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Common Stock and Stockholders' Equity - Narrative (Details) $ in Thousands | 12 Months Ended
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Jan. 31, 2020 USD ($) vote shares | Jan. 31, 2019 USD ($) shares | Jan. 31, 2018 USD ($) shares
Class of Stock [Line Items] |  |  |  |  |
Non-cash charitable contributions | $ 1,746 | $ 1,008 | [1] | $ 708 | [1]
Class A Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | vote | 1 |  |  |  |
Class A Common Stock | Contribution of Nonmonetary Assets to Charitable Organization |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of common stock pursuant to charitable donation (in shares) | shares | 15,000 | 20,000 |  |  |
Non-cash charitable contributions | $ 1,700 | $ 1,000 |  |  |
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of votes per share | vote | 10 |  |  |  |
Class B Common Stock | Contribution of Nonmonetary Assets to Charitable Organization |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Issuance of common stock pursuant to charitable donation (in shares) | shares |  |  |  | 24,287 |
Non-cash charitable contributions |  |  |  | $ 700 |
[1] | Adjusted for adoption of ASC 842. See Note 2.

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- Definition Noncash charitable contributions made by the entity during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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