Commitments and Contingencies (Narrative) (Details) - USD ($)			1 Months Ended	3 Months Ended				12 Months Ended
	Oct. 01, 2014	Sep. 23, 2014	Mar. 31, 2012	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Loss Contingencies [Line Items]
Lease payments due in 2016				$ 1,000,000				$ 1,000,000
Lease payments due in 2017				$ 400,000				400,000
Operating leases, rent expense, net								$ 1,300,000	$ 1,700,000	$ 2,300,000
Fair value assumptions, credit adjusted risk-free rate, range minimal amount				3.25%				3.25%
Fair value assumptions, credit adjusted risk-free rate, range maximum amount				5.78%				5.78%
Accretion expense								$ 110,000	200,000	200,000
Gain from change in estimate on ARO obligation								2,879,000
Decrease in property, plant, and equipment								2,100,000
Asset retirement obligation, revision in estimated cash flows				$ 0	$ 0	$ 0	$ 845,000	$ 845,000	$ 0	$ 0
Business combination, indemnification assets, range of outcomes, value			$ 3,400,000.0
Business combination, indemnification duration, period taken into account for			2 years
Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 47,500,000
Buildings [Member] | Property Subject to Operating Lease [Member]
Loss Contingencies [Line Items]
Number of leased buildings				6				6
Lease term	3 years
Operating lease, term extension, option to extend	3 years