Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015
Income Tax Contingency [Line Items]
Income tax provision	$ 1,164	$ 5,185	$ 844	$ 10,573
Effective tax rate	19.00%	42.00%	8.00%	77.00%
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
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