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Cash Equivalents and Short-Term Investments - Schedule of Maturities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Jul. 31, 2019
Amortized Cost
Due within one year, cost basis	$ 173,815
Due between one and two years, cost basis	133,958
Short-term investments, amortized cost basis	307,773	$ 285,778
Fair Value
Due within one year, fair value	174,232
Due between one and two years, fair value	134,148
Total short-term investments, fair value	$ 308,380	$ 286,162

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Amortized cost 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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