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Organization - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 30, 2016 | Apr. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 15, 2016 | Mar. 01, 2016
Common stock shares issued |  | 24,150,000 | 138,049,718 | 65,285,962 | 65,001,037 |  |
Proceeds from issuance of IPO and private placement |  | $ 631.3 |  |  |  |  |
Fund raised with equity financing transaction | $ 150.2 |  |  |  |  |  |
Contributed fund by parent | 75.0 |  |  |  |  |  |
Commitments on remaining funds | $ 75.2 |  |  |  |  |  |
Proceeds from stock sale |  |  |  |  |  | $ 93.2 |
IPO [Member] |  |  |  |  |  |  |
Shares issued |  | 21,000,000 |  |  |  |  |
Shares issued, price per share |  | $ 22.00 |  |  |  |  |
Private Placement [Member] |  |  |  |  |  |  |
Shares issued |  | 4,545,455 |  |  |  |  |
Shares issued, price per share |  | $ 22.00 |  |  |  |  |
Underwriter [Member] |  |  |  |  |  |  |
Stock option exercised |  | 3,150,000 |  |  |  |  |
Foundation Holding LLC [Member] |  |  |  |  |  |  |
Ownership Percentage By Parent |  |  | 100.00% | 100.00% |  |  |
Ceridian Holding and Ceridian Holding II [Member] | Sponsors [Member] |  |  |  |  |  |  |
Ownership percentage by sponsors |  |  | 96.00% | 96.00% |  |  |
Ceridian Holding and Ceridian Holding II [Member] | Other Individuals [Member] |  |  |  |  |  |  |
Minority interest ownership percentage by other |  |  | 4.00% | 4.00% |  |  |
Common Class A [Member] |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  | 10,063,749
Common Class B [Member] |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  | 10,063,749

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