Earnings Per Share - Reconciliation of Basic and Diluted Weighted Average Shares Outstanding (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 27, 2015
Mar. 29, 2014
Earnings Per Share [Abstract]    
Anti-dilutive shares not included in diluted EPS (less than) (in shares) 100,000  
Net income $ 4,965 $ 11,235
Weighted average common shares outstanding (in shares) 10,495,000 [1] 10,474,000 [1]
Dilutive effect of share-based compensation outstanding after application of the treasury stock method (in shares) 285,000 0
Diluted weighted average common shares outstanding (in shares) 10,780,000 [1] 10,474,000 [1]
Earnings per share    
Basic (in dollars per share) $ 0.47 [1] $ 1.07 [1]
Diluted (in dollars per share) $ 0.46 [1] $ 1.07 [1]
[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.