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v3.20.1

Subsequent Events - Additional Information (Detail) | May 06, 2020
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Excelity Global Solutions Pte. Ltd. [Member] | Subsequent Event [Member] |
Subsequent Event [Line Items] |
Percentage of outstanding shares to be purchased | 100.00%

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- Definition Percentage of outstanding shares to be acquired. + References No definition available. + Details
Name: | cday_PercentageOfOutstandingSharesToBeAcquired
Namespace Prefix: | cday_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=cday_ExcelityGlobalSolutionsPrivateLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |