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Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2024	Jul. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 1,125,231	$ 674,980
Cash equivalents	1,127,275	677,515
Investment in held to maturity securities	1,908,047	1,406,589
Investment in held to maturity securities	1,926,345	1,414,903
Assets, carrying value	3,033,278	2,081,569
Assets, fair value	3,053,620	2,092,418
Liabilities, carrying value	0	11,006
Total liabilities	0	11,006
Fixed Rate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt	0	11,006
Long-term debt, including current portion	$ 0	$ 11,006

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