Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Product Sales [Member]
Concentration Risk [Line Items]
Percentage of revenue	95.50%	95.50%	96.70%
Non-Product Sales [Member]
Concentration Risk [Line Items]
Percentage of revenue	4.50%	4.50%	3.30%
Professional and Engineering Sales [Member]
Concentration Risk [Line Items]
Percentage of revenue	4.10%	4.20%	2.90%