Summary of Significant Accounting Policies - Warranty (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Movement in Standard Product Warranty Accrual [Roll Forward]
Warranty beginning balance	$ 793	$ 628
Warranty – BTU merger	0	806
Additions for warranties issued during the period	691	411
Reductions in the liability for payments made under the warranty	624	822
Changes related to pre-existing warranties	(121)	92
Currency translation adjustment	6	(92)
Warranty ending balance	$ 745	$ 1,023
Minimum
Product Warranty [Line Items]
Standard product warranty, period	12 months
Maximum
Product Warranty [Line Items]
Standard product warranty, period	24 months