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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 30, 2021 USD ($) item | Nov. 30, 2020 USD ($) item | Nov. 30, 2021 USD ($) item segment | Nov. 30, 2020 USD ($) item | May 31, 2022 USD ($) | May 31, 2021 USD ($) item
Accounting Policies [Line Items] |  |  |  |  |  |
Number of reportable segments | segment |  |  | 1 |  |  |
Allowance for credit losses | $ 18.0 |  | $ 18.0 |  |  | $ 16.0
Advance collections | 3.4 |  | 3.4 |  |  | 2.5
Maximum individual health insurance claims liability |  |  |  |  |  | 0.3
Stock-based compensation costs recognized | 14.0 | $ 12.2 | 26.4 | $ 25.5 |  |
Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Maximum individual health insurance claims liability |  |  |  |  | $ 0.5 |
Trade Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Receivables | 111.8 |  | 111.8 |  |  | 98.4
Purchased Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Receivables | $ 723.2 |  | $ 723.2 |  |  | $ 495.9
Accounts And Unbilled Receivables [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of clients creating a credit concentration | item |  |  | 0 |  |  | 0
Revenue [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of clients creating a credit concentration | item | 0 | 0 | 0 | 0 |  |
PEO [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  |  | $ 1.0
PEO [Member] | Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Individual workers' compensation claims liability |  |  |  |  | 1.0 |
PEO Aggregate Claims Exceeding $1.0M [Member] | Minimum [Member] | Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Individual workers' compensation claims liability |  |  |  |  | 1.0 |
PEO Aggregate Claims Exceeding $1.0M [Member] | Maximum [Member] | Forecast [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Maximum individual workers' compensation claims liability |  |  |  |  | $ 2.0 |

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