Basis of Presentation - New Enviri (Policies)	3 Months Ended
Mar. 31, 2026
Basis of Presentation [Line Items]
Basis of Presentation	Basis of Presentation The Company has prepared these unaudited condensed consolidated financial statements in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the SEC. Accordingly, the unaudited Condensed Consolidated Financial Statements do not include all information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2025 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2025 audited consolidated financial statements. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, included in New Enviri's Information Statement (the "Information Statement"), dated May 8, 2026, attached as Exhibit 99.1 to New Enviri's Current Report on Form 8-K furnished to the SEC on May 11, 2026. In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in these unaudited Condensed Consolidated Financial Statements. As used in this section, the term the “Company” means Enviri Corporation, a Delaware corporation, and its direct and indirect subsidiaries prior to the completion of the Holding Company Merger.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards were adopted during the three months ended March 31, 2026: The Company adopted a change issued by the FASB that provides an optional practical expedient for estimating future credit losses on current accounts receivable and current contract assets that arise from certain contracts with customers. The adoption of this change did not have a material impact on the Company's financial statements. The Company adopted changes issued by the FASB, which required greater disaggregation of income tax disclosures, related to the income tax rate reconciliation and income taxes paid for each annual reporting period. The Company applied the new disclosure requirements prospectively to its annual report for the year ended December 31, 2025.The adoption of these changes did not have a material impact on the Company's consolidated financial statements. The following accounting standards have been issued and become effective for the Company at a future date: In December 2025, the FASB issued an update that provides authoritative guidance on the recognition, measurement and presentation of government grants received by business entities. This update defines government grants and establishes recognition criteria and disclosure requirements. This update becomes effective starting with the Company's annual financial statements for the year ended December 31, 2028 and includes the interim periods within each annual reporting period. Early adoption is permitted. The Company is currently evaluating the impact that this update will have on the Company's financial statements. In November 2024, the FASB issued changes which require disaggregated disclosure of income statement expenses within the footnotes to the financial statement for each interim and annual reporting period. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2027 and will be in effect for the Company's interim financial statements after December 31, 2027. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. The Company is currently evaluating the impact that this change will have on the Company's disclosures.
New Enviri
Basis of Presentation [Line Items]
Basis of Presentation	Basis of Presentation New Enviri has prepared these unaudited Condensed Combined Financial Statements as of May 11, 2026 and in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the SEC. Accordingly, the unaudited Condensed Combined Financial Statements do not include all information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2025 Condensed Combined Balance Sheets information contained in this Quarterly Report on Form 10-Q was derived from the 2025 audited Combined Financial Statements. These unaudited Condensed Combined Financial Statements should be read in conjunction with the audited combined financial statements, including the notes thereto, included in New Enviri's Information Statement (the "Information Statement"), dated May 8, 2026, attached as Exhibit 99.1 to New Enviri's Current Report on Form 8-K furnished to the SEC on May 11, 2026. In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in these unaudited Condensed Combined Financial Statements. The operations comprising New Enviri are in two segments – HE and Rail, all of which are wholly owned by Enviri. Accordingly, Enviri’s net investment in these operations is shown in lieu of stockholders' equity in the Condensed Combined Financial Statements.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards were adopted during the three months ended March 31, 2026: New Enviri adopted a change issued by the FASB that provides an optional practical expedient for estimating future credit losses on current accounts receivable and current contract assets that arise from certain contracts with customers. The adoption of this change did not have a material impact on New Enviri's financial statements. New Enviri adopted changes issued by the FASB, which required greater disaggregation of income tax disclosures, related to the income tax rate reconciliation and income taxes paid for each annual reporting period. New Enviri applied the new disclosure requirements prospectively to its audited combined financial statements in the Information Statement for the year ended December 31, 2025.The adoption of these changes did not have a material impact on New Enviri’s combined financial statements. The following accounting standards have been issued and become effective for New Enviri at a future date: In December 2025, the FASB issued an update that provides authoritative guidance on the recognition, measurement and presentation of government grants received by business entities. This update defines government grants and establishes recognition criteria and disclosure requirements. This update becomes effective starting with New Enviri's annual financial statements for the year ended December 31, 2028 and includes the interim periods within each annual reporting period. Early adoption is permitted. New Enviri is currently evaluating the impact that this update will have on New Enviri's financial statements. In November 2024, the FASB issued changes which require disaggregated disclosure of income statement expenses within the footnotes to the financial statement for each interim and annual reporting period. The changes become effective starting with New Enviri's annual financial statements for the year ended December 31, 2027 and will be in effect for New Enviri's interim financial statements after December 31, 2027. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. New Enviri is currently evaluating the impact that this change will have on its disclosures.

Basis of Presentation - New Enviri (Policies)

3 Months Ended

Mar. 31, 2026

The Company has prepared these unaudited condensed consolidated financial statements in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the SEC. Accordingly, the unaudited Condensed Consolidated Financial Statements do not include all information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2025 Condensed Consolidated Balance Sheet information contained in this Quarterly Report on Form 10-Q was derived from the 2025 audited consolidated financial statements. These unaudited Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, included in New Enviri's Information Statement (the "Information Statement"), dated May 8, 2026, attached as Exhibit 99.1 to New Enviri's Current Report on Form 8-K furnished to the SEC on May 11, 2026. In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in these unaudited Condensed Consolidated Financial Statements.

As used in this section, the term the “Company” means Enviri Corporation, a Delaware corporation, and its direct and indirect subsidiaries prior to the completion of the Holding Company Merger.

Recently Adopted and Recently Issued Accounting Standards

The following accounting standards were adopted during the three months ended March 31, 2026:

The Company adopted a change issued by the FASB that provides an optional practical expedient for estimating future credit losses on current accounts receivable and current contract assets that arise from certain contracts with customers. The adoption of this change did not have a material impact on the Company's financial statements.

The Company adopted changes issued by the FASB, which required greater disaggregation of income tax disclosures, related to the income tax rate reconciliation and income taxes paid for each annual reporting period. The Company applied the new disclosure requirements prospectively to its annual report for the year ended December 31, 2025.The adoption of these changes did not have a material impact on the Company's consolidated financial statements.

The following accounting standards have been issued and become effective for the Company at a future date:

In December 2025, the FASB issued an update that provides authoritative guidance on the recognition, measurement and presentation of government grants received by business entities. This update defines government grants and establishes recognition criteria and disclosure requirements. This update becomes effective starting with the Company's annual financial statements for the year ended December 31, 2028 and includes the interim periods within each annual reporting period. Early adoption is permitted. The Company is currently evaluating the impact that this update will have on the Company's financial statements.

In November 2024, the FASB issued changes which require disaggregated disclosure of income statement expenses within the footnotes to the financial statement for each interim and annual reporting period. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2027 and will be in effect for the Company's interim financial statements after December 31, 2027. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. The Company is currently evaluating the impact that this change will have on the Company's disclosures.

New Enviri

Basis of Presentation [Line Items]

Basis of Presentation

New Enviri has prepared these unaudited Condensed Combined Financial Statements as of May 11, 2026 and in accordance with U.S. GAAP for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X of the SEC. Accordingly, the unaudited Condensed Combined Financial Statements do not include all information and disclosure required by U.S. GAAP for annual financial statements. The December 31, 2025 Condensed Combined Balance Sheets information contained in this Quarterly Report on Form 10-Q was derived from the 2025 audited Combined Financial Statements. These unaudited Condensed Combined Financial Statements should be read in conjunction with the audited combined financial statements, including the notes thereto, included in New Enviri's Information Statement (the "Information Statement"), dated May 8, 2026, attached as Exhibit 99.1 to New Enviri's Current Report on Form 8-K furnished to the SEC on May 11, 2026. In the opinion of management, all adjustments (all of which are of a normal recurring nature) that are necessary for a fair statement are reflected in these unaudited Condensed Combined Financial Statements. The operations comprising New Enviri are in two segments – HE and Rail, all of which are wholly owned by Enviri. Accordingly, Enviri’s net investment in these operations is shown in lieu of stockholders' equity in the Condensed Combined Financial Statements.

Recently Adopted and Recently Issued Accounting Standards

The following accounting standards were adopted during the three months ended March 31, 2026:

New Enviri adopted a change issued by the FASB that provides an optional practical expedient for estimating future credit losses on current accounts receivable and current contract assets that arise from certain contracts with customers. The adoption of this change did not have a material impact on New Enviri's financial statements.

New Enviri adopted changes issued by the FASB, which required greater disaggregation of income tax disclosures, related to the income tax rate reconciliation and income taxes paid for each annual reporting period. New Enviri applied the new disclosure requirements prospectively to its audited combined financial statements in the Information Statement for the year ended December 31, 2025.The adoption of these changes did not have a material impact on New Enviri’s combined financial statements.

The following accounting standards have been issued and become effective for New Enviri at a future date:

In December 2025, the FASB issued an update that provides authoritative guidance on the recognition, measurement and presentation of government grants received by business entities. This update defines government grants and establishes recognition criteria and disclosure requirements. This update becomes effective starting with New Enviri's annual financial statements for the year ended December 31, 2028 and includes the interim periods within each annual reporting period. Early adoption is permitted. New Enviri is currently evaluating the impact that this update will have on New Enviri's financial statements.

In November 2024, the FASB issued changes which require disaggregated disclosure of income statement expenses within the footnotes to the financial statement for each interim and annual reporting period. The changes become effective starting with New Enviri's annual financial statements for the year ended December 31, 2027 and will be in effect for New Enviri's interim financial statements after December 31, 2027. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. New Enviri is currently evaluating the impact that this change will have on its disclosures.