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 Description of the Business Warrior Met Coal, Inc. (the "Company") is a U.S. based environmentally and socially minded supplier to the global steel industry. The Company is dedicated entirely to mining non-thermal met coal used as a critical component of steel production by metal manufacturers in Europe, South America and Asia. The Company is a large-scale, low-cost producer and exporter of premium met coal, also known as hard-coking coal ("HCC"), operating highly efficient longwall operations in its underground mines based in Alabama. The HCC that the Company produces from the Blue Creek coal seam contains very low sulfur, has strong coking properties and is of a similar quality to coal referred to as the premium HCC produced in Australia. The Company also generates ancillary revenues from the sale of natural gas extracted as a byproduct from the underground coal mines and royalty revenues from leased properties. Basis of Presentation The accompanying financial statements are presented in accordance with accounting principles generally accepted in the United States (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In our opinion, the financial statements include all adjustments (consisting of normal recurring accruals) necessary in order to make the financial statements not misleading. For further information, refer to the financial statements and related notes included in the Company's Annual Report on Form 10-K for the year ended December 31, 2021 (the "2021 Annual Report"). Operating results for the three months ended March 31, 2022 are not necessarily indicative of the final results that may be expected for the year ended December 31, 2022. The balance sheet at December 31, 2021 has been derived from the audited financial statements for the year ended December 31, 2021 included in the 2021 Annual Report. Collective Bargaining Agreement The Company's Collective Bargaining Agreement contract with the UMWA expired on April 1, 2021. While the Company continues to engage in good faith negotiations with the UMWA, the Company has not reached a new contract and the UMWA is engaging in a strike. As a result of the strike, the Company initially idled Mine No. 4 and scaled back operations at Mine No. 7. During the current quarter, the Company restarted operations at Mine No. 4. Due to the reduced operations at Mine No. 4 and Mine No. 7, the Company incurred idle mine expenses of $3.0 million for the three months ended March 31, 2022. These expenses are reported separately in the Condensed Statements of Operations and represent expenses incurred, such as electricity, insurance and maintenance labor. The Company has also incurred approximately $6.7 million of business interruption expenses for the three months ended March 31, 2022, which represent non-recurring expenses that are directly attributable to the ongoing UMWA strike for incremental safety and security, labor negotiations and other expenses. These expenses are also presented separately in the Condensed Statements of Operations. Black Warrior Methane (“BWM”) and Black Warrior Transmission (“BWT”) On March 1, 2022, the Company acquired the remaining 50% interest in BWM and BWT for $0.3 million. The purchase consideration has been preliminarily allocated to the assets acquired and liabilities assumed based upon their estimated fair values at the date of acquisition. A full and detailed valuation of the assets and liabilities is being completed with the assistance of an independent third party and certain information and analysis remains pending at this time. Accordingly, the allocation is preliminary and may change as additional information becomes available and is assessed by the Company. The final allocation of the consideration transferred may include adjustments to the fair value estimates of identifiable assets and liabilities, after a full review has been completed. The acquisition is not deemed to be material to the condensed financial statements.