CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Cash flows from operating activities
Net loss	$ (196,159,000)	$ (141,125,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	7,745,000	6,622,000
Stock-based compensation	180,120,000	108,619,000
Amortization of debt issuance costs	1,685,000	2,319,000
Amortization of finance right-of-use assets	1,987,000	1,988,000
Amortization of operating right-of-use assets	4,458,000	3,232,000
Deferred income taxes	(302,000)	(2,378,000)
Accretion of discount on short-term investments	4,076,000	2,994,000
Gain on non-marketable securities	(1,694,000)	0
Unrealized foreign exchange (gain) loss	(1,144,000)	1,044,000
Change in operating assets and liabilities:
Accounts receivable	(19,480,000)	16,323,000
Prepaid expenses and other current assets	4,908,000	(5,849,000)
Deferred commissions	(16,555,000)	(16,456,000)
Other long-term assets	(862,000)	(52,000)
Accounts payable	2,161,000	447,000
Accrued liabilities	(201,000)	1,467,000
Operating lease liabilities	(4,549,000)	(2,595,000)
Deferred revenue	331,000	9,791,000
Other liabilities, non-current	378,000	4,068,000
Net cash used in operating activities	(33,097,000)	(9,541,000)
Cash flows from investing activities
Purchases of property and equipment	(5,152,000)	(2,332,000)
Acquisition, net of cash acquired	0	(4,469,000)
Investment in non-marketable securities	(1,119,000)	(1,136,000)
Proceeds from maturities of marketable securities	400,000,000	275,000,000
Purchases of marketable securities	(197,614,000)	(403,986,000)
Net cash provided by (used in) investing activities	196,115,000	(136,923,000)
Cash flows from financing activities
Proceeds from exercise of stock options	2,988,000	5,745,000
Proceeds from issuance of common stock, net of issuance costs	0	889,564,000
Proceeds from the issuance of common stock under the Employee Stock Purchase Plan	15,777,000	12,963,000
Principal repayments of finance leases	(1,882,000)	(2,415,000)
Repayments of convertible senior notes attributable to principal	0	(27,594,000)
Net cash provided by financing activities	16,883,000	878,263,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2,395,000)	(502,000)
Net increase in cash, cash equivalents and restricted cash	177,506,000	731,297,000
Cash, cash equivalents and restricted cash, beginning of period	474,420,000	430,222,000
Cash, cash equivalents and restricted cash, end of period	651,926,000	1,161,519,000
Cash paid during the period for:
Income taxes, net of refunds	4,233,000	2,362,000
Interest expense	2,925,000	3,281,000
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	651,420,000	1,160,996,000
Restricted cash, non-current	506,000	523,000
Total cash, cash equivalents and restricted cash	$ 651,926,000	$ 1,161,519,000