Investments - Schedule of Unrealized Gains and Losses, and Estimated Fair Values of the Company’s Available-for-Sale Investments (Details) - USD ($) $ in Thousands	Oct. 31, 2024	Jan. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	$ 475,805	$ 429,988
Unrealized Gains	728	302
Unrealized Losses	(96)	(10)
Estimated Fair Value	476,437	430,280
Interest receivable	3,600	1,500
Money market funds \| Cash equivalents:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	169,797	79,082
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	169,797	79,082
Total cash equivalents \| Cash equivalents:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	169,797	83,579
Unrealized Gains	0	0
Unrealized Losses	0	0
Estimated Fair Value	169,797	83,579
Corporate bonds \| Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	138,643	99,547
Unrealized Gains	468	158
Unrealized Losses	(59)	(9)
Estimated Fair Value	139,052	99,696
U.S. Treasury securities \| Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	155,043	169,825
Unrealized Gains	212	123
Unrealized Losses	(37)	0
Estimated Fair Value	155,218	169,948
Commercial paper \| Cash equivalents:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost		4,497
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value		4,497
Commercial paper \| Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost		57,755
Unrealized Gains		0
Unrealized Losses		0
Estimated Fair Value		57,755
Agency securities \| Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	12,322	19,282
Unrealized Gains	48	21
Unrealized Losses	0	(1)
Estimated Fair Value	12,370	19,302
Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	306,008
Estimated Fair Value	306,640
Short-term investments: \| Short-term investments:
Debt and Equity Securities, FV-NI [Line Items]
Amortized Cost	306,008	346,409
Unrealized Gains	728	302
Unrealized Losses	(96)	(10)
Estimated Fair Value	$ 306,640	$ 346,701

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
-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
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Amount, after allowance for credit loss, of accrued interest 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 2A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amortized cost excluding accrued interest, before 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/2003/role/disclosureRef
-Topic 326
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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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-Topic 326
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