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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 31, 2018 USD ($) segment | Aug. 31, 2017 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | May 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 01, 2016 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment | 1 |  |  |  |  |  |  |  |  |  |
Stock-based compensation costs recognized | $ 10.9 | $ 8.7 |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  | $ 1.0 |  |  |  | $ 1.3 |  |  |
Maximum individual health insurance claims liability |  |  |  |  | $ 0.3 |  |  |  | $ 0.3 |  |
ASU 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative adjustment to increase stockholder's equity |  |  |  |  |  |  |  |  |  |  | $ 262.9
HR Outsourcing Holdings, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 0.5 |  |  |  | $ 0.5 |
Maximum individual health insurance claims liability |  |  |  |  |  |  | $ 0.3 |  |  |  |
HR Outsourcing Holdings, Inc. [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  | $ 0.3 |  |  |  |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total percentage | 1.00% |  |  |  |  |  |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total percentage |  | 1.00% |  |  |  |  |  |  |  |  |
Europe [Member] | Long Lived Assets [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total percentage | 10.00% |  |  |  |  |  |  | 10.00% |  |  |

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