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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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