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Financial Instruments (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2020 | Jul. 31, 2019 | Jan. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Securities in a continuous unrealized loss position for more than 12 months | $ 0 |  | $ 0 |  | $ 0
Allowance for credit loss | 0 |  | 0 |  |
Securities, writeoff |  |  | 0 |  |
Gain (loss) from sale or redemption of available for sale securities |  |  | 0 | $ 0 |
Proceeds from sale and maturity of marketable securities | 11,000,000 | $ 22,800,000 | 11,000,000.0 | $ 27,400,000 |
Direct investments in privately held companies | 136,200,000 |  | 136,200,000 |  | $ 122,500,000
Level 3 | Privately Held |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available-for-sale | 5,300,000 |  | 5,300,000 |  |
Amortized c non-marketable debt securities | $ 5,300,000 |  | $ 5,300,000 |  |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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