CASH AND CASH EQUIVALENTS, INVESTMENTS, AND FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023	Jan. 31, 2024
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, accumulated loss	$ 100,000		$ 100,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer	75,600,000		75,600,000
Debt and equity securities	438,971,000		438,971,000		$ 188,069,000
Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Unrealized gain (loss) on investments	0	$ 800,000	0	$ 800,000
Realized investment gains (losses)	0	$ 1,500,000	300,000	$ 3,500,000
Level 3 | Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Debt and equity securities	23,200,000		23,200,000		16,100,000
Receivables related to strategic investments	$ 1,400,000		$ 1,400,000		$ 1,100,000