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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
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Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 26,462 | $ 31,329 |  |
Foreign tax credits | 0 | 2,201 |  |
Capitalized research and development | 34,560 | 20,999 |  |
Pension benefits | 14,838 | 12,296 |  |
Prepaid expenses | 41,739 | 30,614 |  |
Deferred revenue | 9,899 | 33,886 |  |
Stock-based compensation | 12,306 | 11,622 |  |
Other reserves not currently deductible | 20,986 | 13,588 |  |
Amortization of intangible assets | 168,376 | 96,841 |  |
Research and development and other tax credits | 49,995 | 55,760 |  |
Fixed assets | 45,450 | 4,364 |  |
Capital loss carryforward | 31,248 | 33,024 |  |
Deferred interest | 10,864 | 13,057 |  |
Other | 1,623 | 1,152 |  |
Gross deferred tax assets | 468,346 | 360,733 |  |
Valuation allowance | (177,663) | (141,950) | $ (279,700) | $ (235,500)
Total deferred tax assets | 290,683 | 218,783 |  |
Acquired intangible assets not deductible | (42,554) | (41,139) |  |
Pension prepayments | (2,532) | (2,362) |  |
Deferred revenue | (19,312) | (6,978) |  |
Unbilled accounts receivable | (31,005) | 0 |  |
Deferred income | (19,040) | (6,641) |  |
Prepaid commissions | (17,423) | 0 |  |
Other | (1,866) | (1,686) |  |
Total deferred tax liabilities | (133,732) | (58,806) |  |
Net deferred tax assets | $ 156,951 | $ 159,977 |  |

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