its leases designated as operating leases in Note 13, “Commitments,” will be reported on the consolidated balance sheets upon adoption. The Company is currently evaluating the impact to its consolidated financial statements as it relates to other aspects of the business.
Reclassifications	Reclassifications Certain reclassifications to fiscal 2017 balances were made to conform to the current period presentation in the consolidated balance sheets, consolidated statement of operations and consolidated statements of cash flows. These reclassifications include cost of revenues-subscription and support, cost of revenues-professional services and other, deferred revenue, deferred revenue, noncurrent, and purchases and sales of strategic investments.

Summary of Business and Signi24

Summary of Business and Significant Accounting Policies (Tables)	9 Months Ended
	Oct. 31, 2017
Accounting Policies [Abstract]
Revenues By Geographical Region	Revenues by geographical region are as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Americas $ 1,927,405 $ 1,598,344 $ 5,536,932 $ 4,506,774 Europe 493,732 337,497 1,367,718 1,012,671 Asia Pacific 258,704 208,934 724,359 578,551 $ 2,679,841 $ 2,144,775 $ 7,629,009 $ 6,097,996
Schedule Of Property And Equipment Estimated Useful Lives	Property and equipment are stated at cost. Depreciation is calculated on a straight-line basis over the estimated useful lives of those assets as follows: Computers, equipment and software 3 to 9 years Furniture and fixtures 5 years Leasehold improvements Shorter of the estimated lease term or 10 years Building and structural components Average weighted useful life of 32 years Building - leased facility 27 years Building improvements 10 years

Investments (Tables)

Investments (Tables)	9 Months Ended
	Oct. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of Marketable Securities	At October 31, 2017 , marketable securities consisted of the following (in thousands): Investments classified as Marketable Securities Amortized Cost Unrealized Gains Unrealized Losses Fair Value Corporate notes and obligations $ 939,959 $ 2,246 $ (2,435 ) $ 939,770 U.S. treasury securities 137,172 29 (491 ) 136,710 Mortgage backed obligations 98,226 22 (532 ) 97,716 Asset backed securities 202,180 96 (219 ) 202,057 Municipal securities 56,387 81 (201 ) 56,267 Foreign government obligations 68,845 2 (524 ) 68,323 U.S. agency obligations 10,506 1 (9 ) 10,498 Covered bonds 45,485 63 (61 ) 45,487 Total marketable securities $ 1,558,760 $ 2,540 $ (4,472 ) $ 1,556,828 At January 31, 2017 , marketable securities consisted of the following (in thousands): Investments classified as Marketable Securities Amortized Cost Unrealized Gains Unrealized Losses Fair Value Corporate notes and obligations $ 321,284 $ 887 $ (1,531 ) $ 320,640 U.S. treasury securities 62,429 68 (674 ) 61,823 Mortgage backed obligations 74,882 39 (669 ) 74,252 Asset backed securities 101,913 74 (197 ) 101,790 Municipal securities 33,523 35 (183 ) 33,375 Foreign government obligations 10,491 3 (36 ) 10,458 Total marketable securities $ 604,522 $ 1,106 $ (3,290 ) $ 602,338
Schedule of Short-Term and Long-Term Marketable Securities	The contractual maturities of the investments classified as marketable securities are as follows (in thousands): As of October 31, January 31, Due within 1 year $ 226,929 $ 104,631 Due in 1 year through 5 years 1,314,352 494,127 Due in 5 years through 10 years 15,547 3,580 $ 1,556,828 $ 602,338
Schedule of Marketable Securities in a Unrealized Loss Position	As of October 31, 2017 , the following marketable securities were in an unrealized loss position (in thousands): Less than 12 Months 12 Months or Greater Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Corporate notes and obligations $ 424,101 $ (2,052 ) $ 28,653 $ (383 ) $ 452,754 $ (2,435 ) U.S. treasury securities 114,724 (491 ) 0 0 114,724 (491 ) Mortgage backed obligations 68,841 (315 ) 16,564 (217 ) 85,405 (532 ) Asset backed securities 126,186 (210 ) 3,461 (9 ) 129,647 (219 ) Municipal securities 30,671 (148 ) 2,788 (53 ) 33,459 (201 ) Foreign government obligations 62,697 (520 ) 1,027 (4 ) 63,724 (524 ) U.S. agency obligations 6,746 (9 ) 0 0 6,746 (9 ) Covered bonds 5,861 (61 ) 0 0 5,861 (61 ) $ 839,827 $ (3,806 ) $ 52,493 $ (666 ) $ 892,320 $ (4,472 )
Schedule of Components of Investment Income	The components of investment income are presented below (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Interest income $ 10,038 $ 3,642 $ 24,433 $ 17,961 Realized gains 258 210 770 7,771 Realized losses (247 ) (143 ) (1,134 ) (1,985 ) Total investment income $ 10,049 $ 3,709 $ 24,069 $ 23,747

Derivatives (Tables)

Derivatives (Tables)	9 Months Ended
	Oct. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Outstanding Foreign Currency Derivative Contracts Related Primarily to Intercompany Receivables and Payables	Details on outstanding foreign currency derivative contracts are presented below (in thousands): As of October 31, 2017 January 31, 2017 Notional amount of foreign currency derivative contracts $ 1,275,276 $ 1,280,953 Fair value of foreign currency derivative contracts $ 853 $ 10,205
Fair Value of Outstanding Derivative Instruments	The fair value of the Company’s outstanding derivative instruments not designated as hedging instruments are summarized below (in thousands): As of Balance Sheet Location October 31, 2017 January 31, 2017 Derivative Assets Foreign currency derivative contracts Prepaid expenses and other current assets $ 4,225 $ 13,238 Derivative Liabilities Foreign currency derivative contracts Accounts payable, accrued expenses and other liabilities $ 3,372 $ 3,033
Schedule of The Effect of The Derivative Instruments Not Designated as Hedging Instruments on the Condensed Consolidated Statements of Operations	Gains/losses on derivative instruments not designated as hedging instruments recorded in Other income (expense) in the consolidated statements of operations during the three and nine months ended October 31, 2017 and 2016 , respectively, are summarized below (in thousands): Three Months Ended Nine Months Ended 2017 2016 2017 2016 Foreign currency derivative contracts $ (1,606 ) $ (39,624 ) $ 11,500 $ (86,528 )

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	9 Months Ended
	Oct. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value an a Recurring Basis	The following table presents information about the Company’s assets and liabilities that are measured at fair value as of October 31, 2017 and indicates the fair value hierarchy of the valuation (in thousands): Description Quoted Prices in Significant Other Significant Balances as of October 31, 2017 Cash equivalents (1): Time deposits $ 0 $ 394,123 $ 0 $ 394,123 Money market mutual funds 805,554 0 0 805,554 Marketable securities: Corporate notes and obligations 0 939,770 0 939,770 U.S. treasury securities 0 136,710 0 136,710 Mortgage backed obligations 0 97,716 0 97,716 Asset backed securities 0 202,057 0 202,057 Municipal securities 0 56,267 0 56,267 Foreign government obligations 0 68,323 0 68,323 U.S. agency obligations 0 10,498 0 10,498 Covered bonds 0 45,487 0 45,487 Foreign currency derivative contracts (2) 0 4,225 0 4,225 Total assets $ 805,554 $ 1,955,176 $ 0 $ 2,760,730 Liabilities: Foreign currency derivative contracts (3) 0 3,372 0 3,372 Total liabilities $ 0 $ 3,372 $ 0 $ 3,372 ___________ (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheet as of October 31, 2017 , in addition to $872.2 million of cash. (2) Included in “prepaid expenses and other current assets” in the accompanying consolidated balance sheet as of October 31, 2017 . (3) Included in “accounts payable, accrued expenses and other liabilities” in the accompanying consolidated balance sheet as of October 31, 2017 . The following table presents information about the Company’s assets and liabilities that are measured at fair value as of January 31, 2017 and indicates the fair value hierarchy of the valuation (in thousands): Description Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Balances as of January 31, 2017 Cash equivalents (1): Time deposits $ 0 $ 25,100 $ 0 $ 25,100 Money market mutual funds 956,479 0 0 956,479 Marketable securities: Corporate notes and obligations 0 320,640 0 320,640 U.S. treasury securities 0 61,823 0 61,823 Mortgage backed obligations 0 74,252 0 74,252 Asset backed securities 0 101,790 0 101,790 Municipal securities 0 33,375 0 33,375 Foreign government obligations 0 10,458 0 10,458 Foreign currency derivative contracts (2) 0 13,238 0 13,238 Total assets $ 956,479 $ 640,676 $ 0 $ 1,597,155 Liabilities: Foreign currency derivative contracts (3) 0 3,033 0 3,033 Total liabilities $ 0 $ 3,033 $ 0 $ 3,033 ______________ (1) Included in “cash and cash equivalents” in the accompanying consolidated balance sheet as of January 31, 2017 , in addition to $625.0 million of cash. (2) Included in “prepaid expenses and other current assets” in the accompanying consolidated balance sheet as of January 31, 2017 . (3) Included in “accounts payable, accrued expenses and other liabilities” in the accompanying consolidated balance sheet as of January 31, 2017 .

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Oct. 31, 2017
Property, Plant and Equipment [Abstract]
Schedule of Property And Equipment	Property and equipment, net consisted of the following (in thousands): As of October 31, 2017 January 31, 2017 Land $ 183,888 $ 183,888 Buildings and building improvements 626,168 621,377 Computers, equipment and software 1,600,783 1,440,986 Furniture and fixtures 132,374 112,564 Leasehold improvements 776,396 627,069 3,319,609 2,985,884 Less accumulated depreciation and amortization (1,454,718 ) (1,198,350 ) $ 1,864,891 $ 1,787,534

Intangible Assets Acquired Th29

Intangible Assets Acquired Through Business Combinations and Goodwill (Tables)	9 Months Ended
	Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets Acquired From Business Combinations	Intangible assets acquired through business combinations are as follows (in thousands): Intangible Assets, Gross Accumulated Amortization Intangible Assets, Net Weighted Jan 31, 2017 Additions Oct. 31, 2017 Jan 31, 2017 Expense Oct. 31, 2017 Jan 31, 2017 Oct. 31, 2017 Acquired developed technology $ 1,092,161 $ 0 $ 1,092,161 $ (577,929 ) $ (125,886 ) $ (703,815 ) $ 514,232 $ 388,346 3.0 Customer relationships 843,614 1,690 845,304 (254,035 ) (89,769 ) (343,804 ) 589,579 501,500 4.7 Trade names and trademarks 45,950 0 45,950 (41,349 ) (1,530 ) (42,879 ) 4,601 3,071 1.6 Territory rights and other 15,786 0 15,786 (12,256 ) (996 ) (13,252 ) 3,530 2,534 8.3 50 Fremont lease intangibles 7,713 0 7,713 (6,281 ) (1,115 ) (7,396 ) 1,432 317 0.3 Total $ 2,005,224 $ 1,690 $ 2,006,914 $ (891,850 ) $ (219,296 ) $ (1,111,146 ) $ 1,113,374 $ 895,768 3.9
Expected Future Amortization Expense for Purchased Intangible Assets	The expected future amortization expense for intangible assets as of October 31, 2017 is as follows (in thousands): Fiscal Period: Remaining three months of Fiscal 2018 $ 69,053 Fiscal 2019 266,233 Fiscal 2020 225,039 Fiscal 2021 169,481 Fiscal 2022 111,353 Thereafter 54,609 Total amortization expense $ 895,768
Schedule of Goodwill	The changes in the carrying amounts of goodwill, which is generally not deductible for tax purposes, were as follows (in thousands): Balance as of January 31, 2017 $ 7,263,846 Sequence, Inc. acquisition 22,982 Adjustments of acquisition date fair values, including the effect of foreign currency translation 7,313 Balance as of October 31, 2017 $ 7,294,141

Debt (Tables)

Debt (Tables)	9 Months Ended
	Oct. 31, 2017
Debt Disclosure [Abstract]
Summary of Convertible Senior Notes	Certain terms of the conversion features of the 0.25% Senior Notes are as follows: Conversion Rate per $1,000 Par Value Initial Conversion Price per Share Convertible Date 0.25% Senior Notes 15.0512 $ 66.44 January 1, 2018 Convertible Senior Notes Par Value Outstanding Equity Component Recorded at Issuance Liability Component of Par Value as of (in thousands) October 31, January 31, 0.25% Convertible Senior Notes due April 1, 2018 $ 1,149,979 $ 122,421 (1) $ 1,137,954 $ 1,116,360 ___________ (1) This amount represents the equity component recorded at the initial issuance of the 0.25% convertible senior notes. As of October 31, 2017 , $10.8 million was reclassified to temporary equity on the accompanying consolidated balance sheet as these notes are convertible for the three months ending October 31, 2017 based on the conversion criteria below.
Schedule of Convertible Senior Notes	The 0.25% Senior Notes consisted of the following (in thousands): As of October 31, January 31, Liability component: Principal (1) $ 1,149,979 $ 1,150,000 Less: debt discount, net (2) (10,797 ) (29,954 ) Less: debt issuance cost (1,228 ) (3,686 ) Net carrying amount $ 1,137,954 $ 1,116,360 (1) The effective interest rate of the 0.25% Senior Notes is 2.53% . The interest rate is based on the interest rates of similar liabilities at the time of issuance that did not have an associated convertible feature. (2) Included in the consolidated balance sheets within Convertible 0.25% Senior Notes (which is classified as a current liability as of October 31, 2017 and a noncurrent liability as of January 31, 2017) and is amortized over the life of the 0.25% Senior Notes using the effective interest rate method.
Summary of Hedge Notes	To minimize the impact of potential economic dilution upon conversion of the Notes, the Company entered into convertible note hedge transactions with respect to its common stock (“ 0.25% Note Hedges”). (in thousands, except for shares) Date Purchase Shares 0.25% Note Hedges March 2013 $ 153,800 17,308,880
Components of Warrants	Warrants Date Proceeds (in thousands) Shares Strike Price 0.25% Warrants March 2013 $ 84,800 17,308,880 $ 90.40
Schedule of Interest Expense	The following table sets forth total interest expense recognized related to the 0.25% Senior Notes, the Term Loan, the Credit Facility and the Loan (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Contractual interest expense $ 5,766 $ 5,207 $ 17,044 $ 11,398 Amortization of debt issuance costs 1,332 1,342 3,996 4,071 Amortization of debt discount 6,463 6,304 19,269 18,794 $ 13,561 $ 12,853 $ 40,309 $ 34,263

Other Balance Sheet Accounts (T

Other Balance Sheet Accounts (Tables)	9 Months Ended
	Oct. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consisted of the following (in thousands): As of October 31, January 31, Prepaid income taxes $ 43,301 $ 26,932 Other taxes receivable 33,099 34,177 Prepaid expenses and other current assets 393,546 218,418 $ 469,946 $ 279,527
Schedule of Other Assets	Other assets consisted of the following (in thousands): As of October 31, January 31, Deferred income taxes, noncurrent, net $ 31,596 $ 28,939 Long-term deposits 23,979 23,597 Domain names and patents, net 26,811 39,213 Customer contract assets (1) 201,357 281,733 Other 141,145 113,387 $ 424,888 $ 486,869 (1) Customer contract asset reflects the fair value of future billings of amounts that are contractually committed by acquired companies' existing customers as of the acquisition date.
Schedule of Accrued Expenses and Other Current Liabilities	Accounts payable, accrued expenses and other liabilities consisted of the following (in thousands): As of October 31, January 31, Accounts payable $ 120,019 $ 115,257 Accrued compensation 622,419 730,390 Non-cash equity liability (1) 49,435 68,355 Accrued other liabilities 488,071 419,299 Accrued income and other taxes payable 193,693 239,699 Accrued professional costs 44,757 38,254 Accrued rent 33,968 19,710 Capital lease obligation, current 114,147 102,106 Financing obligation - leased facility, current 19,899 19,594 $ 1,686,408 $ 1,752,664 (1) Non-cash equity liability represents the purchase price of shares issued to non-executive employees, for those shares exceeding previously registered ESPP shares at the time of sale to the extent the shares had not been subsequently sold by the employee purchaser. The Company expects this liability will be relieved in the fourth quarter of fiscal 2018.
Schedule of Other Noncurrent Liabilities	Other noncurrent liabilities consisted of the following (in thousands): As of October 31, January 31, Deferred income taxes and income taxes payable $ 117,193 $ 99,378 Financing obligation - leased facility 198,903 200,711 Long-term lease liabilities and other 420,774 480,850 $ 736,870 $ 780,939

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Oct. 31, 2017
Equity [Abstract]
Schedule Of Assumptions Used To Calculate Fair Value Of Options Granted	The fair value of each stock option grant was estimated on the date of grant using the Black-Scholes option pricing model with the following assumptions and fair value per share: Three Months Ended Nine Months Ended Stock Options 2017 2016 2017 2016 Volatility 30.8 % 32.3 % 30.8 - 31.4 % 32.1 - 32.3 % Estimated life 3.5 years 3.5 years 3.5 years 3.5 years Risk-free interest rate 1.6 - 1.8 % 0.9 - 1.1 % 1.4 - 1.8 % 0.9 - 1.1 % Weighted-average fair value per share of grants $ 24.12 $ 18.75 $ 22.26 $ 18.75
Schedule Of Stock Activity	Stock activity excluding the ESPP is as follows: Options Outstanding Shares Available for Grant Outstanding Stock Options Weighted- Average Exercise Price Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2017 16,531,822 30,353,076 $ 59.88 Increase in shares authorized: 2013 Equity Incentive Plan 37,009,109 0 0.00 2014 Inducement Plan 16,198 0 0.00 Options granted under all plans (1,020,046 ) 1,020,046 89.01 Restricted stock activity (2,696,029 ) 0 0.00 Stock grants to board and advisory board members (163,596 ) 0 0.00 Exercised 0 (6,705,729 ) 43.57 Plan shares expired (44,309 ) 0 0.00 Canceled 1,314,229 (1,314,229 ) 71.92 Balance as of October 31, 2017 50,947,378 23,353,164 $ 65.16 $ 868,266 Vested or expected to vest 21,891,255 $ 64.58 $ 826,607 Exercisable as of October 31, 2017 10,090,058 $ 57.62 $ 451,210
Schedule Of Stock Options Outstanding	The following table summarizes information about stock options outstanding as of October 31, 2017 : Options Outstanding Options Exercisable Range of Exercise Prices Number Outstanding Weighted- Average Remaining Contractual Life (Years) Weighted- Average Exercise Price Number of Shares Weighted- Average Exercise Price $0.86 to $52.30 4,540,787 4.4 $ 35.63 3,693,473 $ 41.41 $53.60 to $58.86 724,916 3.8 55.57 478,771 55.61 $59.34 4,826,489 4.1 59.34 3,309,418 59.34 $59.37 to $75.01 1,553,021 5.2 69.76 500,029 70.21 $75.57 5,576,546 6.0 75.57 0 0.00 $76.48 to $80.62 577,049 5.6 78.54 175,146 78.59 $80.99 to $98.90 5,554,356 5.3 82.48 1,933,221 80.99 23,353,164 5.0 $ 65.16 10,090,058 $ 57.62
Schedule Of Restricted Stock Activity	Restricted stock activity is as follows: Restricted Stock Outstanding Outstanding Weighted- Average Exercise Price Aggregate Intrinsic Value (in thousands) Balance as of January 31, 2017 27,453,498 $ 0.001 Granted - restricted stock units and awards 2,844,391 0.001 Canceled (1,606,148 ) 0.001 Vested and converted to shares (6,105,427 ) 0.001 Balance as of October 31, 2017 22,586,314 $ 0.001 $ 2,311,483 Expected to vest 19,722,393 $ 2,018,390
Schedule Of Shares Of Common Stock Available For Future Issuance Under Stock Option Plans	The following number of shares of common stock were reserved and available for future issuance at October 31, 2017 : Options outstanding 23,353,164 Restricted stock awards and units and performance stock units outstanding 22,586,314 Stock available for future grant: 2013 Equity Incentive Plan 50,316,168 2014 Inducement Plan 520,478 Amended and Restated 2004 Employee Stock Purchase Plan 9,629,807 Acquired equity plans 110,732 Convertible Senior Notes 17,308,564 Warrants 17,308,880 141,134,107

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Oct. 31, 2017
Earnings Per Share [Abstract]
Reconciliation of Denominator Used In Calculation of Basic And Diluted Loss Per Share	A reconciliation of the denominator used in the calculation of basic and diluted earnings per share is as follows (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Numerator: Net income (loss) $ 51,394 $ (37,309 ) $ 59,923 $ 231,072 Denominator: Weighted-average shares outstanding for basic earnings (loss) per share 717,445 690,468 711,884 683,075 Effect of dilutive securities: Convertible senior notes 5,162 0 4,571 1,994 Employee stock awards 14,717 0 13,235 11,188 Warrants 782 0 522 0 Adjusted weighted-average shares outstanding and assumed conversions for diluted earnings (loss) per share 738,106 690,468 730,212 696,257
Shares Excluded From Diluted Earnings Or Loss Per Share	The weighted-average number of shares outstanding used in the computation of diluted earnings per share does not include the effect of the following potential outstanding common stock. The effects of these potentially outstanding shares were not included in the calculation of diluted earnings per share because the effect would have been anti-dilutive (in thousands): Three Months Ended October 31, Nine Months Ended October 31, 2017 2016 2017 2016 Employee stock awards 1,355 17,946 9,239 8,640 Convertible senior notes 0 17,309 0 0 Warrants 0 17,309 0 17,309

Commitments (Tables)

Commitments (Tables)	9 Months Ended
	Oct. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule Of Future Minimum Lease Payments Under Non-Cancelable Operating And Capital Leases	As of October 31, 2017 , the future minimum lease payments under non-cancelable operating and capital leases are as follows (in thousands): Capital Operating Financing Obligation -Leased Facility (1) Fiscal Period: Remaining three months of Fiscal 2018 $ 22,974 $ 152,711 $ 5,433 Fiscal 2019 115,830 575,237 21,881 Fiscal 2020 201,616 503,390 22,325 Fiscal 2021 73 368,148 22,770 Fiscal 2022 37 282,804 23,214 Thereafter 3 1,408,213 210,713 Total minimum lease payments 340,533 $ 3,290,503 $ 306,336 Less: amount representing interest (23,384 ) Present value of capital lease obligations $ 317,149 ______________ (1) Total Financing Obligation - Leased Facility noted above represents the total obligation on the lease agreement including amounts allocated to interest and the implied lease for the land as noted in Note 5 “Property and Equipment.” As of October 31, 2017 , $218.8 million of the total $306.3 million above was recorded to Financing obligation leased facility, of which the current portion is included in "Accounts payable, accrued expenses and other liabilities" and the noncurrent portion is included in “Other noncurrent liabilities” on the consolidated balance sheets.

Summary of Business and Signi35

Summary of Business and Significant Accounting Policies - Additional Information (Detail)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 31, 2017USD ($)	Oct. 31, 2016USD ($)	Oct. 31, 2017USD ($)segment	Oct. 31, 2016USD ($)	Jan. 31, 2017USD ($)	Mar. 31, 2013
Summary of Business and Significant Accounting Policies [Line Items]
Number of operating segments | segment			1
Deferred commissions	$ (171,562,000)	$ (92,803,000)	$ (372,714,000)	$ (226,965,000)
Amortization of deferred commissions	117,677,000	93,230,000	331,687,000	270,527,000
Deferred commissions	580,600,000		$ 580,600,000		$ 539,600,000
Offering period			12 months
Percentage of tax benefit likely to be realized upon settlement (greater than 50%)			50.00%
Impairment of long-lived assets	0	$ 0	$ 0	$ 0
Strategic Investments
Summary of Business and Significant Accounting Policies [Line Items]
Non-marketable debt and equity securities	570,100,000		570,100,000		526,000,000
Private Equity Funds
Summary of Business and Significant Accounting Policies [Line Items]
Non-marketable debt and equity securities	516,600,000		516,600,000
Equity Securities | Strategic Investments
Summary of Business and Significant Accounting Policies [Line Items]
Fair value of marketable equity securities	$ 100,300,000		$ 100,300,000		$ 41,000,000
Stock options and restricted stock
Summary of Business and Significant Accounting Policies [Line Items]
Vesting period			4 years
Performance shares
Summary of Business and Significant Accounting Policies [Line Items]
Vesting period			3 years
Restricted stock units and awards
Summary of Business and Significant Accounting Policies [Line Items]
Vesting period			4 years
Award requisite service period			4 years
Revenue | Geographic Concentration Risk | Americas
Summary of Business and Significant Accounting Policies [Line Items]
Concentration risk percentage	96.00%	96.00%	96.00%	96.00%
Assets | Geographic Concentration Risk | Outside Americas
Summary of Business and Significant Accounting Policies [Line Items]
Concentration risk percentage			13.00%		12.00%
Assets | Geographic Concentration Risk | Americas
Summary of Business and Significant Accounting Policies [Line Items]
Concentration risk percentage			86.00%		86.00%
Minimum
Summary of Business and Significant Accounting Policies [Line Items]
Deferred and amortized commission period			12 months
Maximum
Summary of Business and Significant Accounting Policies [Line Items]
Deferred and amortized commission period			36 months
Convertible Debt | 0.25% Convertible Senior Notes due April 1, 2018
Summary of Business and Significant Accounting Policies [Line Items]
Contractual interest rate	0.25%		0.25%			0.25%

Summary of Business and Signi36

Summary of Business and Significant Accounting Policies - Revenues by Geographical Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 2,679,841	$ 2,144,775	$ 7,629,009	$ 6,097,996
Reportable Geographical Components | Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,927,405	1,598,344	5,536,932	4,506,774
Reportable Geographical Components | Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	493,732	337,497	1,367,718	1,012,671
Reportable Geographical Components | Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 258,704	$ 208,934	$ 724,359	$ 578,551

Summary of Business and Signi37

Summary of Business and Significant Accounting Policies - Schedule of Property and Equipment Estimated Useful Lives (Detail)	9 Months Ended
	Oct. 31, 2017
Building and structural components
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	32 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years
Building - leased facility
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	27 years
Building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years
Minimum | Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Minimum | Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum | Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	9 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years
Maximum | Internal-use software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years

Investments - Schedule of Marke

Investments - Schedule of Marketable Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 1,558,760	$ 604,522
Unrealized Gains	2,540	1,106
Unrealized Losses	(4,472)	(3,290)
Fair Value	1,556,828	602,338
Corporate notes and obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	939,959	321,284
Unrealized Gains	2,246	887
Unrealized Losses	(2,435)	(1,531)
Fair Value	939,770	320,640
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	137,172	62,429
Unrealized Gains	29	68
Unrealized Losses	(491)	(674)
Fair Value	136,710	61,823
Mortgage backed obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	98,226	74,882
Unrealized Gains	22	39
Unrealized Losses	(532)	(669)
Fair Value	97,716	74,252
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	202,180	101,913
Unrealized Gains	96	74
Unrealized Losses	(219)	(197)
Fair Value	202,057	101,790
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	56,387	33,523
Unrealized Gains	81	35
Unrealized Losses	(201)	(183)
Fair Value	56,267	33,375
Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68,845	10,491
Unrealized Gains	2	3
Unrealized Losses	(524)	(36)
Fair Value	68,323	$ 10,458
U.S. agency obligations
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,506
Unrealized Gains	1
Unrealized Losses	(9)
Fair Value	10,498
Covered bonds
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	45,485
Unrealized Gains	63
Unrealized Losses	(61)
Fair Value	$ 45,487

Investments - Schedule of Short

Investments - Schedule of Short-Term and Long-Term Marketable Securities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Due within 1 year	$ 226,929	$ 104,631
Due in 1 year through 5 years	1,314,352	494,127
Due in 5 years through 10 years	15,547	3,580
Fair Value of Marketable Securities	$ 1,556,828	$ 602,338

Investments - Schedule of Mar40

Investments - Schedule of Marketable Securities in Unrealized Loss Position (Detail) $ in Thousands	Oct. 31, 2017USD ($)
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	$ 839,827
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(3,806)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	52,493
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(666)
Marketable securities in an unrealized loss position, Fair Value	892,320
Marketable securities in an unrealized loss position, Unrealized Losses	(4,472)
Corporate notes and obligations
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	424,101
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(2,052)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	28,653
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(383)
Marketable securities in an unrealized loss position, Fair Value	452,754
Marketable securities in an unrealized loss position, Unrealized Losses	(2,435)
U.S. treasury securities
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	114,724
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(491)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	0
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	0
Marketable securities in an unrealized loss position, Fair Value	114,724
Marketable securities in an unrealized loss position, Unrealized Losses	(491)
Mortgage backed obligations
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	68,841
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(315)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	16,564
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(217)
Marketable securities in an unrealized loss position, Fair Value	85,405
Marketable securities in an unrealized loss position, Unrealized Losses	(532)
Asset backed securities
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	126,186
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(210)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	3,461
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(9)
Marketable securities in an unrealized loss position, Fair Value	129,647
Marketable securities in an unrealized loss position, Unrealized Losses	(219)
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	30,671
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(148)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	2,788
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(53)
Marketable securities in an unrealized loss position, Fair Value	33,459
Marketable securities in an unrealized loss position, Unrealized Losses	(201)
Foreign government obligations
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	62,697
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(520)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	1,027
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	(4)
Marketable securities in an unrealized loss position, Fair Value	63,724
Marketable securities in an unrealized loss position, Unrealized Losses	(524)
U.S. agency obligations
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	6,746
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(9)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	0
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	0
Marketable securities in an unrealized loss position, Fair Value	6,746
Marketable securities in an unrealized loss position, Unrealized Losses	(9)
Covered bonds
Schedule of Available-for-sale Securities [Line Items]
Marketable securities in an unrealized loss position for less than 12 months, Fair Value	5,861
Marketable securities in an unrealized loss position for less than 12 months, Unrealized Losses	(61)
Marketable securities in an unrealized loss position for more than 12 months, Fair Value	0
Marketable securities in an unrealized loss position for more than 12 months, Unrealized Losses	0
Marketable securities in an unrealized loss position, Fair Value	5,861
Marketable securities in an unrealized loss position, Unrealized Losses	$ (61)

Investments - Additional Inform

Investments - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Oct. 31, 2016USD ($)	Oct. 31, 2017USD ($)investment	Jan. 31, 2017USD ($)investment
Investment Holdings [Line Items]
Unrealized losses on fixed rate investments, upper range value		$ 0.2
Equity Securities
Investment Holdings [Line Items]
Realized gain on securities	$ 15.5
Strategic Investments
Investment Holdings [Line Items]
Number of investments in marketable equity securities | investment		3	6
Unrealized gain on marketable equity securities		$ 62	$ 24.5
Non-marketable debt and equity securities		570.1	526
Strategic Investments | Cost Approach Valuation Technique
Investment Holdings [Line Items]
Non-marketable debt and equity securities, estimated fair value		803.9	758.3
Strategic Investments | Equity Securities
Investment Holdings [Line Items]
Fair value of marketable equity securities		$ 100.3	$ 41

Investments - Schedule of Compo

Investments - Schedule of Components of Investment Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Interest income	$ 10,038	$ 3,642	$ 24,433	$ 17,961
Realized gains	258	210	770	7,771
Realized losses	(247)	(143)	(1,134)	(1,985)
Total investment income	$ 10,049	$ 3,709	$ 24,069	$ 23,747

Derivatives - Schedule of Outst

Derivatives - Schedule of Outstanding Foreign Currency Derivative Contracts Related Primarily to Intercompany Receivables and Payables (Detail) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Derivative [Line Items]
Fair value of foreign currency derivative contracts	$ 853	$ 10,205
Foreign currency derivative contracts
Derivative [Line Items]
Notional amount of foreign currency derivative contracts	$ 1,275,276	$ 1,280,953

Derivatives - Fair Value of Out

Derivatives - Fair Value of Outstanding Derivative Instruments (Detail) - Derivatives not designated as hedging instruments - Foreign currency derivative contracts - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 4,225	$ 13,238
Accounts payable, accrued expenses and other liabilities
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ 3,372	$ 3,033

Derivatives - Effect of Derivat

Derivatives - Effect of Derivative Instruments Not Designated as Hedging Instruments on Condensed Consolidated Statements of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Derivatives not designated as hedging instruments | Foreign currency derivative contracts | Other income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on Derivative Instruments Recognized in Income	$ (1,606)	$ (39,624)	$ 11,500	$ (86,528)

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Cash
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 872,200	$ 625,000
Recurring measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	2,760,730	1,597,155
Total liabilities	3,372	3,033
Recurring measurement | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	805,554	956,479
Total liabilities	0	0
Recurring measurement | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	1,955,176	640,676
Total liabilities	3,372	3,033
Recurring measurement | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Total liabilities	0	0
Recurring measurement | Prepaid expenses and other current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	4,225	13,238
Recurring measurement | Prepaid expenses and other current assets | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	0	0
Recurring measurement | Prepaid expenses and other current assets | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	4,225	13,238
Recurring measurement | Prepaid expenses and other current assets | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	0	0
Recurring measurement | Accounts payable, accrued expenses and other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	3,372	3,033
Recurring measurement | Accounts payable, accrued expenses and other liabilities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	0	0
Recurring measurement | Accounts payable, accrued expenses and other liabilities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	3,372	3,033
Recurring measurement | Accounts payable, accrued expenses and other liabilities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency derivative contracts	0	0
Recurring measurement | Time deposits | Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	394,123	25,100
Recurring measurement | Time deposits | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Recurring measurement | Time deposits | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	394,123	25,100
Recurring measurement | Time deposits | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Recurring measurement | Money market mutual funds | Cash and cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	805,554	956,479
Recurring measurement | Money market mutual funds | Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	805,554	956,479
Recurring measurement | Money market mutual funds | Cash and cash equivalents | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Recurring measurement | Money market mutual funds | Cash and cash equivalents | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Recurring measurement | Corporate notes and obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	939,770	320,640
Recurring measurement | Corporate notes and obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Corporate notes and obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	939,770	320,640
Recurring measurement | Corporate notes and obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	136,710	61,823
Recurring measurement | U.S. treasury securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | U.S. treasury securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	136,710	61,823
Recurring measurement | U.S. treasury securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Mortgage backed obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	97,716	74,252
Recurring measurement | Mortgage backed obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Mortgage backed obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	97,716	74,252
Recurring measurement | Mortgage backed obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	202,057	101,790
Recurring measurement | Asset backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Asset backed securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	202,057	101,790
Recurring measurement | Asset backed securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	56,267	33,375
Recurring measurement | Municipal securities | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Municipal securities | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	56,267	33,375
Recurring measurement | Municipal securities | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Foreign government obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	68,323	10,458
Recurring measurement | Foreign government obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Recurring measurement | Foreign government obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	68,323	10,458
Recurring measurement | Foreign government obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	$ 0
Recurring measurement | U.S. agency obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	10,498
Recurring measurement | U.S. agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Recurring measurement | U.S. agency obligations | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	10,498
Recurring measurement | U.S. agency obligations | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Recurring measurement | Covered bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	45,487
Recurring measurement | Covered bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0
Recurring measurement | Covered bonds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	45,487
Recurring measurement | Covered bonds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 0

Property and Equipment (Detail)

Property and Equipment (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 3,319,609	$ 2,985,884
Less accumulated depreciation and amortization	(1,454,718)	(1,198,350)
Property and equipment, net	1,864,891	1,787,534
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	183,888	183,888
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	626,168	621,377
Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,600,783	1,440,986
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	132,374	112,564
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 776,396	$ 627,069

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) ft² in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017USD ($)	Oct. 31, 2016USD ($)	Oct. 31, 2017USD ($)	Oct. 31, 2016USD ($)	Jan. 31, 2017USD ($)	Dec. 31, 2013ft²
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 94,200	$ 83,500	$ 277,200	$ 239,200
Fixed assets acquired under capital lease agreements	729,500		729,500		$ 729,000
Net rentable area (in square feet) | ft²						445
Property and equipment, gross	3,319,609		3,319,609		2,985,884
Financing obligation - leased facility, current	19,899		19,899		19,594
Financing obligation - leased facility	198,903		198,903		200,711
Expected financing obligation	306,336		306,336
Computers, equipment and software
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	450,500		450,500		386,900
Property and equipment, gross	1,600,783		1,600,783		1,440,986
Construction costs capitalized
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 178,800		$ 178,800		$ 178,800

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Business Acquisition [Line Items]
Business combinations, net of cash acquired		$ 0	$ 32,117	$ 19,781	$ 2,832,110
Goodwill		$ 7,294,141		$ 7,294,141		$ 7,263,846
Sequence, Inc.
Business Acquisition [Line Items]
Business combinations, net of cash acquired	$ 26,000
Intangible assets	2,700
Goodwill	$ 23,000

Intangible Assets Acquired Th50

Intangible Assets Acquired Through Business Combinations and Goodwill (Intangible Assets Acquired From Business Combinations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	$ 2,006,914		$ 2,006,914		$ 2,005,224
Additions			1,690
Accumulated Amortization	(1,111,146)		(1,111,146)		(891,850)
Expense			(219,296)
Total amortization expense	895,768		$ 895,768		1,113,374
Weighted Average Useful Life			3 years 10 months 24 days
Amortization of unfavorable lease liabilities	70,000	$ 65,300	$ 219,100	$ 153,000
Acquired developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	1,092,161		1,092,161		1,092,161
Additions			0
Accumulated Amortization	(703,815)		(703,815)		(577,929)
Expense			(125,886)
Total amortization expense	388,346		$ 388,346		514,232
Weighted Average Useful Life			3 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	845,304		$ 845,304		843,614
Additions			1,690
Accumulated Amortization	(343,804)		(343,804)		(254,035)
Expense			(89,769)
Total amortization expense	501,500		$ 501,500		589,579
Weighted Average Useful Life			4 years 8 months 12 days
Trade names and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	45,950		$ 45,950		45,950
Additions			0
Accumulated Amortization	(42,879)		(42,879)		(41,349)
Expense			(1,530)
Total amortization expense	3,071		$ 3,071		4,601
Weighted Average Useful Life			1 year 7 months 6 days
Territory rights and other
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	15,786		$ 15,786		15,786
Additions			0
Accumulated Amortization	(13,252)		(13,252)		(12,256)
Expense			(996)
Total amortization expense	2,534		$ 2,534		3,530
Weighted Average Useful Life			8 years 3 months 18 days
50 Fremont lease intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross	7,713		$ 7,713		7,713
Additions			0
Accumulated Amortization	(7,396)		(7,396)		(6,281)
Expense			(1,115)
Total amortization expense	$ 317		$ 317		$ 1,432
Weighted Average Useful Life			3 months 18 days

Intangible Assets Acquired Th51

Intangible Assets Acquired Through Business Combinations and Goodwill (Expected Future Amortization Expense for Purchased Intangible Assets) (Details) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining three months of Fiscal 2018	$ 69,053
Fiscal 2,019	266,233
Fiscal 2,020	225,039
Fiscal 2,021	169,481
Fiscal 2,022	111,353
Thereafter	54,609
Total amortization expense	$ 895,768	$ 1,113,374

Intangible Assets Acquired Th52

Intangible Assets Acquired Through Business Combinations and Goodwill (Goodwill) (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2017USD ($)
Goodwill [Roll Forward]
Goodwill beginning balance	$ 7,263,846
Adjustments of acquisition date fair values, including the effect of foreign currency translation	7,313
Goodwill ending balance	7,294,141
Sequence, Inc. acquisition
Goodwill [Roll Forward]
Sequence, Inc. acquisition	$ 22,982

Debt - Summary of Convertible S

Debt - Summary of Convertible Senior Notes (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017	Mar. 31, 2013
Debt Conversion [Line Items]
Convertible 0.25% senior notes, net	$ 0	$ 1,116,360
Convertible 0.25% senior notes (See Note 8)	10,797	0
Convertible Debt | 0.25% Convertible Senior Notes due April 1, 2018
Debt Conversion [Line Items]
Par Value Outstanding	1,149,979
Equity Component Recorded at Issuance	122,421
Convertible 0.25% senior notes, net	$ 1,137,954	$ 1,116,360
Contractual interest rate	0.25%		0.25%

Debt - Additional Information (

Debt - Additional Information (Detail)	1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 28, 2017USD ($)	Jul. 31, 2016	Oct. 31, 2017USD ($)$ / shares	Oct. 31, 2016USD ($)	Oct. 31, 2017USD ($)d$ / shares	Oct. 31, 2016USD ($)	Nov. 22, 2017USD ($)	Jan. 31, 2017USD ($)	Mar. 31, 2013USD ($)
Debt Instrument [Line Items]
Amount outstanding			$ 0		$ 0
Debt interest expense			$ 13,561,000	$ 12,853,000	$ 40,309,000	$ 34,263,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 1,000,000,000		$ 1,000,000,000
Debt default interest rate above applicable interest rate for overdue principal				2.00%		2.00%
Debt default interest rate above applicable interest rate for base rate loans and other				2.00%		2.00%
Pay down of debt	$ 200,000,000
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee percentage		0.125%
Revolving Credit Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Revolving Credit Facility | Minimum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee percentage		0.25%
Revolving Credit Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Revolving Credit Facility | Maximum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Convertible Debt | 0.25% Convertible Senior Notes due April 1, 2018
Debt Instrument [Line Items]
Face amount of debt									$ 1,150,000,000
Contractual interest rate			0.25%		0.25%				0.25%
Consecutive trading days threshold | d					20
Consecutive trading days threshold, total					30 days
Stock price trigger					130.00%
Notes price trigger					98.00%
Purchase price upon fundamental change			100.00%		100.00%
Estimated fair value of Company's senior notes			$ 1,800,000,000		$ 1,800,000,000
Fair value debt basis amount			$ 100		$ 100
Closing prices of Company's common stock (in dollars per share) | $ / shares			$ 102.34		$ 102.34
If-converted value in excess of principal					$ 621,400,000
Principal			$ 1,149,979,000		$ 1,149,979,000			$ 1,150,000,000
Convertible Debt | 0.25% Convertible Senior Notes due April 1, 2018 | Subsequent Event
Debt Instrument [Line Items]
Principal balance with conversion notices							$ 26,700,000
Notes Payable to Banks | 0.25% Convertible Senior Notes due April 1, 2018
Debt Instrument [Line Items]
Contractual interest rate			0.25%		0.25%			0.25%
Notes Payable to Banks | Term Loan Credit Agreement
Debt Instrument [Line Items]
Face amount of debt			$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 500,000,000
Weighted average interest rate			2.20%		2.20%
Accrued interest					$ 300,000
Debt default interest rate above applicable interest rate for overdue principal				2.00%		2.00%
Debt default interest rate above applicable interest rate for base rate loans and other				2.00%		2.00%
Notes Payable to Banks | Term Loan Credit Agreement | Minimum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Notes Payable to Banks | Term Loan Credit Agreement | Minimum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Notes Payable to Banks | Term Loan Credit Agreement | Maximum | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.75%
Notes Payable to Banks | Term Loan Credit Agreement | Maximum | Adjusted LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		1.75%
Mortgage Loan | 50 Fremont Street
Debt Instrument [Line Items]
Contractual interest rate			3.75%		3.75%
Loan assumed on 50 Fremont					$ 200,000,000
Debt interest expense			$ 1,800,000	$ 1,800,000	$ 5,600,000	$ 5,600,000

Debt - Schedule of Conversion o

Debt - Schedule of Conversion of Senior Notes to Common Stock (Detail) - Convertible Debt - 0.25% Convertible Senior Notes due April 1, 2018	9 Months Ended
	Oct. 31, 2017$ / shares
Debt Instrument [Line Items]
Conversion Rate per $1,000 Par Value	0.0150512
Initial Conversion Price per Share	$ 66.44

Debt - Schedule of Convertible

Debt - Schedule of Convertible Senior Notes (Detail) - Convertible Debt - 0.25% Convertible Senior Notes due April 1, 2018 - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017	Mar. 31, 2013
Debt Instrument [Line Items]
Principal	$ 1,149,979	$ 1,150,000
Less: debt discount, net	(10,797)	(29,954)
Less: debt issuance cost	(1,228)	(3,686)
Net carrying amount	$ 1,137,954	$ 1,116,360
Contractual interest rate	0.25%		0.25%
Effective interest rates of Senior Notes	2.53%

Debt - Summary of Hedge Notes (

Debt - Summary of Hedge Notes (Detail) - Convertible Debt - 0.25% Note Hedges $ in Thousands	9 Months Ended
	Oct. 31, 2017USD ($)shares
Derivatives, Fair Value [Line Items]
Purchase | $	$ 153,800
Shares (in shares) | shares	17,308,880

Debt - Components of Warrants (

Debt - Components of Warrants (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Oct. 31, 2017USD ($)$ / sharesshares
Class of Warrant or Right [Line Items]
Warrants (in shares)	17,308,880
Convertible Debt | 0.25% Warrants
Class of Warrant or Right [Line Items]
Proceeds | $	$ 84,800
Warrants (in shares)	17,308,880
Strike Price (in dollars per share) | $ / shares	$ 90.40

Debt - Schedule of Interest Exp

Debt - Schedule of Interest Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Debt Disclosure [Abstract]
Contractual interest expense	$ 5,766	$ 5,207	$ 17,044	$ 11,398
Amortization of debt issuance costs	1,332	1,342	3,996	4,071
Amortization of debt discount	6,463	6,304	19,269	18,794
Debt interest expense	$ 13,561	$ 12,853	$ 40,309	$ 34,263

Other Balance Sheet Accounts -

Other Balance Sheet Accounts - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Prepaid income taxes	$ 43,301	$ 26,932
Other taxes receivable	33,099	34,177
Prepaid expenses and other current assets	393,546	218,418
Prepaid expenses and other current assets	$ 469,946	$ 279,527

Other Balance Sheet Accounts 61

Other Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Capitalized software, net	$ 140,768		$ 140,768		$ 141,671
Capitalized software,accumulated amortization	306,600		306,600		$ 250,900
Amortization of acquired intangible assets			219,296
Acquired intellectual property
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	4,300	$ 4,100	13,000	$ 11,900
Capitalized internal-use software development costs
Finite-Lived Intangible Assets [Line Items]
Capitalized software amortization expense	18,700	16,600	55,700	47,500
Capitalized stock based compensation	$ 2,000	$ 1,700	$ 5,900	$ 5,100

Other Balance Sheet Accounts 62

Other Balance Sheet Accounts - Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Deferred income taxes, noncurrent, net	$ 31,596	$ 28,939
Long-term deposits	23,979	23,597
Domain names and patents, net	895,768	1,113,374
Customer contract assets	201,357	281,733
Other	141,145	113,387
Other assets, net	424,888	486,869
Domain names and patents, net
Finite-Lived Intangible Assets [Line Items]
Domain names and patents, net	$ 26,811	$ 39,213

Other Balance Sheet Accounts 63

Other Balance Sheet Accounts - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Accounts payable	$ 120,019	$ 115,257
Accrued compensation	622,419	730,390
Non-cash equity liability	49,435	68,355
Accrued other liabilities	488,071	419,299
Accrued income and other taxes payable	193,693	239,699
Accrued professional costs	44,757	38,254
Accrued rent	33,968	19,710
Capital lease obligation, current	114,147	102,106
Financing obligation - leased facility, current	19,899	19,594
Accrued expenses and other current liabilities	$ 1,686,408	$ 1,752,664

Other Balance Sheet Accounts 64

Other Balance Sheet Accounts - Schedule of Other Non current Liabilities (Detail) - USD ($) $ in Thousands	Oct. 31, 2017	Jan. 31, 2017
Balance Sheet Related Disclosures [Abstract]
Deferred income taxes and income taxes payable	$ 117,193	$ 99,378
Financing obligation - leased facility	198,903	200,711
Long-term lease liabilities and other	420,774	480,850
Other noncurrent liabilities	$ 736,870	$ 780,939

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Millions	Jan. 31, 2006	Jul. 31, 2017$ / shares	Jul. 31, 2016$ / shares	Oct. 31, 2017USD ($)purchase_period$ / sharesshares	Oct. 31, 2016USD ($)$ / shares	Oct. 31, 2017USD ($)purchase_period$ / sharesshares	Jul. 31, 2013	Jan. 31, 2017$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of purchase periods | purchase_period				2		2
Weighted-average grant date fair value of awards granted (in dollars per share) | $ / shares				$ 89.04	$ 76.90
Expected dividend yield				0.00%
Total intrinsic value of the options exercised during the period				$ 298.7	$ 176.2
Weighted-average remaining contractual life of vested and expected to vest options (in years)				5 years
Options vested (in shares) | shares				10,090,058		10,090,058
Weighted average exercise price vested (in dollars per share) | $ / shares				$ 57.62		$ 57.62
Weighted-average contractual life of vested and expected to vest options (in years)				4 years
Intrinsic value of vested options				$ 451.2		$ 451.2
Weighted-average exercise price (in dollars per share) | $ / shares				$ 0.001		$ 0.001
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual life of stock options (in years)	10 years					7 years	5 years
Share-based compensation expense				$ 759.3
Compensation not yet recognized, stock options				2,000		$ 2,000
Amortization, remaining of fiscal year				234.5		234.5
Amortization, year two				777.8		777.8
Amortization, year three				574.4		574.4
Amortization, year four				303.6		303.6
Amortization, year five				42.9		42.9
Amortization, thereafter				$ 25.2		$ 25.2
Period for recognition				1 year 10 months 24 days
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				3 years
Performance shares | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				0.00%
Performance shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				200.00%
Restricted stock units and awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period				4 years
Weighted-average exercise price (in dollars per share) | $ / shares				$ 0.001		$ 0.001		$ 0.001
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amount withheld on behalf of employees for future purchases				$ 119.2		$ 119.2
Weighted-average grant date fair value of awards granted (in dollars per share) | $ / shares		$ 21.13	$ 21.93

Stockholders' Equity - Fair Val

Stockholders' Equity - Fair Value Assumptions (Detail) - Stock Options - $ / shares	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	30.80%	32.30%
Volatility, minimum			30.80%	32.10%
Volatility, maximum			31.40%	32.30%
Estimated life	3 years 6 months	3 years 6 months	3 years 6 months	3 years 6 months
Risk-free interest rate, minimum	1.60%	0.90%	1.40%	0.90%
Risk-free interest rate, maximum	1.80%	1.10%	1.80%	1.10%
Weighted-average fair value per share of grants (in dollars per share)	$ 24.12	$ 18.75	$ 22.26	$ 18.75

Stockholders' Equity - Stock Ac

Stockholders' Equity - Stock Activity (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Oct. 31, 2017USD ($)$ / sharesshares
Shares available for grant
Shares Available for Grant, Balance (in shares)	16,531,822
Shares Available for Grant, Options granted under all plans (in shares)	(1,020,046)
Shares Available for Grant, Exercised (in shares)	0
Shares Available for Grant, Expired (in shares)	(44,309)
Shares Available for Grant, Canceled (in shares)	1,314,229
Shares Available for Grant, Balance (in shares)	50,947,378
Outstanding Stock Options
Outstanding Stock Options, Balance (in shares)	30,353,076
Outstanding Stock Options (in shares)	1,020,046
Outstanding Stock Options, Exercised (in shares)	(6,705,729)
Outstanding Stock Options, Plan shares expired (in shares)	0
Outstanding Stock Options, Canceled (in shares)	(1,314,229)
Outstanding Stock Options, Balance (in shares)	23,353,164
Outstanding Stock Options, Vested or expected to vest (in shares)	21,891,255
Outstanding Stock Options, Exercisable (in shares)	10,090,058
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Balance (in dollars per share) | $ / shares	$ 59.88
Weighted- Average Exercise Price, Options (in dollars per share) | $ / shares	89.01
Weighted- Average Exercise Price, Exercised (in dollars per share) | $ / shares	43.57
Weighted- Average Exercise Price, Expired (in dollars per share) | $ / shares	0
Weighted- Average Exercise Price, Canceled (in dollars per share) | $ / shares	71.92
Weighted- Average Exercise Price, Balance (in dollars per share) | $ / shares	65.16
Weighted- Average Exercise Price, Vested or expected to vest (in dollars per share) | $ / shares	64.58
Weighted- Average Exercise Price, Exercisable (in dollars per share) | $ / shares	$ 57.62
Aggregate Intrinsic Value
Weighted- Average Exercise Price, Balance | $	$ 868,266
Weighted- Average Exercise Price, Vested or expected to vest | $	826,607
Weighted- Average Exercise Price, Exercisable | $	$ 451,210
Restricted stock units and awards
Shares available for grant
Shares Available for Grant, Restricted stock activity (in shares)	(2,696,029)
Outstanding Stock Options
Outstanding Stock Options (in shares)	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options (in dollars per share) | $ / shares	$ 0
Stock grants to board and advisory board members
Shares available for grant
Shares Available for Grant, Stock grants to board and advisory board members (in shares)	(163,596)
Outstanding Stock Options
Outstanding Stock Options (in shares)	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options (in dollars per share) | $ / shares	$ 0
2013 Equity Incentive Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized (in shares)	37,009,109
Shares Available for Grant, Balance (in shares)	50,316,168
Outstanding Stock Options
Outstanding Stock Options, Increase in shares authorized (in shares)	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options (in dollars per share) | $ / shares	$ 0
2014 Inducement Plan
Shares available for grant
Shares Available for Grant, Increase in shares authorized (in shares)	16,198
Shares Available for Grant, Balance (in shares)	520,478
Outstanding Stock Options
Outstanding Stock Options, Increase in shares authorized (in shares)	0
Options Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Options (in dollars per share) | $ / shares	$ 0

Stockholders' Equity - Stock Op

Stockholders' Equity - Stock Options Outstanding (Detail)	9 Months Ended
	Oct. 31, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Number Outstanding (in shares) | shares	23,353,164
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	5 years
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 65.16
Options Exercisable, Number of Shares (in shares) | shares	10,090,058
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 57.62
$0.86 to $52.30
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	0.86
Range of Exercise Prices, Maximum (in dollars per share)	$ 52.30
Options, Number Outstanding (in shares) | shares	4,540,787
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	4 years 4 months 24 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 35.63
Options Exercisable, Number of Shares (in shares) | shares	3,693,473
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 41.41
$53.60 to $58.86
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	53.60
Range of Exercise Prices, Maximum (in dollars per share)	$ 58.86
Options, Number Outstanding (in shares) | shares	724,916
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	3 years 9 months 18 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 55.57
Options Exercisable, Number of Shares (in shares) | shares	478,771
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 55.61
$ 59.34
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	59.34
Range of Exercise Prices, Maximum (in dollars per share)	$ 59.34
Options, Number Outstanding (in shares) | shares	4,826,489
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	4 years 1 month 6 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 59.34
Options Exercisable, Number of Shares (in shares) | shares	3,309,418
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 59.34
$59.37 to $75.01
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	59.37
Range of Exercise Prices, Maximum (in dollars per share)	$ 75.01
Options, Number Outstanding (in shares) | shares	1,553,021
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	5 years 2 months 12 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 69.76
Options Exercisable, Number of Shares (in shares) | shares	500,029
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 70.21
$ 75.57
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	75.57
Range of Exercise Prices, Maximum (in dollars per share)	$ 75.57
Options, Number Outstanding (in shares) | shares	5,576,546
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	6 years
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 75.57
Options Exercisable, Number of Shares (in shares) | shares	0
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0
$76.48 to $80.62
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	76.48
Range of Exercise Prices, Maximum (in dollars per share)	$ 80.62
Options, Number Outstanding (in shares) | shares	577,049
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	5 years 7 months 6 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 78.54
Options Exercisable, Number of Shares (in shares) | shares	175,146
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 78.59
$80.99 to $98.90
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices, Minimum (in dollars per share)	80.99
Range of Exercise Prices, Maximum (in dollars per share)	$ 98.90
Options, Number Outstanding (in shares) | shares	5,554,356
Weighted- Average Remaining Contractual Life (Years), Options Outstanding	5 years 3 months 18 days
Weighted- Average Exercise Price, Options Outstanding (in dollars per share)	$ 82.48
Options Exercisable, Number of Shares (in shares) | shares	1,933,221
Options Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 80.99

Stockholders' Equity - Schedule

Stockholders' Equity - Schedule of Restricted Stock Activity (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Oct. 31, 2017USD ($)$ / sharesshares
Restricted Stock Outstanding
Ending Balance (in shares)	22,586,314
Restricted Stock Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Restricted Stock Outstanding, Balance (in dollars per share) | $ / shares	$ 0.001
Restricted stock units and awards
Restricted Stock Outstanding
Beginning Balance (in shares)	27,453,498
Granted, Outstanding (in shares)	2,844,391
Canceled, Outstanding (in shares)	(1,606,148)
Vested and converted to shares, Outstanding (in shares)	(6,105,427)
Ending Balance (in shares)	22,586,314
Expected to vest, Outstanding (in shares)	19,722,393
Restricted Stock Outstanding Weighted-Average Exercise Price
Weighted- Average Exercise Price, Restricted Stock Outstanding, Balance (in dollars per share) | $ / shares	$ 0.001
Weighted- Average Exercise Price, Restricted Stock Outstanding, Granted (in dollars per share) | $ / shares	0.001
Weighted- Average Exercise Price, Restricted Stock Outstanding, Canceled (in dollars per share) | $ / shares	0.001
Weighted- Average Exercise Price, Restricted Stock Outstanding, Vested and converted to shares (in dollars per share) | $ / shares	0.001
Weighted- Average Exercise Price, Restricted Stock Outstanding, Balance (in dollars per share) | $ / shares	$ 0.001
Restricted Stock Outstanding Aggregate Intrinsic Value
Aggregate Intrinsic Value, Ending Balance | $	$ 2,311,483
Aggregate Intrinsic Value, Expected to vest | $	$ 2,018,390

Stockholders' Equity - Shares o

Stockholders' Equity - Shares of Common Stock Available for Future Issuance under Stock Option Plans (Detail) - shares	Oct. 31, 2017	Jan. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	23,353,164	30,353,076
Restricted stock awards and units outstanding (in shares)	22,586,314
Stock available for future grant (in shares)	50,947,378	16,531,822
Convertible senior notes (in shares)	17,308,563.9248
Warrants (in shares)	17,308,880
Total shares available for future grant (in shares)	141,134,107
2013 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for future grant (in shares)	50,316,168
2014 Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for future grant (in shares)	520,478
Amended and Restated 2004 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for future grant (in shares)	9,629,807
Acquired equity plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock available for future grant (in shares)	110,732

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Income Tax Disclosure [Abstract]
Provision (benefit) for income taxes	$ 55,007	$ 24,723	$ 53,968	$ (182,220)
Pretax income (loss)	106,401	$ (12,586)	$ 113,891	$ 48,852
Effective (negative) tax rate			(47.00%)	373.00%
Discrete tax benefit from partial release of valuation allowance				$ 205,600
Income tax benefit recognized from stock compensation expense			$ 206,800	$ 161,400
Reasonably possible decrease of unrecognized tax benefits	$ 6,800		$ 6,800

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Denominator Used in Calculation of Basic and Diluted Loss Per Share (Detail) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 51,394	$ (37,309)	$ 59,923	$ 231,072
Weighted-average shares outstanding for basic earnings (loss) per share (in shares)	717,445	690,468	711,884	683,075
Convertible senior notes (in shares)	5,162	0	4,571	1,994
Employee stock awards (in shares)	14,717	0	13,235	11,188
Warrants (in shares)	782	0	522	0
Adjusted weighted-average shares outstanding and assumed conversions for diluted earnings (loss) per share (in shares)	738,106	690,468	730,212	696,257

Earnings Per Share - Shares Exc

Earnings Per Share - Shares Excluded from Diluted Earnings or Loss Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Employee stock awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded	1,355	17,946	9,239	8,640
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded	0	17,309	0	0
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded	0	17,309	0	17,309

Commitments - Additional Inform

Commitments - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	Apr. 30, 2016	Oct. 31, 2017	Jan. 31, 2017
Other Commitments [Line Items]
Financing obligation - leased facility		$ 198,903	$ 200,711
Expected financing obligation		306,336
Operating lease commitment		3,290,503
Purchase commitment term	4 years
Payment for purchase commitment		96,000
Purchase commitment, 2019		108,000
Purchase commitment, 2020		126,000
Other Current and Noncurrent Liabilities
Other Commitments [Line Items]
Financing obligation - leased facility		218,800
Letter of Credit
Other Commitments [Line Items]
Value of outstanding letters of credit		96,600
Facilities Space
Other Commitments [Line Items]
Total operating lease commitment balance		$ 2,700,000

Commitments - Schedule of Futur

Commitments - Schedule of Future Minimum Lease Payments under Non-Cancelable Operating and Capital Leases (Detail) $ in Thousands	Oct. 31, 2017USD ($)
Capital Leases
Remaining three months of Fiscal 2018	$ 22,974
Fiscal 2,019	115,830
Fiscal 2,020	201,616
Fiscal 2,021	73
Fiscal 2,022	37
Thereafter	3
Total minimum lease payments	340,533
Less: amount representing interest	(23,384)
Present value of capital lease obligations	317,149
Operating Leases
Remaining three months of Fiscal 2018	152,711
Fiscal 2,019	575,237
Fiscal 2,020	503,390
Fiscal 2,021	368,148
Fiscal 2,022	282,804
Thereafter	1,408,213
Total minimum lease payments	3,290,503
Financing Obligation -Leased Facility
Remaining three months of Fiscal 2018	5,433
Fiscal 2,019	21,881
Fiscal 2,020	22,325
Fiscal 2,021	22,770
Fiscal 2,022	23,214
Thereafter	210,713
Total minimum lease payments	$ 306,336

Legal Proceedings and Claims (D

Legal Proceedings and Claims (Details) $ in Millions	3 Months Ended
	Oct. 31, 2017USD ($)
ExactTarget, Inc. Class-Action Lawsuit
Loss Contingencies [Line Items]
Litigation settlement amount	$ 6.3

Related-Party Transactions (Det

Related-Party Transactions (Details) - Affiliated Entity $ in Millions	9 Months Ended
	Oct. 31, 2017USD ($)board_memberboard_seatemployee
Related Party Transaction [Line Items]
Number of Company's Board Members that Hold Board Seats in Foundation	1
Number of Board Seats in Foundation	3
Number of Company's Employees that Hold Board Seats in Non-Profit | employee	1
Number Company's Board Members that Hold Board Seats in Non-Profit | board_member	1
Number of Board Seats in Non-Profit Held by Company's Employees and Board Members	3
Number of Board Seats in Non-Profit	9
Value of resources donated to related parties | $	$ 7.4
Value of donated subscriptions to related parties | $	$ 129.7