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Concentration of Credit Risk (Additional Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018 | Jan. 31, 2019 | Dec. 31, 2018
Concentration Risk [Line Items] |  |  |  |  |  |
Unsecured revolving credit facility |  |  |  |  |  | $ 650,000,000.0
Tech Data | Net Revenue |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk (in percentage) | 35.00% | 35.00% | 35.00% | 35.00% |  |
Tech Data | Accounts Receivable |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk (in percentage) |  |  | 29.00% |  | 29.00% |
Ingram Micro | Net Revenue |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |
Concentration risk (in percentage) | 10.00% | 11.00% | 10.00% | 11.00% |  |

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