Organization, Nature of Business and Basis of Presentation - Additional Information (Details)			1 Months Ended	3 Months Ended
	Mar. 28, 2017	Jun. 23, 2014	Jan. 31, 2019 MiningUnit	Mar. 31, 2019 segment MiningComplex	Apr. 16, 2015
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Number of Reportable Segments | segment				1
Number of underground mining complexes | MiningComplex				4
Number of continous miner unit resumed production | MiningUnit			1
Predecessor | Foresight Energy LLC | Member of Management
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Ownership percentage prior		0.667%
Predecessor | Foresight Reserves | Foresight Energy LLC
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Ownership percentage prior		99.333%
Predecessor | Murray Energy | Foresight Energy GP LLC
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Percentage of voting interests acquired	46.00%				34.00%
Predecessor | Murray Energy | Foresight Energy L.P
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Percentage of voting interests acquired					50.00%
Predecessor | Murray Energy | Foresight Energy GP LLC
Schedule Of Organization Nature Of Business And Basis Of Presentation [Line Items]
Ownership percentage prior	80.00%