Legal, Environmental and Other Contingencies (Details) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Pending litigation item	Sep. 30, 2014 Claims involving personal injuries Pending litigation action
Legal, Environmental and Other Contingencies
Number of actions in which the entity is involved relating to welding rod-related injuries				2
Number of areas of concern that required investigation			1
Number of solid waste management units evaluated under RCRA, as required by IDEM			1
Accrual for post-closure monitoring and maintenance activities	$ 78	$ 79	$ 823