Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense related to intangible assets	$ 8,850	$ 6,744	$ 6,179
Estimated intangible asset amortization for 2016	9,000
Estimated intangible asset amortization for 2017	9,000
Estimated intangible asset amortization for 2018	9,000
Estimated intangible asset amortization for 2019	9,000
Estimated intangible asset amortization for 2020	$ 9,000
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Expected remaining useful life	20 years
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Expected remaining useful life	17 years
Capitalized Software [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Expected remaining useful life	7 years
Capitalized Software [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Expected remaining useful life	3 years