CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Cash flows from operating activities:
Net income	$ 227,531	$ 27,075
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation expense	98,969	28,777
Amortization of deferred contract acquisition costs	37,766	16,287
Depreciation and amortization	10,663	5,339
Provision for accounts receivable allowances	4,055	3,868
Non-cash operating lease cost	4,274	2,248
Charitable donation of common stock	0	1,000
Other	5,866	(1,421)
Changes in operating assets and liabilities:
Accounts receivable	(75,665)	(142,501)
Prepaid expenses and other assets	(29,975)	(49,080)
Deferred contract acquisition costs	(47,813)	(124,854)
Accounts payable	1,592	1,756
Accrued expenses and other liabilities	88,656	167,322
Deferred revenue	210,896	322,862
Operating lease liabilities, net	(3,513)	287
Net cash provided by operating activities	533,302	258,965
Cash flows from investing activities:
Purchases of marketable securities	(1,425,451)	(207,546)
Maturities of marketable securities	291,047	137,014
Sales of marketable securities	0	26,613
Purchases of property and equipment	(79,074)	(7,272)
Purchase of equity investment	0	(8,000)
Purchase of convertible promissory note	(6,500)	(5,000)
Purchase of intangible assets	0	(162)
Other	0	1,319
Net cash used in investing activities	(1,219,978)	(63,034)
Cash flows from financing activities:
Proceeds from employee equity transactions (remitted) to be remitted to employees and tax authorities, net	(9,984)	218,540
Proceeds from exercise of stock options	3,368	9,586
Other	337	0
Net cash (used in) provided by financing activities	(6,279)	228,126
Net (decrease) increase in cash, cash equivalents, and restricted cash	(692,955)	424,057
Cash, cash equivalents, and restricted cash – beginning of period	2,293,116	334,082
Cash, cash equivalents, and restricted cash – end of period	1,600,161	758,139
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	1,557,270	488,653
Total cash, cash equivalents, and restricted cash	$ 1,600,161	$ 758,139