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Business Combinations (Narrative) (Details) $ in Millions |  |  | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 USD ($) | Aug. 18, 2017 USD ($) state | Feb. 28, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Goodwill acquired |  |  | $ 170.3
Lessor Group [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Effective acquisition date |  |  | Feb. 28, 2018
Purchase price | $ 160.6 |  |
Goodwill acquired | $ 119.2 |  |
HR Outsourcing, Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Effective acquisition date |  |  | Aug. 18, 2017
Purchase price |  | $ 75.4 |
Cash portion of purchase price |  | 42.2 |
Common stock issued portion of purchase price |  | 33.2 |
Goodwill acquired |  | $ 51.1 |
HR Outsourcing, Inc. [Member] | Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Number of states in which HR Solutions services are provided | state |  | 35 |

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