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Basis of Preparation and Nature of Operations Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |
Number of reporting segments | 2 |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.01
Long-term debt | $ 5,915.1 | $ 5,802.2 |
Document Period End Date | Dec. 31, 2017 |  |
HGI Energy Holdings, LLC [Member] | Zero point seven one percent [Member] | Secured Debt [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Long-term debt, interest rate |  | 1.50% |
Long-term debt |  | $ 92.0 |
Front Street Re (Delaware) Ltd. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Proceeds from Divestiture of Businesses | $ 65.0 |  |
Deposit Liabilities, Description | 6.5 |  |
Spectrum Brands [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage Of Ownership Interest | 59.30% |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 40.70% |  |
Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Long-term debt, interest rate | 4.00% |  |
HGI | 7.875% Senior Secured Notes, due July 15, 2019 |  |  |
Business Acquisition [Line Items] |  |  |
Redemption Price Of Debt Instrument To Percentage Of Principal Amount | 100.00% |  |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in Year Two | $ 864.4 |  |
HGI | 7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Long-term debt, interest rate | 7.875% | 7.90% |
Long-term Debt, Maturities, Repayments of Principal in Year Five |  | $ 864.4 |
FS Holdco II Ltd. [Domain] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net | $ 26.6 |  |
Zap Com Corporation [Member] | Zap Com Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage Of Ownership Interest | 99.50% |  |
FGL [Member] | CF Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Share Price | $ 31.10 |  |

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