Dispositions (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		3 Months Ended
	Oct. 31, 2014	Mar. 31, 2014 Discontinued Operations [Member]	Dec. 31, 2013 Discontinued Operations [Member]	Mar. 31, 2013 Bailey Longwall Shields [Member]	Mar. 31, 2014 Bailey Longwall Shields [Member]	Sep. 30, 2013 Crowsnest Pass [Member]	Sep. 30, 2013 Potomac coal reserves [Member]	Sep. 30, 2013 Ryerson Park Lake and Dam [Member]	Apr. 30, 2013 Ryerson Park Lake and Dam [Member] acre
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest in property sold						$ 0.50
Sale Leaseback Transaction, Net Book Value					75,357,000
Benefit Obligations Assumed By Murray Energy			2,050,656,000
Sale Leaseback Transaction, Net Proceeds				71,166,000
Proceeds from Sale of Property, Plant, and Equipment	71,000,000		825,285,000			24,764,000	25,000,000
Gain (Loss) on Sale of Property Plant Equipment			1,035,346,000	(358,000)		15,260,000	24,663,000
Litigation Settlement, Amount								36,000,000
Restructuring Costs			24,715,000
Discontinued Operations amount of adjustment to prior period gain on disposal		7,044,000
Bonus Payment								$ 13,728,000
Gas and Oil Area, Undeveloped, Gross									506,000