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Legal Matters - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended
Jan. 27, 2014
Class plaintiffs
Jun. 30, 2014
Class plaintiffs
Jun. 30, 2013
Class plaintiffs
Sep. 30, 2013
Class plaintiffs
Dec. 16, 2013
Interchage Litigation
Loss Contingencies [Line Items]          
Payments on litigation matters   $ 0 [1] $ 4,033,000,000 [1] $ 4,033,000,000  
Adjustment to payments for litigation 1,100,000,000        
Damages sought by plaintiff from all defendant parties         $ 54,000,000,000
[1] Payments made in fiscal 2013 are associated with the interchange multidistrict litigation. See Note 13—Legal Matters.