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Related Party Transactions Addtional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Related Party Transaction [Line Items] |  |  |  |
Common stock, shares, issued |  |  | 200,789,100 | 201,383,800
Document Period End Date | Mar. 31, 2018 |  |  |
Long-term debt | $ 5,404.2 | $ 5,801.9 |  |
Jefferies [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Investment Advisory, Management and Administrative Fees | 3.0 |  |  |
Fees and Commissions | $ 1.0 |  |  |
Five Point Seven Five Percent Senior Notes Due July 15 2025 [Member] | Spectrum Brands [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Long-term debt, interest rate | 5.80% | 5.80% |  |
Long-term debt | $ 1,000.0 | $ 1,000.0 |  |
7.875% Senior Secured Notes, due July 15, 2019 | Secured Debt [Member] | HGI |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Long-term debt, interest rate | 0.00% | 7.875% |  |
Four Point Zero Percent Senior Notes [Member] | Secured Debt [Member] | Spectrum Brands [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Long-term debt, interest rate | 4.00% |  |  |
Seven Point Seven Five Percent Senior Unsecured Notes [Member] | HGI |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Long-term debt, interest rate | 7.75% | 7.75% |  |
Long-term debt |  | $ 890.0 |  |

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