Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies Description of Business Astec Industries, Inc. ("Astec" or the "Company") is a Tennessee corporation which was incorporated in 1972. The Company designs, engineers, manufactures, markets and services equipment and components used primarily in asphalt and concrete road building and related construction activities, as well as other products discussed below. The Company's products are used in each phase of road building, from quarrying and crushing the aggregate to application of the road surface. The Company's product portfolio includes both asphalt and concrete equipment. The Company also manufactures certain equipment and components unrelated to road construction, including equipment for the mining, quarrying, construction, demolition, land clearing, energy, hydro-electric and recycling industries and port and rail yard operators; industrial heat transfer equipment; commercial whole-tree pulpwood chippers; horizontal grinders; blower trucks; commercial and industrial burners; and combustion control systems. The Company operates in two reportable segments - Infrastructure Solutions and Materials Solutions. The Company's two reportable business segments comprise sites based upon the nature of the products produced or services provided, the type of customer for the products, the similarity of economic characteristics, the manner in which management reviews results and the nature of the production process, among other considerations. The Corporate and Other category consists primarily of the parent company and Astec Insurance Company ("Astec Insurance" or the "captive"), a captive insurance company, which do not meet the requirements as an operating segment or inclusion in one of the other reporting segments. Basis of Presentation The accompanying unaudited consolidated financial statements include the accounts of Astec and its subsidiaries and have been prepared by the Company, pursuant to the rules and regulations of the U.S. Securities and Exchange Commission ("SEC"). The Company prepares its financial statements in accordance with generally accepted accounting principles in the United States of America ("U.S. GAAP"). Certain information and footnote disclosures normally included in annual consolidated financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the SEC rules and regulations governing interim financial statements. However, the Company believes that the disclosures made in the unaudited consolidated financial statements and related notes are adequate to make the information presented not misleading. These consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2024. All intercompany balances and transactions between the Company and its affiliates have been eliminated in consolidation. Noncontrolling interest in the Company's consolidated financial statements represents the 7% interest in a consolidated subsidiary which is not owned by the Company. Since the Company controls this subsidiary, the subsidiary's financial statements are consolidated with those of the Company, and the noncontrolling owner's 7% share of the subsidiary's net assets and results of operations is deducted and reported as "Noncontrolling interest" in the Consolidated Balance Sheets and as "Net (income) loss attributable to noncontrolling interest" in the Consolidated Statements of Operations. The Company executed an agreement in February 2022 with the noncontrolling interest holder to acquire their outstanding interest in full for R$10.0M (approximately $2.0 million, subject to the effect of exchange rates). Completion of the transaction is subject to resolution of certain disputes between the parties. The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the consolidated financial statements and accompanying notes. Significant items subject to such estimates and assumptions include excess and obsolete inventory, inventory net realizable value, product warranty obligations, capitalized implementation costs, goodwill and other intangible assets impairment and the measurement of income tax assets and liabilities. The Company bases its estimates on historical experience and on various other assumptions that the Company believes to be reasonable under the circumstances. On an ongoing basis, the Company evaluates these assumptions, judgments and estimates. Actual results could differ from those estimates. In the opinion of management, the consolidated financial statements contain all adjustments necessary for a fair statement of the results of operations and comprehensive (loss) income for the three and nine months ended September 30, 2025 and 2024, the financial position as of September 30, 2025 and December 31, 2024 and the cash flows for the nine months ended September 30, 2025 and 2024, and, except as otherwise discussed herein, such adjustments consist only of those of a normal recurring nature. The interim results are not necessarily indicative of results that may be achieved in a full reporting year. All dollar amounts, except per share amounts, are in millions of dollars unless otherwise indicated. Recently Adopted Accounting Pronouncements In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvement to Reportable Segment Disclosures", which requires entities to disclose significant segment expenses, other segment items, the title and position of the chief operating decision maker ("CODM") and information related to how the CODM assesses segment performance and allocates resources, among certain other required disclosures. Additionally, current annual disclosures will be required in interim periods. The new standard is effective, on a retrospective basis, for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The Company adopted this guidance beginning with the form 10-K filing for the year ended December 31, 2024. See Note 12, Operations by Industry Segment and Geographic Area for additional information on the Company's reportable segments. Recently Issued Accounting Pronouncements Not Yet Adopted In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures," which requires entities to disclose specific categories in the income tax rate reconciliation and provide additional information for reconciling items that meet a specified quantitative threshold. In addition, the new standard requires disclosure of the amount of income taxes paid disaggregated by federal, state and foreign taxes and by jurisdiction for exceeding a specified quantitative threshold. Additionally, income or loss from continuing operations before income tax will be required to be disaggregated between domestic and foreign classifications, and income tax expense will be required to be disaggregated between federal, state and foreign classifications. The new standard is effective for fiscal years beginning after December 15, 2024 on a prospective basis, with retrospective application permitted. The Company is currently evaluating the impact this ASU will have on its financial statement disclosures, but this standard will not impact the Company's results of operations, financial position or cash flows. In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses", which requires entities to disclose specific types of expenses included in the expense captions presented on the face of the income statement, among other disclosures. The new guidance is effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027 on a prospective basis, with retrospective application permitted. The Company is currently evaluating the impact this ASU will have on its financial statement disclosures, but this standard will not impact the Company's results of operations, financial position or cash flows. Recent accounting guidance not discussed above is not applicable, did not have or is not expected to have a material impact on the Company.