Income Taxes (Summary Of Federal Income Tax Rate And Effective Income Tax Rate) (Details)	12 Months Ended
Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	(35.00%)	35.00%	35.00%
Change in valuation allowance	57.00%	63.00%	(11.00%)
State income taxes, net of federal tax benefit	0.00%	7.00%	1.00%
Federal and state research and development credits	(9.00%)	(8.00%)	(0.00%)
Resolution of Uncertain Tax Position	0.00%	(11.00%)	0.00%
Foreign rate differences	(41.00%)	(213.00%)	(19.00%)
Foreign withholding tax	3.00%	14.00%	3.00%
U.S. permanent items	4.00%	34.00%	4.00%
Other, net	2.00%	0.00%	1.00%
Effective income tax rate	(19.00%)	(79.00%)	14.00%

Effective Income Tax Rate Reconciliation, Foreign Income Tax Withholding, Percent

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Effective Income Tax Rate Reconciliation, Permanent Domestic Items, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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