CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Deficit
Stockholders' equity, beginning balance at Jul. 31, 2021	$ (1,020,969)	$ 5	$ 2,615,317	$ (8)	$ (3,636,283)
Stockholders' equity, beginning balance (ASU 2020-06) at Jul. 31, 2021	(48,013)		(148,598)		100,585
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2021		214,210,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
2026 Notes derivative liability reclassification	698,213		698,213
Issuance of common stock through employee equity incentive plans	1,352		1,352
Issuance of common stock through employee equity incentive plans (in shares)		2,809,000
Issuance of common stock from ESPP purchase	28,786		28,786
Issuance of common stock from ESPP purchase (in shares)		1,309,000
Repurchase and retirement of common stock	(58,570)		(14,852)		(43,718)
Repurchase and retirement of common stock (in shares)		(1,369,000)
Unwinding of 2023 Notes hedges	39,880		39,880
Unwinding of 2023 Notes warrants	(18,390)		(18,390)
Stock-based compensation	90,547		90,547
Other comprehensive income	(651)			(651)
Net loss	(420,206)				(420,206)
Stockholders' equity, ending balance at Oct. 31, 2021	(708,021)	$ 5	3,292,255	(659)	(3,999,622)
Stockholders' equity, ending balance (in shares) at Oct. 31, 2021		216,959,000
Stockholders' equity, beginning balance at Jul. 31, 2021	(1,020,969)	$ 5	2,615,317	(8)	(3,636,283)
Stockholders' equity, beginning balance (ASU 2020-06) at Jul. 31, 2021	(48,013)		(148,598)		100,585
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2021		214,210,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(535,622)
Stockholders' equity, ending balance at Jan. 31, 2022	(735,254)	$ 5	3,382,214	(2,435)	(4,115,038)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2022		220,539,000
Stockholders' equity, beginning balance at Oct. 31, 2021	(708,021)	$ 5	3,292,255	(659)	(3,999,622)
Stockholders' equity, beginning balance (in shares) at Oct. 31, 2021		216,959,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through employee equity incentive plans	1,914		1,914
Issuance of common stock through employee equity incentive plans (in shares)		3,580,000
Stock-based compensation	88,045		88,045
Other comprehensive income	(1,776)			(1,776)
Net loss	(115,416)				(115,416)
Stockholders' equity, ending balance at Jan. 31, 2022	(735,254)	$ 5	3,382,214	(2,435)	(4,115,038)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2022		220,539,000
Stockholders' equity, beginning balance at Jul. 31, 2022	(800,504)	$ 6	3,583,928	(6,076)	(4,378,362)
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2022		226,938,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through employee equity incentive plans	1,975		1,975
Issuance of common stock through employee equity incentive plans (in shares)		2,172,000
Issuance of common stock from ESPP purchase	18,947		18,947
Issuance of common stock from ESPP purchase (in shares)		998,000
Stock-based compensation	80,955		80,955
Other comprehensive income	(3,642)			(3,642)
Net loss	(99,514)				(99,514)
Stockholders' equity, ending balance at Oct. 31, 2022	(801,783)	$ 6	3,685,805	(9,718)	(4,477,876)
Stockholders' equity, ending balance (in shares) at Oct. 31, 2022		230,108,000
Stockholders' equity, beginning balance at Jul. 31, 2022	(800,504)	$ 6	3,583,928	(6,076)	(4,378,362)
Stockholders' equity, beginning balance (in shares) at Jul. 31, 2022		226,938,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(170,304)
Stockholders' equity, ending balance at Jan. 31, 2023	(782,682)	$ 6	3,771,779	(5,801)	(4,548,666)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2023		233,591,000
Stockholders' equity, beginning balance at Oct. 31, 2022	(801,783)	$ 6	3,685,805	(9,718)	(4,477,876)
Stockholders' equity, beginning balance (in shares) at Oct. 31, 2022		230,108,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock through employee equity incentive plans		$ 684	684
Issuance of common stock through employee equity incentive plans (in shares)		3,483,000
Stock-based compensation		$ 85,290	85,290
Other comprehensive income		3,917		3,917
Net loss	(70,790)	(70,790)			(70,790)
Stockholders' equity, ending balance at Jan. 31, 2023	$ (782,682)	$ 6	$ 3,771,779	$ (5,801)	$ (4,548,666)
Stockholders' equity, ending balance (in shares) at Jan. 31, 2023		233,591,000