Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Change in Control Agreements (Details)

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Commitments and Contingencies - Change in Control Agreements (Details) - CIC Agreements - employee
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Loss Contingencies [Line Items]    
Period of the change in control 18 months  
CIC Recipients    
Loss Contingencies [Line Items]    
Number of key employees   22