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Stock-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Dec. 31, 2017
Stock-based compensation	$ 4.2	$ 9.5
HGI
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity intruments other than options granted	24
Granted	$ 400,000
Exercised / Released	$ 2,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 0.5
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	1.4
Compensation cost not yet recognized	$ 1.0
Unrecognized compensation cost expected to recognized, years	1 year 2 months 6 days
HGI | Stock option awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual term of outstanding stock option awards	4 years 21 days
HGI | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, granted	0
Granted	$ 0.00
Exercised / Released	$ 0
HGI | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	143
Exercised / Released	$ 13.36
HGI | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value	$ 0
Equity intruments other than options granted	0
Granted	$ 0.00
Exercised / Released	$ 0.00
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0
HGI | Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity intruments other than options granted	24
Granted	$ 16.85
Exercised / Released	400,000
HGI | Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	3.22
Granted	13.13
Spectrum Brands [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	10,400,000
Exercised / Released	$ 25,600,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	92
Spectrum Brands [Member] | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, granted	0
Granted	$ 0.00
Exercised / Released	0
Spectrum Brands [Member] | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 113.29
Spectrum Brands [Member] | Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	456
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value	$ 10,400,000
Equity intruments other than options granted	324
Granted	$ 111.06
Exercised / Released	$ 113.24
Compensation cost not yet recognized	$ 43.4
Stock Issued During Period, Shares, Restricted Stock Award, Gross	92
Equity instruments other than options, grant date fair value	$ 36.0
Spectrum Brands [Member] | Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity intruments other than options granted	0
Granted	$ 0.00
Exercised / Released	0
Spectrum Brands [Member] | Performance-based and Time-based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 110.17
Stock Issued During Period, Shares, Restricted Stock Award, Gross	232
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised / Released	$ 12,800,000
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] | Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	$ 110.17
Share-based Compensation Award, Tranche Two [Member] | Spectrum Brands [Member] | Performance-based and Time-based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	116

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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.

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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.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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