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v3.25.2

Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 12 Months Ended
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May 31, 2025 USD ($) Security | May 31, 2024 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses on available-for-sale securities | $ (53.6) | $ (162.5)
Number of available-for-sale securities in an unrealized loss position | Security | 600 | 957
Percentage of available-for-sale securities in an unrealized loss position | 50.00% | 95.00%
Gross unrealized losses on available-for-sale securities | $ 68.0 | $ 164.2
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 7.0 | 32.8
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Jun. 01, 2025 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | May 12, 2032 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 44.3 | $ 86.9
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Jun. 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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