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Summary of Significant Accounting Policies - Cash, Cash Equivalents, and Restricted Cash and Investments (Details) - USD ($) $ in Thousands | Jul. 31, 2024 | Jul. 31, 2023
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Accounting Policies [Abstract] |  |
Amortized Cost | $ 1,908,047 | $ 1,406,589
Gross Unrealized Gains | 18,298 | 8,314
Fair Value | $ 1,926,345 | $ 1,414,903

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