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Investments (Details 7) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Net Investment Gains (Losses)        
Net realized gains on fixed maturity available-for-sale securities $ 37,895 $ 15,137 $ 172,188 $ 15,137
Realized gains (losses) on equity securities 417 (105) 783 (105)
Net realized gains on securities 38,312 15,032 172,971 15,032
Realized losses on certain derivative instruments (26,295) (3,258) (32,001) (3,258)
Unrealized gains (losses) on certain derivative instruments (24,839) (10,546) 114,649 (10,546)
Change in fair value of derivatives (51,134) (13,804) 82,648 (13,804)
Realized losses on other invested assets (84)   (1,003)  
Net investment gains (losses) $ (12,906) $ 1,228 $ 254,616 $ 1,228