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Fair Value Measurements - Schedule of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 31, 2023	Apr. 30, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022	Jan. 31, 2023
Short-term investments:
Investment in non-marketable equity securities	$ 13,100			$ 13,100		$ 9,800
Equity securities without readily determinable fair value, upward price adjustment, annual amount	0		$ 0	1,300	$ 1,700
Non-marketable Securities
Short-term investments:
Payments to acquire investments				2,100	$ 2,700
Fair Value, Recurring
Short-term investments:
Total financial assets	1,691,743			1,691,743		1,649,789
Level 1 | Fair Value, Recurring
Short-term investments:
Total financial assets	1,691,743			1,691,743		1,649,789
Level 2 | Fair Value, Recurring
Short-term investments:
Total financial assets	0			0		0
Level 3 | Fair Value, Recurring
Short-term investments:
Total financial assets	0			0		0
U.S. government treasury securities
Short-term investments:
Unrealized losses on US treasury stock		$ 2,422		10,031
U.S. government treasury securities | Fair Value, Recurring
Short-term investments:
Short-term investments:	1,447,036			1,447,036		1,380,804
U.S. government treasury securities | Level 1 | Fair Value, Recurring
Short-term investments:
Short-term investments:	1,447,036			1,447,036		1,380,804
U.S. government treasury securities | Level 2 | Fair Value, Recurring
Short-term investments:
Short-term investments:	0			0		0
U.S. government treasury securities | Level 3 | Fair Value, Recurring
Short-term investments:
Short-term investments:	0			0		0
Money market funds | Fair Value, Recurring
Cash and cash equivalents:
Cash and cash equivalents:	244,707			244,707		268,985
Money market funds | Level 1 | Fair Value, Recurring
Cash and cash equivalents:
Cash and cash equivalents:	244,707			244,707		268,985
Money market funds | Level 2 | Fair Value, Recurring
Cash and cash equivalents:
Cash and cash equivalents:	0			0		0
Money market funds | Level 3 | Fair Value, Recurring
Cash and cash equivalents:
Cash and cash equivalents:	$ 0			$ 0		$ 0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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