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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 USD ($) security | Aug. 31, 2018 USD ($) security | May 31, 2018 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net unrealized losses on available-for-sale securities | $ 35.9 | $ 35.9 | $ 38.3
Number of available-for-sale securities in an unrealized loss position | security | 916 | 916 | 970
Gross unrealized losses on available-for-sale securities | $ 38.8 | $ 38.8 | $ 40.7
Maximum [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Short-term investments maturity at acquisition | 90 days |  |
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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