Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jul. 31, 2024	Jan. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 559,184	$ 723,206
Gross Unrealized Gains	171	264
Gross Unrealized Losses	(547)	(771)
Estimated Fair Value	558,808	722,699
Cash	482,100	444,800
Level 2 \| Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	440,131	424,689
Gross Unrealized Gains	171	264
Gross Unrealized Losses	(547)	(771)
Estimated Fair Value	439,755	424,182
Money market funds \| Level 1 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	119,053	298,517
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	119,053	298,517
Commercial paper \| Level 2 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	17,933	43,845
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4)	(9)
Estimated Fair Value	17,929	43,836
Commercial paper \| Level 2 \| Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	87,595	42,958
Gross Unrealized Gains	3	2
Gross Unrealized Losses	(68)	(25)
Estimated Fair Value	87,530	42,935
Corporate notes and bonds \| Level 2 \| Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	306,644	299,166
Gross Unrealized Gains	168	262
Gross Unrealized Losses	(436)	(670)
Estimated Fair Value	306,376	298,758
U.S. governmental securities \| Level 2 \| Cash Equivalents
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost		9,968
Gross Unrealized Gains		0
Gross Unrealized Losses		(1)
Estimated Fair Value		9,967
U.S. governmental securities \| Level 2 \| Available-for-sale securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	27,959	28,752
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(39)	(66)
Estimated Fair Value	$ 27,920	$ 28,686

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
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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).

+ References

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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.

+ References

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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).

+ References

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Amount excluding accrued interest, 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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