Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	May 03, 2020	Apr. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (90,594)	$ (100,336)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,133	21,060
Amortization of debt discount and debt issuance costs	6,936	6,490
Stock-based compensation expense	58,694	62,157
Other	1,705	(811)
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable, net	109,441	67,299
Inventory	(1,370)	(2,023)
Deferred commissions	(3,159)	1,716
Prepaid expenses and other assets	(6,298)	(7,298)
Operating lease right-of-use assets	6,706	6,209
Accounts payable	(14,294)	(25,807)
Accrued compensation and other liabilities	(49,643)	(43,993)
Operating lease liabilities	(6,926)	(6,034)
Deferred revenue	8,772	28,013
Net cash provided by operating activities	35,103	6,642
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(23,782)	(24,296)
Acquisition, net of cash acquired	0	(47,881)
Purchases of marketable securities	(98,161)	(312,859)
Sales of marketable securities	17,657	22,344
Maturities of marketable securities	95,375	164,139
Net cash used in investing activities	(8,911)	(198,553)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	9,275	16,761
Proceeds from issuance of common stock under employee stock purchase plan	16,021	32,042
Proceeds from borrowing	4,950	0
Repayment of debt assumed from acquisition	0	(11,555)
Tax withholding on vesting of restricted stock	(1,374)	(5,672)
Repurchases of common stock	(70,119)	0
Net cash provided by (used in) financing activities	(41,247)	31,576
Net decrease in cash, cash equivalents and restricted cash	(15,055)	(160,335)
Cash, cash equivalents and restricted cash, beginning of period	377,922	463,813
Cash, cash equivalents and restricted cash, end of period	362,867	303,478
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF PERIOD
Cash, cash equivalents and restricted cash, end of period	362,867	303,478
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	359	359
Cash paid for income taxes	2,376	1,640
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING INFORMATION
Property and equipment purchased but not yet paid	$ 8,274	$ 11,595