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Investments, Weighted Average Maturity, Maximum

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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Nominal or face amount used to calculate payment on derivative.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of realized and unrealized gain (loss) on investment.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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CASH AND CASH EQUIVALENTS, INVESTMENTS, AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended
	Apr. 30, 2026	Apr. 30, 2025	Jan. 31, 2026
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Investments, weighted average maturity	18 months
Investments, term	2 years
Debt and equity securities			$ 104,227,000
Long-term investments	$ 155,702,000		140,898,000
Gain on investments	5,108,000	$ (3,000)
Asset impairment charges	236,000	2,171,000
Forward Contracts
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Derivative, Loss on Derivative	6,400,000
Forward Contracts \| Not Designated as Hedging Instrument
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Derivative, Notional Amount	164,100,000
Cash settlement	4,900,000
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax	7,300,000
Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Gain on investments	6,800,000
Asset impairment charges	0	$ 0
Level 3 \| Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Debt and equity securities	152,400,000		$ 36,200,000
Level 3 \| U.S. treasury securities \| Knight JV, LLC
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Long-term investments	$ 100,000,000.0