XML 36 R73.htm IDEA: XBRL DOCUMENT v2.4.0.6
Investments - Fair Value and Gross Unrealized Losses of Available-for-Sale Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Securities
Sep. 30, 2011
Securities
Total number of available-for-sale securities in an unrealized loss position, Less than 12 months 100 505
Total number of available-for-sale securities in an unrealized loss position, 12 months or longer 56  
Total number of available-for-sale securities in an unrealized loss position 156 505
Available-for-sale securities, fair value, less than 12 months $ 681,091 $ 4,648,010
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (11,936) (234,795)
Available-for-sale securities, fair value,12 months or longer 323,838  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (18,556)  
Available-for-sale securities, fair value, Total 1,004,929 4,648,010
Available-for-sale Securities, gross unrealized Losses, Total (30,492) (234,795)
Asset-backed securities [Member]
   
Available-for-sale securities, fair value, less than 12 months 169,794 275,135
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (1,042) (2,770)
Available-for-sale securities, fair value,12 months or longer 7,533  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (567)  
Available-for-sale securities, fair value, Total 177,327 275,135
Available-for-sale Securities, gross unrealized Losses, Total (1,609) (2,770)
Commercial mortgage-backed securities [Member]
   
Available-for-sale securities, fair value, less than 12 months 813 338,865
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (853) (18,163)
Available-for-sale securities, fair value,12 months or longer 10,716  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (1,554)  
Available-for-sale securities, fair value, Total 11,529 338,865
Available-for-sale Securities, gross unrealized Losses, Total (2,407) (18,163)
Corporates [Member]
   
Available-for-sale securities, fair value, less than 12 months 411,310 3,081,556
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (8,124) (130,352)
Available-for-sale securities, fair value,12 months or longer 45,482  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (1,844)  
Available-for-sale securities, fair value, Total 456,792 3,081,556
Available-for-sale Securities, gross unrealized Losses, Total (9,968) (130,352)
Equities [Member]
   
Available-for-sale securities, fair value, less than 12 months   99,772
Available-for-sale Securities, gross unrealized Losses, less than 12 Months   (9,033)
Available-for-sale securities, fair value,12 months or longer 44,513  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (1,272)  
Available-for-sale securities, fair value, Total 44,513 99,772
Available-for-sale Securities, gross unrealized Losses, Total (1,272) (9,033)
Hybrids [Member]
   
Available-for-sale securities, fair value, less than 12 months 13,407 450,376
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (339) (51,055)
Available-for-sale securities, fair value,12 months or longer 107,707  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (9,211)  
Available-for-sale securities, fair value, Total 121,114 450,376
Available-for-sale Securities, gross unrealized Losses, Total (9,550) (51,055)
Municipals [Member]
   
Available-for-sale securities, fair value, less than 12 months 71,160 1,137
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (1,090) (7)
Available-for-sale securities, fair value, Total 71,160 1,137
Available-for-sale Securities, gross unrealized Losses, Total (1,090) (7)
Agency residential mortgage-backed securities [Member]
   
Available-for-sale securities, fair value, less than 12 months 1,754 25,820
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (199) (295)
Available-for-sale securities, fair value,12 months or longer 6,110  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (135)  
Available-for-sale securities, fair value, Total 7,864 25,820
Available-for-sale Securities, gross unrealized Losses, Total (334) (295)
Non-agency residential mortgage-backed securities [Member]
   
Available-for-sale securities, fair value, less than 12 months 12,853 375,349
Available-for-sale Securities, gross unrealized Losses, less than 12 Months (289) (23,120)
Available-for-sale securities, fair value,12 months or longer 101,777  
Available-for-sale Securities, gross unrealized Losses, 12 Months or Longer (3,973)  
Available-for-sale securities, fair value, Total 114,630 375,349
Available-for-sale Securities, gross unrealized Losses, Total $ (4,262) $ (23,120)