Summary of Significant Accounting Policies (Concentrations of Credit Risk) (Details)	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011 Customer
United States [Member]
Concentration Risk [Line Items]
Percentage Of Cash And Cash Equivalents	50.00%
Accounts Receivable [Member]
Concentration Risk [Line Items]
Number Of Customers		2
Accounts Receivable [Member] | Customer One [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		14.00%
Accounts Receivable [Member] | Customer Two [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		12.00%
Accounts Receivable [Member] | Yingli Green Energy [Member]
Concentration Risk [Line Items]
Number Of Customers		1
Concentration risk, percentage	14.00%	33.00%