Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Concentrations of Credit Risk) (Details)

v3.5.0.2
Summary of Significant Accounting Policies (Concentrations of Credit Risk) (Details) - Customer
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2015
Accounts Receivable | Customer Concentration Risk      
Concentration Risk [Line Items]      
Concentration risk, percentage 11.00%    
Number of customers 1 0  
US Treasuries and FDIC Insured | Cash, cash equivalents and restricted cash      
Concentration Risk [Line Items]      
Concentration risk, percentage 70.00%   62.00%