Fair Value Measurements (Tables)

12 Months Ended

Jan. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents information about the Company’s financial assets that were measured at fair value on a recurring basis using the above input categories (in thousands):

	As of January 31, 2022
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	152,223	$	—	$	—	$	152,223
Total cash equivalents	152,223		—		—		152,223
Short-term investments:
U.S. treasury securities	—		1,912,188		—		1,912,188
Corporate debt securities	—		329,469		—		329,469
Total short-term investments	—		2,241,657		—		2,241,657
Total cash equivalents and short-term investments	$	152,223	$	2,241,657	$	—	$	2,393,880

	As of January 31, 2021
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents:
Money market funds	$	311,257	$	—	$	—	$	311,257
Total cash equivalents	311,257		—		—		311,257
Short-term investments:
U.S. treasury securities	—		1,890,431		—		1,890,431
Corporate debt securities	—		231,153		—		231,153
Total short-term investments	—		2,121,584		—		2,121,584
Total cash equivalents and short-term investments	$	311,257	$	2,121,584	$	—	$	2,432,841

Schedule of Carrying Amounts and Estimated Fair Values of Convertible Note

The following table presents the carrying amounts and estimated fair values of the Company's financial instruments that are not recorded at fair value on the consolidated balance sheets (in thousands):

	As of January 31, 2022
	Net Carrying Amount(1)		Estimated Fair Value
2023 convertible senior notes	$	16,295	$	68,698
2025 convertible senior notes	$	920,799	$	1,323,406
2026 convertible senior notes	$	913,875	$	1,270,394

(1)    Before unamortized debt issuance costs.