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Investments - Equity Investments (Details) - USD ($) $ in Thousands	Apr. 30, 2018	Jan. 31, 2018
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.

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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

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Equity Securities without Readily Determinable Fair Value, Amount

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Marketable and Non-Marketable Equity Investments

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