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Income Taxes (Summary Of Federal Income Tax Rate And Effective Income Tax Rate) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Disclosure [Abstract] |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 7,021 | $ (492) | $ (23,517)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | (181,047) | 17,334 | 37,996
Effective Income Tax Rate Reconciliation, Transition Impact of U.S. Tax Act 2017, Amount | 126,122 | 0 | 0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 69,648 | 0 | 0
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 2,401 | 627 | (82)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | (3,058) | (2,182) | (5,981)
Effective Income Tax Rate Reconciliation, Resolution of Uncertain Tax Positions, Amount | (4,646) | (3,840) | 0
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | (38,743) | (27,932) | (27,513)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Amount | 2,736 | 2,737 | 1,987
Effective Income Tax Rate Reconciliation, Excess Tax Benefits from Restricted Stock, Amount | (11,641) | 0 | 0
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount | 2,352 | 0 | 0
Effective Income Tax Rate Reconciliation, Permanent Domestic Items, Amount | 5,408 | 6,030 | 2,886
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | 116 | 73 | 1,497
Benefit from income taxes | $ (23,331) | $ (7,645) | $ (12,727)
Statutory federal income tax rate | 25.00% | 35.00% | 35.00%
Change in valuation allowance | (632.00%) | (1233.00%) | (57.00%)
Transition impact of U.S. Tax Act | 440.00% | 0.00% | 0.00%
Federal rate change | 243.00% | 0.00% | 0.00%
State income taxes, net of federal tax benefit | 8.00% | (45.00%) | 0.00%
Federal and state research and development credits | (11.00%) | 155.00% | 9.00%
Resolution of uncertain tax positions | (16.00%) | 273.00% | 0.00%
Foreign rate differences | (135.00%) | 1987.00% | 41.00%
Foreign withholding tax | 10.00% | (195.00%) | (3.00%)
Excess tax benefits from restricted stock | (41.00%) | 0.00% | 0.00%
Audits and settlements | 8.00% | 0.00% | 0.00%
U.S. permanent items | 19.00% | (429.00%) | (4.00%)
Other, net | 1.00% | (4.00%) | (2.00%)
Effective income tax rate | (81.00%) | 544.00% | 19.00%

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