XML 62 R48.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Customer Trust Fund - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Investment income from invested customer trust fund included in revenue | $ 16.2 | $ 11.2 | $ 33.8 | $ 22.6
Maturities ranging from one to 120 days [Member] |  |  |  |
Average customer trust funds held in liquidity portfolios, Percentage |  |  | 46.00% |
Maturities ranging from 120 days to10 years [Member] |  |  |  |
Average customer trust funds held in fixed income portfolios, Percentage |  |  | 54.00% |

X
- Definition Average customer trust funds maintained in fixed income portfolios percentage. + References No definition available. + Details
Name: | cday_AverageCustomerTrustFundsMaintainedInFixedIncomePortfoliosPercentage
Namespace Prefix: | cday_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average customer trust funds maintained in liquidity portfolios percentage. + References No definition available. + Details
Name: | cday_AverageCustomerTrustFundsMaintainedInLiquidityPortfoliosPercentage
Namespace Prefix: | cday_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment Income From Invested Customer Trust Fund + References No definition available. + Details
Name: | cday_InvestmentIncomeFromInvestedCustomerTrustFund
Namespace Prefix: | cday_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | cday_PeriodsOfMaturityAxis=cday_MaturityPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cday_PeriodsOfMaturityAxis=cday_MaturityPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |