Income Taxes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Income Taxes [Line Items]
Effective tax rate	28.60%	31.40%	33.00%
U.S. Federal statutory rate	35.00%	35.00%	35.00%
Deferred taxes on undistributed earnings	$ 28
Undistributed earnings of foreign subsidiaries	14,262	13,047	23,526
Unrecognized tax benefits that would impact effective tax rate	547	666	675
Unrecognized tax benefits, related interest and penalties	82	58
Unrecognized tax benefits and related interest and penalties expected to reverse within the next 12 months, upper limit	$ 275
Minimum [Member]
Income Taxes [Line Items]
Statute of limitations on state income tax returns	3 years
Statute of limitations on the examination of tax returns	2 years
Maximum [Member]
Income Taxes [Line Items]
Statute of limitations on state income tax returns	4 years
Statute of limitations on the examination of tax returns	6 years