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Fair Value of Financial Instruments - Assets and Liabilities Carrying at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Assets        
Cash and cash equivalents $ 1,470,711 $ 1,137,359 $ 256,831 $ 97,800
Short-term investments (including related interest receivable of $5)        
Derivative investments 200,667 52,335    
Other invested assets 198,868 44,279    
Asset-backed loans and other invested assets 180,054      
Derivatives, liabilities:        
Derivative investments          
Consumer Products and Other [Member]
       
Assets        
Cash and cash equivalents 408,889 321,352 256,831  
Derivatives, liabilities:        
Equity conversion feature of preferred stock 231,950 75,350    
Level 2 [Member] | Consumer Products and Other [Member]
       
Assets        
Cash and cash equivalents 19,994 29,009    
Recurring [Member] | Fair Value [Member]
       
Short-term investments (including related interest receivable of $5)        
Total financial assets 18,433,325 17,242,602    
Derivatives, liabilities:        
Total financial liabilities 16,763,241 16,064,384    
Recurring [Member] | Carrying Amount [Member]
       
Short-term investments (including related interest receivable of $5)        
Total financial assets 18,433,316 17,242,600    
Derivatives, liabilities:        
Total financial liabilities 18,019,582 17,094,630    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member]
       
Assets        
Cash and cash equivalents 408,889 321,352    
Contingent purchase price reduction receivable 41,000      
Liabilities        
Total debt 2,328,831 2,135,528    
Derivatives, liabilities:        
Equity conversion feature of preferred stock 231,950 75,350    
Redeemable preferred stock, excluding equity conversion feature 368,880 337,060    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member] | Foreign exchange forward agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 1,235 3,189    
Derivatives, liabilities:        
Derivative investments 9,956 25,679    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member] | Commodity swap and option agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 2,002 274    
Derivatives, liabilities:        
Derivative investments 9 1,232    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member] | Interest rate swap agreements [Member]
       
Derivatives, liabilities:        
Derivative investments   1,954    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member] | Equity [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - trading 146,842 262,085    
Recurring [Member] | Consumer Products and Other [Member] | Fair Value [Member] | Fixed maturities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities - held to maturity 35,000 75,899    
Equity securities - trading   12,665    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member]
       
Assets        
Cash and cash equivalents 408,889 321,352    
Contingent purchase price reduction receivable 41,000      
Liabilities        
Total debt 2,167,039 2,048,780    
Derivatives, liabilities:        
Equity conversion feature of preferred stock 231,950 75,350    
Redeemable preferred stock, excluding equity conversion feature 319,225 292,437    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member] | Foreign exchange forward agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 1,235 3,189    
Derivatives, liabilities:        
Derivative investments 9,956 25,679    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member] | Commodity swap and option agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 2,002 274    
Derivatives, liabilities:        
Derivative investments 9 1,232    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member] | Interest rate swap agreements [Member]
       
Derivatives, liabilities:        
Derivative investments   1,954    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member] | Equity [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - trading 146,842 262,085    
Recurring [Member] | Consumer Products and Other [Member] | Carrying Amount [Member] | Fixed maturities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities - held to maturity 34,991 75,897    
Equity securities - trading   12,665    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member]
       
Assets        
Cash and cash equivalents 1,061,822 816,007    
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale   287,043    
Derivative investments 200,667 52,335    
Other invested assets   44,279    
Asset-backed loans and other invested assets 198,868      
Derivatives, liabilities:        
Investment contracts, included in contractholder funds 12,271,882 11,992,013    
Note payable   95,000    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | U.S. Government Securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 930,367 183,324    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Available-for-sale embedded derivatives [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale 248,087      
Derivatives, liabilities:        
Derivative investments   400    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Fixed Indexed Annuities Embedded Derivatives [Member]
       
Derivatives, liabilities:        
Derivative investments 1,550,805 1,396,340    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Future Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments 928      
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Futures Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments   3,828    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Asset-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,027,882 500,484    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Commercial mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 553,814 565,577    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Corporates [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 11,009,011 11,855,774    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Hybrids [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 528,295 659,289    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Municipals [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,223,995 936,484    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 154,890 222,025    
Recurring [Member] | Insurance and Financial Services [Member] | Fair Value [Member] | Non-agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 660,659 444,517    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member]
       
Assets        
Cash and cash equivalents 1,061,822 816,007    
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale   287,043    
Derivative investments 200,667 52,335    
Other invested assets   44,279    
Asset-backed loans and other invested assets 198,868      
Derivatives, liabilities:        
Investment contracts, included in contractholder funds 13,739,670 13,153,630    
Note payable   95,000    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | U.S. Government Securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 930,367 183,324    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Available-for-sale embedded derivatives [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale 248,087      
Derivatives, liabilities:        
Derivative investments   400    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Fixed Indexed Annuities Embedded Derivatives [Member]
       
Derivatives, liabilities:        
Derivative investments 1,550,805 1,396,340    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Future Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments 928      
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Futures Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments   3,828    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Asset-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,027,882 500,484    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Commercial mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 553,814 565,577    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Corporates [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 11,009,011 11,855,774    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Hybrids [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 528,295 659,289    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Municipals [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,223,995 936,484    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 154,890 222,025    
Recurring [Member] | Insurance and Financial Services [Member] | Carrying Amount [Member] | Non-agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 660,659 444,517    
Recurring [Member] | Level 1 [Member]
       
Short-term investments (including related interest receivable of $5)        
Total financial assets 2,545,670 1,555,977    
Derivatives, liabilities:        
Total financial liabilities 524,000 500,000    
Recurring [Member] | Level 1 [Member] | Consumer Products and Other [Member]
       
Assets        
Cash and cash equivalents 408,889 321,352    
Liabilities        
Total debt 524,000 500,000    
Recurring [Member] | Level 1 [Member] | Consumer Products and Other [Member] | Equity [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - trading 146,842 238,062    
Recurring [Member] | Level 1 [Member] | Insurance and Financial Services [Member]
       
Assets        
Cash and cash equivalents 1,059,572 813,239    
Recurring [Member] | Level 1 [Member] | Insurance and Financial Services [Member] | U.S. Government Securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 930,367 183,324    
Recurring [Member] | Level 2 [Member]
       
Short-term investments (including related interest receivable of $5)        
Total financial assets 15,482,740 15,095,868    
Derivatives, liabilities:        
Total financial liabilities 1,815,724 1,763,221    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member]
       
Liabilities        
Total debt 1,804,831 1,635,528    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member] | Foreign exchange forward agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 1,235 3,189    
Derivatives, liabilities:        
Derivative investments 9,956 25,679    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member] | Commodity swap and option agreements [Member]
       
Short-term investments (including related interest receivable of $5)        
Derivative investments 2,002 274    
Derivatives, liabilities:        
Derivative investments 9 1,232    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member] | Interest rate swap agreements [Member]
       
Derivatives, liabilities:        
Derivative investments   1,954    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member] | Equity [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - trading   24,023    
Recurring [Member] | Level 2 [Member] | Consumer Products and Other [Member] | Fixed maturities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities - held to maturity 35,000 75,899    
Equity securities - trading   12,665    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member]
       
Assets        
Cash and cash equivalents 2,250 2,768    
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale   287,043    
Derivative investments 200,667 52,335    
Derivatives, liabilities:        
Note payable   95,000    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Available-for-sale embedded derivatives [Member]
       
Short-term investments (including related interest receivable of $5)        
Equity securities - available-for-sale 248,087      
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Future Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments 928      
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Futures Contracts [Member]
       
Derivatives, liabilities:        
Derivative investments   3,828    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Asset-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,012,027 125,966    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Commercial mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 548,791 565,577    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Corporates [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 10,873,715 11,696,090    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Hybrids [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 519,422 654,084    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Municipals [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 1,223,995 936,484    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 154,890 218,713    
Recurring [Member] | Level 2 [Member] | Insurance and Financial Services [Member] | Non-agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 660,659 440,758    
Recurring [Member] | Level 3 [Member]
       
Short-term investments (including related interest receivable of $5)        
Total financial assets 404,915 590,757    
Derivatives, liabilities:        
Total financial liabilities 14,423,517 13,801,163    
Recurring [Member] | Level 3 [Member] | Consumer Products and Other [Member]
       
Assets        
Contingent purchase price reduction receivable 41,000      
Derivatives, liabilities:        
Equity conversion feature of preferred stock 231,950 75,350    
Redeemable preferred stock, excluding equity conversion feature 368,880 337,060    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member]
       
Short-term investments (including related interest receivable of $5)        
Other invested assets   44,279    
Asset-backed loans and other invested assets 198,868      
Derivatives, liabilities:        
Investment contracts, included in contractholder funds 12,271,882 11,992,013    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Available-for-sale embedded derivatives [Member]
       
Derivatives, liabilities:        
Derivative investments   400    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Fixed Indexed Annuities Embedded Derivatives [Member]
       
Derivatives, liabilities:        
Derivative investments 1,550,805 1,396,340    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Asset-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 15,855 374,518    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Commercial mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 5,023      
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Corporates [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 135,296 159,684    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Hybrids [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale 8,873 5,205    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale   3,312    
Recurring [Member] | Level 3 [Member] | Insurance and Financial Services [Member] | Non-agency residential mortgage-backed securities [Member]
       
Short-term investments (including related interest receivable of $5)        
Fixed maturity securities, available-for-sale   $ 3,759