Cash Equivalents and Short-Term Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jul. 31, 2024	Jul. 31, 2023
Cash equivalents:
Amortized Cost	$ 1,273,615	$ 1,130,724
Unrealized Gains	0	0
Unrealized Losses	(21)	(65)
Fair Value	1,273,594	1,130,659
Short-term investments:
Amortized Cost	987,004	848,360
Unrealized Gains	1,565	51
Unrealized Losses	(1,995)	(10,385)
Fair Value	986,574	838,026
Total cash equivalents and short-term investments, amortized cost	2,260,619	1,979,084
Total cash equivalents and short-term investments, unrealized gains	1,565	51
Total cash equivalents and short-term investments, unrealized losses	(2,016)	(10,450)
Total cash equivalents and short-term investments	2,260,168	1,968,685
U.S. treasury securities
Short-term investments:
Amortized Cost	257,841	175,451
Unrealized Gains	8	0
Unrealized Losses	(828)	(1,875)
Fair Value	257,021	173,576
U.S. government agency securities
Short-term investments:
Amortized Cost	160,574	266,392
Unrealized Gains	43	2
Unrealized Losses	(542)	(4,299)
Fair Value	160,075	262,095
Corporate debt securities
Short-term investments:
Amortized Cost	568,589	406,517
Unrealized Gains	1,514	49
Unrealized Losses	(625)	(4,211)
Fair Value	569,478	402,355
Money market funds
Cash equivalents:
Amortized Cost	956,932	768,003
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	956,932	768,003
U.S. treasury securities
Cash equivalents:
Amortized Cost	178,188	157,250
Unrealized Gains	0	0
Unrealized Losses	(15)	(30)
Fair Value	178,173	157,220
U.S. government agency securities
Cash equivalents:
Amortized Cost	57,555	166,671
Unrealized Gains	0	0
Unrealized Losses	(6)	(35)
Fair Value	57,549	166,636
Certificates of deposit
Cash equivalents:
Amortized Cost	80,940
Unrealized Gains	0
Unrealized Losses	0
Fair Value	$ 80,940
Corporate debt securities
Cash equivalents:
Amortized Cost		38,800
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 38,800