Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Stock Options Using Valuation Assumptions (Details)

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Stockholders' Equity - Schedule of Stock Options Using Valuation Assumptions (Details) - Employee Stock Option
6 Months Ended 12 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2016
2019 Modified Option Grants      
Class of Stock [Line Items]      
Expected Volatility 25.00%    
Expected Term (in years) 1 year 6 months    
Risk Free Rate 2.52%    
2019 Option Grants      
Class of Stock [Line Items]      
Expected Volatility 30.00%    
Expected Term (in years) 4 years 1 month 2 days    
Risk Free Rate 2.95%    
2018 Option Grants      
Class of Stock [Line Items]      
Expected Volatility   30.00%  
Expected Term (in years)   3 years 3 months 26 days  
Risk Free Rate   2.80%  
2016 Option Grants      
Class of Stock [Line Items]      
Expected Volatility     32.19%
Risk Free Rate     2.45%
2016 Option Grants | Minimum      
Class of Stock [Line Items]      
Expected Term (in years)     2 years 7 months
2016 Option Grants | Maximum      
Class of Stock [Line Items]      
Expected Term (in years)     4 years