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Stock-based Compensation - Summary of Restricted Stock and Restricted Stock Units Outstanding and Related Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
HGI |  |
Shares: |  |
Granted | 343 |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 2,300,000 |
Exercised / Released | $ 30,400,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 3.2 |
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options | $ 6.5 |
HGI | Time Based Restricted Stock Units [Member] |  |
Shares: |  |
Granted | 25 |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 15.71 |
Exercised / Released | $ 400,000 |
HGI | Employee Stock Option |  |
Shares: |  |
Restricted award expected to vest | 3,976 |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 1,900,000 |
Restricted award expected to vest | $ 3.88 |
HGI | Restricted stock awards |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease) |  | 1,975
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease) | 143 |
Shares: |  |
Exercised / Released | (1,857) |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 12.73 |
Restricted award expected to vest | $ 13.36 | $ 12.74
HGI | Restricted Stock Units (RSUs) [Member] |  |
Shares: |  |
Nonvested awards at beginning of period | 42 |
Granted | 0 |
Exercised / Released | (42) |
Forfeited | 0 |
Nonvested awards at end of period |  | 42
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Nonvested awards at beginning of period (in dollars per share) | $ 12.33 |
Granted | 0.00 |
Exercised / Released | 12.33 |
Forfeited | $ 0.00 |
Nonvested awards at end of period (in dollars per share) |  | $ 12.33
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 0 |
Spectrum Brands [Member] |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 39,400,000 |
Exercised / Released | $ 49,100,000 |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 296 |
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member] |  |
Shares: |  |
Granted | 0 |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 0.00 |
Exercised / Released | 0 |
Spectrum Brands [Member] | Performance-based and Time-based Shares |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 122.39 |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 401 |
Spectrum Brands [Member] | Employee Stock Option |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 0 |
Spectrum Brands [Member] | Restricted stock awards |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 133.05 |
Spectrum Brands [Member] | Restricted Stock Units (RSUs) [Member] |  |
Shares: |  |
Nonvested awards at beginning of period | 577 |
Granted | 697 |
Exercised / Released | (501) |
Forfeited | (12) |
Nonvested awards at end of period | 761 | 577
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Nonvested awards at beginning of period (in dollars per share) | $ 94.97 |
Granted | 127.00 |
Exercised / Released | 109.03 |
Forfeited | 118.89 |
Nonvested awards at end of period (in dollars per share) |  | $ 94.97
Restricted award expected to vest | $ 114.67 |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 296 |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 88.5 |
Share-based Compensation Award, Tranche One [Member] | Spectrum Brands [Member] |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 100,000 |
Share-based Compensation Award, Tranche One [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 1 |
Share-based Compensation Award, Tranche One [Member] | Spectrum Brands [Member] | Restricted stock awards |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 137.54 |
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 13,000,000 |
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 106 |
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] | Restricted stock awards |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 122.65 |
Share-based Compensation Award, Tranche Three [Member] | Spectrum Brands [Member] |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Exercised / Released | $ 36,000,000 |
Share-based Compensation Award, Tranche Three [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Stock Issued During Period, Shares, Restricted Stock Award, Gross | 294 |
Share-based Compensation Award, Tranche Three [Member] | Spectrum Brands [Member] | Restricted stock awards |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |
Granted | $ 122.43 |

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- Definition Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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