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Goodwill and Intangibles - Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Goodwill And Intangible Assets [Line Items]      
Balance, Amortizable $ 857,114    
Less: Components of amortization:      
Amortization of intangible assets 224,322 46,580 45,920
Balance, Amortizable 873,861 857,114  
Insurance and Financial Services [Member]
      
Goodwill And Intangible Assets [Line Items]      
Balance, Amortizable 457,167    
Acquisition of FGL on April 6, 2011   577,163  
Deferrals 194,900 41,152  
Less: Components of amortization:      
Add: Adjustment for unrealized investment (gains), net (217,868) (172,263)  
Balance, Amortizable 273,543 457,167  
Insurance and Financial Services [Member] | Periodic amortization [Member]
      
Less: Components of amortization:      
Amortization of intangible assets (192,072) (702)  
Insurance and Financial Services [Member] | Interest [Member]
      
Less: Components of amortization:      
Amortization of intangible assets 30,825 14,040  
Insurance and Financial Services [Member] | Unlocking [Member]
      
Less: Components of amortization:      
Amortization of intangible assets 591 (2,223)  
Insurance and Financial Services [Member] | Value of Business Acquired [Member]
      
Goodwill And Intangible Assets [Line Items]      
Balance, Amortizable 419,060    
Acquisition of FGL on April 6, 2011   577,163  
Less: Components of amortization:      
Add: Adjustment for unrealized investment (gains), net (169,303) (170,117)  
Balance, Amortizable 104,320 419,060  
Insurance and Financial Services [Member] | Value of Business Acquired [Member] | Periodic amortization [Member]
      
Less: Components of amortization:      
Amortization of intangible assets (171,833) 294  
Insurance and Financial Services [Member] | Value of Business Acquired [Member] | Interest [Member]
      
Less: Components of amortization:      
Amortization of intangible assets 28,883 14,040  
Insurance and Financial Services [Member] | Value of Business Acquired [Member] | Unlocking [Member]
      
Less: Components of amortization:      
Amortization of intangible assets (2,487) (2,320)  
Insurance and Financial Services [Member] | Deferred acquisition costs [Member]
      
Goodwill And Intangible Assets [Line Items]      
Balance, Amortizable 38,107    
Deferrals 194,900 41,152  
Less: Components of amortization:      
Add: Adjustment for unrealized investment (gains), net (48,565) (2,146)  
Balance, Amortizable 169,223 38,107  
Insurance and Financial Services [Member] | Deferred acquisition costs [Member] | Periodic amortization [Member]
      
Less: Components of amortization:      
Amortization of intangible assets (20,239) (996)  
Insurance and Financial Services [Member] | Deferred acquisition costs [Member] | Interest [Member]
      
Less: Components of amortization:      
Amortization of intangible assets 1,942    
Insurance and Financial Services [Member] | Deferred acquisition costs [Member] | Unlocking [Member]
      
Less: Components of amortization:      
Amortization of intangible assets $ 3,078 $ 97