Segment and Geographic Information (Narrative) (Details) $ in Millions	12 Months Ended
	Sep. 30, 2016 USD ($) segment	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of primary operating segments | segment	2
United States
Segment Reporting Information [Line Items]
Export sales to third-party customers | $	$ 75.8	$ 54.2	$ 58.1
Customer concentration risk | Combined sales | Customer one
Segment Reporting Information [Line Items]
Concentration risk, percentage	21.00%	21.00%	19.00%
Customer concentration risk | Combined sales | Customer two
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.00%	13.00%	14.00%
Customer concentration risk | Combined sales | Customer three
Segment Reporting Information [Line Items]
Concentration risk, percentage	13.00%	11.00%	11.00%
Product concentration risk | Combined sales
Segment Reporting Information [Line Items]
Concentration risk, percentage	12.00%	11.00%