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Concentration of Credit Risk (Additional Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017 | Jan. 31, 2018
Concentration Risk [Line Items] |  |  |  |  |
Unsecured revolving credit facility | $ 400,000,000.0 |  | $ 400,000,000.0 |  |
Tech Data | Net Revenue |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk | 35.00% | 32.00% | 35.00% | 31.00% |
Tech Data | Accounts Receivable |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk |  |  | 23.00% |  | 31.00%

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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