Commitments and Contingencies (Narrative) (Details)			1 Months Ended		3 Months Ended			6 Months Ended
	Oct. 01, 2014	Sep. 23, 2014 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2016 USD ($) building	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Mar. 31, 2016 USD ($) building	Mar. 31, 2015 USD ($)	Nov. 30, 2014 building
Loss Contingencies [Line Items]
Operating leases, rent expense					$ 300,000	$ 300,000		$ 600,000	$ 700,000
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					4.20%			4.20%
Accretion expense					$ 15,000	52,000		$ 30,000	67,000
Gain from change in estimate on ARO obligation							$ 2,900,000
Decrease in property, plant, and equipment							2,100,000
Asset retirement obligation, revision in estimated cash flows					0	$ 0	$ 800,000	0	845,000
Payments to terminate lease agreement			$ 200,000					200,000
Reduction in ARO								300,000
Business combination, indemnification assets, range of outcomes, value				$ 3,400,000.0
Business combination, indemnification duration, period taken into account for				2 years
Gain on settlement								0	$ 280,000
Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 47,500,000
Receivable in escrow					1,900,000			1,900,000
Recovery of fees and costs from SEI								2,600,000
Gain on settlement					3,400,000			3,400,000
Write off of loss accrual					$ 400,000			400,000
Mirasol Class Action [Member]
Loss Contingencies [Line Items]
Accrual for contingency								$ 100,000
Buildings [Member] | Property Subject to Operating Lease [Member]
Loss Contingencies [Line Items]
Number of leased buildings | building					6			6
Leases retroactively effective | building										4
Lease term	3 years
Operating lease, term extension, option to extend	3 years
Discontinued Operations [Member] | Sumitomo Electric Industries, LTD [Member]
Loss Contingencies [Line Items]
Gain on settlement					$ 3,800,000			$ 3,800,000
Minimum [Member] | Mirasol Class Action [Member]
Loss Contingencies [Line Items]
Estimate of loss					100,000			100,000
Maximum [Member] | Mirasol Class Action [Member]
Loss Contingencies [Line Items]
Estimate of loss					$ 4,300,000			$ 4,300,000