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Income Taxes - Schedule of Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2026 | May 31, 2025 | May 31, 2024
Income Tax Disclosure [Abstract] |  |  |
Tax jurisdiction of domicile | United States Plan |  |
Amount |  |  |
Income taxes at the U.S. federal statutory rate | $ 526,120 | $ 475,482 | $ 414,463
Permanent differences |  | (75,966) | (67,310)
State and local income taxes, net of federal benefit | 63,394 | 64,052 | 49,560
Other |  | (11,647) | 5,330
Foreign tax effects | (4,835) |  |
Effect of cross-border tax laws | (3,219) |  |
Tax credits | (13,325) |  |
Stock-based compensation | (52,953) |  |
Other nontaxable and nondeductible items, net | (15,857) |  |
Changes in unrecognized tax benefits | 5,719 |  |
Other | 322 |  |
Income taxes | $ 505,366 | $ 451,921 | $ 402,043
Percent |  |  |
Income taxes at the U.S. federal statutory rate | 21.00% |  |
State and local income taxes, net of federal benefit | 2.50% |  |
Foreign tax effects | (0.20%) |  |
Effect of cross-border tax laws | (0.10%) |  |
Tax credits | (0.50%) |  |
Stock-based compensation | (2.10%) |  |
Other nontaxable and nondeductible items, net | (0.60%) |  |
Changes in unrecognized tax benefits | 0.20% |  |
Other | 0.00% |  |
Effective income tax rate | 20.20% |  |

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