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Financial Instruments - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2020
Derivatives, Fair Value [Line Items] |  |  |
Securities in continuous unrealized loss position for greater than twelve months | $ 0 | $ 0 |
Allowance for credit loss | 0 | 0 |
Securities, writeoff | 0 | 0 |
Available-for-sale securities gross gains (losses) | 0 | 600,000 | $ 0
Proceeds from sale and maturity of marketable securities | 37,800,000 | 17,000,000 | 27,400,000
Non-marketable equity securities investments without readily determinable fair value | 133,700,000 | 134,100,000 |
Equity method investment, realized gain (loss) on disposal | 8,100,000 | 0 | 0
Derivative, notional amount | 1,080,000,000.00 | 1,140,000,000 |
Interest rate cash flow hedge gain (loss) to be reclassified during next 24 months | 24,200,000 |  |
Other financing activities | (7,300,000) | (2,500,000) | $ (4,400,000)
Aoci including portion attributable to noncontrolling interest, period increase (decrease) | 900,000 |  |
Interest Rate Contract |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Other financing activities | 4,000,000 |  |
Foreign Exchange Contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative, notional amount | $ 542,200,000 | $ 434,500,000 |

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