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Investments - Equity Investments (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Jan. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |
Marketable equity investments | $ 88,571 | $ 551,804
Equity investments | 29,405 | 28,005
Marketable and Non-Marketable Equity Investments | $ 117,976 | $ 579,809

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- Definition For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(b)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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