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Investments (Details 3) (USD $)
In Thousands, unless otherwise specified
Jul. 01, 2012
Securities
Sep. 30, 2011
Securities
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months $ 2,063,750 $ 4,648,010
Available-for-sale securities, fair value,12 months or longer 747,305  
Available-for-sale securities, fair value, Total 2,811,055 4,648,010
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (38,843) (234,795)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (53,992)  
Available-for-sale Securities, gross unrealized Losses, Total (92,835) (234,795)
Total number of available-for-sale securities in an unrealized loss position 359 505
Asset-backed Securities [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 372,352 275,135
Available-for-sale securities, fair value,12 months or longer 8,346  
Available-for-sale securities, fair value, Total 380,698 275,135
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (3,931) (2,770)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (698)  
Available-for-sale Securities, gross unrealized Losses, Total (4,629) (2,770)
Commercial-mortgage-backed securities [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 17,426 338,865
Available-for-sale securities, fair value,12 months or longer 39,478  
Available-for-sale securities, fair value, Total 56,904 338,865
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (3,120) (18,163)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (3,348)  
Available-for-sale Securities, gross unrealized Losses, Total (6,468) (18,163)
Corporates [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 1,237,999 3,081,556
Available-for-sale securities, fair value,12 months or longer 304,068  
Available-for-sale securities, fair value, Total 1,542,067 3,081,556
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (20,327) (130,352)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (19,958)  
Available-for-sale Securities, gross unrealized Losses, Total (40,285) (130,352)
Equities [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 43,755 99,772
Available-for-sale securities, fair value,12 months or longer 15,752  
Available-for-sale securities, fair value, Total 59,507 99,772
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (2,029) (9,033)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (509)  
Available-for-sale Securities, gross unrealized Losses, Total (2,538) (9,033)
Hybrids [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 111,544 450,376
Available-for-sale securities, fair value,12 months or longer 170,406  
Available-for-sale securities, fair value, Total 281,950 450,376
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (3,213) (51,055)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (19,121)  
Available-for-sale Securities, gross unrealized Losses, Total (22,334) (51,055)
Municipals [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 109,336 1,137
Available-for-sale securities, fair value,12 months or longer 12,410  
Available-for-sale securities, fair value, Total 121,746 1,137
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (930) (7)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (114)  
Available-for-sale Securities, gross unrealized Losses, Total (1,044) (7)
Agency residential mortgage-backed securities [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 9,499 25,820
Available-for-sale securities, fair value,12 months or longer 6,207  
Available-for-sale securities, fair value, Total 15,706 25,820
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (211) (295)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (280)  
Available-for-sale Securities, gross unrealized Losses, Total (491) (295)
Non-agency residential mortgage-backed securities [Member]
   
Fair value and gross unrealized losses of available-for-sale securities    
Available-for-sale securities, fair value, less than 12 months 161,839 375,349
Available-for-sale securities, fair value,12 months or longer 190,638  
Available-for-sale securities, fair value, Total 352,477 375,349
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (5,082) (23,120)
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (9,964)  
Available-for-sale Securities, gross unrealized Losses, Total $ (15,046) $ (23,120)