Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Nov. 01, 2020	Oct. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (229,783)	$ (196,336)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	49,811	66,785
Amortization of debt discount and debt issuance costs	21,525	20,186
Stock-based compensation expense	179,755	174,790
Impairment of long-lived assets	7,505	0
Other	4,111	(483)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable, net	83,220	17,079
Inventory	(4,724)	2,722
Deferred commissions	(12,885)	(8,158)
Prepaid expenses and other assets	(37,606)	1,464
Operating lease right-of-use assets	21,434	19,962
Accounts payable	8,566	(35,244)
Accrued compensation and other liabilities	(9,737)	(31,011)
Operating lease liabilities	(20,444)	(19,020)
Deferred revenue	57,860	106,980
Net cash provided by operating activities	118,608	119,716
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(73,643)	(74,206)
Acquisitions, net of cash acquired	(339,806)	(51,594)
Purchase of intangible assets	0	(9,000)
Purchases of marketable securities	(454,391)	(640,024)
Sales of marketable securities	132,207	116,518
Maturities of marketable securities	324,780	345,657
Other	(5,000)	0
Net cash used in investing activities	(415,853)	(312,649)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	25,677	25,804
Proceeds from issuance of common stock under employee stock purchase plan	32,439	43,291
Proceeds from borrowings, net of issuance costs	251,892	0
Repayment of debt assumed from acquisition	0	(11,555)
Tax withholding on vesting of restricted stock	(4,080)	(8,787)
Repurchases of common stock	(111,554)	0
Net cash provided by financing activities	194,374	48,753
Net decrease in cash, cash equivalents and restricted cash	(102,871)	(144,180)
Cash, cash equivalents and restricted cash, beginning of period	377,922	463,813
Cash, cash equivalents and restricted cash, end of period	275,051	319,633
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	1,062	718
Cash paid for income taxes	8,911	3,398
Cash paid for amounts included in the measurement of lease liabilities	27,336	24,403
Property and equipment purchased but not yet paid	10,644	5,202
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	53,289	14,937
Business Combination, Fair Value of Equity Awards Assumed	$ 8,802	$ 0