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Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2019
Derivatives, Fair Value [Line Items] |  |  |
Securities in continuous unrealized loss position for greater than twelve months | $ 0 | $ 0 |
Allowance for credit loss | 0 |  |
Securities, writeoff | 0 |  |
Available-for-sale securities gross gains (losses) | 600,000 | 0 | $ (1,300,000)
Proceeds from sale and maturity of marketable securities | 17,000,000.0 | 27,400,000 | $ 531,000,000.0
Non-marketable equity securities investments without readily determinable fair value | 134,100,000 | 122,500,000 |
Derivative, notional amount | 1,140,000,000 | 981,300,000 |
Net loss expected to be recognized into earnings | 24,100,000 |  |
Foreign Exchange Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, notional amount | $ 434,500,000 | $ 736,200,000 |

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- Definition Amount of allowance for credit loss on 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 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: 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 + Details
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