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Summary of Significant Accounting Policies - Stock Based Compensation (Details)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Restricted Stock Units (RSUs) [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining vesting period 1 year    
Vesting period 3 years 3 years 3 years
Restricted Stock Units (RSUs) [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining vesting period 5 years    
Vesting period 5 years 5 years  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Employee Stock Option [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Employee Stock Option [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 9 years 9 months