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Loss Contingencies - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 27, 2020
Jun. 21, 2019
Sep. 30, 2018
Mar. 31, 2020
Sep. 30, 2019
Dec. 31, 2016
Bureau of the Fiscal Service            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value   $ 5.4        
United States Department of Education Matter            
Loss Contingencies [Line Items]            
Loss contingency, damages sought, value     $ 6.5      
Litigation settlement, amount awarded to other party $ 3.0          
Legal reserve       $ 1.0 $ 1.0  
Higher One | United States Department of Education Matter            
Loss Contingencies [Line Items]            
Escrow deposit           $ 1.0