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Description of Business and Basis of Presentation - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2017 USD ($) Customer	Jul. 31, 2016 Customer	Jul. 31, 2017 USD ($) Customer	Jul. 31, 2016 Customer	Jan. 31, 2017 USD ($) Customer
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Restricted cash | $	$ 26,543		$ 26,543		$ 26,781
Excess tax benefits from employee stock option exercises included in net operating loss and research and development tax credit forwards | $			$ 25,200
Credit Concentration Risk | Accounts Receivable
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of major customer | Customer	1		1		2
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	0	0	0	0
Concentration risk percentage	10.00%	10.00%	10.00%	10.00%
Geographic Concentration Risk | Revenue | Non-U.S.
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	21.00%	17.00%	21.00%	17.00%
Geographic Concentration Risk | Revenue | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	79.00%	83.00%	79.00%	83.00%
Geographic Concentration Risk | Property and Equipment | United States
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage			99.70%		99.70%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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-Publisher FASB
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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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