Guarantor Statements (Statement Of Income) (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Dec. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]
Net sales	$ 906.7			$ 882.6		$ 1,787.0	$ 1,804.9
Cost of goods sold	601.0			574.9		1,174.7	1,178.3
Restructuring and related charges	0.2			1.7		1.0	2.0
Gross profit	305.5			306.0		611.3	624.6
Selling	151.4			152.4		306.9	306.1
General and administrative	83.6			82.6		183.0	162.2
Research and development	11.2			11.5		22.3	23.0
Transaction related charges	5.3			9.6		11.6	14.9
Restructuring and related charges	12.4			18.6		20.5	35.5
Total operating expenses	263.9			274.7		544.3	541.7
Operating (loss) income	41.6			31.3		67.0	82.9
Interest expense	94.2			67.7		151.2	143.0
Other non-operating expense (income), net	24.1					24.8	(0.7)
(Loss) Income from continuing operations before income taxes	(76.7)			(36.4)		(109.0)	(59.4)
Income tax (benefit) expense	(22.7)			(1.7)		(26.0)	(122.2)
Net (loss) income from continuing operations	(54.0)		$ (29.0)	(34.7)	$ 97.2	(83.0)	62.8
Income (Loss) from discontinued operations, net of tax	783.6		(83.2)	11.3	481.6	700.4	492.7
Net income (loss)	729.6			(23.4)		617.4	555.5
Net income attributable to non-controlling interest	1.0			5.5		1.2	77.0
Net income (loss) attributable to controlling interest	728.6			(28.9)		616.2	478.5
Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales		$ 432.3				866.1
Cost of goods sold		329.8				648.7
Gross profit		102.5				217.4
Selling		59.4				120.7
General and administrative		48.6				116.1
Research and development		6.1				11.8
Transaction related charges		7.6				21.1
Restructuring and related charges		9.5				13.6
Total operating expenses		131.2				283.3
Operating (loss) income		(28.7)				(65.9)
Interest expense		55.7				93.1
Other non-operating expense (income), net		(106.6)				(130.5)
(Loss) Income from continuing operations before income taxes		22.2				(28.5)
Income tax (benefit) expense		40.3				9.2
Net (loss) income from continuing operations		(18.1)				(37.7)
Income (Loss) from discontinued operations, net of tax		783.9				700.1
Net income (loss)		765.8				662.4
Net income (loss) attributable to controlling interest		765.8				662.4
SB/RH [Member]
Condensed Income Statements, Captions [Line Items]
Net sales	906.7	906.7				1,787.0
Cost of goods sold	601.0	601.0				1,174.7
Restructuring and related charges	0.2	0.2				1.0
Gross profit	305.5	305.5				611.3
Selling	151.4	151.4				306.9
General and administrative	82.4	82.4				180.6
Research and development	11.2	11.2				22.3
Transaction related charges	5.3	5.3				11.6
Restructuring and related charges	12.4	12.4				20.5
Total operating expenses	262.7	262.7				541.9
Operating (loss) income	42.8	42.8				69.4
Interest expense	48.3	48.3				91.5
Other non-operating expense (income), net	24.2	24.2				25.0
(Loss) Income from continuing operations before income taxes	(29.7)	(29.7)				(47.1)
Income tax (benefit) expense	(17.3)	(17.3)				(15.8)
Net (loss) income from continuing operations	(12.4)	(12.4)	(18.9)	14.9	147.7	(31.3)
Income (Loss) from discontinued operations, net of tax	783.6	783.6	$ (83.2)	11.3	$ 21.7	700.4
Net income (loss)	771.2	771.2				669.1
Net income attributable to non-controlling interest	1.0	1.0				1.2
Net income (loss) attributable to controlling interest	$ 770.2	770.2				667.9
Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales		(370.2)				(742.7)
Cost of goods sold		(367.8)				(740.4)
Gross profit		(2.4)				(2.3)
Selling						(0.1)
General and administrative		(0.5)				(1.0)
Total operating expenses		(0.5)				(1.1)
Operating (loss) income		(1.9)				(1.2)
Interest expense		(0.1)				(0.2)
Other non-operating expense (income), net		1,046.4				1,101.7
(Loss) Income from continuing operations before income taxes		(1,048.2)				(1,102.7)
Income tax (benefit) expense		(0.4)				(0.9)
Net (loss) income from continuing operations		(1,047.8)				(1,101.8)
Income (Loss) from discontinued operations, net of tax		7.4				90.1
Net income (loss)		(1,040.4)				(1,011.7)
Net income (loss) attributable to controlling interest		(1,040.4)				(1,011.7)
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales		385.7				672.9
Cost of goods sold		286.0				505.3
Gross profit		99.7				167.6
Selling		33.1				60.5
General and administrative		22.5				41.6
Research and development		2.4				4.8
Transaction related charges		(1.3)				(0.6)
Restructuring and related charges		0.3				1.0
Total operating expenses		57.0				107.3
Operating (loss) income		42.7				60.3
Interest expense		1.2				6.1
Other non-operating expense (income), net		(399.1)				(430.4)
(Loss) Income from continuing operations before income taxes		440.6				484.6
Income tax (benefit) expense		(59.6)				(38.9)
Net (loss) income from continuing operations		500.2				523.5
Income (Loss) from discontinued operations, net of tax		(5.0)				(82.3)
Net income (loss)		495.2				441.2
Net income (loss) attributable to controlling interest		495.2				441.2
Nonguarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales		458.9				990.7
Cost of goods sold		353.0				761.1
Restructuring and related charges		0.2				1.0
Gross profit		105.7				228.6
Selling		58.9				125.8
General and administrative		11.8				23.9
Research and development		2.7				5.7
Transaction related charges		(1.0)				(8.9)
Restructuring and related charges		2.6				5.9
Total operating expenses		75.0				152.4
Operating (loss) income		30.7				76.2
Interest expense		(8.5)				(7.5)
Other non-operating expense (income), net		(516.5)				(515.8)
(Loss) Income from continuing operations before income taxes		555.7				599.5
Income tax (benefit) expense		2.4				14.8
Net (loss) income from continuing operations		553.3				584.7
Income (Loss) from discontinued operations, net of tax		(2.7)				(7.5)
Net income (loss)		550.6				577.2
Net income attributable to non-controlling interest		1.0				1.2
Net income (loss) attributable to controlling interest		$ 549.6				$ 576.0
Three Month Periods Ended April 1, 2018 [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales				401.0
Cost of goods sold				290.4
Gross profit				110.6
Selling				60.0
General and administrative				19.5
Research and development				6.1
Transaction related charges				7.0
Restructuring and related charges				16.0
Total operating expenses				108.6
Operating (loss) income				2.0
Interest expense				36.6
Other non-operating expense (income), net				(151.6)
(Loss) Income from continuing operations before income taxes				117.0
Income tax (benefit) expense				100.7
Net (loss) income from continuing operations				16.3
Income (Loss) from discontinued operations, net of tax				11.2
Net income (loss)				27.5
Net income (loss) attributable to controlling interest				27.5
Three Month Periods Ended April 1, 2018 [Member] | SB/RH [Member]
Condensed Income Statements, Captions [Line Items]
Net sales				882.6
Cost of goods sold				574.9
Restructuring and related charges				1.7
Gross profit				306.0
Selling				152.4
General and administrative				56.2
Research and development				11.5
Transaction related charges				9.6
Restructuring and related charges				18.6
Total operating expenses				248.3
Operating (loss) income				57.7
Interest expense				42.0
Other non-operating expense (income), net				1.6
(Loss) Income from continuing operations before income taxes				14.1
Income tax (benefit) expense				(0.8)
Net (loss) income from continuing operations				14.9
Income (Loss) from discontinued operations, net of tax				11.3
Net income (loss)				26.2
Net income attributable to non-controlling interest				0.1
Net income (loss) attributable to controlling interest				26.1
Three Month Periods Ended April 1, 2018 [Member] | Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales				(330.1)
Cost of goods sold				(328.2)
Gross profit				(1.9)
Operating (loss) income				(1.9)
Interest expense				(0.1)
Other non-operating expense (income), net				176.5
(Loss) Income from continuing operations before income taxes				(178.3)
Income tax (benefit) expense				(0.4)
Net (loss) income from continuing operations				(177.9)
Income (Loss) from discontinued operations, net of tax				(43.4)
Net income (loss)				(221.3)
Net income (loss) attributable to controlling interest				(221.3)
Three Month Periods Ended April 1, 2018 [Member] | Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales				352.0
Cost of goods sold				260.3
Restructuring and related charges				0.1
Gross profit				91.6
Selling				31.3
General and administrative				21.7
Research and development				2.1
Transaction related charges				1.5
Restructuring and related charges				1.0
Total operating expenses				57.6
Operating (loss) income				34.0
Interest expense				4.8
Other non-operating expense (income), net				(23.2)
(Loss) Income from continuing operations before income taxes				52.4
Income tax (benefit) expense				(97.8)
Net (loss) income from continuing operations				150.2
Income (Loss) from discontinued operations, net of tax				27.0
Net income (loss)				177.2
Net income (loss) attributable to controlling interest				177.2
Three Month Periods Ended April 1, 2018 [Member] | Nonguarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales				459.7
Cost of goods sold				352.4
Restructuring and related charges				1.6
Gross profit				105.7
Selling				61.1
General and administrative				15.0
Research and development				3.3
Transaction related charges				1.1
Restructuring and related charges				1.6
Total operating expenses				82.1
Operating (loss) income				23.6
Interest expense				0.7
Other non-operating expense (income), net				(0.1)
(Loss) Income from continuing operations before income taxes				23.0
Income tax (benefit) expense				(3.3)
Net (loss) income from continuing operations				26.3
Income (Loss) from discontinued operations, net of tax				16.5
Net income (loss)				42.8
Net income attributable to non-controlling interest				0.1
Net income (loss) attributable to controlling interest				$ 42.7
Six Month Periods Ended April 1, 2018 [Member] | Parent [Member]
Condensed Income Statements, Captions [Line Items]
Net sales							865.8
Cost of goods sold							639.7
Gross profit							226.1
Selling							121.4
General and administrative							52.2
Research and development							11.9
Transaction related charges							9.8
Restructuring and related charges							32.0
Total operating expenses							227.3
Operating (loss) income							(1.2)
Interest expense							70.2
Other non-operating expense (income), net							(238.5)
(Loss) Income from continuing operations before income taxes							167.1
Income tax (benefit) expense							3.2
Net (loss) income from continuing operations							163.9
Income (Loss) from discontinued operations, net of tax							29.7
Net income (loss)							193.6
Net income (loss) attributable to controlling interest							193.6
Six Month Periods Ended April 1, 2018 [Member] | SB/RH [Member]
Condensed Income Statements, Captions [Line Items]
Net sales							1,804.9
Cost of goods sold							1,178.3
Restructuring and related charges							2.0
Gross profit							624.6
Selling							306.1
General and administrative							125.1
Research and development							23.0
Transaction related charges							14.9
Restructuring and related charges							35.5
Total operating expenses							504.6
Operating (loss) income							120.0
Interest expense							80.5
Other non-operating expense (income), net							3.2
(Loss) Income from continuing operations before income taxes							36.3
Income tax (benefit) expense							(126.5)
Net (loss) income from continuing operations							162.8
Income (Loss) from discontinued operations, net of tax							32.8
Net income (loss)							195.6
Net income attributable to non-controlling interest							1.0
Net income (loss) attributable to controlling interest							194.6
Six Month Periods Ended April 1, 2018 [Member] | Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Net sales							(637.7)
Cost of goods sold							(635.2)
Gross profit							(2.5)
Selling							(0.2)
Total operating expenses							(0.2)
Operating (loss) income							(2.3)
Interest expense							(0.1)
Other non-operating expense (income), net							307.1
(Loss) Income from continuing operations before income taxes							(309.3)
Income tax (benefit) expense							(1.0)
Net (loss) income from continuing operations							(308.3)
Income (Loss) from discontinued operations, net of tax							(76.1)
Net income (loss)							(384.4)
Net income (loss) attributable to controlling interest							(384.4)
Six Month Periods Ended April 1, 2018 [Member] | Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales							570.8
Cost of goods sold							415.1
Restructuring and related charges							0.1
Gross profit							155.6
Selling							58.0
General and administrative							42.3
Research and development							4.3
Transaction related charges							2.8
Restructuring and related charges							1.0
Total operating expenses							108.4
Operating (loss) income							47.2
Interest expense							9.2
Other non-operating expense (income), net							(65.3)
(Loss) Income from continuing operations before income taxes							103.3
Income tax (benefit) expense							(134.0)
Net (loss) income from continuing operations							237.3
Income (Loss) from discontinued operations, net of tax							46.6
Net income (loss)							283.9
Net income (loss) attributable to controlling interest							283.9
Six Month Periods Ended April 1, 2018 [Member] | Nonguarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Net sales							1,006.0
Cost of goods sold							758.7
Restructuring and related charges							1.9
Gross profit							245.4
Selling							126.9
General and administrative							30.6
Research and development							6.8
Transaction related charges							2.3
Restructuring and related charges							2.5
Total operating expenses							169.1
Operating (loss) income							76.3
Interest expense							1.2
Other non-operating expense (income), net							(0.1)
(Loss) Income from continuing operations before income taxes							75.2
Income tax (benefit) expense							5.3
Net (loss) income from continuing operations							69.9
Income (Loss) from discontinued operations, net of tax							32.6
Net income (loss)							102.5
Net income attributable to non-controlling interest							1.0
Net income (loss) attributable to controlling interest							$ 101.5