CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Oct. 31, 2021	Oct. 31, 2020
Cash flows from operating activities:
Net loss		$ (419,852)	$ (265,048)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization		23,291	23,499
Stock-based compensation		90,547	89,198
Change in fair value of derivative liability		198,038	64,740
Loss on debt extinguishment		64,910
Amortization of debt discount and issuance costs		9,831	11,708
Operating lease cost, net of accretion		9,189	8,347
Impairment of lease-related assets			2,822
Non-cash interest expense		4,773	1,952
Other		3,072	1,671
Changes in operating assets and liabilities:
Accounts receivable, net		64,740	60,094
Deferred commissions		(6,225)	(28,230)
Prepaid expenses and other assets		6,751	6,222
Accounts payable		(3,139)	(4,075)
Accrued compensation and benefits		(39,965)	10,041
Accrued expenses and other liabilities		(6,207)	(1,238)
Operating leases, net		(12,323)	(7,970)
Deferred revenue		19,508	22,194
Net cash (used in) provided by operating activities		6,939	(4,073)
Cash flows from investing activities:
Maturities of investments		272,024	97,578
Purchases of investments		(290,050)	(513,998)
Sales of investments		17,999
Purchases of property and equipment		(8,844)	(12,252)
Net cash used in investing activities		(8,871)	(428,672)
Cash flows from financing activities:
Payments of debt extinguishment costs		(14,709)
Proceeds from unwinding of convertible note hedges		39,880
Payments for unwinding of warrants		(18,390)
Proceeds from sales of shares through employee equity incentive plans		30,139	19,600
Proceeds from the issuance of convertible notes, net of issuance costs		89,128	723,757
Repurchases of common stock		(58,570)	(125,079)
Payment of finance lease obligations		(219)
Net cash provided by financing activities		67,259	618,278
Net increase in cash, cash equivalents and restricted cash		65,327	185,533
Cash, cash equivalents and restricted cash—beginning of period		288,873	321,991
Cash, cash equivalents and restricted cash—end of period		354,200	507,524
Restricted cash	[1]	3,215	3,042
Cash and cash equivalents—end of period		350,985	504,482
Supplemental disclosures of cash flow information:
Cash paid for income taxes		6,181	5,050
Supplemental disclosures of non-cash investing and financing information:
Purchases of property and equipment included in accounts payable and accrued and other liabilities		12,099	$ 2,948
Finance lease liabilities arising from obtaining right-of-use assets		7,857
Convertible senior notes offering costs included in accrued liabilities		$ 700

[1] Included within other assets—non-current in the condensed consolidated balance sheets.