Schedule II Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 1,556	$ 1,872	$ 1,266
Charged to costs and expenses	268	850	1,109
Charged to other accounts	108	149	129
Deductions	(636)	(1,315)	(632)
Balance at end of period	1,296	1,556	1,872
Inventory Obsolescence Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	447	484	398
Charged to costs and expenses	48	(1)	148
Charged to other accounts	(92)
Deductions	(3)	(36)	(62)
Balance at end of period	$ 400	$ 447	$ 484