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Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
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Composition Of Certain Financial Statement Captions [Abstract] |  |
Trade accounts receivable | $ 178,079 | $ 162,531
Accounts receivable from patent administration program licensees | 115,227 | 92,896
Contract assets | 275,390 | 176,218
Accounts receivable and contract assets, gross | 568,696 | 431,645
Less: allowance for credit losses on accounts receivable and contract assets | (10,119) | (11,959)
Total accounts receivable and contract assets, net | $ 558,577 | $ 419,686

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