Description of Business and Summary of Significant Accounting Policies	3 Months Ended
Mar. 29, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Summary of Significant Accounting Policies	DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Description of Business and Basis of Presentation Our Business Vectrus, Inc. is a leading provider of services to the United States (U.S.) government worldwide. We operate as one segment and offer facility and logistics services and information technology and network communications services. Vectrus was incorporated in the State of Indiana on February 4, 2014. On September 27, 2014, Exelis Inc. (Exelis) completed a spin-off (the Spin-off) of Vectrus, and Vectrus became an independent, publicly traded company. Unless the context otherwise requires, references in these notes to "Vectrus", "we," "us," "our," "the Company" and "our Company" refer to Vectrus, Inc. References in these notes to Exelis or "Former Parent" refer to Exelis Inc. and its consolidated subsidiaries (other than Vectrus). Basis of Presentation Our quarterly financial periods end on the Friday closest to the last day of the calendar quarter (March 29, 2019 for the first quarter of 2019 and March 30, 2018 for the first quarter of 2018), except for the last quarter of the fiscal year, which ends on December 31. For ease of presentation, the quarterly financial statements included herein are described as three months ended. The unaudited interim Condensed Consolidated Financial Statements of Vectrus have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC). Accordingly, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the U.S. (GAAP) have been omitted. These unaudited interim Condensed Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018. It is management’s opinion that these financial statements include all normal and recurring adjustments necessary for a fair presentation of the Company’s financial position and operating results. Net sales and net earnings for any interim period are not necessarily indicative of future or annual results. Leases Beginning with our January 1, 2019 adoption of the new lease accounting standard, operating leases are included on our Condensed Consolidated Balance Sheets as right-of-use (“ROU”) assets, other accrued liabilities and other non-current liabilities. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The incremental borrowing rate as of January 1, 2019 was applied to operating leases in effect as of that date. The operating lease ROU asset also includes any prepaid lease payments and excludes lease incentives. Many of our leases include one or more options to renew or terminate the lease, solely at our discretion. Such options are factored into the lease term when it is reasonably certain that we will exercise the option. Lease expense for lease payments is recognized on a straight-line basis over the lease term. As allowed under ASC Topic 842, we elected the package of practical expedients permitted under the transition guidance which allowed us to carry forward the historical lease classification, assessment of whether a contract was or contained a lease and assessment of initial direct costs. In addition, we have made policy elections to apply the short-term leases practical expedient, whereby leases with a term of twelve months or less are not capitalized and recorded on our balance sheet, and the practical expedient to not separate lease components from nonlease components. The latter expedient is applied to all of our leases. We did not elect to apply the hindsight practical expedient in determining lease terms and assessing impairment of ROU assets. See Note 2,"Recent Accounting Pronouncements" and Note 10,"Leases" for further information. Reclassifications Certain reclassifications have been made to the presentation of amounts in our Condensed Consolidated Statement of Cash Flows for the three months ended March 30, 2018 to conform to the current year presentation. Specifically, depreciation and amortization which were combined and disclosed as one amount are now presented separately.

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business and Basis of Presentation

Our Business

Vectrus, Inc. is a leading provider of services to the United States (U.S.) government worldwide. We operate as one segment and offer facility and logistics services and information technology and network communications services.

Vectrus was incorporated in the State of Indiana on February 4, 2014. On September 27, 2014, Exelis Inc. (Exelis) completed a spin-off (the Spin-off) of Vectrus, and Vectrus became an independent, publicly traded company. Unless the context otherwise requires, references in these notes to "Vectrus", "we," "us," "our," "the Company" and "our Company" refer to Vectrus, Inc. References in these notes to Exelis or "Former Parent" refer to Exelis Inc. and its consolidated subsidiaries (other than Vectrus).

Basis of Presentation

Our quarterly financial periods end on the Friday closest to the last day of the calendar quarter (March 29, 2019 for the first quarter of 2019 and March 30, 2018 for the first quarter of 2018), except for the last quarter of the fiscal year, which ends on December 31. For ease of presentation, the quarterly financial statements included herein are described as three months ended.

The unaudited interim Condensed Consolidated Financial Statements of Vectrus have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (SEC). Accordingly, certain information and footnote disclosures normally included in annual financial statements prepared in accordance with generally accepted accounting principles in the U.S. (GAAP) have been omitted. These unaudited interim Condensed Consolidated Financial Statements should be read in conjunction with our audited Consolidated Financial Statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2018.

It is management’s opinion that these financial statements include all normal and recurring adjustments necessary for a fair presentation of the Company’s financial position and operating results. Net sales and net earnings for any interim period are not necessarily indicative of future or annual results.

Leases

Beginning with our January 1, 2019 adoption of the new lease accounting standard, operating leases are included on our Condensed Consolidated Balance Sheets as right-of-use (“ROU”) assets, other accrued liabilities and other non-current liabilities.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Lease ROU assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The incremental borrowing rate as of January 1, 2019 was applied to operating leases in effect as of that date. The operating lease ROU asset also includes any prepaid lease payments and excludes lease incentives. Many of our leases include one or more options to renew or terminate the lease, solely at our discretion. Such options are factored into the lease term when it is reasonably certain that we will exercise the option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

As allowed under ASC Topic 842, we elected the package of practical expedients permitted under the transition guidance which allowed us to carry forward the historical lease classification, assessment of whether a contract was or contained a lease and assessment of initial direct costs. In addition, we have made policy elections to apply the short-term leases practical expedient, whereby leases with a term of twelve months or less are not capitalized and recorded on our balance sheet, and the practical expedient to not separate lease components from nonlease components. The latter expedient is applied to all of our leases. We did not elect to apply the hindsight practical expedient in determining lease terms and assessing impairment of ROU assets. See Note 2,"Recent Accounting Pronouncements" and Note 10,"Leases" for further information.

Reclassifications

Certain reclassifications have been made to the presentation of amounts in our Condensed Consolidated Statement of Cash Flows for the three months ended March 30, 2018 to conform to the current year presentation. Specifically, depreciation and amortization which were combined and disclosed as one amount are now presented separately.