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Document and Entity Information
Dec. 07, 2022
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001691303
Current Fiscal Year End Date --12-22
Document Type 8-K
Document Period End Date Dec. 07, 2022
Entity Registrant Name WARRIOR MET COAL, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-38061
Entity Tax Identification Number 81-0706839
Entity Address, Address Line One 16243 Highway 216
Entity Address, City or Town Brookwood
Entity Address, State or Province AL
Entity Address, Postal Zip Code 35244
City Area Code (205)
Local Phone Number 554-6150
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common Stock, par value $.01 per share
Trading Symbol HCC
Security Exchange Name NYSE
Series A Preferred Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Rights to Purchase Series A Junior Participating Preferred Stock, par value $0.01 per share
Trading Symbol —
Security Exchange Name NYSE