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Funds Held for Clients and Corporate Investments (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2017 USD ($) security | Aug. 31, 2016 USD ($) | May 31, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |  |
Net unrealized gain on available-for-sale securities | $ 38.6 |  | $ 32.0
Number of available-for-sale securities in an unrealized loss position | security | 149 |  | 216
Gross unrealized losses on available-for-sale securities | $ 3.6 |  | $ 5.8
Realized losses on available-for-sale securities | $ 0.0 | $ 0.0 |
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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