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Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Assets: |  |
Cash and cash equivalents | $ 77,905 | $ 114,314
Short-term investments | 23,622 | 19,667
Other assets | 9,452 | 9,100
Liabilities: |  |
Deferred compensation | 9,675 | 8,527
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Cash and cash equivalents | 77,905 | 114,314
Short-term investments | 23,622 | 19,667
Other assets | 0 | 0
Liabilities: |  |
Deferred compensation | 0 | 0
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Other assets | 9,452 | 9,100
Liabilities: |  |
Deferred compensation | 9,675 | 8,527
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Cash and cash equivalents | 0 | 0
Short-term investments | 0 | 0
Other assets | 0 | 0
Liabilities: |  |
Deferred compensation | $ 0 | $ 0

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