Revenue - Revenue by Contract Type (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 03, 2020 |
Mar. 29, 2019 |
|
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | $ 351,734 | $ 325,906 |
| Cost-plus and cost-reimbursable | ||
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | 256,319 | 251,456 |
| Firm-fixed-price | ||
| Disaggregation of Revenue [Line Items] | ||
| Total revenue | $ 95,415 | $ 74,450 |