Summary of Significant Accounting Policies	12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The Consolidated Financial Statements include the accounts of LCI Industries and its wholly-owned subsidiaries (“LCII” and collectively with its subsidiaries, the “Company”). LCII has no unconsolidated subsidiaries. LCII, through its wholly-owned subsidiary, Lippert Components, Inc. and its subsidiaries (collectively, “Lippert Components” or “LCI”), supplies, domestically and internationally, a broad array of components for the leading original equipment manufacturers (“OEMs”) of recreational vehicles (“RVs”) and adjacent industries including buses; trailers used to haul boats, livestock, equipment and other cargo; trucks; pontoon boats; trains; manufactured homes; and modular housing. The Company also supplies components to the related aftermarkets of these industries, primarily by selling to retail dealers, wholesale distributors and service centers. At December 31, 2016, the Company operated 48 manufacturing and distribution facilities located throughout the United States and in Canada and Italy. Most industries where the Company sells products or where its products are used historically have been seasonal and are generally at the highest levels when the weather is moderate. Accordingly, the Company’s sales and profits have generally been the highest in the second quarter and lowest in the fourth quarter. However, because of fluctuations in dealer inventories, the impact of international, national and regional economic conditions and consumer confidence on retail sales of RVs and other products for which the Company sells its components, the timing of dealer orders, and the impact of severe weather conditions on the timing of industry-wide shipments from time to time, current and future seasonal industry trends may be different than in prior years. Additionally, sales of components to the aftermarket channels of these industries tend to be counter-seasonal. The Company is not aware of any significant events, except as disclosed in the Notes to Consolidated Financial Statements, which occurred subsequent to the balance sheet date but prior to the filing of this report that would have a material impact on the Consolidated Financial Statements. All significant intercompany balances and transactions have been eliminated. Certain prior year balances have been reclassified to conform to current year presentation. Cash and Cash Equivalents The Company considers all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents. Accounts Receivable Accounts receivable are stated at historical carrying value, net of write-offs and allowances. The Company establishes allowances based upon historical experience and any specific customer collection issues identified by the Company. Uncollectible accounts receivable are written off when a settlement is reached or when the Company has determined the balance will not be collected. Inventories Inventories are stated at the lower of cost (using the first-in, first-out method) or market. Cost includes material, labor and overhead; market is replacement cost or realizable value after allowance for costs of distribution. Fixed Assets Fixed assets which are owned are stated at cost less accumulated depreciation, and are depreciated on a straight-line basis over the estimated useful lives of the properties and equipment. Leasehold improvements and leased equipment are amortized over the shorter of the lives of the leases or the underlying assets. Maintenance and repair costs that do not improve service potential or extend economic life are expensed as incurred. Warranty The Company provides warranty terms based upon the type of product sold. The Company estimates the warranty accrual based upon various factors, including (i) historical warranty costs, (ii) current trends, (iii) product mix, and (iv) sales. The accounting for warranty accruals requires the Company to make assumptions and judgments, and to the extent actual results differ from original estimates, adjustments to recorded accruals may be required. Income Taxes Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax basis of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse. The Company accounts for uncertainty in tax positions by recognizing in its financial statements the impact of a tax position only if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Further, the Company assesses the tax benefits of the tax positions in its financial statements based on experience with similar tax positions, information obtained during the examination process and the advice of experts. The Company recognizes previously unrecognized tax benefits upon the earlier of the expiration of the period to assess tax in the applicable taxing jurisdiction or when the matter is constructively settled and upon changes in statutes or regulations and new case law or rulings. The Company classifies interest and penalties related to income taxes as income tax expense in its Consolidated Financial Statements. Goodwill Goodwill represents the excess of the total consideration given in an acquisition of a business over the fair value of the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but instead is tested at the reporting unit level for impairment annually in November, or more frequently if certain circumstances indicate a possible impairment may exist. In 2016 and 2015, the Company assessed qualitative factors of its reporting units to determine whether it was more likely than not the fair value of the reporting unit was less than its carrying amount, including goodwill. The qualitative impairment test consists of an assessment of qualitative factors, including general economic and industry conditions, market share and input costs. Other Intangible Assets Intangible assets with estimable useful lives are amortized, primarily on an accelerated basis, over their respective estimated useful lives to their estimated residual values, and reviewed for impairment. The amortization of other intangible assets is done using a method, straight-line or accelerated, which best reflects the pattern in which the estimated future economic benefits of the asset will be consumed. The useful lives of intangible assets are determined after considering the expected cash flows and other specific facts and circumstances related to each intangible asset. Impairment of Long-Lived Assets Long-lived assets, other than goodwill, are tested for impairment when changes in circumstances indicate their carrying value may not be recoverable. A determination of impairment, if any, is made based on the undiscounted value of estimated future cash flows, salvage value or expected net sales proceeds, depending on the circumstances. Impairment is measured as the excess of the carrying value over the estimated fair value of such assets. Asset Retirement Obligations Asset retirement obligations are legal obligations associated with the retirement of long-lived assets. The Company records asset retirement obligations on certain of its owned and leased facilities and leased machinery and equipment. These liabilities are initially recorded at fair value and are adjusted for changes resulting from revisions to the timing or the amount of the original estimate. Environmental Liabilities Accruals for environmental matters are recorded when it is probable a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against potentially responsible third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available. Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies and remedial activities, advances in technology, changes in environmental laws and regulations and their application, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other potentially responsible parties and the Company’s ability to obtain contributions from other parties, and the lengthy time periods over which site remediation occurs. It is possible some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably against the Company, and could materially affect operating results when resolved in future periods. Foreign Currency Translation The “functional currency” of the Company’s subsidiaries in Italy is the respective local currency. The translation from the applicable foreign currency to U.S. Dollars is performed for balance sheet accounts using exchange rates in effect at the balance sheet date and for revenue and expense accounts using the weighted average exchange rate for the period. The resulting translation adjustments are recorded as a component of Accumulated Other Comprehensive Income (Loss). Financial Instruments The carrying values of cash and cash equivalents, accounts receivable and accounts payable approximated their fair value due to the short-term nature of these instruments. Stock-Based Compensation All stock-based compensation awards are expensed over their vesting period, based on fair value. For awards having a service-only vesting condition, the Company recognizes stock-based compensation expense on a straight-line basis over the requisite service periods. For awards with a performance vesting condition, which are subject to certain pre-established performance targets, the Company recognizes stock-based compensation expense on a graded-vesting basis to the extent it is probable the performance targets will be met. The fair value for stock options is determined using the Black-Scholes option-pricing model, while the fair values of deferred stock units, restricted stock units, restricted stock and stock awards are based on the market price of the Company’s Common Stock, all on the date the stock-based awards are granted. Revenue Recognition The Company recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collectability is reasonably assured, and the sales price is fixed or determinable. Sales taxes collected from customers and remitted to governmental authorities, which are not significant, are accounted for on a net basis and therefore are excluded from net sales in the Consolidated Statements of Income. Shipping and Handling Costs The Company records shipping and handling costs within selling, general and administrative expenses. Such costs aggregated $51.8 million, $45.8 million and $40.9 million in the years ended December 31, 2016, 2015 and 2014, respectively. Legal Costs The Company expenses all legal costs associated with litigation as incurred. Legal expenses are included in selling, general and administrative expenses in the Consolidated Statements of Income. Fair Value Measurements Fair value is determined using a hierarchy that has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant unobservable inputs. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, net sales and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including, but not limited to, those related to product returns, sales and purchase rebates, accounts receivable, inventories, goodwill and other intangible assets, net assets of acquired businesses, income taxes, warranty and product recall obligations, self-insurance obligations, lease terminations, asset retirement obligations, long-lived assets, post-retirement benefits, stock-based compensation, segment allocations, contingent consideration, environmental liabilities, contingencies and litigation. The Company bases its estimates on historical experience, other available information and various other assumptions believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities not readily apparent from other resources. Actual results and events could differ significantly from management estimates.

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The Consolidated Financial Statements include the accounts of LCI Industries and its wholly-owned subsidiaries (“LCII” and collectively with its subsidiaries, the “Company”). LCII has no unconsolidated subsidiaries. LCII, through its wholly-owned subsidiary, Lippert Components, Inc. and its subsidiaries (collectively, “Lippert Components” or “LCI”), supplies, domestically and internationally, a broad array of components for the leading original equipment manufacturers (“OEMs”) of recreational vehicles (“RVs”) and adjacent industries including buses; trailers used to haul boats, livestock, equipment and other cargo; trucks; pontoon boats; trains; manufactured homes; and modular housing. The Company also supplies components to the related aftermarkets of these industries, primarily by selling to retail dealers, wholesale distributors and service centers. At December 31, 2016, the Company operated 48 manufacturing and distribution facilities located throughout the United States and in Canada and Italy.

Most industries where the Company sells products or where its products are used historically have been seasonal and are generally at the highest levels when the weather is moderate. Accordingly, the Company’s sales and profits have generally been the highest in the second quarter and lowest in the fourth quarter. However, because of fluctuations in dealer inventories, the impact of international, national and regional economic conditions and consumer confidence on retail sales of RVs and other products for which the Company sells its components, the timing of dealer orders, and the impact of severe weather conditions on the timing of industry-wide shipments from time to time, current and future seasonal industry trends may be different than in prior years. Additionally, sales of components to the aftermarket channels of these industries tend to be counter-seasonal.

The Company is not aware of any significant events, except as disclosed in the Notes to Consolidated Financial Statements, which occurred subsequent to the balance sheet date but prior to the filing of this report that would have a material impact on the Consolidated Financial Statements. All significant intercompany balances and transactions have been eliminated. Certain prior year balances have been reclassified to conform to current year presentation.

Cash and Cash Equivalents

The Company considers all highly liquid investments with a maturity of three months or less at the time of purchase to be cash equivalents.

Accounts Receivable

Accounts receivable are stated at historical carrying value, net of write-offs and allowances. The Company establishes allowances based upon historical experience and any specific customer collection issues identified by the Company. Uncollectible accounts receivable are written off when a settlement is reached or when the Company has determined the balance will not be collected.

Inventories

Inventories are stated at the lower of cost (using the first-in, first-out method) or market. Cost includes material, labor and overhead; market is replacement cost or realizable value after allowance for costs of distribution.

Fixed Assets

Fixed assets which are owned are stated at cost less accumulated depreciation, and are depreciated on a straight-line basis over the estimated useful lives of the properties and equipment. Leasehold improvements and leased equipment are amortized over the shorter of the lives of the leases or the underlying assets. Maintenance and repair costs that do not improve service potential or extend economic life are expensed as incurred.

Warranty

The Company provides warranty terms based upon the type of product sold. The Company estimates the warranty accrual based upon various factors, including (i) historical warranty costs, (ii) current trends, (iii) product mix, and (iv) sales. The accounting for warranty accruals requires the Company to make assumptions and judgments, and to the extent actual results differ from original estimates, adjustments to recorded accruals may be required.

Income Taxes

Deferred tax assets and liabilities are determined based on the temporary differences between the financial reporting and tax basis of assets and liabilities, applying enacted statutory tax rates in effect for the year in which the differences are expected to reverse.

The Company accounts for uncertainty in tax positions by recognizing in its financial statements the impact of a tax position only if that position is more likely than not of being sustained on audit, based on the technical merits of the position. Further, the Company assesses the tax benefits of the tax positions in its financial statements based on experience with similar tax positions, information obtained during the examination process and the advice of experts. The Company recognizes previously unrecognized tax benefits upon the earlier of the expiration of the period to assess tax in the applicable taxing jurisdiction or when the matter is constructively settled and upon changes in statutes or regulations and new case law or rulings.

The Company classifies interest and penalties related to income taxes as income tax expense in its Consolidated Financial Statements.

Goodwill

Goodwill represents the excess of the total consideration given in an acquisition of a business over the fair value of the net tangible and identifiable intangible assets acquired. Goodwill is not amortized, but instead is tested at the reporting unit level for impairment annually in November, or more frequently if certain circumstances indicate a possible impairment may exist. In 2016 and 2015, the Company assessed qualitative factors of its reporting units to determine whether it was more likely than not the fair value of the reporting unit was less than its carrying amount, including goodwill. The qualitative impairment test consists of an assessment of qualitative factors, including general economic and industry conditions, market share and input costs.

Other Intangible Assets

Intangible assets with estimable useful lives are amortized, primarily on an accelerated basis, over their respective estimated useful lives to their estimated residual values, and reviewed for impairment. The amortization of other intangible assets is done using a method, straight-line or accelerated, which best reflects the pattern in which the estimated future economic benefits of the asset will be consumed. The useful lives of intangible assets are determined after considering the expected cash flows and other specific facts and circumstances related to each intangible asset.

Impairment of Long-Lived Assets

Long-lived assets, other than goodwill, are tested for impairment when changes in circumstances indicate their carrying value may not be recoverable. A determination of impairment, if any, is made based on the undiscounted value of estimated future cash flows, salvage value or expected net sales proceeds, depending on the circumstances. Impairment is measured as the excess of the carrying value over the estimated fair value of such assets.

Asset Retirement Obligations

Asset retirement obligations are legal obligations associated with the retirement of long-lived assets. The Company records asset retirement obligations on certain of its owned and leased facilities and leased machinery and equipment. These liabilities are initially recorded at fair value and are adjusted for changes resulting from revisions to the timing or the amount of the original estimate.

Environmental Liabilities

Accruals for environmental matters are recorded when it is probable a liability has been incurred and the amount of the liability can be reasonably estimated, based upon current law and existing technologies. These amounts, which are not discounted and are exclusive of claims against potentially responsible third parties, are adjusted periodically as assessment and remediation efforts progress or additional technical or legal information becomes available. Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies and remedial activities, advances in technology, changes in environmental laws and regulations and their application, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other potentially responsible parties and the Company’s ability to obtain contributions from other parties, and the lengthy time periods over which site remediation occurs. It is possible some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably against the Company, and could materially affect operating results when resolved in future periods.

Foreign Currency Translation

The “functional currency” of the Company’s subsidiaries in Italy is the respective local currency. The translation from the applicable foreign currency to U.S. Dollars is performed for balance sheet accounts using exchange rates in effect at the balance sheet date and for revenue and expense accounts using the weighted average exchange rate for the period. The resulting translation adjustments are recorded as a component of Accumulated Other Comprehensive Income (Loss).

Financial Instruments

The carrying values of cash and cash equivalents, accounts receivable and accounts payable approximated their fair value due to the short-term nature of these instruments.

Stock-Based Compensation

All stock-based compensation awards are expensed over their vesting period, based on fair value. For awards having a service-only vesting condition, the Company recognizes stock-based compensation expense on a straight-line basis over the requisite service periods. For awards with a performance vesting condition, which are subject to certain pre-established performance targets, the Company recognizes stock-based compensation expense on a graded-vesting basis to the extent it is probable the performance targets will be met. The fair value for stock options is determined using the Black-Scholes option-pricing model, while the fair values of deferred stock units, restricted stock units, restricted stock and stock awards are based on the market price of the Company’s Common Stock, all on the date the stock-based awards are granted.

Revenue Recognition

The Company recognizes revenue when products are shipped and the customer takes ownership and assumes risk of loss, collectability is reasonably assured, and the sales price is fixed or determinable. Sales taxes collected from customers and remitted to governmental authorities, which are not significant, are accounted for on a net basis and therefore are excluded from net sales in the Consolidated Statements of Income.

Shipping and Handling Costs

The Company records shipping and handling costs within selling, general and administrative expenses. Such costs aggregated $51.8 million, $45.8 million and $40.9 million in the years ended December 31, 2016, 2015 and 2014, respectively.

Legal Costs

The Company expenses all legal costs associated with litigation as incurred. Legal expenses are included in selling, general and administrative expenses in the Consolidated Statements of Income.

Fair Value Measurements

Fair value is determined using a hierarchy that has three levels based on the reliability of the inputs used to determine fair value. Level 1 refers to fair values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant other observable inputs, and Level 3 includes fair values estimated using significant unobservable inputs.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires the Company to make estimates and judgments that affect the reported amounts of assets, liabilities, net sales and expenses, and related disclosure of contingent assets and liabilities. On an ongoing basis, the Company evaluates its estimates, including, but not limited to, those related to product returns, sales and purchase rebates, accounts receivable, inventories, goodwill and other intangible assets, net assets of acquired businesses, income taxes, warranty and product recall obligations, self-insurance obligations, lease terminations, asset retirement obligations, long-lived assets, post-retirement benefits, stock-based compensation, segment allocations, contingent consideration, environmental liabilities, contingencies and litigation. The Company bases its estimates on historical experience, other available information and various other assumptions believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities not readily apparent from other resources. Actual results and events could differ significantly from management estimates.