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	$ (305,579)	$ (155,429)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	20,494	13,415
Amortization of deferred commissions	26,878	30,032
Amortization of investment premiums, net (accretion of discounts)	(692)	(2,859)
Amortization of debt discount and issuance costs	20,416	19,005
Non-cash operating lease costs	10,531	4,549
Stock-based compensation	158,818	123,063
Disposal of property and equipment	505	0
Deferred income taxes	(901)	(20)
Changes in operating assets and liabilities
Accounts receivable, net	327,099	184,358
Prepaid expenses and other assets	(4,846)	(17,900)
Deferred commissions	(22,215)	(23,452)
Accounts payable	7,336	2,925
Accrued compensation	(97,709)	(62,777)
Accrued expenses and other liabilities	(10,067)	(7,665)
Deferred revenue	(84,024)	(72,216)
Net cash provided by operating activities	46,044	35,029
Cash flows from investing activities
Purchases of investments	(87,135)	(289,425)
Maturities of investments	254,823	298,425
Purchases of property and equipment	(14,756)	(14,900)
Capitalized software development costs	(3,548)	0
Other investment activities	2,375	375
Net cash provided by (used in) investing activities	147,009	(6,275)
Cash flows from financing activities
Proceeds from the exercise of stock options	1,418	360
Taxes paid related to net share settlement of equity awards	(49,228)	(69,007)
Net cash used in financing activities	(47,810)	(68,647)
Effect of exchange rate changes on cash and cash equivalents	(1,389)	(1,043)
Net increase (decrease) in cash and cash equivalents	143,854	(40,936)
Cash and cash equivalents at beginning of period	778,653	1,876,165
Cash and cash equivalents at end of period	922,507	1,835,229
Supplemental disclosures
Cash paid for income taxes	1,534	8,316
Cash paid for interest	8,014	7,747
Non-cash investing activities
Decrease in accrued purchases of property and equipment	(1,639)	(853)
Vesting of early exercised options	$ 56	$ 0

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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