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Litigation and Environmental Contingencies - Litigation (Details) - Huffman vs. Forestar Petroleum Corporation - Settled Litigation - USD ($) | 3 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016
Loss Contingencies [Line Items] |  |
Litigation settlement, amount |  | $ 150,000
Increase in accrual | $ 1,890,000 | $ 1,100,000
Accrual for damages | $ (2,990,000) |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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