Summary of Significant Accounting Policies (Revenue Recognition) (Details)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Hardware products
Concentration Risk [Line Items]
Percentage of revenue	91.80%	89.70%	88.60%
Service
Concentration Risk [Line Items]
Percentage of revenue	8.20%	10.30%	11.40%