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v3.23.3

Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2023 USD ($) Security | May 31, 2023 USD ($) Security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized losses on available-for-sale securities | $ (206.9) | $ (175.3)
Number of available-for-sale securities in an unrealized loss position | Security | 1,027 | 967
Percentage of available-for-sale securities in an unrealized loss position | 96.00% | 88.00%
Gross unrealized losses on available-for-sale securities | $ 207.7 | $ 179.4
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 43.2 | 31.1
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Sep. 01, 2023 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Aug. 16, 2029 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 112.4 | $ 105.3
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Nov. 01, 2023 |
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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