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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 | Jan. 13, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |
Goodwill | $ 2,473.8 |  | $ 2,478.4
Document Period End Date | Mar. 31, 2017 |  |
Funds Withheld Receivable | $ 1,634.2 |  | 1,650.4
Long-term Debt | 5,727.0 |  | 5,540.7
Margin Loan, due July 13, 2018 [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Security Owned and Pledged as Collateral, Fair Value |  | $ 583.8 |
Margin Loan, due July 13, 2018 [Member] | Secured Debt [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Debt Issuance Costs, Gross |  | 1.1 |
Line of Credit Facility, Maximum Borrowing Capacity |  | 150.0 |
Long-term Debt | $ 50.0 | $ 50.0 | $ 0.0
Zap Com Corporation [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage Of Ownership Interest | 99.50% |  |
Spectrum Brands [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage Of Ownership Interest | 58.40% |  |
FGL [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage Of Ownership Interest | 80.40% |  |
Interest Rate Cap [Member] | Margin Loan, due July 13, 2018 [Member] | Secured Debt [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate | 3.50% | 2.35% | 0.00%

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