Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Aug. 02, 2020	Jul. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (155,561)	$ (166,354)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	31,597	43,591
Amortization of debt discount and debt issuance costs	14,125	13,290
Stock-based compensation expense	120,146	120,561
Impairment of long-lived assets	7,505	0
Other	1,972	327
Changes in operating assets and liabilities, net of effects of acquisition:
Accounts receivable, net	91,896	26,553
Inventory	1,735	6,852
Deferred commissions	(5,483)	(3,595)
Prepaid expenses and other assets	(26,389)	(635)
Operating lease right-of-use assets	14,181	13,438
Accounts payable	(21,090)	(30,827)
Accrued compensation and other liabilities	(3,217)	(25,704)
Operating lease liabilities	(13,071)	(13,083)
Deferred revenue	27,463	71,045
Net cash provided by operating activities	85,809	55,459
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of property and equipment	(48,776)	(53,229)
Acquisition, net of cash acquired	0	(47,881)
Purchase of intangible assets	0	(9,000)
Purchases of marketable securities	(291,237)	(488,497)
Sales of marketable securities	91,351	60,368
Maturities of marketable securities	206,174	270,756
Net cash used in investing activities	(42,488)	(267,483)
CASH FLOWS FROM FINANCING ACTIVITIES
Net proceeds from exercise of stock options	21,658	19,260
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	(2,841)	(7,173)
Repurchases of common stock	(90,143)	0
Net cash provided by (used in) financing activities	(50,355)	32,574
Net decrease in cash, cash equivalents and restricted cash	(7,034)	(179,450)
Cash, cash equivalents and restricted cash, beginning of period	377,922	463,813
Cash, cash equivalents and restricted cash, end of period	370,888	284,363
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest	359	359
Cash paid for income taxes	5,070	2,716
Cash paid for amounts included in the measurement of lease liabilities	17,849	16,167
Property and equipment purchased but not yet paid	6,619	5,717
Operating lease right-of-use assets obtained in exchange for operating lease liabilities	$ 29,754	$ 3,449