Segment Information (Narrative) (Details) (General Electric [Member])	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
General Electric [Member]
Percentage of net sales from major customer	14.00%	15.00%	17.00%
Percentage of accounts receivable from major customer	11.00%	14.00%