Commitments and Contingencies (Development Projects) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]
Purchases of property, plant and equipment	$ 1,256	$ 978	$ 610
Tempress Systems and Energy Research Centre Agreement
Schedule of Equity Method Investments [Line Items]
Purchases of property, plant and equipment				$ 1,400
Ownership rights, results of projects developed separately by individual parties				100.00%
Research and development, required contribution, labor and assets				$ 1,400