Expansion of LaPorte, Indiana Operations (Details) - Expansion of LaPorte, Indiana Operations - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Costs associated with project
Costs expensed in current period	$ 88	$ 340
Minimum
Costs associated with project
Estimated costs	2,300
Minimum | Equipment relocation
Costs associated with project
Estimated costs	1,800
Minimum | Other costs
Costs associated with project
Estimated costs	500
Maximum
Costs associated with project
Estimated costs	3,600
Maximum | Equipment relocation
Costs associated with project
Estimated costs	2,500
Maximum | Other costs
Costs associated with project
Estimated costs	$ 1,100