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Service Revenue (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2019 | May 31, 2018 | May 31, 2017
Service Revenue [Line Items] |  |  |
Direct pass-through costs for payroll wages and payroll taxes | $ 14.5 | $ 7.7 | $ 5.7
Direct pass-through costs related to state unemployment insurance | 82.3 | 47.5 | 34.0
Direct pass-through costs related to guaranteed cost benefit plans | $ 451.8 | $ 274.2 | $ 224.8
Revenue performance obligations timing | the Company defers revenue associated with these performance obligations, which exceed one year, and subsequently recognizes these as future services are provided, over approximately three to four years |  |
Capitalized contract cost, amortization period | 8 years |  |
Impairment loss | $ 0.0 |  |
Minimum [Member] |  |  |
Service Revenue [Line Items] |  |  |
Revenue performance obligations timing, years | 3 years |  |
Maximum [Member] |  |  |
Service Revenue [Line Items] |  |  |
Revenue performance obligations timing, years | 4 years |  |

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- Definition Direct Pass Through Cost Guaranteed Cost Benefit Plans + References No definition available. + Details
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- Definition Direct Pass Through Cost Payroll Wages And Taxes Including Federal And State Unemployment Insurance + References No definition available. + Details
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- Definition Direct Pass Through Cost State Unemployment Insurance + References No definition available. + Details
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- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131251-203054 + Details
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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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- Definition Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130554-203045 + Details
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