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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 28, 2021 USD ($) item | Feb. 28, 2021 USD ($) item | Feb. 29, 2020 USD ($) item | Feb. 28, 2021 USD ($) item segment | Feb. 29, 2020 USD ($) item | May 31, 2021 USD ($) | May 31, 2020 USD ($) item
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  | 1 |  |  |
Allowance for doubtful accounts | $ 20.3 | $ 20.3 |  | $ 20.3 |  |  | $ 12.5
Advance collections | 3.8 | 3.8 |  | 3.8 |  |  | 6.1
Maximum individual health insurance claims liability |  |  |  |  |  |  | 0.3
Stock-based compensation expense |  | 12.6 | $ 12.7 | 38.1 | $ 36.5 |  |
Forecast [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  |  | $ 0.3 |
Trade Receivables [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Receivables | 99.3 | 99.3 |  | 99.3 |  |  | 84.7
Purchased Receivables [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Receivables | $ 615.8 | $ 615.8 |  | $ 615.8 |  |  | $ 311.9
Revenue [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of clients creating a credit concentration | item |  | 0 | 0 | 0 | 0 |  |
Concentration percentage |  | 10.00% | 10.00% | 10.00% | 10.00% |  |
Accounts Receivable And Unbilled Receivables [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Number of clients creating a credit concentration | item | 1 |  |  |  |  |  | 0
Concentration percentage | 13.00% |  |  |  |  |  | 10.00%
PEO [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  |  | $ 1.0
PEO [Member] | Forecast [Member] |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 1.0 |

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