Commitments and Contingencies (Other Disclosures) (Details) $ in Thousands			1 Months Ended	3 Months Ended			9 Months Ended
	Oct. 01, 2014	Sep. 23, 2014 USD ($)	Mar. 31, 2012 USD ($)	Jun. 30, 2015 USD ($) building	Dec. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) building	Jun. 30, 2014 USD ($)
Loss Contingencies [Line Items]
Operating leases, rent expense, net				$ 300		$ 500	$ 1,000	$ 1,300
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				$ 22		43	$ 89	128
Gain from change in estimate on ARO obligation					$ 2,900		2,879
Asset retirement obligation, revision in estimated cash flows				$ 0	800	$ 0	$ 845	$ 0
Business combination, indemnification assets, range of outcomes, value (up to $3.4 million)			$ 3,400
Business combination, indemnification duration, period taken into account for			2 years
Leasehold Improvements
Loss Contingencies [Line Items]
Decrease in property, plant, and equipment					$ 2,100
Sumitomo Electric Industries, LTD
Loss Contingencies [Line Items]
Loss contingency, damages sought		$ 40,000
Buildings | Property Subject to Operating Lease
Loss Contingencies [Line Items]
Number of leased buildings | building				6			6
Lease term	3 years
Operating lease, term extension, option to extend	3 years