Description of Business and Basis of Presentation - Schedule of Adjustments made to Account on Condensed Consolidated Balance Sheet as a Result of Applying Retrospective Method (Details) - USD ($) $ in Thousands		Jul. 31, 2018	Feb. 01, 2018	Jan. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]	$ 114,779		$ 162,133
Deferred commissions		16,855		17,589
Deferred commissions, non-current		44,059		8,330	[2]
Deferred revenue		281,765		291,902
Deferred revenue, non-current		19,752		29,021
Accumulated deficit		$ (1,074,008)		$ (1,039,088)
Accounting Standards Update 2014-09
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]		$ 162,715
Deferred commissions			14,140
Deferred commissions, non-current	[2]		41,185
Deferred revenue			283,419
Deferred revenue, non-current			27,690
Accumulated deficit			(999,286)
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Revenue Recognition
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Accounts receivable	[1]		582
Deferred revenue			(8,483)
Deferred revenue, non-current			(1,331)
Accumulated deficit			10,396
Accounting Standards Update 2014-09 | Effect of Adoption of ASU Topic 606 | Incremental Costs of Obtaining a Contract
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Deferred commissions			(3,449)
Deferred commissions, non-current	[2]		32,855
Accumulated deficit			$ 29,406

[1] Contract assets are reported as part of accounts receivable upon the adoption of ASC Topic 606.

[2] As of January 31, 2018, deferred commissions, non-current was reported as part of other long-term assets. The condensed consolidated balance sheet as of January 31, 2018 was reclassified to conform to the current period presentation.