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Fair Value Measurements - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2025	Jan. 31, 2025
Current assets
Amortized Cost	$ 278,702	$ 281,484
Gross Unrealized Gains	1,489	793
Gross Unrealized Losses	(45)	(121)
Estimated Fair Value	280,146	282,156
U.S. Treasury securities
Current assets
Amortized Cost	157,439	155,017
Gross Unrealized Gains	855	254
Gross Unrealized Losses	(41)	(105)
Estimated Fair Value	158,253	155,166
Commercial paper
Current assets
Amortized Cost	5,895
Gross Unrealized Gains	0
Gross Unrealized Losses	(3)
Estimated Fair Value	5,892
Corporate bonds
Current assets
Amortized Cost	95,373	105,532
Gross Unrealized Gains	625	487
Gross Unrealized Losses	(1)	(10)
Estimated Fair Value	95,997	106,009
U.S. agency bonds
Current assets
Amortized Cost	19,995	20,935
Gross Unrealized Gains	9	52
Gross Unrealized Losses	0	(6)
Estimated Fair Value	$ 20,004	$ 20,981

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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).

+ References

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
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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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).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 30
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-Section 45
-Paragraph 1
-Publisher FASB
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