CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net loss	$ (203,220)	$ (93,644)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	4,684	1,522
Non-cash operating lease costs	8,509	8,125
Amortization of deferred commissions	8,316	7,226
Stock-based compensation, net of amounts capitalized	151,014	20,445
Net amortization (accretion) of premiums (discounts) on investments	13,019	(53)
Other	1,214	(175)
Changes in operating assets and liabilities:
Accounts receivable	127,179	82,701
Deferred commissions	(14,749)	(5,544)
Prepaid expenses and other assets	(54,357)	(8,946)
Accounts payable	(1,245)	(2,857)
Accrued expenses and other liabilities	(6,567)	(5,155)
Operating lease liabilities	(7,833)	(7,587)
Deferred revenue	(4,110)	(2,650)
Net cash provided by (used in) operating activities	21,854	(6,592)
Cash flows from investing activities:
Purchases of property and equipment	(6,430)	(2,033)
Capitalized internal-use software development costs	(2,480)	(2,189)
Purchases of intangible assets	(10,460)	(6,000)
Purchases of investments	(1,145,670)	(253,824)
Sales of investments	384,383	0
Maturities and redemptions of investments	516,588	92,042
Net cash used in investing activities	(264,069)	(172,004)
Cash flows from financing activities:
Proceeds from issuance of redeemable convertible preferred stock, net of issuance costs	0	478,573
Proceeds from early exercised stock options	0	159
Proceeds from exercise of stock options	41,402	10,872
Proceeds from issuance of common stock under the employee stock purchase plan	26,398	0
Repurchases of early exercised stock options and restricted common stock	0	(30)
Payments of deferred offering costs	0	(105)
Net cash provided by financing activities	67,800	489,469
Effect of exchange rate changes on cash, cash equivalents and restricted cash	19	0
Net increase (decrease) in cash, cash equivalents, and restricted cash	(174,396)	310,873
Cash, cash equivalents, and restricted cash—beginning of period	835,193	141,976
Cash, cash equivalents, and restricted cash—end of period	660,797	452,849
Supplemental disclosures of cash flow information:
Property and equipment included in accounts payable and accrued expenses	3,469	929
Stock-based compensation included in capitalized software development costs	6,210	560
Intangible assets included in accrued expenses and other liabilities	5,039	0
Reconciliation of cash, cash equivalents and restricted cash:
Total cash, cash equivalents and restricted cash	$ 660,797	$ 452,849