Note 1. Business Description and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jun. 30, 2017
Summary of Significant Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation: The Consolidated Financial Statements include the accounts of all domestic and foreign subsidiaries. All significant intercompany balances and transactions have been eliminated in the consolidation. On September 30, 2014, the shares of Kimball Electronics Mexico, S.A. de C.V., a wholly owned subsidiary of former Parent, were contributed in a capital transaction to Kimball Electronics Mexico, Inc., a wholly owned subsidiary of Kimball Electronics, Inc. The financial results for Kimball Electronics Mexico, S.A. de C.V. are included in the Consolidated Financial Statements herein for all periods presented. Assets and liabilities were recorded at historical costs or carrying value. The Consolidated Financial Statements include allocations from former Parent for direct costs and indirect costs attributable to the operations of the Company through October 31, 2014, the spin-off date. These allocations were made on a direct usage or cost incurred basis when appropriate, with the remainder allocated using various drivers including average capital deployed, payroll, revenue less material costs, headcount, or other measures. While we believe such allocations are reasonable, the financial statements do not purport to reflect what the results of operations, comprehensive income, equity, or cash flows would have been had the Company operated as a stand-alone public company for the entirety of fiscal year 2015. Note 2 - Related Party Transactions of Notes to Consolidated Financial Statements provides information regarding direct and indirect cost allocations.
Use of Estimates	Use of Estimates: The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the reported amounts included in the Consolidated Financial Statements and related note disclosures. While efforts are made to assure estimates used are reasonably accurate based on management’s knowledge of current events, actual results could differ from those estimates.
Segment Reporting	Segment Information: Kimball Electronics has business units located in the United States, China, Mexico, Poland, Romania, and Thailand. Each of our business units qualifies as an operating segment with its results regularly reviewed by our chief operating decision maker. Our chief operating decision maker is our Chief Executive Officer. Our business units meet the aggregation criteria under the current accounting guidance for segment reporting. As of June 30, 2017, all of our business units operated in the EMS industry with engineering, manufacturing, and supply chain services that provide electronic assemblies and components primarily in automotive, medical, industrial, and public safety applications, all to the specifications and designs of our customers. The nature of the products, the production process, the type of customers, and the methods used to distribute the products, all have similar characteristics. Each of our business units service customers in multiple markets and many of our customers’ programs are manufactured and serviced by multiple business units. Our global processes such as component procurement and customer pricing provide commonality and consistency among the various regions in which we operate. All of our business units have similar long-term economic characteristics. As such, our business units have been aggregated into one reportable segment.
Revenue Recognition	Revenue Recognition: Our net sales are principally from the manufacturing of electronic assemblies built to customer specifications. We recognize revenue when persuasive evidence of an arrangement exists, delivery has occurred, the sales price is fixed or determinable, and collectability is reasonably assured. Delivery is not considered to have occurred until the title and the risk of loss passes to the customer according to the terms of the contract. Title and risk of loss are transferred upon shipment to or receipt at our customers’ locations, or in limited circumstances, as determined by other specific sales terms of the transaction. Shipping and handling fees billed to customers are recorded as sales while the related shipping and handling costs are included in cost of sales. We recognize sales net of applicable sales tax. Based on estimated product returns and price concessions, a reserve for returns and allowances is recorded at the time of the sale, resulting in a reduction of revenue.
Cash and Cash Equivalents	Cash and Cash Equivalents: Cash equivalents consist primarily of highly liquid investments with original maturities of three months or less at the time of acquisition. Cash and cash equivalents consist of bank accounts and money market funds. Bank accounts are stated at cost, which approximates fair value, and money market funds are stated at fair value.
Notes Receivable and Trade Accounts Receivable	Notes Receivable and Trade Accounts Receivable: The Company’s notes receivable and trade accounts receivable are recorded per the terms of the agreement or sale, and accrued interest is recognized when earned. We determine on a case-by-case basis the cessation of accruing interest, the resumption of accruing interest, the method of recording payments received on nonaccrual receivables, and the delinquency status for our limited number of notes receivable. Our policy for estimating the allowance for credit losses on trade accounts receivable and notes receivable includes analysis of such items as aging, credit worthiness, payment history, and historical bad debt experience. Management uses these specific analyses in conjunction with an evaluation of the general economic and market conditions to determine the final allowance for credit losses on the trade accounts receivable and notes receivable. Trade accounts receivable and notes receivable are written off after exhaustive collection efforts occur and the receivable is deemed uncollectible. Our limited amount of notes receivable allows management to monitor the risks, credit quality indicators, collectability, and probability of impairment on an individual basis. Adjustments to the allowance for credit losses are recorded in selling and administrative expenses. In the ordinary course of business, customers periodically negotiate extended payment terms on trade accounts receivable. Customary terms require payment within 30 to 45 days, with any terms beyond 45 days being considered extended payment terms. We may utilize accounts receivable factoring arrangements with third-party financial institutions in order to extend terms for the customer without negatively impacting our cash flow. These arrangements in all cases do not contain recourse provisions which would obligate us in the event of our customers’ failure to pay. Receivables are considered sold when they are transferred beyond the reach of Kimball Electronics and its creditors, the purchaser has the right to pledge or exchange the receivables, and we have surrendered control over the transferred receivables.
Banker's Acceptance Drafts	The Company’s China operation, in limited circumstances, may receive banker’s acceptance drafts from customers as payment for their trade accounts receivable. The banker’s acceptance drafts are non-interest bearing and primarily mature within six months from the origination date. The Company has the ability to sell the drafts at a discount or transfer the drafts in settlement of current accounts payable prior to the scheduled maturity date.
Inventories	Inventories: Inventories are stated at the lower of cost or market value. Cost includes material, labor, and applicable manufacturing overhead. Costs associated with underutilization of capacity are expensed as incurred. Inventories are valued using the first-in, first-out (“FIFO”) method. Inventories are adjusted for excess and obsolete inventory. Evaluation of excess inventory includes such factors as anticipated usage, inventory turnover, inventory levels, and product demand levels. Factors considered when evaluating obsolescence include the age of on-hand inventory and reduction in value due to damage, design changes, or cessation of product lines.
Property, Equipment, and Depreciation	Property, Equipment, and Depreciation: Property and equipment are stated at cost less accumulated depreciation. Depreciation is provided over the estimated useful life of the assets using the straight-line method for financial reporting purposes. Major maintenance activities and improvements are capitalized; other maintenance, repairs, and minor renewals are expensed. Depreciation and expenses for maintenance, repairs, and minor renewals are included in both Cost of Sales and Selling and Administrative Expense on the Consolidated Statements of Income.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets: We perform reviews for impairment of long-lived assets whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable. Impairment is recognized when estimated future cash flows expected to result from the use of the asset and its eventual disposition are less than its carrying amount. When an impairment is identified, the carrying amount of the asset is reduced to its estimated fair value. Assets to be disposed of are recorded at the lower of net book value or fair market value less cost to sell at the date management commits to a plan of disposal.
Goodwill	Goodwill represents the difference between the purchase price and the related underlying tangible and intangible net asset fair values resulting from business acquisitions. Annually, or if conditions indicate an earlier review is necessary, we may assess qualitative factors to determine if it is more likely than not that the fair value is less than its carrying amount and if it is necessary to perform the quantitative two-step goodwill impairment test. We also have the option to bypass the qualitative assessment and proceed directly to performing the first step of the quantitative goodwill impairment test. If the first step is determined to be necessary, we compare the carrying value of the reporting unit to an estimate of the reporting unit’s fair value to identify potential impairment. If the estimated fair value of the reporting unit is less than the carrying value, a second step is performed to determine the amount of potential goodwill impairment. If impaired, goodwill is written down to its estimated implied fair value. Goodwill is assigned to and the fair value is tested at the reporting unit level. The fair value is established primarily using a discounted cash flow analysis and secondarily a market approach utilizing current industry information. The calculation of the fair value of the reporting units considers current market conditions existing at the assessment date.
Impairment or Disposal of Intangible Assets	Intangible assets are reviewed for impairment when events or circumstances indicate that the carrying value may not be recoverable over the remaining lives of the assets.
Other Intangible Assets	Internal-use software is stated at cost less accumulated amortization and is amortized using the straight-line method. During the software application development stage, capitalized costs include external consulting costs, cost of software licenses, and internal payroll and payroll-related costs for employees who are directly associated with a software project. Upgrades and enhancements are capitalized if they result in added functionality which enable the software to perform tasks it was previously incapable of performing. Software maintenance, training, data conversion, and business process reengineering costs are expensed in the period in which they are incurred. Capitalized customer relationships are amortized on estimated attrition rate of customers. We have no intangible assets with indefinite useful lives which are not subject to amortization.
Research and Development	Research and Development: The costs of research and development are expensed as incurred.
Insurance and Self-insurance	Insurance and Self-insurance: We are self-insured up to certain limits for general liability, workers’ compensation, and certain employee health benefits including medical, short-term disability, and dental, with the related liabilities included in the accompanying financial statements. Our policy is to estimate reserves based upon a number of factors including known claims, estimated incurred but not reported claims, and other analyses, which are based on historical information along with certain assumptions about future events. Approximately 20% of the workforce is covered under self-insured medical and short-term disability plans. At June 30, 2017 and 2016, accrued liabilities for self-insurance exposure were $1.4 million and $1.1 million, respectively. We carry external medical and disability insurance coverage for the remainder of our eligible workforce not covered by self-insured plans. Insurance benefits are not provided to retired employees.
Income Taxes	Income Taxes: Through October 31, 2014, the Company was included in the consolidated U.S. federal income tax return of former Parent, as well as certain state tax returns where former Parent filed on a combined basis. The provisions for income taxes for these jurisdictions were determined on a separate return basis and presented as such for all years included in these Consolidated Financial Statements. Deferred income tax assets and liabilities are recognized for the estimated future tax consequences attributable to temporary differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. These assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which the temporary differences are expected to reverse. We evaluate the recoverability of deferred tax assets each quarter by assessing the likelihood of future taxable income and available tax planning strategies that could be implemented to realize our deferred tax assets. If recovery is not likely, we provide a valuation allowance based on our best estimate of future taxable income in the various taxing jurisdictions and the amount of deferred taxes ultimately realizable. Future events could change management’s assessment.
Income Tax Uncertainties	We operate within multiple taxing jurisdictions and are subject to tax audits in these jurisdictions. These audits can involve complex uncertain tax positions, which may require an extended period of time to resolve. A tax benefit from an uncertain tax position may be recognized only if it is more likely than not that the tax position will be sustained on examination by taxing authorities, based on the technical merits of the position. We maintain a liability for uncertain income tax and other tax positions, including accrued interest and penalties on those positions. As tax positions are effectively settled, the tax liability is adjusted accordingly. We recognize interest and penalties related to unrecognized tax benefits in Provision for Income Taxes on the Consolidated Statements of Income.
Concentration of Credit Risk	Concentrations of Credit Risk: We have business and credit risks concentrated in the automotive, medical, industrial, and public safety industries. The Company monitors credit quality and associated risks of notes receivable on an individual basis based on criteria such as financial stability of the party and collection experience in conjunction with general economic and market conditions.
Off-Balance-Sheet Risk	Off-Balance Sheet Risk: Off-balance sheet arrangements are limited to banker’s acceptance drafts transferred with recourse provisions at the Company’s China operation, standby letters of credit, and operating leases entered into in the normal course of business as described in Note 6 - Commitments and Contingent Liabilities of Notes to Consolidated Financial Statements.
Other General Income	Other General Income: Other General Income in fiscal year 2017 consisted of $4.0 million resulting from a payment received related to a class action lawsuit in which Kimball Electronics was a class member. The lawsuit alleged that certain suppliers to the EMS industry conspired over a number of years to raise and fix the prices of electronic components, resulting in overcharges to purchasers of those components. We recorded no Other General Income during fiscal years 2016 and 2015.
Non-operating Income and Expense	Non-operating Income and Expense: Non-operating income and expense include the impact of such items as foreign currency rate movements and related derivative gain or loss, fair value adjustments on supplemental employee retirement plan (“SERP”) investments, bank charges, bargain purchase gain on acquisition, and other miscellaneous non-operating income and expense items that are not directly related to operations. The gain or loss on SERP investments is offset by a change in the SERP liability that is recognized in Selling and Administrative Expense.
Foreign Currency Translation	Foreign Currency Translation: The Company predominantly uses the U.S. dollar and Euro as its functional currencies. Foreign currency assets and liabilities are remeasured into functional currencies at end-of-period exchange rates, except for nonmonetary assets and equity, which are remeasured at historical exchange rates. Revenue and expenses are remeasured at the weighted average exchange rate during the fiscal year, except for expenses related to nonmonetary assets, which are remeasured at historical exchange rates. Gains and losses from foreign currency remeasurement are reported in Non-operating income or expense on the Consolidated Statements of Income. For business units whose functional currency is other than the U.S. dollar, the translation of functional currency statements to U.S. dollar statements uses end-of-period exchange rates for assets and liabilities, weighted average exchange rates for revenue and expenses, and historical rates for equity. The resulting currency translation adjustment is recorded in Accumulated Other Comprehensive Income (Loss), as a component of Share Owners’ Equity.
Derivative Instruments and Hedging Activities	Derivative Instruments and Hedging Activities: Derivative financial instruments are recognized on the balance sheet as assets and liabilities and are measured at fair value. Changes in the fair value of derivatives are recorded each period in earnings or Accumulated Other Comprehensive Income (Loss), depending on whether a derivative is designated and effective as part of a hedge transaction, and if it is, the type of hedge transaction. Hedge accounting is utilized when a derivative is expected to be highly effective upon execution and continues to be highly effective over the duration of the hedge transaction. Hedge accounting permits gains and losses on derivative instruments to be deferred in Accumulated Other Comprehensive Income (Loss) and subsequently included in earnings in the periods in which earnings are affected by the hedged item, or when the derivative is determined to be ineffective. We use derivatives primarily for forward purchases of foreign currency to manage exposure to the variability of cash flows, primarily related to the foreign exchange rate risks inherent in forecasted transactions denominated in foreign currency. Cash receipts and cash payments related to derivative instruments are recorded in the same category as the cash flows from the items being hedged on the Consolidated Statements of Cash Flows. See Note 13 - Derivative Instruments of Notes to Consolidated Financial Statements for more information on derivative instruments and hedging activities.
Stock-Based Compensation	Stock-Based Compensation: As described in Note 9 - Stock Compensation Plans of Notes to Consolidated Financial Statements, the Company maintains the 2014 Stock Option and Incentive Plan, which allows for the issuance of incentive stock options, stock appreciation rights, restricted shares, unrestricted shares, restricted share units, or performance shares and performance units for grant to officers and other key employees, and to members of the Board of Directors who are not employees. The Company established in fiscal year 2017 the Kimball Electronics, Inc. Non-Employee Directors Stock Compensation Deferral Plan (the “Deferral Plan”), which allows Non-Employee Directors to elect to defer all, or a portion of, their retainer fees in stock. The Deferral Plan allows for issuance of up to 1.0 million shares of the Company’s common stock. We recognize the cost resulting from share-based payment transactions using a fair-value-based method. The estimated fair value of outstanding performance shares is based on the stock price at the date of the grant. Stock-based compensation expense is recognized for the portion of the award that is ultimately expected to vest. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.
Emerging Growth Company Reporting Requirements	“Emerging Growth Company” Reporting Requirements: The Company qualifies as an “emerging growth company” as defined in the Jumpstart Our Business Startups Act (the “JOBS Act”). For as long as a company is deemed to be an “emerging growth company,” it may take advantage of specified reduced reporting and other regulatory requirements that are generally unavailable to other public companies. Among other things, we are not required to provide an auditor attestation report on the assessment of the internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”). Section 107 of the JOBS Act also provides that an “emerging growth company” can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected to take advantage of this extended transition period. Our financial statements may therefore not be comparable to those of companies that comply with such new or revised accounting standards.
New Accounting Standards	New Accounting Standards: In March 2016, the Financial Accounting Standards Board (“FASB”) issued guidance on accounting for share-based payment transactions. The objective of this guidance is to simplify certain aspects of the accounting for share-based payment transactions, including the treatment of excess income tax benefits and deficiencies, allowing an election to account for forfeitures as they occur, and classification of excess tax benefits on the statement of cash flows. For public companies, the guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. For as long as we remain an “emerging growth company” the new guidance is effective for our fiscal year 2019 annual financial statements and interim statements in our fiscal year 2020. Early adoption is permitted in any interim or annual period. The Company adopted this guidance effective July 1, 2017. As a result, the Company elected to reverse compensation cost of any forfeited awards when they occur and will classify the cash flows related to excess tax benefits for share-based payment arrangements as cash flows from operating activities prospectively. The adoption of this guidance did not have a material impact on the Company’s financial statements at the time of implementation. Under the new guidance, all excess tax benefits and tax deficiencies will be recognized as income tax expense or benefit in the income statement in the period in which they occur. Excess tax benefits and tax deficiencies will vary based on the stock price of the Company’s common stock on the grant date in relation to the stock price used for valuing the stock-based awards on the award date. In February 2016, the FASB issued guidance on leases. The new guidance requires lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by those leases with terms of more than 12 months. Under the current guidance, only capital leases are recognized on the balance sheet. The new guidance requires additional qualitative and quantitative disclosures. For public companies, the guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. For as long as we remain an “emerging growth company” the new guidance will be effective for our fiscal year 2020 annual financial statements and for interim statements beginning in fiscal year 2021. Early application is permitted. We are currently evaluating the impact of the adoption of this guidance on our consolidated financial statements. In November 2015, the FASB issued guidance on the balance sheet classification of deferred taxes. Under the current guidance, deferred tax liabilities and assets must be separated into current and noncurrent amounts in a classified statement of financial position. The new guidance requires deferred tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The new guidance does not change the requirement that deferred tax liabilities and assets of a tax-paying component of an entity to be offset and presented as a single amount. For public companies, the guidance is effective for financial statements issued for annual periods beginning after December 15, 2017, including interim periods within those annual periods. For as long as we remain an “emerging growth company” the guidance is effective for our fiscal year 2019 annual financial statements and interim periods within our fiscal year 2020 financial statements, with earlier application permitted as of the beginning of an interim or annual reporting period. The guidance offers two acceptable adoption methods: (i) retrospective adoption to all periods presented; or (ii) prospective adoption to all deferred tax liabilities and assets. We do not expect the adoption of this standard to have a material effect on our financial position, results of operations, or cash flows. In July 2015, the FASB issued guidance on Simplifying the Measurement of Inventory. The guidance amends the subsequent measurement of inventory from the lower of cost or market to the lower of cost and net realizable value. Under the current guidance, market value could be replacement cost, net realizable value, or net realizable value less an approximately normal profit margin. Within the scope of the new guidance, an entity should measure inventory at the lower of cost and net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. For public companies, the guidance is effective for fiscal years beginning after December 15, 2016, including interim periods within those fiscal years. For as long as we remain an “emerging growth company” the guidance is effective for our fiscal year 2018 annual financial statements and for interim statements beginning in fiscal year 2019. Early application is permitted as of the beginning of an interim or annual reporting period. We do not expect the adoption of this standard to have a material effect on our financial position, results of operations, or cash flows. In May 2014, the FASB issued guidance on the recognition of revenue from contracts with customers. The core principle of the guidance is that a company should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration which the company expects to receive in exchange for those goods or services. To achieve this core principle, the guidance provides a five-step analysis of transactions to determine when and how revenue is recognized. The guidance addresses several areas including transfer of control, contracts with multiple performance obligations, and costs to obtain and fulfill contracts. The guidance also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. In August 2015, the FASB issued additional guidance deferring the effective date for one year while allowing entities the option to adopt one year early. For public companies, the guidance is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that annual reporting period. For as long as we remain an “emerging growth company” the guidance will be effective for our fiscal year 2020 annual financial statements and for interim periods beginning in fiscal year 2021. The Company continues to evaluate the impact the adoption of this new standard will have on its consolidated financial statements; however, it anticipates, for the majority of its contracts for manufacturing services, it will change from a point-in-time recognition method upon transfer of title to an over-time model based on the progress of completing customer orders. We believe the adoption of the standard will have a material effect on the Company’s consolidated financial statements primarily from the recognition of contract assets for unbilled receivables and a corresponding reduction in inventories. Under the guidance there are two acceptable adoption methods: (i) retrospective adoption to each prior reporting period presented with the option to elect certain practical expedients; or (ii) adoption with the cumulative effect of initially applying the guidance recognized at the date of initial application and providing certain additional disclosures. We have not yet finalized our selection of a transition method for adoption.