Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,516
Balance at Beginning of Period	6,675
Charged to Costs and Expenses	763	$ 2,147	$ 833
Inventory obsolescence expense	622
Balance at End of Period	2,449	2,516
Balance at End of Period	9,674	6,675
Inventory Obsolescence Reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	6,675	7,764	6,932
Inventory obsolescence expense	10,590	3,887	2,617
(Deductions) and Additions	(7,591)	(4,976)	(1,785)
Balance at End of Period	9,674	6,675	7,764
Allowance for Doubtful Accounts on Accounts and Notes Receivable
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	2,516	1,125	376
Charged to Costs and Expenses	763	2,147	833
(Deductions) and Additions	(330)	(756)	(84)
Balance at End of Period	$ 2,949	$ 2,516	$ 1,125