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Retirement and Other Benefit Plans - Additional Information (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 15, 2019 | Apr. 03, 2019 | Sep. 30, 2019 | Sep. 28, 2018 | Sep. 30, 2019 | Sep. 28, 2018 | Dec. 31, 2018
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Shares fully vested, Description |  |  |  |  | Shares allocated to a participant’s account are fully vested after six years of credited service, or in the event(s) of reaching age 65, death or disability while an active employee of the Company. |  |
Shares fully vested after credited service |  |  |  |  | 6 years |  |
Company's stock held by ESOP |  |  | 78,138,602 |  | 78,138,602 |  | 78,172,809
ESOP shares aggregate redemption, value |  |  | $ 2,600,000,000 |  | $ 2,600,000,000 |  | $ 1,900,000,000
Dividends payment, date | May 08, 2019 |  |  |  |  |  |
Dividends declared amount |  |  |  |  |  |  | 0
Other Noncurrent Assets |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Defined benefit pension plan, net assets position |  |  | 1,700,000 |  | 1,700,000 |  | $ 1,700,000
Board of Directors |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Common stock dividend ratio | 2 |  |  |  |  |  |
Common stock dividend date | May 07, 2019 |  |  |  |  |  |
Initial public offering date | May 08, 2019 |  |  |  |  |  |
Common stock dividend payment date | May 08, 2019 |  |  |  |  |  |
IPO | Board of Directors |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Dividends payable, amount per share |  | $ 2.00 |  |  |  |  |
Dividends payable |  | $ 52,100,000 |  |  |  |  |
Dividends payment, date |  | May 10, 2019 |  |  |  |  |
Direct Costs of Contracts and Indirect, General and Administrative Expense |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
ESOP contribution expense |  |  | $ 12,300,000 | $ 11,400,000 | $ 36,800,000 | $ 34,100,000 |

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