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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 12 Months Ended | 33 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2019 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2020
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Statutory tax rate | 21.00% | 35.00% |  |  | 21.00% | 21.00% | 24.50% | 35.00% | 21.00%
Net discrete impacts of the enactment of the Tax Act |  |  | $ 10,588 | $ 14,778 |  |  | $ 10,860 |  |
Undistributed foreign earnings not provided for taxes |  |  |  |  | $ 296,165 |  |  |  | $ 296,165
Net operating loss deferred tax asset, foreign |  |  |  |  | 6,106 | $ 6,836 |  |  | 6,106
Unrecognized tax benefits that, if recognized, would affect the effective tax rate |  |  |  |  | 4,730 | 4,411 |  |  | 4,730
Accrued interest and penalties |  |  |  |  | 489 | $ 437 |  |  | 489
Possible decrease in unrecognized tax benefits liability |  |  |  |  | $ 84 |  |  |  | $ 84
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Years remaining open to tax examination |  |  |  |  | 2018 |  |  |  |
Internal Revenue Service (IRS) [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Years remaining open to tax examination |  |  |  |  | 2017 |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Years remaining open to tax examination |  |  |  |  | 2016 |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |
Years remaining open to tax examination |  |  |  |  | 2016 |  |  |  |

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