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Leases - Future Minimum Lease Payments Under Operating and Financing Leases (Parenthetical) (Detail) $ in Millions | Dec. 31, 2020 USD ($)
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Leases [Abstract] |
Minimum sublease rentals under noncancellable subleases | $ 6.5

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- Definition Minimum sublease rentals under noncancallable subleases. + References No definition available. + Details
Name: | cday_MinimumSubleaseRentalsUnderNoncancallableSubleases
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration