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Derivative Financial Instruments - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) ozt T | Sep. 30, 2015 USD ($) ozt T | Sep. 30, 2014 USD ($) | Sep. 30, 2012 USD ($)
Derivative Financial Instruments [Line Items] |  |  |  |  |
Long-term debt |  | $ 5,540,700,000 | $ 6,112,100,000 |  |
Spectrum Brands [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | 1,100,000 | 27,500,000 | $ (2,600,000) |
Cash Collateral for Borrowed Securities |  |  | 3,500,000 |  |
Spectrum Brands [Member] | Standby Letters of Credit |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | $ 0 | $ 0
Spectrum Brands [Member] | Interest Rate Contract [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | $ 400,000 |  |  |
Derivative, Fixed Interest Rate |  | 0.00% |  |  |
Derivative, Notional Amount |  | $ 300,000,000 | $ 300,000,000 |  |
Derivative, Remaining Maturity |  | 6 months | 1 year 6 months |  |
Spectrum Brands [Member] | Foreign exchange contracts |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Accumulated Other Comprehensive Income Loss Cumulative Gain Loss From Derivative Instrument Before Tax |  | $ 1,900,000 |  |  |
Contract value |  | 224,800,000 | $ 300,600,000 |  |
Spectrum Brands [Member] | Foreign exchange forward agreements |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Contract value |  | 131,400,000 | $ 126,800,000 |  |
Spectrum Brands [Member] | ERROR in label resolution. |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | $ 1,100,000 |  |  |
Weight Of Raw Material Under Derivative Contract | T |  | 6.7 | 10.8 |  |
Contract value |  | $ 12,800,000 | $ 22,200,000 |  |
Spectrum Brands [Member] | ERROR in label resolution. |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount | ozt |  | 31 | 25 |  |
Contract value |  | $ 600,000 | $ 400,000 |  |
Spectrum Brands [Member] | Bronze Commodity Contract [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Weight Of Raw Material Under Derivative Contract | T |  | 1.0 | 1.8 |  |
Contract value |  | $ 4,000,000 | $ 8,500,000 |  |
Other Liabilities [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax |  | 11,000,000 |  |  |
Derivatives not designated as hedging instrument |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 25,900,000 | 12,400,000 |  |
Derivatives not designated as hedging instrument | Other assets | Call options |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 5,900,000 | 1,000,000 |  |
Other (expense) income, net | Currency Swap [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments |  | $ 2,400,000 | $ (11,000,000) |  |
Subsequent Event [Member] | Spectrum Brands [Member] |  |  |  |  |
Derivative Financial Instruments [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 5,900,000 |  |  |  |

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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)(16)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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