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Derivative Financial Instruments - Additional Information (Detail) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2014
Futures contracts
Contract
Sep. 30, 2013
Futures contracts
Contract
Sep. 30, 2014
Nomura Fund Linked Note [Member]
Jun. 06, 2014
Nomura Fund Linked Note [Member]
Sep. 30, 2014
Call options
Sep. 30, 2013
Call options
Sep. 30, 2014
Swap
Natural Gas Commodity Contract
MMBTU
Sep. 30, 2013
Swap
Natural Gas Commodity Contract
MMBTU
Sep. 30, 2014
Swap
Oil Commodity Contract
MBbls
Sep. 30, 2013
Swap
Oil Commodity Contract
MBbls
Sep. 30, 2014
Spectrum Brands
Sep. 30, 2012
Spectrum Brands
Sep. 30, 2014
Spectrum Brands
Standby Letters of Credit
Sep. 30, 2012
Spectrum Brands
Standby Letters of Credit
Sep. 30, 2014
Spectrum Brands
Zinc Commodity Swap Contract
T
Sep. 30, 2012
Spectrum Brands
Zinc Commodity Swap Contract
T
Sep. 30, 2014
Spectrum Brands
Brass Commodity Contract
T
Sep. 30, 2014
Spectrum Brands
Silver Commodity Swap Contract
ozt
Sep. 30, 2013
Spectrum Brands
Silver Commodity Swap Contract
ozt
Sep. 30, 2014
Spectrum Brands
Foreign exchange contracts
Sep. 30, 2012
Spectrum Brands
Foreign exchange contracts
Sep. 30, 2014
Remainder of 2013
Swap
Natural Gas Commodity Contract
MMBTU
Sep. 30, 2014
Remainder of 2013
Swap
Oil Commodity Contract
MBbls
Sep. 30, 2014
2014
Swap
Natural Gas Commodity Contract
MMBTU
Sep. 30, 2014
2014
Swap
Oil Commodity Contract
MBbls
Sep. 30, 2014
Cash and Cash Equivalents [Member]
Call options
Sep. 30, 2013
Cash and Cash Equivalents [Member]
Call options
Sep. 30, 2014
Bank of America
Sep. 30, 2013
Bank of America
Sep. 30, 2014
Derivatives not designated as hedging instrument
Bank of America
Derivatives
Call options
Sep. 30, 2013
Derivatives not designated as hedging instrument
Bank of America
Derivatives
Call options
Derivative Financial Instruments [Line Items]                                                                    
Derivative, Nonmonetary Notional Amount                                         25 45                        
Other invested assets $ 165,000,000 $ 31,200,000       $ 11,200,000                                                        
Available-for-sale Securities, Debt Securities           21,600,000                                                        
Derivative Asset, Collateral, Obligation to Return Cash, Offset               188,000,000 72,000,000                                       135,500,000 72,000,000     52,500,000 0
Natural Gas, Volume                   6,821,000.0 16,018,000                           4,106,000.0   2,715,000.0              
Derivative, Commodity Contract, Oil Volume                       254,000.0 375.0                         68,000.0   186,000.0            
Contract value                                   17,400,000 16,200,000 2,800,000 400,000 1,000,000 226,700,000 255,900,000                    
Derivative net loss/gain                                             5,200,000 1,400,000                    
Derivative net loss/gain, net of tax benefit/expense                                             3,400,000 (600,000)                    
Derivative net loss/gain, non-controlling interest                                             3,700,000 900,000                    
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months (2,600,000) 900,000 (3,100,000)                                       5,100,000                      
Derivative, Notional Amount 7,602,600,000 6,407,400,000                       108,900,000 108,500,000                               2,239,900,000 2,037,800,000    
Weight of raw materials under derivative contract                                   8 8 1                            
Derivative, average forward price                                                 90.72 4.16 88.08 4.00            
Percentage of production volume covered by derivative financial instruments 72.00% 74.00%                                                                
Cash collateral       10,800,000 5,900,000                   500,000                                      
Credit Derivative, Maximum Exposure, Undiscounted 108,300,000   149,800,000                                                              
Letters of Credit Outstanding, Amount                               0 0                                  
Number of instruments held       2,348 1,693                                                          
Investment Owned, Balance, Principal Amount             35,000,000                                                      
Embedded Derivative, Fair Value of Embedded Derivative Liability             $ 11,300,000