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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jan. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 733,202	$ 632,786
Gross Unrealized Gains	214	535
Gross Unrealized Losses	(475)	(407)
Estimated Fair Value	732,941	632,914
Cash	320,400	464,700
Level 2 | Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	461,836	448,901
Gross Unrealized Gains	214	535
Gross Unrealized Losses	(475)	(407)
Estimated Fair Value	461,575	449,029
Money market funds | Level 1 | Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	271,366	183,885
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	271,366	183,885
Commercial paper | Level 2 | Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	8,243
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Estimated Fair Value	8,242
Commercial paper | Level 2 | Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	25,077	31,367
Gross Unrealized Gains	0	12
Gross Unrealized Losses	(22)	(8)
Estimated Fair Value	25,055	31,371
Corporate notes and bonds | Level 2 | Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	390,516	399,034
Gross Unrealized Gains	213	522
Gross Unrealized Losses	(399)	(378)
Estimated Fair Value	390,330	399,178
U.S. governmental securities | Level 2 | Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	38,000	18,500
Gross Unrealized Gains	1	1
Gross Unrealized Losses	(53)	(21)
Estimated Fair Value	$ 37,948	$ 18,480

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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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