Description of Business and Summary of Significant Accounting Policies - Summary of Cumulative Catch-Up Adjustments (Details) - Contracts Accounted for under Percentage of Completion - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 26, 2015 |
Jun. 28, 2014 |
Jun. 26, 2015 |
Jun. 28, 2014 |
|
| Concentration Risk [Line Items] | ||||
| Favorable adjustments | $ 2,607 | $ 0 | $ 5,443 | $ 3,571 |
| Unfavorable adjustments | (3,799) | (2,981) | (5,572) | (3,772) |
| Net adjustments | $ (1,192) | $ (2,981) | $ (129) | $ (201) |