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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | Feb. 28, 2017 | Sep. 30, 2014
Income Taxes [Line Items] |  |  |  |  |  |
Income Tax Examination, Penalties and Interest Accrued |  | $ 2.9 | $ 3.0 |  |  |
Unrecognized Tax Benefits |  | 20.9 | 16.5 | $ 12.4 |  | $ 7.6
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 206.7 | 281.4 | 309.0 |  |
Deferred Tax Assets, Valuation Allowance |  | 946.7 | 532.3 |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  | $ 81.5 | (65.0) | 180.3 |  |
Document Period End Date |  | Sep. 30, 2017 |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 35.00% |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount |  | $ 0.0 | 0.0 | (9.9) |  |
Operating Loss Carryforwards |  |  |  |  | $ 37.0 |
Deferred income taxes |  | $ 21.9 | $ (73.6) | $ (10.9) |  |
Effective Income Tax Rate Reconciliation, Percent | (634.80%) | (122.50%) | (634.80%) | (0.40%) |  |
Deferred Tax Assets, Investment in Subsidiaries |  | $ 49.0 | $ 51.1 |  |  |
Increase Decrease Interest And Penalties |  | 0.1 | 0.5 | $ 0.8 |  |
Parent Company [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 703.2 | 313.1 |  |  |
FGL [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 58.1 | 48.8 |  |  |
FS Holdco II Ltd. [Domain] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | 145.3 |  |  |
Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 20.8 | 63.7 |  |  |
Tax Adjustments, Settlements, and Unusual Provisions |  |  | 87.8 |  |  |
Operating Loss Carryforwards |  |  | 111.1 |  |  |
Deferred income taxes |  | 47.4 |  |  |  |
Foreign Earnings Repatriated |  | 1.6 | 3.0 | 23.3 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  | 5.7 | 1.9 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 468.9 |  |  |  |
Deferred Federal, State and Local, Tax Expense (Benefit) |  | $ 7.5 |  |  |  |
Operating Loss Carryforwards, Expiration Date |  | Jan. 01, 2037 |  |  |  |
U S Federal [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | $ 395.0 |  |  |  |
U S Federal [Member] | Parent Company [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | 1,524.3 | 1,304.1 |  |  |
Capital Loss Carryforwards |  |  | 322.4 |  |  |
U S Federal [Member] | FGL [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | 151.1 | 133.6 |  |  |
U S Federal [Member] | Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred income taxes |  | 246.2 |  |  |  |
State and Local Jurisdiction [Member] | Parent Company [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | 0.0 | 93.9 |  |  |
Domestic Tax Authority [Member] | Parent Company [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Capital Loss Carryforwards |  | 315.9 |  |  |  |
Domestic Tax Authority [Member] | FGL [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Capital Loss Carryforwards |  | 15.0 | 6.0 |  |  |
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 390.1 |  | 248.6 |  |
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member] | FGL [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 352.7 |  |  |  |
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member] | Front Street RE (Cayman) Ltd. [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 36.5 |  |  |  |
Deferred Tax Assets, Valuation Allowance, Domestic Income Taxes [Member] | Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 13.4 | 65.0 |  |  |
Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member] | Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 6.6 | 14.7 | 17.0 |  |
Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member] | Foreign Tax Authority [Member] | Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  | 7.4 | 1.3 |  |  |
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, Business Combinations [Member] | Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  | 22.8 |  |
Spectrum Brands [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 243.5 | 222.7 |  |  |
Tax Credit Carryforward, Valuation Allowance |  |  | 16.2 |  |  |
Undistributed Earnings of Foreign Subsidiaries |  | 302.5 |  |  |  |
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 |  | 217.1 | 203.7 |  |  |
Operating Loss Carryforwards |  | 703.5 |  |  |  |
Spectrum Brands [Member] | Foreign Tax Authority [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  | 26.4 | 19.0 |  |  |
Operating Loss Carryforwards |  | 169.2 |  | $ 14.4 |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration |  | 45.7 |  |  |  |
Spectrum Brands [Member] | State and Local Jurisdiction [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | 70.8 |  |  |  |
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 |  | 164.1 |  |  |  |
Additional Paid-in Capital | Spectrum Brands [Member] | U S Federal [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating Loss Carryforwards |  | $ 4.3 |  |  |  |

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