Derivative Financial Instruments - Additional Information (Detail) bbl in Thousands, MMBTU in Thousands, MBbls in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) ozt MMBTU $ / MMBTU $ / bbl MBbls	Mar. 31, 2015 USD ($)	Mar. 31, 2016 USD ($) ozt MMBTU $ / MMBTU $ / bbl MBbls T	Mar. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) ozt MMBTU bbl T	Sep. 30, 2014 USD ($)
Derivative Financial Instruments [Line Items]
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
Derivative, Percentage of Production Volume Covered by Derivative Financial Instruments	20.00%	38.00%	44.00%	55.00%
Natural Gas Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Natural Gas, Volume | MMBTU	2,750,000		2,750,000
Oil Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative, Commodity Contract, Oil Volume | MBbls	138		138
Swap [Member] | Natural Gas Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Natural Gas, Volume | MMBTU					3,380
Swap [Member] | Oil Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative, Commodity Contract, Oil Volume | bbl					273
Spectrum Brands [Member]
Derivative Financial Instruments [Line Items]
Cash Collateral for Borrowed Securities	$ 500,000		$ 500,000		$ 3,500,000
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months	700,000	$ 7,000,000	900,000	$ 11,800,000
Spectrum Brands [Member] | Standby Letters of Credit [Member]
Derivative Financial Instruments [Line Items]
Standby letters of credit	0		$ 0			$ 0
Spectrum Brands [Member] | Zinc Commodity Swap Contract [Member]
Derivative Financial Instruments [Line Items]
Weight Of Raw Material Under Derivative Contract | T			9.4		10.8
Derivative Contracts Market Value	18,000,000		$ 18,000,000		$ 22,200,000
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months			800,000
Spectrum Brands [Member] | Foreign Exchange Forward [Member]
Derivative Financial Instruments [Line Items]
Derivative Contracts Market Value	262,400,000		262,400,000		126,800,000
Spectrum Brands [Member] | Silver Commodity Swap Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative Contracts Market Value	$ 200,000		$ 200,000		$ 400,000
Derivative, Nonmonetary Notional Amount | ozt	10		10		25
Spectrum Brands [Member] | Bronze Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Weight Of Raw Material Under Derivative Contract | T			1.0		1.8
Derivative Contracts Market Value	$ 4,400,000		$ 4,400,000		$ 8,500,000
Spectrum Brands [Member] | Interest Rate Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative, Fixed Interest Rate	1.36%		1.36%
Estimated amount of derivative net losses/gains to be reclassified from AOCI into earnings over the next twelve months			$ 800,000
Derivative, Notional Amount	$ 300,000,000		$ 300,000,000		$ 300,000,000
Derivative, Remaining Maturity			1 year		1 year 6 months
Spectrum Brands [Member] | Foreign Exchange Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative Contracts Market Value	$ 252,800,000		$ 252,800,000		$ 300,600,000
Derivative net loss/gain			$ 600,000
Remainder of 2014 [Member] | Swap [Member] | Natural Gas Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative, Average Forward Price | $ / MMBTU	2.38		2.38
Remainder of 2014 [Member] | Swap [Member] | Oil Commodity Contract [Member]
Derivative Financial Instruments [Line Items]
Derivative, Average Forward Price | $ / bbl	41.46		41.46
Not Designated as Hedging Instrument [Member]
Derivative Financial Instruments [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 15,200,000		$ 15,200,000		20,300,000
Other assets [Member] | Not Designated as Hedging Instrument [Member] | Call options [Member]
Derivative Financial Instruments [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 2,500,000		$ 2,500,000		$ 1,000,000