CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOW - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ 213,064	$ 7,755
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	85,632	24,737
Amortization of deferred contract acquisition costs	40,781	16,026
Charitable donation of common stock	23,312	0
Provision for accounts receivable allowances	14,959	2,693
Depreciation and amortization	11,814	7,174
Non-cash operating lease cost	4,597	3,116
Remeasurement gain on equity investment	(2,538)	0
Other	2,028	(514)
Changes in operating assets and liabilities:
Accounts receivable	(196,926)	(35,361)
Prepaid expenses and other assets	(53,729)	(23,597)
Deferred contract acquisition costs	(213,790)	(33,700)
Accounts payable	10,871	(2,783)
Accrued expenses and other liabilities	202,066	34,923
Deferred revenue	519,149	56,234
Operating lease liabilities, net	(979)	(3,295)
Net cash provided by operating activities	660,311	53,408
Cash flows from investing activities:
Purchases of marketable securities	(484,882)	(478,487)
Maturities of marketable securities	287,338	50,940
Sales of marketable securities	36,897	0
Purchases of property and equipment	(35,253)	(20,937)
Cash paid for acquisition, net of cash acquired	(26,486)	0
Purchase of equity investment	(8,000)	0
Purchase of convertible promissory note	(5,000)	0
Purchase of intangible assets	(1,494)	0
Collections of employee loans	1,319	0
Net cash used in investing activities	(235,561)	(448,484)
Cash flows from financing activities:
Proceeds from employee equity transactions to be remitted to employees and tax authorities, net	234,465	0
Proceeds from issuance of common stock for employee stock purchase plan	20,760	0
Proceeds from exercise of stock options, net of repurchases	17,417	2,191
Proceeds from initial public offering and private placement, net of underwriting discounts and commissions and other offering costs	0	542,947
Net cash provided by financing activities	272,642	545,138
Net increase in cash, cash equivalents, and restricted cash	697,392	150,062
Cash, cash equivalents, and restricted cash – beginning of period	334,082	65,968
Cash, cash equivalents, and restricted cash – end of period	1,031,474	216,030
Reconciliation of cash, cash equivalents, and restricted cash within the condensed consolidated balance sheets to the amounts shown in the condensed consolidated statements of cash flows above:
Cash and cash equivalents	748,944	213,886
Total cash, cash equivalents, and restricted cash	$ 1,031,474	$ 216,030