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Description of Business, Basis of Presentation, and Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2016 USD ($) segment $ / shares | May 31, 2015 USD ($) | May 31, 2014 USD ($) | Jul. 07, 2016 $ / shares
Accounting Policies [Line Items] |  |  |  |
Number of reportable segments | segment | 1 |  |  |
Maximum period in which payroll taxes will be remitted after receipt of collections from clients | 90 days |  |  |
Declared date | Jul. 07, 2016 |  |  |
Quarterly dividend per share | $ / shares | $ 0.42 |  |  |
Payable date | Aug. 25, 2016 |  |  |
Record date | Aug. 01, 2016 |  |  |
Allowance for doubtful accounts | $ 4.2 | $ 1.4 |  |
Accounts receivable, net of allowance for doubtful accounts | 408.6 | 176.6 |  |
Goodwill | 657.1 | 561.5 |  |
Goodwill impairment loss | 0.0 | 0.0 | $ 0.0 |
Direct pass-through costs | 5,100.0 | 4,200.0 | $ 3,400.0 |
Maximum individual workers' compensation claims liability | 1.3 | 1.0 |  |
Workers' compensation insurance costs in current liabilities | 13.8 | 11.3 |  |
Workers' compensation insurance costs in long-term liabilities | 18.4 | 15.3 |  |
Maximum individual health insurance claims liability | 0.3 | 0.3 |  |
PEO accrued health insurance reserves in current liabilities | 9.5 | 8.1 |  |
Reserve for uncertain tax positions | $ 54.2 | 29.1 |  |
Software Development [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 15 years |  |  |
Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Period in which payroll taxes are typically remitted after receipt of collections from clients | 1 day |  |  |
Payroll funding fees average collection period | 45 days |  |  |
Amortization period | 3 years |  |  |
Minimum [Member] | Software [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Period in which payroll taxes are typically remitted after receipt of collections from clients | 30 days |  |  |
Payroll funding fees average collection period | 60 days |  |  |
Amortization period | 12 years |  |  |
Maximum [Member] | Software [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 5 years |  |  |
Trade Receivables [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 221.6 | $ 176.6 |  |
Purchased Receivables [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Accounts receivable, net of allowance for doubtful accounts | $ 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% | 1.00% |
Subsequent Event [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Quarterly dividend per share increase | $ / shares |  |  |  | $ 0.04
Quarterly dividend percentage increase |  |  |  | 10.00%
Quarterly dividend per share | $ / shares |  |  |  | $ 0.46

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