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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Fair Value Disclosures [Abstract] |  |  |  |
Impairment charges on projects in progress | $ 0 |  | $ 0 |
Impairment of projects in process |  |  | $ 110,000,000 |
Impairment charge |  |  |  | $ 109,000,000
Impairment of land held for sale |  | $ 38,600,000.0 |  | $ 38,588,000

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- Definition Impairment of Inventory, Projects in Progress + References No definition available. + Details
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- Definition Inventory Impairment, Results of Discounted Cash Flow Analysis + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2611-110228 + Details
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