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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Tax Contingency [Line Items]
Income tax provision (benefit)	$ 727	$ 6,379	$ (320)	$ 5,388
Effective tax rate	12.00%	237.00%	(7.00%)	368.00%
Retroactive tax benefit			$ 800	$ 600
Deferred Tax Assets, Valuation Allowance		$ 9,000		9,000
Release of a FIN 48 reserve related to the federal research and development tax credit		$ 4,100		$ 4,100
R&D Tax Credit
Income Tax Contingency [Line Items]
Tax credit carryforward description			On December 18, 2015, the “Protecting Americans from Tax Hikes Act of 2015” was enacted which retroactively reinstated and made permanent the R&D Tax Credit

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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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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