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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2017 USD ($) | Feb. 29, 2016 USD ($) | Feb. 28, 2017 USD ($) segment $ / shares | Feb. 29, 2016 USD ($) | May 31, 2016 USD ($)
Accounting Policies [Line Items] |  |  |  |  |
State of incorporation |  |  | Delaware |  |
Number of reportable segments | segment |  |  | 1 |  |
Allowance for doubtful accounts | $ 5.3 |  | $ 5.3 |  | $ 4.2
Accounts receivable, net of allowance for doubtful accounts | 429.9 |  | 429.9 |  | 408.6
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 | 8.9 | $ 8.6 | 26.5 | $ 26.1 |
Excess tax benefit in income tax expense |  |  | $ 17.3 |  |
Diluted earnings per share increase | $ / shares |  |  | $ 0.05 |  |
Trade Receivables [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | 212.5 |  | $ 212.5 |  | 221.6
Purchased Receivables [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 217.4 |  | $ 217.4 |  | $ 187.0
Germany [Member] | Total Revenue [Member] | Geographic Concentration Risk [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Percentage of total revenue less than one percent |  |  | 1.00% | 1.00% |

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