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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 |  |  |  |

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