Operating Segments (Details 1)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Revenue from major customers
Major customer percentage of total revenue	19.00%
Medtronic [Member]
Revenue from major customers
Major customer percentage of total revenue	19.00%	18.00%	16.00%
Johnson & Johnson [Member]
Revenue from major customers
Major customer percentage of total revenue		16.00%	22.00%