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Goodwill and Intangible Assets, Net of Accumulated Amortization (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017 | Dec. 20, 2018
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 1,782.6 | $ 814.0 | [1] | $ 657.1 |
Acquired intangible assets with weighted-average amortization periods | 9 years 8 months 12 days |  |  |  |
Amortization expense | $ 55.8 | $ 21.1 |  | $ 18.1 |
Client Lists [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets with weighted-average amortization periods | 10 years |  |  |  |
Other Intangible Assets [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets with weighted-average amortization periods | 3 years |  |  |  |
Oasis Outsourcing Group Holdings, L.P. [Member] |  |  |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |  |  |
Goodwill |  |  |  |  | $ 972.1
[1] | Amounts have been adjusted to reflect the adoption of ASC Topic 606 and to provide further detail related to certain professional employer organization ("PEO") balances.

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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