Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Jan. 31, 2026
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gross Unrealized Gains	$ 190	$ 814
Gross Unrealized Losses	(807)	(94)
Total amortized cost	742,634	720,728
Total estimated fair value	743,251	720,008
Cash	281,400	354,100
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash equivalents, amortized cost	266,585	248,251
Cash equivalents, estimated fair value	266,585	248,251
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	476,666	471,757
Gross Unrealized Gains	190	814
Gross Unrealized Losses	(807)	(94)
Estimated Fair Value	476,049	472,477
Level 2 \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	32,384	32,611
Gross Unrealized Gains	1	7
Gross Unrealized Losses	(30)	(6)
Estimated Fair Value	32,355	32,612
Level 2 \| Corporate notes and bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	435,284	425,648
Gross Unrealized Gains	189	806
Gross Unrealized Losses	(761)	(77)
Estimated Fair Value	434,712	426,377
Level 2 \| U.S. governmental securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	8,998	13,498
Gross Unrealized Gains	0	1
Gross Unrealized Losses	(16)	(11)
Estimated Fair Value	$ 8,982	$ 13,488

Cash Equivalents And Debt Securities, Available-for-Sale, Amortized Cost

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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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Amount, before tax, of unrealized loss 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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amortized cost excluding accrued interest, after allowance for credit loss, of 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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