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Service Revenue (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2018 | Nov. 30, 2018
Service Revenue [Line Items] |  |
Percentage of client worksite employees participation in benefit plans not retained risk |  | 60.00%
Percentage of client worksite employees participation in benefit plans retained risk |  | 40.00%
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
Deferral of revenue | $ 6.8 | $ 13.6
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
Remainder Of Fiscal 2019 [Member] |  |
Service Revenue [Line Items] |  |
Deferral of revenue |  | $ 12.8
Fiscal Year Ended May 31, 2020 [Member] |  |
Service Revenue [Line Items] |  |
Deferral of revenue |  | 18.5
Thereafter [Member] |  |
Service Revenue [Line Items] |  |
Deferral of revenue |  | $ 14.7

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- Definition Percentage Worksite Employee Participation Retained Risk + References No definition available. + 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 Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + 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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