Commitments and Contingencies	12 Months Ended
Commitments and Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company is involved in claims and lawsuits incidental to our business arising from various matters including commercial disputes, alleged product defect and/or warranty claims, intellectual property matters, personal injury claims, environmental issues, employment and/or workplace-related matters, and various governmental regulations. At December 31, 2019, the range of reasonably possible losses for such matters, taking into consideration our rights in indemnity and recourse to third parties, is $1.1 million to $4.6 million. The Company evaluates its exposure to such claims and suits periodically and establishes accruals for these contingencies when probable losses can be reasonably estimated. At December 31, 2019, total accruals of $3.6 million, including environmental matters described below, are included in accrued liabilities in the accompanying Consolidated Balance Sheet. The Company believes any additional liability from such claims and suits would not be material to its financial position or results of operations. Arcosa is subject to remedial orders and federal, state, local, and foreign laws and regulations relating to the environment. The Company has reserved $1.4 million as of December 31, 2019, included in our total accruals of $3.6 million discussed above, to cover our probable and estimable liabilities with respect to the investigations, assessments, and remedial responses to such matters, taking into account currently available information and our contractual rights to indemnification and recourse to third parties. On July 22, 2019, the Company was served with a breach of contract lawsuit filed by Thomas & Betts Corporation (“T&B”) against the Company and its wholly-owned subsidiary, Trinity Meyer Utility Structures, LLC, now known as Meyer Utility Structures, LLC (“Meyer”), in the Supreme Court of the State of New York, New York County. T&B’s claims relate to responsibility for alleged product warranty claims pursuant to the terms of the Asset Purchase Agreement, dated June 24, 2014, entered into by and between T&B and Meyer (the “APA”) with respect to Meyer’s purchase of certain assets of T&B’s utility structure business. The Company and Meyer subsequently removed the litigation to federal court. The case is currently pending under Case No. 1:19-cv-07829-PAE; Thomas & Betts Corporation, now known as, ABB Installation Products, Inc., Plaintiff, v. Trinity Meyer Utility Structures, LLC, formerly known as McKinley 2014 Acquisition, LLC, and Arcosa, Inc., Defendants; In the United States District Court for the Southern District of New York. The Company and Meyer have filed a motion to dismiss T&B’s claims, and an Answer and Counterclaims against T&B. We intend to vigorously defend ourselves in this matter. Based on the facts and circumstances currently known to the Company, (i) we cannot determine that a loss is probable at this time, and therefore no accrual has been included in the accompanying consolidated financial statements; and (ii) a possible loss is not reasonably estimable. Estimates of liability arising from future proceedings, assessments, or remediation are inherently imprecise. Accordingly, there can be no assurance that we will not become involved in future litigation or other proceedings involving the environment or, if we are found to be responsible or liable in any such litigation or proceeding, that such costs would not be material to the Company. Other commitments Non-cancelable purchase obligations amounted to $168.9 million as of December 31, 2019, of which $110.1 million is for the purchase of raw materials and components, primarily by the Energy Equipment and Transportation Products Groups.