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New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Rent expense for all operating leases | $ 7,578 | $ 8,348 | $ 8,302 |
Future minimum rental payments required under operating leases | 26,919 |  |  |
ASU 2016-16 [Member] |  |  |  |
Cumulative effect from adoption | (1,005) |  |  |
Retained Earnings [Member] | ASU 2016-16 [Member] |  |  |  |
Cumulative effect from adoption | $ (1,005) |  |  |
Retained Earnings And Other Current Assets [Member] | ASU 2016-16 [Member] |  |  |  |
Cumulative effect from adoption |  |  |  | $ 1,005

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