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Service Revenue (Narrative) (Details) | 3 Months Ended
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Aug. 31, 2018
Service Revenue [Abstract] |
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

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- Definition Percentage Worksite Employee Participation Not Retained Risk + References No definition available. + Details
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- Definition Percentage Worksite Employee Participation Retained Risk + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + 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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