Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2015	Sep. 30, 2013
Income Taxes [Line Items]
Income Tax Examination, Penalties and Interest Accrued	$ 3.2	$ 2.8
Unrecognized Tax Benefits	47.9	16.1	$ 12.6		$ 13.8
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	331.6	309.0
Deferred Tax Assets, Valuation Allowance	512.1	894.2
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	$ (42.3)	190.8	$ (31.8)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%		35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	$ 0.0	(9.9)	$ 0.0
Operating Loss Carryforwards	25.6
Deferred income taxes	$ (4.8)	$ (46.4)	$ 23.4
Effective Income Tax Rate Reconciliation, Percent	17.90%	5.30%	86.20%
Deferred Tax Assets, Investment in Subsidiaries	$ 51.1	$ 217.3
Increase Decrease Interest And Penalties	0.4	0.9
Discontinued Operations [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	5.9
FOH [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount		(22.8)
HGI
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	266.4	594.5
Spectrum Brands [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Amount	25.5
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	59.7	27.7	$ 121.5
Tax Adjustments, Settlements, and Unusual Provisions	87.8
Deferred income taxes	38.4
Deferred Tax Assets, Investment in Subsidiaries		23.3
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	14.4
Foreign Earnings Repatriated	102.0
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount	36.7	0.3
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	460.4
Deferred Federal, State and Local, Tax Expense (Benefit)	$ 7.6
Operating Loss Carryforwards, Expiration Date	Jan. 01, 2036
U S Federal [Member] | HGI
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 1,170.5	815.3
Capital Loss Carryforwards		77.8
U S Federal [Member] | Spectrum Brands [Member]
Income Taxes [Line Items]
Deferred income taxes	265.6
State and Local Jurisdiction [Member] | HGI
Income Taxes [Line Items]
Operating Loss Carryforwards	93.9	109.8
Domestic Tax Authority [Member] | HGI
Income Taxes [Line Items]
Capital Loss Carryforwards	322.4
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	373.8	248.6
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member] | Spectrum Brands [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	65.0	30.4	122.6
Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member] | Spectrum Brands [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	5.3	2.7	1.1
Deferred Tax Assets, Valuation Allowance, US State and Local Income Taxes [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		60.4
Deferred Tax Assets, Valuation Allowance, Asset Impairments [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	89.5
Deferred Tax Assets, Valuation Allowance, Restructuring Related Charges [Member] | Spectrum Brands [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		22.8	$ 62.6
Deferred Tax Assets, Valuation Allowance, Business Combinations [Member] | Spectrum Brands [Member]
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		17.0
Spectrum Brands [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	245.7	305.4
Foreign Earnings Repatriated		37.5
Cumulative Unremitted Earnings	93.6
Undistributed Earnings of Foreign Subsidiaries	219.4
Spectrum Brands [Member] | Accounting Standards Update 2016-09 [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	25.1
Spectrum Brands [Member] | U S Federal [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	203.7	268.7		$ 16.2
Operating Loss Carryforwards	758.9
Spectrum Brands [Member] | Foreign Tax Authority [Member]
Income Taxes [Line Items]
Deferred Tax Assets, Valuation Allowance	42.0	$ 36.7		$ 3.1
Operating Loss Carryforwards	136.3
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	35.4
Spectrum Brands [Member] | State and Local Jurisdiction [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	60.6
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	16.7
Spectrum Brands [Member] | Domestic Tax Authority [Member]
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	111.1
Capital Loss Carryforwards	19.8
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration	161.1
Additional Paid-in Capital | Spectrum Brands [Member] | U S Federal [Member]
Income Taxes [Line Items]
Operating Loss Carryforwards	$ 4.3