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Investments (Details 8) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Additional detail regarding investment gains (losses) on securities        
Total other-than-temporary impairments $ (2,406) $ (1,403) $ (21,317) $ (1,403)
Less non-credit portion of other-than-temporary impairments included in other comprehensive income 81 (144) (1,530) (144)
Net other-than-temporary impairments (2,487) (1,259) (19,787) (1,259)
Gains on derivative instruments (51,134) (13,804) 82,648 (13,804)
Other realized investment gains 40,715 16,291 191,755 16,291
Net investment gains (losses) $ (12,906) $ 1,228 $ 254,616 $ 1,228