Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2020	Apr. 30, 2019
Cash flows from operating activities:
Net loss	$ (57,662)	$ (51,966)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation	37,728	22,685
Depreciation, amortization and accretion	5,466	3,399
Amortization of debt discount and issuance costs	10,357	4,025
Amortization of deferred commissions	8,680	6,328
Deferred income taxes	(905)	(1,369)
Non-cash charitable contributions	536	0
Other, net	915	(100)
Changes in operating assets and liabilities:
Accounts receivable	18,250	9,297
Deferred commissions	(11,865)	(9,795)
Prepaid expenses and other assets	(3,493)	5,975
Operating lease right-of-use assets	4,055	3,066
Accounts payable	3,943	1,640
Accrued compensation	2,995	4,143
Accrued expenses and other liabilities	(2,773)	3,288
Operating lease liabilities	(4,270)	(39)
Deferred revenue	26,740	20,685
Net cash provided by operating activities	38,697	21,262
Cash flows from investing activities:
Capitalization of internal-use software costs	(1,000)	(369)
Purchases of property and equipment	(7,930)	(7,710)
Purchases of securities available for sale and other	(129,079)	(146,545)
Proceeds from maturities and redemption of securities available for sale	102,293	61,244
Proceeds from sales of securities available for sale	86,320	11,996
Payments for business acquisition, net of cash acquired	0	(44,223)
Net cash provided by (used in) investing activities	50,604	(125,607)
Cash flows from financing activities:
Proceeds from stock option exercises	14,172	13,388
Other, net	(5)	(126)
Net cash provided by financing activities	14,167	13,262
Effects of changes in foreign currency exchange rates on cash, cash equivalents and restricted cash	(1,128)	(282)
Net increase (decrease) in cash, cash equivalents and restricted cash	102,340	(91,365)
Cash, cash equivalents and restricted cash at beginning of period	531,953	311,215
Cash, cash equivalents and restricted cash at end of period	634,293	219,850
Supplementary cash flow disclosure:
Interest	784	431
Income taxes	209	143
Vesting of early exercised common stock options	0	128
Common stock issued as charitable contribution	536	0
Operating lease right-of-use assets exchanged for lease obligations	41,444	1,665
Property and equipment acquired through tenant improvement allowance	2,598	0
Property and equipment and other accrued but not yet paid	533	924
Issuance of common stock for bonus settlement	9,818	2,809
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:
Total cash, cash equivalents and restricted cash	$ 634,293	$ 219,850