Nature of Business and Significant Accounting Policies Property and Equipment (Details)	12 Months Ended
	Sep. 30, 2013
Land improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	40 years
Plant and process equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Plant and process equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years
Office furniture and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Office furniture and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years