Legal, Environmental and Other Contingencies - Schdule of Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Sep. 30, 2015
Environmental post-closure monitoring and maintenance activities	$ 749	$ 749
Long-term obligations (less current portion)
Maturities of long-term obligations (discounted)
2017	73
2018	77
2019	58
2020	49
2021 and thereafter	405
Long-term obligations (less current portion)	$ 662