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Fair Value Measurements - Fair Value of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2022	Jul. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 147,161	$ 160,441
Gross Unrealized Gains	1	156
Gross Unrealized Losses	(2,114)	(16)
Fair Value	145,048	160,581
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	54,889	42,009
Gross Unrealized Gains	0	35
Gross Unrealized Losses	(905)	0
Fair Value	53,984	42,044
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	700	1,500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	700	1,500
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,978	10,192
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,978	10,192
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7,505	10,393
Gross Unrealized Gains	1	18
Gross Unrealized Losses	(24)	(9)
Fair Value	7,482	10,402
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	81,089	96,347
Gross Unrealized Gains	0	103
Gross Unrealized Losses	(1,185)	(7)
Fair Value	$ 79,904	$ 96,443

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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