Revenue - Revenue by Contract Relationship (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 03, 2020 |
Mar. 29, 2019 |
|
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | $ 351,734 | $ 325,906 |
| Prime contractor | ||
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | 333,393 | 307,058 |
| Subcontractor | ||
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | $ 18,341 | $ 18,848 |