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v3.23.4

Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2023 USD ($) Security | May 31, 2023 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses on available-for-sale securities | $ (187.2) | $ (175.3)
Number of available-for-sale securities in an unrealized loss position | Security | 991 | 967
Percentage of available-for-sale securities in an unrealized loss position | 94.00% | 88.00%
Gross unrealized losses on available-for-sale securities | $ 189.2 | $ 179.4
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 37.5 | 31.1
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Dec. 01, 2023 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Sep. 15, 2029 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 105.0 | $ 105.3
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Feb. 01, 2024 |
Municipal Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Oct. 01, 2031 |
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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