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Fair Value Measurements - Fair Value Assets Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unconsolidated entity investments |  |  | $ 80
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unconsolidated entity investments |  |  | 0
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unconsolidated entity investments |  |  | 0
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Unconsolidated entity investments |  |  | 80
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | $ 2,339 | $ 1,970 | 1,578
Fair Value, Measurements, Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | 0 | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | 2,339 | 1,970 | 1,578
Fair Value, Measurements, Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Development projects in progress |  | 84,982 | 1,312
Land held for sale | 6,240 | 5,207 | 1,724
Fair Value, Measurements, Nonrecurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Development projects in progress |  | 0 | 0
Land held for sale | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Development projects in progress |  | 0 | 0
Land held for sale | 0 | 0 | 0
Fair Value, Measurements, Nonrecurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Development projects in progress |  | 84,982 | 1,312
Land held for sale | $ 6,240 | $ 5,207 | $ 1,724

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- Definition Deferred Compensation Plan Assets, Fair Value Disclosure + References No definition available. + Details
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- Definition Inventory Land Held For Sale, Fair Value Disclosure + References No definition available. + Details
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- Definition Inventory Real Estate Land And Land Development Costs, Fair Value Disclosure + References No definition available. + Details
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- Definition Fair value portion of investments accounted under the equity method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117311354&loc=d3e32014-111567 + Details
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