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Legal & Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2013
Sep. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Sep. 30, 2012
USD ($)
Mar. 31, 2012
USD ($)
Loss Contingencies            
Amount in excess of amounts reserved $ 18.0          
APR Percentage Allegedly Misleading         120.00%  
Number Of Putative Class Actions Filed   4        
Damages Claimed By Plaintiff     $ 50.0   $ 70.0 $ 40.0
Damages Claimed By Defendant     $ 1.5      
Federal Lawsuits            
Loss Contingencies            
Number of merchants requesting exclusion 460          
Class Action Settlement            
Loss Contingencies            
Number of merchants requesting exclusion 8,000          
Percentage of escrow funds returned to defendants 25.00%          
Escrow Deposit       $ 46.0