CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Cash flows from operating activities:
Net income	$ 544,615	$ 213,064
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	201,111	85,632
Amortization of deferred contract acquisition costs	79,392	40,781
Gains on strategic investments	(32,076)	(2,538)
Depreciation and amortization	22,691	11,814
Provision for accounts receivable allowances	14,592	14,959
Non-cash operating lease cost	8,633	4,597
Charitable donation of common stock	0	23,312
Amortization on marketable securities	12,637	1,190
Other	264	838
Changes in operating assets and liabilities:
Accounts receivable	(117,259)	(196,926)
Prepaid expenses and other assets	(57,370)	(53,729)
Deferred contract acquisition costs	(102,597)	(213,790)
Accounts payable	43,960	10,871
Accrued expenses and other liabilities	93,809	202,066
Deferred revenue	296,636	519,149
Operating lease liabilities, net	(7,724)	(979)
Net cash provided by operating activities	1,001,314	660,311
Cash flows from investing activities:
Purchases of marketable securities	(2,094,587)	(484,882)
Maturities of marketable securities	791,906	287,338
Sales of marketable securities	119,569	36,897
Purchases of property and equipment	(92,049)	(35,253)
Purchases of strategic investments	(86,900)	(13,000)
Cash paid for acquisition, net of cash acquired	(2,121)	(26,486)
Purchase of intangible assets	0	(1,494)
Other	0	1,319
Net cash used in investing activities	(1,364,182)	(235,561)
Cash flows from financing activities:
Proceeds from issuance of common stock for employee stock purchase plan	37,846	20,760
Proceeds from employee equity transactions to be remitted to employees and tax authorities, net	18,900	234,465
Proceeds from exercise of stock options	8,021	17,417
Other	337	0
Net cash provided by financing activities	65,104	272,642
Net (decrease) increase in cash, cash equivalents, and restricted cash	(297,764)	697,392
Cash, cash equivalents, and restricted cash – beginning of period	2,293,116	334,082
Cash, cash equivalents, and restricted cash – end of period	1,995,352	1,031,474
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	1,931,370	748,944
Restricted cash, current included in prepaid expenses and other current assets	63,185	280,309
Restricted cash, noncurrent included in other assets, noncurrent	797	2,221
Total cash, cash equivalents, and restricted cash	$ 1,995,352	$ 1,031,474