Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Jan. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 632,786	$ 723,206
Gross Unrealized Gains	535	264
Gross Unrealized Losses	(407)	(771)
Estimated Fair Value	632,914	722,699
Cash	464,700	444,800
Cash Equivalents \| Level 1 \| Money market funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	183,885	298,517
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	183,885	298,517
Cash Equivalents \| Level 2 \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost		43,845
Gross Unrealized Gains		0
Gross Unrealized Losses		(9)
Estimated Fair Value		43,836
Cash Equivalents \| Level 2 \| U.S. governmental securities
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
Short-term Investments \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	448,901	424,689
Gross Unrealized Gains	535	264
Gross Unrealized Losses	(407)	(771)
Estimated Fair Value	449,029	424,182
Short-term Investments \| Level 2 \| Commercial paper
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	31,367	42,958
Gross Unrealized Gains	12	2
Gross Unrealized Losses	(8)	(25)
Estimated Fair Value	31,371	42,935
Short-term Investments \| Level 2 \| Corporate notes and bonds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	399,034	299,166
Gross Unrealized Gains	522	262
Gross Unrealized Losses	(378)	(670)
Estimated Fair Value	399,178	298,758
Short-term Investments \| Level 2 \| U.S. governmental securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	18,500	28,752
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(21)	(66)
Estimated Fair Value	$ 18,480	$ 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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