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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Commitment And Contingencies [Line Items] |  |  |
Document Period End Date | Sep. 30, 2017 |  |
Commitments and contingencies (Note 21) |  |  |
Inventory Recall Expense | 15.0 | 0.0 | $ 0.0
Product Liability Accrual, Period Expense | 5.3 |  |
Long-term debt | 5,801.9 | 5,575.4 |
Spectrum Brands [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Environmental costs recognized, capitalized | 4.4 |  |
Product Liability Accrual, Period Expense | 35.8 |  |
Dale R. Ludwick, on behalf of Herself and All Others Similarly Situated v. Harbinger Group Inc., Fidelity & Guaranty Life Insurance Company, Raven Reinsurance Company, and Front Street Re (Cayman) Ltd [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Estimated Litigation Liability | 1.8 |  |
Spectrum Brands [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Product Liability Accrual, Component Amount | 5.8 | 5.6 |
Product Warranty Accrual, Current | 6.4 | 7.0 |
Inventory Recall Expense | 7.1 |  |
Incremental Costs To Dispose Of Product And Operational Expenses | 13.7 |  |
Salus Capital Partners LLC |  |  |
Commitment And Contingencies [Line Items] |  |  |
Long-term debt | 22.2 | 30.3 |
FGL [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Commitments Partially Amount Of Notional Amount Of Unfunded Legally Binding Lending | 196.6 |  |
Accrued amount of guaranty fund assessments | 2.1 |  |
Estimated future premium tax deductions | $ 2.0 |  |
FGL [Member] | Cressy Plaintiff [Member] |  |  |
Commitment And Contingencies [Line Items] |  |  |
Litigation Settlement, Amount |  | $ 1.3 |

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),19) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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