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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
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Income Tax Disclosure [Abstract] |  |  |  |  |  |  |
Net operating loss carryforwards | [1] | $ 100,033 |  | $ 71,533 |  |  |
Foreign tax credits | [1] | 18,041 |  | 15,962 |  |  |
Capitalized research and development expense | [1] | 22,504 |  | 31,690 |  |  |
Pension benefits | [1] | 14,348 |  | 11,009 |  |  |
Deferred revenue | [1] | 65,145 |  | 71,399 |  |  |
Stock-based compensation | [1] | 19,846 |  | 16,777 |  |  |
Other reserves not currently deductible | [1] | 25,993 |  | 21,940 |  |  |
Amortization of intangible assets | [1] | 54,069 |  | 62,227 |  |  |
Other tax credits | [1] | 41,381 |  | 37,270 |  |  |
Depreciation | [1] | 3,002 |  | 3,465 |  |  |
Capital loss carryforward | [1] | 8,019 |  | 8,040 |  |  |
Deferred Tax Asset, Deferred Interest | [1] | 7,622 |  | 3,557 |  |  |
Other | [1] | 14,778 |  | 6,559 |  |  |
Gross deferred tax assets | [1] | 394,781 |  | 361,428 |  |  |
Valuation allowance |  | (235,503) | [1] | (198,168) | [1] | $ (177,500) | $ (156,500)
Total deferred tax assets | [1] | 159,278 |  | 163,260 |  |  |
Acquired intangible assets not deductible | [1] | (78,663) |  | (124,401) |  |  |
Pension prepayments | [1] | (542) |  | (395) |  |  |
Deferred revenue | [1] | (2,039) |  | (3,110) |  |  |
Other | [1] | (2,092) |  | (3,598) |  |  |
Deferred Tax Liabilities, Gross | [1] | 83,336 |  | 131,504 |  |  |
Net deferred tax assets | [1] | $ 75,942 |  | $ 31,756 |  |  |
[1] | (1) See Note B. Recent Accounting Pronouncements-Deferred Taxes regarding a change in the balance sheet classification of our deferred taxes.

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