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Investments (Details 9) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Proceeds from investments sold, matured or repaid:    
Total proceeds from investments sold, matured or repaid $ 4,386,328 $ 1,114,541
Cost of investments acquired:    
Cost of investments acquired (3,860,613) (1,254,487)
Available-for-sale [Member]
    
Proceeds from investments sold, matured or repaid:    
Total proceeds from investments sold, matured or repaid 4,208,621 648,243
Cost of investments acquired:    
Cost of investments acquired (3,696,967) (730,468)
Held-to-maturity [Member]
    
Proceeds from investments sold, matured or repaid:    
Total proceeds from investments sold, matured or repaid 75,649 70,792
Cost of investments acquired:    
Cost of investments acquired (34,758) (52,682)
Trading [Member]
    
Proceeds from investments sold, matured or repaid:    
Total proceeds from investments sold, matured or repaid 12,027 331,417
Cost of investments acquired:    
Cost of investments acquired (22,924) (433,810)
Derivatives and other [Member]
    
Proceeds from investments sold, matured or repaid:    
Total proceeds from investments sold, matured or repaid 90,031 64,089
Cost of investments acquired:    
Cost of investments acquired $ (105,964) $ (37,527)