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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Land Held for Sale | $ 0 | $ (168) | $ (38,588) | $ (168)
Total impairment and abandonment charges | 0 | 168 | 148,618 | 618
Continuing Operations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment charges on projects in progress | 0 | 0 | 110,030 | 0
Discontinued Operations |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Land Held for Sale | 0 | $ 0 | $ 0 | (450)
Total impairment and abandonment charges | $ 200 |  |  | $ 600

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