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Basis of Presentation (Details) a in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) a classification segment | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) a classification segment | Mar. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |
Number of business segments | segment | 3 |  | 3 |
Ownership interest (as a percent) | 51.00% | 51.00% | 51.00% | 51.00%
Citree |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Net income (loss) attributable to noncontrolling interest | $ | $ (33) | $ 104 | $ (49) | $ 88
Land |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Area of land owned (in acres) | 121 |  | 121 |
Number of primary classifications | classification | 2 |  | 2 |
Mineral Rights |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Area of land owned (in acres) | 90 |  | 90 |

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- Definition Amount, before tax, of income (loss) attributable to noncontrolling interest. Includes, but is not limited to, income (loss) from continuing operations, discontinued operations and equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.19) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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