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Derivative Financial Instruments - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
ozt
Mar. 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
ozt
T
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
ozt
T
Sep. 30, 2012
USD ($)
Derivative Financial Instruments [Line Items]            
Document Fiscal Year Focus     2017      
Document Period End Date     Mar. 31, 2017      
Net transfer In (Out) of Level 3 (a) $ (2,400,000) [1]   $ (29,500,000) [2]      
Call options purchased to match the funding requirements     Call options are one, two and three year options      
FGL purchases call options to fund the next index credit     One, two or three year call options to fund the next index credit      
Spectrum Brands [Member]            
Derivative Financial Instruments [Line Items]            
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months 3,800,000 $ 700,000 $ 8,600,000 $ 900,000    
Spectrum Brands [Member] | Standby Letters of Credit [Member]            
Derivative Financial Instruments [Line Items]            
Standby letters of credit 0   0     $ 0
Spectrum Brands [Member] | Silver Commodity Swap Contract [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Contracts Market Value $ 200,000   $ 200,000   $ 600,000  
Derivative, Nonmonetary Notional Amount | ozt 10.4   10.4   31.0  
Spectrum Brands [Member] | Foreign Exchange Contract [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Contracts Market Value $ 252,900,000   $ 252,900,000   $ 224,800,000  
Derivative net loss/gain     $ 1,300,000      
Spectrum Brands [Member] | ERROR in label resolution.            
Derivative Financial Instruments [Line Items]            
Weight Of Raw Material Under Derivative Contract | T     6.8   6.7  
Derivative Contracts Market Value 15,700,000   $ 15,700,000   $ 12,800,000  
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months     1,500,000      
Spectrum Brands [Member] | Foreign Exchange Forward [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Contracts Market Value 202,400,000   $ 202,400,000   $ 131,400,000  
Spectrum Brands [Member] | Bronze Commodity Contract [Member]            
Derivative Financial Instruments [Line Items]            
Weight Of Raw Material Under Derivative Contract | T     1.4   1.0  
Derivative Contracts Market Value 6,100,000   $ 6,100,000   $ 4,000,000  
Not Designated as Hedging Instrument [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Asset, Fair Value, Gross Asset 32,700,000   32,700,000   25,900,000  
Other assets [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member]            
Derivative Financial Instruments [Line Items]            
Derivative Asset, Fair Value, Gross Asset $ 10,500,000   $ 10,500,000   $ 5,900,000  
[1] (a) During the three months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.
[2] (a) During the six months ended March 31, 2017, the net transfer out of Level 3 was exclusively to Level 2.