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Composition Of Certain Financial Statement Captions (Schedule Of Other Non-Current Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Composition Of Certain Financial Statement Captions [Abstract] |  |
Supplemental retirement plan obligations | $ 3,902 | $ 4,127
Non-current tax liabilities | 93,465 | 83,758
Other liabilities | 10,799 | 12,237
Total other non-current liabilities | $ 108,166 | $ 100,122

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