Fair Value Measurements (Details) - USD ($) $ in Thousands	Jul. 31, 2025	Jul. 31, 2024
Assets
Cash equivalents, carrying value	$ 2,196,593	$ 1,125,231
Cash equivalents, fair value	2,204,512	1,127,275
Investment in held to maturity securities, carrying value	2,008,539	1,908,047
Investment in held to maturity securities, fair value	2,024,114	1,926,345
Total assets, carrying value	4,205,132	3,033,278
Total assets, fair value	$ 4,228,626	$ 3,053,620