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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ 10.4 |  |  |  |
Document Period End Date |  |  | Mar. 31, 2018 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |  | 35.00%
Income tax (benefit) expense | $ (1.2) | $ 24.0 | $ (127.2) | $ 29.6 |
Deferred income taxes |  |  | $ (151.6) | $ (1.5) |
Effective Income Tax Rate Reconciliation, Percent | 3.10% | 148.10% | 147.20% | (146.50%) |
U S Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards | $ 387.9 |  | $ 387.9 |  |
HGI |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | 441.2 |  | 441.2 |  | $ 703.2
HGI | U S Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  | 1,524.3
Capital Loss Carryforwards |  |  |  |  | 315.9
FGL [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Assets, Valuation Allowance | 34.4 |  | 34.4 |  | 58.1
FGL [Member] | U S Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  | 151.1
FGL [Member] | Domestic Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Capital Loss Carryforwards |  |  |  |  | $ 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] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 4.9 |  |  |  |
Increase in Unrecognized Tax Benefits is Reasonably Possible | 41.9 |  | 41.9 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | 613.1 |  |
Undistributed Earnings of Foreign Subsidiaries | 1.0 |  | 1.0 |  |
Spectrum Brands [Member] | Other Current Liabilities [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 6.3 |  | 6.3 |  |
Spectrum Brands [Member] | Other Liabilities [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 71.7 |  | 71.7 |  |
Spectrum Brands [Member] | Deferred Tax Assets, Valuation Allowance, Foreign Income Taxes [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | 78.0 |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  | 78.0 |  |
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 | $ 5.5 |  | 35.9 |  |
Income tax (benefit) expense |  |  | $ 206.7 |  |

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