Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2012	Jun. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Jun. 23, 2015	Feb. 27, 2015	Dec. 13, 2013	Sep. 30, 2013	Feb. 28, 2013
Debt Instrument [Line Items]
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options				$ 4.1	$ 2.8
Long-term debt			$ 5,540.7	6,112.1
Repayments of Other Debt			1,090.8	3,050.5	770.9
Write-off of discounts and debt issuance costs on retired debt			5.8	12.8	9.2
Amortization of debt issuance costs			18.3	17.2	16.2
Payments of Debt Issuance Costs			9.3	44.8	15.8
Other assets (Note 13)			172.6	412.0
Interest Expense			397.1	401.6	298.8
Debt Instrument, Unamortized Discount (Premium), Net			22.8	25.7
Other Deferred Costs, Gross			87.0
Amortization of debt discount			$ 2.8	4.8	4.6
Euro Term Loan, Due June 23, 2022 [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
FGL [Member]
Debt Instrument [Line Items]
Sale of Stock, Price Per Share								$ 17.00
HGI
Debt Instrument [Line Items]
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options			$ 4.4
Long-term debt			1,711.2	1,705.1
Amortization of debt issuance costs			2.7	4.4	3.5
Payments of Debt Issuance Costs			0.0	6.8	10.4
Interest Expense			143.1	124.2	89.7
Amortization of debt discount			$ 3.3	$ 1.8	$ 1.5
HGI | 7.875% Senior Secured Notes, due July 15, 2019
Debt Instrument [Line Items]
Debt instrument principal amount redemption percentage			35.00%
Original maturity date			90 days
Required Debt Principal Outstanding Subsequent to Equity Financed Redemption, Percent			65.00%
HGI | 7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 864.4
Long-term debt, interest rate			7.875%	7.90%
Long-term Debt, Maturities, Repayments of Principal in Year Five				$ 864.4
HGI | Seven Point Seven Five Percent Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Long-term debt			$ 890.0	$ 890.0
Long-term debt, interest rate			7.75%	7.75%
Redemption price of debt instrument to percentage of principal amount			100.00%
Proceeds from repurchase of equity, percentage	107.75%
Spectrum Brands [Member] | Letter of Credit [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 466.2
Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt			$ 425.0
Redemption price of debt instrument to percentage of principal amount			100.00%
Debt instrument principal amount redemption percentage			35.00%
Minimum percentage of aggregate outstanding principal held by registered holders			25.00%
Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 477.0	$ 0.0
Long-term debt, interest rate			4.00%	0.00%
Deferred Finance Costs, Gross			$ 7.7
Spectrum Brands [Member] | CAD Term Loan, Due June 23, 2022 [Member] | Interest Rate Floor [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.75%
Spectrum Brands [Member] | CAD Term Loan, Due June 23, 2022 [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			3.50%
Spectrum Brands [Member] | CAD Term Loan, Due June 23, 2022 [Member] | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.50%
Spectrum Brands [Member] | Euro Term Loan, Due June 23, 2022 [Member] | Interest Rate Floor [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.75%
Spectrum Brands [Member] | Revolving Credit Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 1.1
Deferred Finance Costs, Gross			$ 5.7
Spectrum Brands [Member] | Revolving Credit Facility [Member] | Minimum [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.75%
Spectrum Brands [Member] | Revolving Credit Facility [Member] | Minimum [Member] | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.75%
Spectrum Brands [Member] | Revolving Credit Facility [Member] | Maximum | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			3.00%
Spectrum Brands [Member] | Revolving Credit Facility [Member] | Maximum | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.00%
Spectrum Brands [Member] | 6.375% Senior Notes due 2020
Debt Instrument [Line Items]
Write-off of discounts and debt issuance costs on retired debt			$ 5.8
Spectrum Brands [Member] | 6.375% Senior Notes due 2020 | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 129.7	$ 520.0
Long-term debt, interest rate			6.375%
Debt Instrument, Repurchase Amount			$ 390.3
Long-term Debt, Maturities, Repayments of Principal in Year Five			129.7
Debt Instrument, Unamortized Premium, Current			4.6
Deferred Finance Costs, Gross			12.9
Spectrum Brands [Member] | 6.625% Notes | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			570.0	$ 570.0
Long-term debt, interest rate				6.40%
Deferred Finance Costs, Gross			14.1
Spectrum Brands [Member] | Five Point Seven Five Percentage Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt			1,000.0
Spectrum Brands [Member] | Five Point Seven Five Percentage Senior Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Gross			19.7
Spectrum Brands [Member] | 6.375% Notes and 6.625% Notes
Debt Instrument [Line Items]
Minimum percentage of aggregate outstanding principal held by registered holders		25.00%
Spectrum Brands [Member] | Six Point One Two Five Percentage Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt			$ 250.0	$ 250.0
Long-term debt, interest rate			6.125%	6.10%
Redemption price of debt instrument to percentage of principal amount			100.00%
Debt instrument principal amount redemption percentage			35.00%
Spectrum Brands [Member] | Six Point One Two Five Percentage Senior Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Gross			$ 4.6
Spectrum Brands [Member] | Six Point Seven Five Percentage Senior Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt, interest rate			6.625%	6.60%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount, Noncurrent			$ 5.1
Deferred Finance Costs, Gross			18.5
Other Deferred Costs, Gross			8.1
Amortization of Financing Costs and Discounts			10.4
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net			$ 7.7
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Interest Rate Floor [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.75%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.50%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.50%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Minimum [Member] | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.75%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Minimum [Member] | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			1.75%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Maximum | Interest Rate Cap [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			3.00%
Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Maximum | ABR
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			2.00%
Spectrum Brands [Member] | Abl Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			$ 24.6
Spectrum Brands [Member] | Abl Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt			0.0	$ 0.0
Revolving Loan Facility			$ 500.0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.00%	0.00%
Spectrum Brands Foreign Subsidiaries [Member] | Abl Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity			$ 9.2
HGI Energy Holdings, LLC | Nine point zero percent senior secured notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt				$ 50.0
Gain (Loss) on Extinguishment of Debt			$ 4.0
Extinguishment of Debt, Gain (Loss), Per Share, Net of Tax			$ 0.02
Long-term debt, interest rate				9.00%
HGI Energy Holdings, LLC | Zero point zero seven one percent [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 46.0
Salus Capital Partners LLC | Variable Interest Entity, Primary Beneficiary
Debt Instrument [Line Items]
VIE, consolidated carrying amount obligations			135.2	$ 356.8
Asset-based loans									$ 331.1	$ 175.5
Salus Capital Partners LLC | Unaffiliated long-term debt of consolidated variable-interest entity
Debt Instrument [Line Items]
Long-term debt			$ 39.7	$ 40.4
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.00%	0.00%
VIE, consolidated carrying amount obligations			$ 38.9	$ 39.5
Salus Capital Partners LLC | Secured Borrowings Related to non-qualifying participating loan interests [Member]
Debt Instrument [Line Items]
Long-term debt			$ 2.0	$ 8.8
Long-term debt, interest rate			0.00%	10.50%
Salus Capital Partners LLC | Collateralized Loan Obligations [Member]
Debt Instrument [Line Items]
Long-term debt							$ 578.5
Euro Member Countries, Euro | Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 425.0
Euro Member Countries, Euro | Spectrum Brands [Member] | Euro Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			300.0	$ 255.8
United States of America, Dollars | Spectrum Brands [Member] | CAD Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			54.9	$ 55.7
United States of America, Dollars | Spectrum Brands [Member] | Euro Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 63.0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			3.50%	3.50%
United States of America, Dollars | Spectrum Brands [Member] | Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 1,005.5	$ 1,226.9		$ 1,450.0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			3.60%	3.90%
Canada, Dollars | Spectrum Brands [Member] | CAD Term Loan, Due June 23, 2022 [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt			$ 75.0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			4.60%	4.40%
6.375% Senior Notes due 2020 | Spectrum Brands [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Deferred Finance Costs, Gross			$ 6.5
Debt Instrument, Unamortized Premium, Noncurrent			15.6
FGL [Member] | Salus Capital Partners LLC | Unaffiliated long-term debt of consolidated variable-interest entity
Debt Instrument [Line Items]
Long-term debt			$ 63.0	$ 274.0
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate			0.00%	3.90%
FGL [Member] | Salus Capital Partners LLC | Secured Borrowings Related to non-qualifying participating loan interests [Member]
Debt Instrument [Line Items]
Long-term debt				$ 4.2
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate				4.50%
FGL [Member] | Salus Capital Partners LLC | Salus Promissory Note [Member]
Debt Instrument [Line Items]
Long-term debt				$ 2.5
Long-term debt, interest rate				5.30%