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Investments - Net Investment Income (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Schedule of Investments [Line Items]    
Gross investment income $ 734,462 $ 376,927
External investment expense (11,729) (7,087)
Net investment income 722,733 369,840
Fixed maturity available-for-sale securities [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 707,132 364,771
Equity available-for-sale securities [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 13,966 10,190
Invested cash and short-term investments [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 4,921 129
Policy loans [Member]
   
Schedule of Investments [Line Items]    
Gross investment income 707 1,511
Other investments [Member]
   
Schedule of Investments [Line Items]    
Gross investment income $ 7,736 $ 326