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Leases - Maturities of Lease Liabilities (Parenthetical) (Detail) $ in Millions | Mar. 31, 2019 USD ($)
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Leases [Abstract] |
Minimum sublease rentals under noncancallable subleases | $ 11.8

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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