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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2020 USD ($) security | May 31, 2019 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Net unrealized gains on available-for-sale securities | $ 100.0 | $ 19.7
Number of available-for-sale securities in an unrealized loss position | security | 19 | 269
Percentage of available-for-sale securities in an unrealized loss position | 2.00% | 28.00%
Gross unrealized losses on available-for-sale securities | $ 1.7 | $ 2.7
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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