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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2021 USD ($) security | May 31, 2020 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized gains on available-for-sale securities | $ 79.3 | $ 100.0
Number of available-for-sale securities in an unrealized loss position | security | 137 | 19
Percentage of available-for-sale securities in an unrealized loss position | 11.00% | 2.00%
Gross unrealized losses on available-for-sale securities | $ 4.0 | $ 1.7
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 0.2 | 0.1
Corporate Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Jun. 01, 2021 |
Corporate Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | May 12, 2028 |
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses on available-for-sale securities | $ 2.3 | $ 1.6
Municipal Bonds [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Jun. 01, 2021 |
Municipal Bonds [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities maturity date | Aug. 01, 2028 |
VRDNs [Member] | Minimum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities contractual maturities | 20 years |
VRDNs [Member] | Maximum [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale securities contractual maturities | 30 years |

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