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