CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020
Cash flows from operating activities
Net loss	$ (222,418)	$ (191,143)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	9,989	9,515
Stock-based compensation	177,327	108,044
Amortization of debt discount and issuance costs	3,161	36,577
Amortization of finance right-of-use assets	2,981	2,981
Amortization of operating right-of-use assets	5,010	4,747
Deferred income taxes	(2,711)	(88)
Accretion of discount on short-term investments	4,978	383
Unrealized foreign exchange gain (loss)	503	(1,915)
Change in operating assets and liabilities:
Accounts receivable	(46,892)	(4,157)
Prepaid expenses and other current assets	(7,220)	247
Deferred commissions	(34,819)	(17,161)
Other long-term assets	(291)	(117)
Accounts payable	1,127	743
Accrued liabilities	34,138	19,633
Operating lease liabilities	(4,343)	(2,737)
Deferred revenue	58,498	5,765
Other liabilities, non-current	5,651	4,655
Net cash used in operating activities	(15,331)	(24,028)
Cash flows from investing activities
Purchases of property and equipment	(4,516)	(10,942)
Acquisition, net of cash acquired	(4,469)	0
Investment in non-marketable securities	(2,343)	(500)
Proceeds from maturities of marketable securities	400,000	540,000
Purchases of marketable securities	(932,250)	(812,574)
Net cash used in investing activities	(543,578)	(284,016)
Cash flows from financing activities
Payments of issuance costs for convertible senior notes	0	(4,154)
Proceeds from exercise of stock options, including early exercised stock options	7,591	13,798
Proceeds from issuance of common stock, net of issuance costs	889,184	0
Proceeds from the issuance of common stock under the Employee Stock Purchase Plan	12,963	8,963
Repurchase of early exercised stock options	0	(11)
Principal repayments of finance leases	(3,649)	(3,450)
Repayments of convertible senior notes attributable to principal	(27,594)	0
Proceeds from tenant improvement allowance on finance lease	0	856
Net cash provided by financing activities	878,495	16,002
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,148)	618
Net increase (decrease) in cash, cash equivalents and restricted cash	318,438	(291,424)
Cash, cash equivalents and restricted cash, beginning of period	430,222	706,706
Cash, cash equivalents and restricted cash, end of period	748,660	415,282
Cash paid during the period for:
Income taxes, net of refunds	3,651	1,145
Interest expense	4,066	4,387
Reconciliation of cash, cash equivalents and restricted cash within the condensed consolidated balance sheets, end of period, to the amounts shown in the statements of cash flows above
Cash and cash equivalents	748,140	414,762
Restricted cash, non-current	520	520
Total cash, cash equivalents and restricted cash	$ 748,660	$ 415,282