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Cover Page
Feb. 19, 2020
Document Information [Line Items]  
Entity File Number 001-38061
Document Period End Date Feb. 19, 2020
Entity Registrant Name WARRIOR MET COAL, INC.
Entity Incorporation, State or Country Code DE
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 35444
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
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0001691303
Amendment Flag false
Document Type 8-K
Common Stock, par value $.01 per share  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, par value $.01 per share
Trading Symbol HCC
Rights to Purchase Series A Junior Participating Preferred Stock, par value $0.01 per share  
Document Information [Line Items]  
Title of 12(b) Security Rights to Purchase Series A Junior Participating Preferred Stock, par value $0.01 per share
No Trading Symbol Flag true