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Fair Value of Financial Instruments - Changes in Fair Value of Financial Instruments (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2013
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value Assets, level 1 to level 2 transfers     $ 0 $ 0
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period $ 1,066,000,000 $ 206,000,000 1,066,000,000 523,500,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (100,000) (6,800,000) 1,700,000
Total Gains (Losses) Included in AOCI   (14,000,000) 9,900,000 22,200,000
Purchases   428,200,000 323,200,000 570,500,000
Sales   (20,300,000) (1,600,000) (12,100,000)
Settlements   (23,300,000) (142,200,000) (15,900,000)
Net transfer In (Out) of Level 3 (a) (34,500,000) (53,000,000) [1] (15,400,000) [2] (23,900,000) [3]
Balance at End of Period     1,233,100,000 1,066,000,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 2,059,400,000 1,782,800,000 2,059,400,000 1,875,200,000
Total Gains (Losses) Included in Earnings   95,200,000 266,000,000 383,400,000
Total Gains (Losses) Included in AOCI     0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0 445,400,000 150,600,000
Sales   0 0 0
Settlements   (2,800,000) 7,800,000 (349,800,000)
Net transfer In (Out) of Level 3   0 [1] 0 [2] 0 [3]
Balance at End of Period     2,778,600,000 2,059,400,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3     0 30,900,000 [2]
Embedded Derivatives Included In Contractholder Funds [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 1,908,100,000 1,550,800,000 1,908,100,000 1,544,400,000
Total Gains (Losses) Included in Earnings   (6,400,000) 241,300,000 363,700,000
Total Gains (Losses) Included in AOCI       0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases       0
Sales       0
Settlements       0
Net transfer In (Out) of Level 3 [3]       0
Balance at End of Period     2,149,400,000 1,908,100,000
Front Street Future Policyholder Benefits Reserve [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 151,300,000   151,300,000  
Total Gains (Losses) Included in Earnings     24,700,000 7,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases     445,400,000 150,600,000
Settlements     7,800,000 (6,300,000)
Balance at End of Period     629,200,000 151,300,000
Equity Conversion Features Of Preferred Stock [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 0 232,000,000 0 330,800,000
Total Gains (Losses) Included in Earnings   101,600,000   12,700,000
Total Gains (Losses) Included in AOCI       0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases       0
Sales   0   0
Settlements       (343,500,000)
Net transfer In (Out) of Level 3 [3]       0
Balance at End of Period       0
Available-for-sale embedded derivatives        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total Gains (Losses) Included in AOCI   0   0
Equity Conversion Features Of Preferred Stock [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total Gains (Losses) Included in AOCI   0    
Net transfer In (Out) of Level 3 (a) [1]   0    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0    
Settlements   (2,800,000)    
Asset-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 37,000,000 15,900,000 37,000,000 5,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0 100,000  
Total Gains (Losses) Included in AOCI   (200,000) (100,000) (300,000)
Purchases   0 14,200,000 36,100,000
Sales   0    
Settlements   (200,000) (30,700,000)  
Net transfer In (Out) of Level 3 (a)   (10,500,000) [1] (10,400,000) [2] (3,800,000) [3]
Balance at End of Period     10,100,000 37,000,000
Commercial mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 83,100,000 5,000,000 83,100,000 5,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0    
Total Gains (Losses) Included in AOCI   (300,000) (1,800,000)  
Purchases   1,000,000 63,900,000 83,700,000
Sales   0   (300,000)
Settlements   0 (1,600,000)  
Net transfer In (Out) of Level 3 (a)   0 [1]   (6,000,000) [3]
Balance at End of Period     143,600,000 83,100,000
Corporates        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 850,000,000 135,300,000 850,000,000 461,100,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   (300,000) 1,900,000  
Total Gains (Losses) Included in AOCI   (13,400,000) 10,100,000 19,100,000
Purchases   406,000,000 201,400,000 398,100,000
Sales   (9,600,000) (1,600,000) (11,800,000)
Settlements   (23,100,000) (59,500,000) (2,400,000)
Net transfer In (Out) of Level 3 (a)   (33,800,000) [1] (24,100,000) [2] (14,100,000) [3]
Balance at End of Period     978,200,000 850,000,000
Hybrids        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period   8,800,000   0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0    
Total Gains (Losses) Included in AOCI   (100,000)    
Purchases   0    
Sales   0    
Settlements   0    
Net transfer In (Out) of Level 3 (a) [1]   (8,700,000)    
Municipals        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 37,200,000   37,200,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     0  
Total Gains (Losses) Included in AOCI     1,700,000 2,200,000
Purchases     0 35,000,000
Sales     0  
Settlements     (400,000)  
Net transfer In (Out) of Level 3 (a) [2]     0  
Balance at End of Period     38,500,000 37,200,000
Held for trading        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 0 0 0 10,700,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0   1,300,000
Total Gains (Losses) Included in AOCI   0   0
Purchases   10,700,000   1,500,000
Sales   0   0
Settlements   0   (13,500,000)
Net transfer In (Out) of Level 3 (a)   0 [1]   0 [3]
Balance at End of Period       0
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 6,000,000   6,000,000 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   200,000 0 0
Total Gains (Losses) Included in AOCI     0 1,200,000
Purchases   10,500,000 24,500,000 4,800,000
Sales   (10,700,000) 0 0
Settlements   0 0 0
Net transfer In (Out) of Level 3 (a)     0 [2] 0 [3]
Balance at End of Period     30,500,000 6,000,000
Other invested assets        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 11,200,000   11,200,000 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     (17,300,000) (100,000)
Total Gains (Losses) Included in AOCI     0 0
Purchases     0 11,300,000
Sales     0 0
Settlements     0 0
Net transfer In (Out) of Level 3 (a)     19,100,000 [2] 0 [3]
Balance at End of Period     13,000,000 11,200,000
Funds withheld for reinsurance liability [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period 0   0  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings     0  
Total Gains (Losses) Included in AOCI     0  
Purchases     19,200,000  
Sales     0  
Settlements     0  
Net transfer In (Out) of Level 3 (a) [2]     0  
Balance at End of Period     19,200,000 0
Embedded Derivatives Included In Contractholder Funds [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Total Gains (Losses) Included in AOCI   0    
Net transfer In (Out) of Level 3 (a) [1]   0    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases   0    
Sales   0    
Settlements   0    
Contingent Purchase Price Reduction Receivable [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period $ 41,500,000 41,000,000 41,500,000 41,000,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings   0 8,500,000 500,000
Total Gains (Losses) Included in AOCI   0    
Purchases   0    
Sales   0    
Settlements   0 $ (50,000,000)  
Net transfer In (Out) of Level 3 (a) [1]   0    
Balance at End of Period       41,500,000
Equity Securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at Beginning of Period   0   $ 0
Total Gains (Losses) Included in AOCI   0    
Net transfer In (Out) of Level 3 (a) [1]   $ 0    
[1] (a) The net transfers out of Level 3 during Fiscal 2013 were exclusively to Level 2.
[2] (a) During Fiscal 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[3] (a) The net transfers in and out of Level 3 during Fiscal 2014 were exclusively to or from Level 2.