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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
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Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 31,329 | $ 143,793 |  |
Foreign tax credits | 2,201 | 21,099 |  |
Capitalized research and development expense | 20,999 | 13,044 |  |
Pension benefits | 12,296 | 12,107 |  |
Prepaid expenses | 30,614 | 9,250 |  |
Deferred revenue | 33,886 | 59,022 |  |
Stock-based compensation | 11,622 | 25,360 |  |
Other reserves not currently deductible | 13,588 | 16,905 |  |
Amortization of intangible assets | 96,841 | 78,351 |  |
Other tax credits | 55,760 | 42,652 |  |
Depreciation | 4,364 | 3,095 |  |
Capital loss carryforward | 33,024 | 33,535 |  |
Deferred interest | 13,057 | 11,666 |  |
Other | 1,152 | 6,599 |  |
Gross deferred tax assets | 360,733 | 476,478 |  |
Valuation allowance | (141,950) | (279,683) | $ (235,500) | $ (198,200)
Total deferred tax assets | 218,783 | 196,795 |  |
Acquired intangible assets not deductible | (41,139) | (70,570) |  |
Pension prepayments | (2,362) | (2,093) |  |
Deferred revenue | (6,978) | (6,214) |  |
U.S taxes on unremitted foreign earnings | 0 | (11,440) |  |
U.S taxes on unremitted foreign earnings | (6,641) | 0 |  |
Other | (1,686) | (1,192) |  |
Total deferred tax liabilities | 58,806 | 91,509 |  |
Net deferred tax assets | $ 159,977 | $ 105,286 |  |

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