Service Revenue (Summary of Disaggregates Revenue by Services) (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
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Nov. 30, 2018 |
Nov. 30, 2017 |
[1] | Nov. 30, 2018 |
Nov. 30, 2017 |
[1] | |||
| Disaggregation of Revenue [Line Items] | ||||||||
| Total service revenue | $ 840.6 | $ 789.0 | $ 1,686.3 | $ 1,568.2 | ||||
| Management Solutions [Member] | ||||||||
| Disaggregation of Revenue [Line Items] | ||||||||
| Total service revenue | 685.4 | 653.5 | 1,373.1 | 1,319.4 | ||||
| PEO And Insurance Services [Member] | ||||||||
| Disaggregation of Revenue [Line Items] | ||||||||
| Total service revenue | $ 155.2 | $ 135.5 | $ 313.2 | $ 248.8 | ||||
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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