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Description of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Jan. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets | [1] | $ 203,926 |  |  | $ 203,926 |  |  |  |
Operating lease liabilities | [2] | 253,704 |  |  | 253,704 |  |  |  |
Non-current portion of operating lease liabilities | [1] | 213,369 |  |  | 213,369 |  |  |  |
Finance leases liabilities |  | 131,943 |  |  | 131,943 |  |  |  |
Non-current portion of the additional finance lease liabilities |  | 82,637 | [1] |  | 82,637 | [1] |  | $ 44,597 | [3]
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  | 206,600 |  |  | 206,600 |  |  |  |
Operating lease liabilities |  | 255,000 |  |  | 255,000 |  |  |  |
Non-current portion of operating lease liabilities |  | 218,600 |  |  | 218,600 |  |  |  |
Finance lease right-of-use assets |  | 5,200 |  |  | 5,200 |  |  |  |
Finance leases liabilities |  | 5,200 |  |  | 5,200 |  |  |  |
Non-current portion of the additional finance lease liabilities |  | $ 2,900 |  |  | $ 2,900 |  |  |  |
Credit Concentration Risk | Accounts Receivable |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Number of major customers |  |  |  |  | one |  |  | one |
Concentration risk percentage |  |  |  |  | 10.00% |  |  | 10.00% |
Customer Concentration Risk | Revenue |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Number of major customers |  | One |  | One | One |  | One |  |
Concentration risk percentage |  | 10.00% |  | 12.00% | 10.00% |  | 12.00% |  |
Geographic Concentration Risk | Revenue | United States |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 75.00% |  | 75.00% | 75.00% |  | 76.00% |  |
Geographic Concentration Risk | Revenue | Japan |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk percentage |  | 10.00% |  |  |  |  |  |  |
Geographic Concentration Risk | Property and Equipment | United States |  |  |  |  |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  | 94.00% |  |  | 91.00% |
[1] | As reported and disclosed under ASC Topic 842
[2] | Non-cancellable sublease proceeds for the remainder of the fiscal year ending January 31, 2020 and the fiscal years ending January 31, 2021, 2022, and 2023 of $1.4 million, $9.5 million, $7.1 million, and $6.1 million, respectively, are not included in the table above.
[3] | As reported and disclosed under ASC Topic 840

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