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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
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Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carryforwards | $ 143,793 | $ 100,033 |  |
Foreign tax credits | 21,099 | 18,041 |  |
Capitalized research and development expense | 13,044 | 22,504 |  |
Pension benefits | 12,107 | 14,348 |  |
Deferred revenue | 59,022 | 65,145 |  |
Stock-based compensation | 25,360 | 19,846 |  |
Other reserves not currently deductible | 16,905 | 25,993 |  |
Amortization of intangible assets | 78,351 | 54,069 |  |
Other tax credits | 42,652 | 41,381 |  |
Depreciation | 3,095 | 3,002 |  |
Capital loss carryforward | 33,535 | 8,019 |  |
Deferred interest | 11,666 | 7,622 |  |
Other | 15,849 | 14,778 |  |
Gross deferred tax assets | 476,478 | 394,781 |  |
Valuation allowance | (279,683) | (235,503) | $ (198,200) | $ (177,500)
Total deferred tax assets | 196,795 | 159,278 |  |
Acquired intangible assets not deductible | (70,570) | (78,663) |  |
Pension prepayments | (2,093) | (542) |  |
Deferred revenue | (6,214) | (2,039) |  |
U.S taxes on unremitted foreign earnings | (11,440) | (67) |  |
Other | (1,192) | (2,025) |  |
Total deferred tax liabilities | 91,509 | 83,336 |  |
Net deferred tax assets | $ 105,286 | $ 75,942 |  |

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