Document and Entity Information - shares
 3 Months Ended
Apr. 03, 2020
May 08, 2020
Document and Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Apr. 03, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q1  
Entity Registrant Name Vectrus, Inc.  
Entity Central Index Key 0001601548  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   11,589,801
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business false