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Basis of Presentation - Fresh Start (Details) | Apr. 03, 2017
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Predecessor |
Fresh-Start Adjustment [Line Items] |
Voting shares received upon reorganization (less than 50%) | 50.00%

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- Definition Voting Shares Received Upon Reorganization, Percent + References No definition available. + Details
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Namespace Prefix: | btu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |