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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) | Mar. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Feb. 28, 2017 USD ($) | Feb. 28, 2018 USD ($) segment | Feb. 28, 2017 USD ($) | May 31, 2017 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  | 1 |  |
Other current liabilities related to termination of license agreements | $ 32.6 |  | $ 32.6 |  | $ 32.6 |  |
Cost related to termination of license agreement |  |  | 24.7 |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  | 1.3 |  | $ 1.3
Maximum individual health insurance claims liability |  |  |  |  | 0.3 |  | $ 0.3
Stock-based compensation costs recognized |  |  | $ 10.3 | $ 8.9 | $ 29.4 | $ 26.5 |
Subsequent Event [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Cost expected to acquire rights to client lists |  | $ 30.0 |  |  |  |  |
Europe [Member] | Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Total percentage |  |  | 1.00% | 1.00% | 1.00% | 1.00% |
Europe [Member] | Long Lived Assets [Member] | Geographic Concentration Risk [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Total percentage | 13.00% |  |  |  |  |  |

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