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Cash Equivalents and Short-Term Investments - Schedule of Cash Equivalents and Short-term Investments (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	$ 43,874
Cash equivalents, unrealized gains	0
Cash equivalents, unrealized losses	0
Cash equivalents	43,874
Short-term investments, amortized cost basis	307,773	$ 285,778
Short-term investment, unrealized gains	635	462
Short-term investments, unrealized losses	(28)	(78)
Short-term investments	308,380	286,162
Cash equivalents and short-term investments, amortized cost	351,647	340,814
Cash equivalents and short-term investments, unrealized gains	635	462
Cash equivalents and short-term investments, unrealized losses	(28)	(78)
Cash equivalents and short-term investments, estimated fair value	352,254	341,198
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	42,374	55,036
Cash equivalents, unrealized gains	0	0
Cash equivalents, unrealized losses	0	0
Cash equivalents	42,374	55,036
U.S. government agency securities
Debt Securities, Available-for-sale [Line Items]
Cash equivalents, amortized cost	1,500
Cash equivalents, unrealized gains	0
Cash equivalents, unrealized losses	0
Cash equivalents	1,500
Short-term investments, amortized cost basis	112,956	64,689
Short-term investment, unrealized gains	47	7
Short-term investments, unrealized losses	(23)	(50)
Short-term investments	112,980	64,646
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost basis	71,914	125,042
Short-term investment, unrealized gains	254	248
Short-term investments, unrealized losses	0	(9)
Short-term investments	72,168	125,281
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost basis	122,903	96,047
Short-term investment, unrealized gains	334	207
Short-term investments, unrealized losses	(5)	(19)
Short-term investments	$ 123,232	$ 96,235

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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