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Basis of Preparation and Nature of Operations Additional Information (Detail) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Feb. 24, 2018 $ / shares | May 06, 2017 | Nov. 08, 2015 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Number of reporting segments | 2 |  |  |  |  |
Deconsolidation, Gain (Loss), Amount | $ 0.0 | $ 0.0 | $ 38.5 |  |  |
Long-term debt | 5,801.9 | $ 5,575.4 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | $ 100.0 |  |  |  |  |
Document Period End Date | Sep. 30, 2017 |  |  |  |  |
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 | 59.60% |  |  |  |  |
Spectrum Brands [Member] | 6.375% Senior Notes due 2020 | Secured Debt [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt, interest rate | 0.00% | 6.375% |  |  |  |
Debt Instrument, Repurchase Amount | $ 390.3 |  |  |  |  |
Long-term debt | $ 0.0 | $ 129.7 | 520.0 |  |  |
Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 425.0 |  |  |  |
Spectrum Brands [Member] | Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt, interest rate | 4.00% | 4.00% |  |  |  |
Salus Capital Partners LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt | $ 22.2 | $ 30.3 |  |  |  |
Parent Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt | 1,718.3 | $ 1,711.2 |  |  |  |
Total Operating and Capital Loss forward | $ 1,840.2 |  |  |  |  |
Parent Company [Member] | 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 |  |  |  |
Parent Company [Member] | Seven Point Seven Five Percent Senior Unsecured Notes [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long-term debt, interest rate | 7.75% | 7.75% |  |  |  |
Long-term debt |  | $ 890.0 |  |  |  |
FOH [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Impaired Financing Receivable, Recorded Investment |  |  | 16.2 |  |  |
FGL [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Termination Fee Payable for Termination of Merger Agreement | $ 50.0 |  |  |  |  |
Percentage Of Ownership Interest | 80.40% |  |  |  | 50.00% |
CorAmerica [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill and Intangible Asset Impairment |  | 10.7 | $ 28.3 |  |  |
FS Holdco II Ltd. [Domain] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Due to Affiliate | $ 30.0 |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Current | 6.0 |  |  |  |  |
Business Combination, Contingent Consideration, Asset | 6.0 |  |  |  |  |
Business Combination, Assets and Liabilities Arising from Contingencies, Amount Recognized, Net | 9.6 |  |  |  |  |
Petmatrix LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 255.2 |  |  |  |  |
Business Combination, Consideration Transferred | $ 255.2 |  |  |  |  |
Zap Com Corporation [Member] | Zap Com Corporation [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage Of Ownership Interest | 99.50% |  |  |  |  |
GloFish [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 49.7 |  |  |  |  |
Business Combination, Consideration Transferred | 49.7 |  |  |  |  |
Shaser, Inc. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 12.6 |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description | 0.44 |  |  |  |  |
Common Stock | Spectrum Brands [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 575.0 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  | $ 0.01 |  |
FGL [Member] | Anbang Insurance Group Co., Ltd. [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  |  |  |  | $ 26.80
FGL [Member] | CF Corporation [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Share Price | $ / shares | $ 31.10 |  |  |  |  |

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