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Description of Business, Basis of Presentation and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Apr. 17, 2017 | Jun. 30, 2017 | Jun. 30, 2017 | May 06, 2017 | Jan. 13, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 2,621.3 | $ 2,621.3 |  |  | $ 2,478.4
Document Period End Date |  |  | Jun. 30, 2017 |  |  |
Long-term Debt |  | 6,133.6 | $ 6,133.6 |  |  | 5,635.6
Margin Loan, due July 13, 2018 [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Security Owned and Pledged as Collateral, Fair Value |  |  |  |  | $ 525.2 |
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% | 99.50% |  |  |
Front Street Re (Delaware) Ltd. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from Divestiture of Businesses |  | $ 65.0 |  |  |  |
Spectrum Brands [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage Of Ownership Interest |  | 58.90% | 58.90% |  |  |
Spectrum Brands [Member] | Secured Debt [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt, interest rate |  | 6.625% | 6.625% |  |  |
FGL [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage Of Ownership Interest |  | 80.40% | 80.40% | 50.00% |  |
FS Holdco II Ltd. [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Due to Affiliate |  | $ 30.0 | $ 30.0 |  |  |
Shaser, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description |  |  | 0.44 |  |  |
Business Combination, Consideration Transferred |  |  | $ 12.6 |  |  |
Petmatrix LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | 123.8 | 123.8 |  |  |
Business Combination, Consideration Transferred | $ 255.2 |  |  |  |  |
GloFish [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  | $ 15.4 | 15.4 |  |  |
Business Combination, Consideration Transferred |  |  | 53.9 |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 49.7 |  |  |
FGL [Member] | CF Corporation [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Share Price |  | $ 31.10 | $ 31.10 |  |  |
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% | 3.50% |  | 2.35% | 0.00%

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