Service Revenue (Summary of PEO Pass-Through Costs Netted in Revenue) (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
May 31, 2025 |
May 31, 2024 |
May 31, 2023 |
|
| Revenue from Contract with Customer [Abstract] | |||
| Payroll wages and payroll taxes | $ 29,280.0 | $ 27,381.5 | $ 26,025.3 |
| State unemployment insurance (included in payroll wages and payroll taxes) | 167.4 | 151.8 | 138.2 |
| Guaranteed cost benefit plans | $ 681.6 | $ 660.3 | $ 656.3 |
| X | ||||||||||
- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans No definition available.
|
| X | ||||||||||
- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance No definition available.
|
| X | ||||||||||
- Definition Direct Pass Through Cost State Unemployment Insurance No definition available.
|
| X | ||||||||||
- References No definition available.
|