Cover - shares
9 Months Ended
Oct. 02, 2020
Nov. 06, 2020
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Oct. 02, 2020  
Document Transition Report false  
Entity File Number 001-36341  
Entity Registrant Name Vectrus, Inc.  
Entity Incorporation, State or Country Code IN  
Entity Tax Identification Number 38-3924636  
Entity Address, Postal Zip Code 80919  
Entity Address, State or Province CO  
Entity Address, City or Town Colorado Springs,  
Entity Address, Address Line One 2424 Garden of the Gods Road,  
Local Phone Number 591-3600  
City Area Code (719)  
Title of 12(b) Security Common Stock, Par Value $0.01 Per Share  
Trading Symbol VEC  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Amendment Flag false  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001601548  
Current Fiscal Year End Date --12-31  
Entity Common Stock, Shares Outstanding   11,624,568