Business and Basis of Presentation	3 Months Ended
Business and Basis of Presentation	Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Business Alpha Metallurgical Resources, Inc. (“Alpha” or the “Company”) is a Tennessee-based mining company with operations across Virginia and West Virginia. With customers across the globe, high-quality reserves and significant port capacity, Alpha is a leading U.S. supplier of metallurgical products for the steel industry. Basis of Presentation Together, the condensed consolidated statements of operations, comprehensive income (loss), balance sheets, cash flows and stockholders’ equity for the Company are referred to as the “Condensed Consolidated Financial Statements.” The Condensed Consolidated Financial Statements are also referenced across periods as “Condensed Consolidated Statements of Operations,” “Condensed Consolidated Statements of Comprehensive Income (Loss),” “Condensed Consolidated Balance Sheets,” “Condensed Consolidated Statements of Cash Flows,” and “Condensed Consolidated Statements of Stockholders’ Equity.” The Company’s former Northern Appalachia (“NAPP”) operations results of operations and financial position are reported as discontinued operations in the Condensed Consolidated Financial Statements. Refer to Note 2 for further information on discontinued operations. The Condensed Consolidated Financial Statements include all wholly-owned subsidiaries’ results of operations for the three months ended March 31, 2022 and 2021. All significant intercompany transactions have been eliminated in consolidation. The accompanying interim Condensed Consolidated Financial Statements are unaudited and have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) and in accordance with the rules and regulations of the United States Securities and Exchange Commission (“SEC”) for Form 10-Q. Such rules and regulations allow the omission of certain information and footnote disclosures normally included in the financial statements prepared in accordance with U.S. GAAP as long as the financial statements are not misleading. In the opinion of management, these interim Condensed Consolidated Financial Statements reflect all normal and recurring adjustments necessary for a fair presentation of the results for the periods presented. Results of operations for the three months ended March 31, 2022 are not necessarily indicative of the results to be expected for the year ending December 31, 2022 or any other period. These interim Condensed Consolidated Financial Statements should be read in conjunction with the Company’s Consolidated Financial Statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021. Reclassifications Certain amounts in the prior year Condensed Consolidated Statements of Cash Flows have been reclassified to conform to the current year presentation. COVID-19 Pandemic In the first quarter of 2020, the COVID-19 virus was declared a pandemic by the World Health Organization. The COVID-19 pandemic has had negative impacts on the Company’s business, results of operations, financial condition and cash flows. The Company experienced an increase in employee absences due to COVID-19. Indirectly, through some of the Company’s third-party vendors, the Company and the Company’s customers have experienced some supply chain disruptions due to the COVID-19 pandemic. The full extent of the impact of the COVID-19 pandemic on the Company’s operational and financial performance will depend on certain developments, including the duration of the virus, its impact on the Company’s customers and suppliers, and the range of governmental and community reactions to the pandemic, which cannot be fully predicted. Health and safety are core values of the Company and are the foundation for how the Company manages every aspect of its business. The Company continues to monitor developments closely and adjust as necessary, including with respect to the Company’s implemented policies, procedures, and prevention measures to protect the safety and health of its employees. Recently Adopted Accounting Guidance Financial Instruments: In March 2022, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) 2022-02, Financial Instruments - Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”). This update eliminates the troubled debt restructuring model for creditors that have adopted Topic 326. All loan modifications will now be accounted for under general loan modification guidance and, on a prospective basis, entities will be subject to new disclosure requirements covering modifications of receivables to borrowers experiencing financial difficulty. In addition, entities will be required to prospectively disclose current-period gross write-off information by year of origination. The amendments are effective for fiscal years beginning after December 15, 2022, with early application permitted. The Company adopted ASU 2022-02 during the first quarter of 2022. The adoption of this ASU did not have a material impact on the Company’s Condensed Consolidated Financial Statements and related disclosures.