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Fair Value Measurements - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impairment of projects in process | $ 0 | $ 0 |
Impairment charges on land held for sale | 0 | $ 0 |
Level 2 | Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Deferred compensation plan assets | $ 3,000,000 |  | $ 2,700,000

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