Derivative Financial Instruments - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($) ozt T	Sep. 30, 2015 USD ($) ozt T	Sep. 30, 2014 USD ($)	Sep. 30, 2012 USD ($)
Derivative Financial Instruments [Line Items]
Long-term debt		$ 5,540,700,000	$ 6,112,100,000
Spectrum Brands [Member]
Derivative Financial Instruments [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		1,100,000	27,500,000	$ (2,600,000)
Cash Collateral for Borrowed Securities			3,500,000
Spectrum Brands [Member] | Standby Letters of Credit
Derivative Financial Instruments [Line Items]
Letters of Credit Outstanding, Amount				$ 0	$ 0
Spectrum Brands [Member] | Interest Rate Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 400,000
Derivative, Fixed Interest Rate		0.00%
Derivative, Notional Amount		$ 300,000,000	$ 300,000,000
Derivative, Remaining Maturity		6 months	1 year 6 months
Spectrum Brands [Member] | Foreign exchange contracts
Derivative Financial Instruments [Line Items]
Accumulated Other Comprehensive Income Loss Cumulative Gain Loss From Derivative Instrument Before Tax		$ 1,900,000
Contract value		224,800,000	$ 300,600,000
Spectrum Brands [Member] | Foreign exchange forward agreements
Derivative Financial Instruments [Line Items]
Contract value		131,400,000	$ 126,800,000
Spectrum Brands [Member] | ERROR in label resolution.
Derivative Financial Instruments [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net		$ 1,100,000
Weight Of Raw Material Under Derivative Contract | T		6.7	10.8
Contract value		$ 12,800,000	$ 22,200,000
Spectrum Brands [Member] | ERROR in label resolution.
Derivative Financial Instruments [Line Items]
Derivative, Nonmonetary Notional Amount | ozt		31	25
Contract value		$ 600,000	$ 400,000
Spectrum Brands [Member] | Bronze Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Weight Of Raw Material Under Derivative Contract | T		1.0	1.8
Contract value		$ 4,000,000	$ 8,500,000
Other Liabilities [Member]
Derivative Financial Instruments [Line Items]
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax		11,000,000
Derivatives not designated as hedging instrument
Derivative Financial Instruments [Line Items]
Derivative Asset, Fair Value, Gross Asset		25,900,000	12,400,000
Derivatives not designated as hedging instrument | Other assets | Call options
Derivative Financial Instruments [Line Items]
Derivative Asset, Fair Value, Gross Asset		5,900,000	1,000,000
Other (expense) income, net | Currency Swap [Member]
Derivative Financial Instruments [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments		$ 2,400,000	$ (11,000,000)
Subsequent Event [Member] | Spectrum Brands [Member]
Derivative Financial Instruments [Line Items]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ 5,900,000