CASH AND CASH EQUIVALENTS, INVESTMENTS, AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 31, 2026	Jul. 31, 2025	Jul. 31, 2026	Jul. 31, 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 securities, available-for-Sale, continuous unrealized loss Position, 12 months or longer	$ 0		$ 0
Debt and equity securities					$ 104,227,000
Long-term investments	157,998,000		157,998,000		140,898,000
Gain on investments			5,058,000	$ (3,000)
Asset impairment charges			502,000	2,176,000
Forward Contracts
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Derivative instruments not designated as hedging instruments, gain (loss) recognized	(6,300,000)		200,000
Derivative instruments not designated as hedging instruments, gain (loss) realized through cash settlements	(4,900,000)
Unrealized foreign currency gains (losses)	4,700,000		(2,700,000)
Forward Contracts | Not Designated as Hedging Instrument
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Notional value	162,500,000		162,500,000
Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Gain on investments	500,000	$ 800,000	7,300,000	800,000
Asset impairment charges	0	$ 0	0	$ 0
Level 3 | Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Debt and equity securities	155,200,000		155,200,000		$ 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		$ 100,000,000.0