Derivative Financial Instruments - Pretax Impact of Derivative Instruments Designated as Cash Flow Hedges on the Accompanying Condensed Consolidated Statements of Operations, and Within AOCI (Detail) - USD ($)
$ in Millions

3 Months Ended

6 Months Ended

12 Months Ended

Mar. 31, 2018

Mar. 31, 2017

Mar. 31, 2018

Mar. 31, 2017

Sep. 30, 2017

Derivative Instruments, Gain (Loss) [Line Items]

Document Period End Date

Mar. 31, 2018

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

$ (2.8)

Impact of effective and ineffective portions of cash flow hedges and gain (loss) realized in statement of operations [Table Text Block]

The following tables summarize the impact of the effective portion of Spectrum Brands’ derivative instruments in the accompanying Condensed Consolidated Statements of Operations for the three and six months ended March 31, 2018 and 2017, pre-tax:

Three months ended March 31, 2018	Classification	Effective Portion									Ineffective Portion
		Gain (Loss) in AOCI			Gain (Loss) reclassified to Continuing Operations			Reclassified to Discontinued Operations			Discontinued Operations
Interest rate swaps	Interest expense	$	1.8		$	—		$	0.7		$	0.6
Commodity swaps	Cost of goods sold	(0.6		)	0.3			1.3			—
Net investment hedge	Other income (expense), net	(15.2		)	—			—			—
Foreign exchange contracts	Cost of goods sold	(4.4		)	(0.5		)	(4.8		)	—
		$	(18.4	)	$	(0.2	)	$	(2.8	)	$	0.6

Three months ended March 31, 2017	Classification	Effective Portion									Ineffective Portion
		Gain (Loss) in AOCI			Gain (Loss) reclassified to Continuing Operations			Reclassified to Discontinued Operations			Discontinued Operations
Interest rate swaps	Interest expense	$	(0.4	)	$	—		$	(0.7	)	$	—
Commodity swaps	Cost of goods sold	3.7			0.3			1.4			—
Net investment hedge	Other income (expense), net	(9.2		)	—			—			—
Foreign exchange contracts	Net sales	(0.1		)	—			—			—
Foreign exchange contracts	Cost of goods sold	(4.4		)	(0.1		)	2.9			—
		$	(10.4	)	$	0.2		$	3.6		$	—

Six months ended March 31, 2018	Classification	Effective Portion									Ineffective Portion
		Gain (Loss) in AOCI			Gain (Loss) reclassified to Continuing Operations			Reclassified to Discontinued Operations			Discontinued Operations
Interest rate swaps	Interest expense	$	3.8		$	—		$	0.3		$	0.6
Commodity swaps	Cost of goods sold	1.2			0.6			2.5			—
Net investment hedge	Other income (expense), net	(21.8		)	—			—			—
Foreign exchange contracts	Net sales	—			0.1			—			—
Foreign exchange contracts	Cost of goods sold	(2.4		)	(0.3		)	(8.9		)	—
		$	(19.2	)	$	0.4		$	(6.1	)	$	0.6

Six months ended March 31, 2017	Classification	Effective Portion								Ineffective Portion
		Gain (Loss) in AOCI			Gain (Loss) reclassified to Continuing Operations		Reclassified to Discontinued Operations			Discontinued Operations
Interest rate swaps	Interest expense	$	(0.3	)	$	—	$	(1.0	)	$	—
Commodity swaps	Cost of goods sold	3.8			0.3		2.2			—
Net investment hedge	Other income (expense), net	23.3			—		—			—
Foreign exchange contracts	Net sales	0.1			—		—			—
Foreign exchange contracts	Cost of goods sold	5.9			—		7.1			—
		$	32.8		$	0.3	$	8.3		$	—

Spectrum Brands [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(18.4)

$ (10.4)

$ (19.2)

$ 32.8

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.6

0.0

0.6

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

(0.2)

0.2

0.4

0.3

Spectrum Brands [Member] | Zinc Commodity Swap Contract [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0.1

Spectrum Brands [Member] | Interest Rate Contract [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative, Notional Amount

300.0

$ 300.0

$ 300.0

Derivative, Remaining Maturity

2 years 1 month

2 years 7 months

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

$ 0.6

Spectrum Brands [Member] | Foreign exchange contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Contracts Market Value

63.3

63.3

$ 67.5

Spectrum Brands [Member] | Bronze Commodity Contract [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Contracts Market Value

5.5

5.5

$ 6.6

Spectrum Brands [Member] | Sales Revenue, Net [Member] | Foreign exchange contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(0.1)

0.0

0.1

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.0

0.0

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0.0

0.1

0.0

Spectrum Brands [Member] | Consumer products cost of goods sold classification | Commodity contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(0.6)

3.7

1.2

3.8

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.0

0.0

0.0

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0.3

0.3

0.6

0.3

Spectrum Brands [Member] | Consumer products cost of goods sold classification | Foreign exchange contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(4.4)

(4.4)

(2.4)

5.9

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.0

0.0

0.0

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

(0.5)

(0.1)

(0.3)

0.0

Spectrum Brands [Member] | Discontinued Operations [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

3.6

(6.1)

8.3

Spectrum Brands [Member] | Discontinued Operations [Member] | Interest Rate Swap [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

0.7

(0.7)

0.3

(1.0)

Spectrum Brands [Member] | Discontinued Operations [Member] | Commodity contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

1.3

1.4

2.5

2.2

Spectrum Brands [Member] | Discontinued Operations [Member] | Net Investment Hedging [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

0.0

0.0

0.0

0.0

Spectrum Brands [Member] | Discontinued Operations [Member] | Foreign exchange contracts

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(4.8)

2.9

(8.9)

7.1

Spectrum Brands [Member] | Other (expense) income, net | Net Investment Hedging [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

(15.2)

(9.2)

(21.8)

23.3

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.0

0.0

0.0

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

0.0

0.0

0.0

0.0

Spectrum Brands [Member] | Interest Expense [Member] | Interest Rate Swap [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net

1.8

(0.4)

3.8

(0.3)

Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net

0.6

0.0

0.6

0.0

Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net

$ 0.0

$ 0.0

$ 0.0

$ 0.0