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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | ---
Assets: |  |
Cash equivalents | $ 435 | $ 434
Deferred compensation | 5,773 | 4,783
Liabilities: |  |
Deferred compensation | 4,449 | 4,487
Fair Value, Inputs, Level 1 |  |
Assets: |  |
Cash equivalents | 435 | 434
Deferred compensation | 1,643 | 1,879
Fair Value, Inputs, Level 2 |  |
Assets: |  |
Deferred compensation | 4,130 | 2,904
Liabilities: |  |
Deferred compensation | $ 4,449 | $ 4,487

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