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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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