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Service Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Service Revenue [Line Items] |  |  |  |
Contracts term |  |  | 30 days |
Notice of termination period |  |  | 30 days |
Direct pass-through costs for payroll wages and payroll taxes | $ 5,600.0 | $ 4,700.0 | $ 15,900.0 | $ 9,200.0
Direct pass-through costs related to state unemployment insurance | 47.2 | 46.3 | 73.9 | 59.7
Direct pass-through costs related to guaranteed cost benefit plans | $ 159.0 | $ 139.4 | $ 489.8 | 294.5
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 years to four years |
Capitalized contract cost, amortization period | 8 years |  | 8 years |
Impairment loss |  |  | $ 0.0 | $ 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 Customer Contract Termination Notice Days + References No definition available. + Details
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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 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 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130554-203045 + Details
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