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v3.25.2

Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2025 USD ($) Security | May 31, 2025 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses on available-for-sale securities | $ (21.0) | $ (53.6)
Number of available-for-sale securities in an unrealized loss position | Security | 505 | 600
Percentage of available-for-sale securities in an unrealized loss position | 45.00% | 50.00%
Gross unrealized losses on available-for-sale securities | $ 50.8 | $ 68.0
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 5.0 | 7.0
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Sep. 01, 2025 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Jan. 23, 2035 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 33.2 | $ 44.3
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Sep. 01, 2025 |
Municipal Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Aug. 01, 2032 |
Variable Rate Demand Notes [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities contractual maturities | 20 years |
Variable Rate Demand Notes [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities contractual maturities | 30 years |

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