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Business and Basis of Presentation - Description of the Business (Details) - USD ($) $ in Billions	Nov. 05, 2015	Apr. 01, 2011
Predecessor
Business Acquisition [Line Items]
Credit bid to acquire business	$ 1.1
Walter Energy, Inc. | Senior Secured Notes | Senior Secured Notes due 2019
Business Acquisition [Line Items]
Stated interest rate		9.50%

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Business Acquisition, Credit Bid

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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