Earnings Per Share - Reconciliation of Basic and Diluted Weighted Average Shares Outstanding (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 26, 2015
Jun. 28, 2014
Jun. 26, 2015
Jun. 28, 2014
Earnings Per Share [Abstract]        
Anti-dilutive shares not included in diluted EPS (less than) (in shares) 100   100  
Net income $ 6,020 $ 6,132 $ 10,985 $ 17,367
Weighted average common shares outstanding (in shares) [1] 10,548 10,474 10,520 10,474
Dilutive effect of share-based compensation outstanding after application of the treasury stock method (in shares) 256 0 269 0
Diluted weighted average common shares outstanding (in shares) [1] 10,804 10,474 10,789 10,474
Earnings per share        
Basic (in dollars per share) [2] $ 0.57 $ 0.59 $ 1.04 $ 1.66
Diluted (in dollars per share) [2] $ 0.56 $ 0.59 $ 1.02 $ 1.66
[1] For periods ended September 27, 2014 and prior, basic and diluted earnings per share are computed using the number of shares of Vectrus common stock outstanding on September 27, 2014, the date on which the Vectrus common stock was distributed to the shareholders of Exelis Inc. For the three and six months ended June 26, 2015, less than 0.1 million shares were not included in diluted EPS due to their anti-dilutive effects.
[2] For periods ended September 27, 2014 and prior, basic and diluted earnings per share are computed using the number of shares of Vectrus common stock outstanding on September 27, 2014, the date on which the Vectrus common stock was distributed to the shareholders of Exelis Inc.