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Fair Value of Financial Instruments (Details 2) - USD ($) $ in Thousands	Oct. 31, 2022	Jul. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	$ 607,911
12 Months or Greater	163,335
Total	771,246	$ 1,058,619
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	177,719
12 Months or Greater	0
Total	177,719	197,998
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	222,767
12 Months or Greater	73,716
Total	296,483	315,602
Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	54,997
12 Months or Greater	0
Total	54,997	43,715
U.S. Government bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	30,490
12 Months or Greater	35,549
Total	66,039	45,702
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	67,752
12 Months or Greater	0
Total	67,752	349,492
U.S. Government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	44,880
12 Months or Greater	3,832
Total	48,712	36,986
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	1,427
12 Months or Greater	48,227
Total	49,654	54,171
Foreign government bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Less Than 12 Months	7,879
12 Months or Greater	2,011
Total	$ 9,890	14,748
Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total		$ 205