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Commitments, Contingencies and Guarantees - Additional Information (Detail) - USD ($)
Sep. 30, 2015
Sep. 29, 2014
Commitments and Contingencies Disclosure [Abstract]    
FDIC civil monetary penalties   $ 3,300,000
Maximum    
Loss Contingencies [Line Items]    
Contingency refund   $ 30,000,000
Private Education Loans    
Loss Contingencies [Line Items]    
Outstanding loan commitments $ 1,700,000,000