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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |
Document Period End Date | Dec. 31, 2017 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 35.00% |
Income tax (benefit) expense | $ (126.0) | $ 5.6 |
Deferred income taxes | $ (127.1) | $ 18.5 |
Effective Income Tax Rate Reconciliation, Percent | 263.00% | (15.40%) |
U S Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | $ 387.9 |  |
HGI |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 430.8 |  | $ 703.2
HGI | U S Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | 1,565.1 |  | 1,524.3
Capital Loss Carryforwards | 423.1 |  | 315.9
FGL [Member] |  |  |
Income Taxes [Line Items] |  |  |
Deferred Tax Assets, Valuation Allowance | 34.4 |  | 58.1
FGL [Member] | U S Federal [Member] |  |  |
Income Taxes [Line Items] |  |  |
Operating Loss Carryforwards | 149.1 |  | 151.1
FGL [Member] | Domestic Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Capital Loss Carryforwards | 15.0 |  | $ 15.0
H G I [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 287.2 |  |
Spectrum Brands [Member] |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 623.1 |  |
Undistributed Earnings of Foreign Subsidiaries | 1.0 |  |
Spectrum Brands [Member] | Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 78.8 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 78.8 |  |
Spectrum Brands [Member] | Deferred Tax Assets, Valuation Allowance, US State and Local Income Taxes [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 41.4 |  |
Income tax (benefit) expense | $ 206.7 |  |

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