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Description of Business and Basis of Presentation - Additional Information (Details)		3 Months Ended		12 Months Ended
	Nov. 29, 2017 USD ($)	Apr. 30, 2018 USD ($) Customer	Apr. 30, 2017 USD ($) Customer	Jan. 31, 2018 USD ($) Customer	Jan. 31, 2017 USD ($)
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Customer contracts, estimated expected benefit period		5 years
Net cash provided by (used in) operating activities		$ 18,440,000	$ 8,541,000	$ 61,800,000	$ (1,200,000)
Release of restricted cash	$ (26,100,000)
Restricted cash		$ 350,000		350,000
Sales commission estimated period of amortization on straight-line basis		5 years
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of subscription and premier services contracts		1 year
Maximum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Period of subscription and premier services contracts		3 years
Accounting Standards Update 2016-18
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Release of restricted cash				26,400,000
Accounting Standards Update 2016-18 | Adjustment
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Net cash provided by (used in) operating activities				35,400,000	$ (2,400,000)
Release of restricted cash				$ 25,000,000
Accounting Standards Update 2016-01
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Impairment adjustment on investments		$ 0
Accounting Standards Update 2016-01 | Reported Value Measurement | Other Long-Term Assets
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investments on equity securities		$ 100,000
Credit Concentration Risk | Accounts Receivable
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer		1		1
Concentration risk percentage		10.00%		10.00%
Customer Concentration Risk | Revenue
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer		1	0
Concentration risk percentage		10.00%	10.00%
Geographic Concentration Risk | Revenue | Non-U.S.
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage		24.00%	22.00%
Geographic Concentration Risk | Revenue | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage		76.00%	78.00%
Geographic Concentration Risk | Property and Equipment | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage		93.00%		95.00%

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