Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Inventory obsolescence reserve [Member]
Summarized data for each of the quarters
Balance at Beginning of Period	$ 9,552	$ 6,645	$ 4,613
Charged to Costs And Expenses	1,793	4,608	2,872
Charged to Other Assets
(Deductions) And Additions	(2,021)	(1,701)	(840)
Balance at End of Period	9,324	9,552	6,645
Allowance for doubtful accounts on accounts and notes receivable [Member]
Summarized data for each of the quarters
Balance at Beginning of Period	411	334	848
Charged to Costs And Expenses	118	128	(479)
Charged to Other Assets
(Deductions) And Additions	(249)	(51)	(35)
Balance at End of Period	$ 280	$ 411	$ 334