Cash and Cash Equivalents, Investments, and Fair Value Measurements - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 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	$ 600,000	$ 600,000		$ 600,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer	294,500,000	294,500,000		294,500,000
Debt and equity securities	393,133,000	393,133,000		393,133,000		$ 188,069,000
Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Unrealized gain (loss) on investments		0	$ 0	0	$ 0
Realized investment gains (losses)		300,000	$ 2,000,000
Level 3 | Strategic Investments
Fair Value Assets and Liabilities Measure On Recurring And Nonrecurring Basis [Line Items]
Debt and equity securities	22,700,000	22,700,000		22,700,000		16,100,000
Receivables related to strategic investments	$ 1,400,000	$ 1,400,000		$ 1,400,000		$ 1,100,000