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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Apr. 30, 2024
Jul. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 734,005 $ 674,980
Cash equivalents 736,806 677,515
Investment in held to maturity securities 2,000,334 1,406,589
Investment in held to maturity securities 2,018,409 1,414,903
Assets, carrying value 2,734,339 2,081,569
Assets, fair value 2,755,215 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 fixed rate debt, including current portion $ 0 $ 11,006