Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Development Projects) (Details)

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Commitments and Contingencies (Development Projects) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Schedule of Equity Method Investments [Line Items]      
Purchases of property, plant and equipment $ 978 $ 610 $ 462
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 agreement term     4 years
Research and development, required contribution, labor and assets     $ 1,400
Required contribution $ 0