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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Revenue from Contract with Customer [Line Items]        
Cumulative effect of adopting ASU $ 1,284,859 $ 1,336,326 $ 1,391,622 $ 1,368,313
Revenue from contracts with customers 14,800 16,600 15,636  
Interchange network charges 3,200 3,400    
Retained Earnings [Member]        
Revenue from Contract with Customer [Line Items]        
Cumulative effect of adopting ASU $ 143,162 $ 174,277 214,569 $ 234,640
Accounting Standards Update 2014-09 [Member] | Cumulative effect of adopting ASU [Member]        
Revenue from Contract with Customer [Line Items]        
Cumulative effect of adopting ASU     394  
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] | Cumulative effect of adopting ASU [Member]        
Revenue from Contract with Customer [Line Items]        
Cumulative effect of adopting ASU     $ 394