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Financial Data by Segment and Geographic Area - Additional Information (Detail) | 6 Months Ended
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Jun. 30, 2018 Segment Employees Service
Segment Reporting Information [Line Items] |
Number of operating segments | 1
Number of reportable segments | 1
Cloud Revenue [Member] |
Segment Reporting Information [Line Items] |
Number of cloud offering delivering solution | 2
Powerpay [Member] | Maximum [Member] |
Segment Reporting Information [Line Items] |
Number of employees generating revenue from recurring fees | Employees | 20
Bureau Revenue [Member] |
Segment Reporting Information [Line Items] |
Number of primary service lines delivering solutions | Service | 3

X
- Definition Number of cloud offering delivering solution. + References No definition available. + Details
Name: | cday_NumberOfCloudOfferingDeliveringSolution
Namespace Prefix: | cday_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of employees generating revenue from recurring fees. + References No definition available. + Details
Name: | cday_NumberOfEmployeesGeneratingRevenueFromRecurringFees
Namespace Prefix: | cday_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of primary service lines delivering solutions. + References No definition available. + Details
Name: | cday_NumberOfPrimaryServiceLinesDeliveringSolutions
Namespace Prefix: | cday_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ProductOrServiceAxis=cday_CloudRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cday_PowerpayMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=cday_BureauRevenueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |