Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income (loss)	$ 617.4	$ 555.5
Income (Loss) from discontinued operations, net of tax	700.4	492.7
Net (loss) income from continuing operations	(83.0)	62.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	102.6	68.6
Share based compensation	21.8	1.4
Unrealized loss on investments	5.0
Purchase accounting inventory adjustment		0.8
Pet safety recall inventory write-off		1.6
Amortization of debt issuance costs and debt discount	6.6	11.7
Write-off of unamortized discount and debt issuance costs	36.6
Dividend from subsidiaries classified as discontinued operations		3.1
Deferred tax benefit	(61.8)	(55.4)
Net changes in operating assets and liabilities	(307.5)	(351.9)
Net cash used by operating activities from continuing operations	(279.7)	(257.3)
Net cash (used) provided by operating activities from discontinued operations	(254.0)	71.5
Net cash used by operating activities	(533.7)	(185.8)
Cash flows from investing activities
Purchases of property, plant and equipment	(27.1)	(38.1)
Proceeds from sales of property, plant and equipment	0.1	0.9
Proceeds from sale of discontinued operations, net of cash	2,854.4	1,520.2
Net cash provided (used) by investing activities from continuing operations	2,827.4	1,483.0
Net cash used by investing activities from discontinued operations	(5.3)	(185.1)
Net cash provided (used) by investing activities	2,822.1	1,297.9
Cash flows from financing activities
Proceeds from issuance of debt	136.3	581.3
Payment of debt, including premium on extinguishment	(2,479.9)	(998.0)
Payment of debt issuance costs	(0.1)	(0.3)
Treasury stock purchases	(268.5)
Purchase of subsidiary stock, net		(258.0)
Dividends paid to shareholders	(44.6)
Dividend paid by subsidiary to non-controlling interest		(19.7)
Share based award tax withholding payments, net of proceeds upon vesting	(2.5)	(22.7)
Other financing activities, net		10.0
Net cash (used) provided by financing activities from continuing operations	(2,659.3)	(707.4)
Net cash (used) provided by financing activities from discontinued operations	(2.3)	118.5
Net cash (used) provided by financing activities	(2,661.6)	(588.9)
Effect of exchange rate changes on cash, restricted cash and cash equivalents	(3.1)	3.2
Net change in cash, cash equivalents and restricted cash	(376.3)	526.4
Net change in cash, cash equivalents and restricted cash in discontinued operations		37.7
Net change in cash, cash equivalents and restricted cash in continuing operations	(376.3)	488.7
Cash, cash equivalents and restricted cash, beginning of period	561.4	254.8
Cash, cash equivalents and restricted cash, end of period	185.1	743.5
Supplemental disclsoure of cash flow information
Cash paid for interest	140.9	172.2
Cash paid for taxes	36.3	24.8
Non cash investing activities
Acquisition of property, plant and equipment through capital leases	1.6	3.0
Non cash financing activities
Issuance of shares through stock conpensation plan	23.3
SB/RH [Member]
Cash flows from operating activities
Net income (loss)	669.1
Income (Loss) from discontinued operations, net of tax	700.4
Net (loss) income from continuing operations	(31.3)
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	102.6
Share based compensation	21.1
Unrealized loss on investments	5.0
Amortization of debt issuance costs and debt discount	3.7
Write-off of unamortized discount and debt issuance costs	12.7
Deferred tax benefit	(51.6)
Net changes in operating assets and liabilities	(329.5)
Net cash used by operating activities from continuing operations	(267.3)
Net cash (used) provided by operating activities from discontinued operations	(254.0)
Net cash used by operating activities	(521.3)
Cash flows from investing activities
Purchases of property, plant and equipment	(27.1)
Proceeds from sales of property, plant and equipment	0.1
Proceeds from sale of discontinued operations, net of cash	2,854.4
Net cash provided (used) by investing activities from continuing operations	2,827.4
Net cash used by investing activities from discontinued operations	(5.3)
Net cash provided (used) by investing activities	2,822.1
Cash flows from financing activities
Proceeds from issuance of debt	136.3
Payment of debt, including premium on extinguishment	(2,092.6)
Payment of debt issuance costs	(0.1)
Payment of cash dividends to parent	(676.4)
Net cash (used) provided by financing activities from continuing operations	(2,632.8)
Net cash (used) provided by financing activities from discontinued operations	(2.3)
Net cash (used) provided by financing activities	(2,635.1)
Effect of exchange rate changes on cash, restricted cash and cash equivalents	(3.1)
Net change in cash, cash equivalents and restricted cash	(337.4)
Cash, cash equivalents and restricted cash, beginning of period	514.3
Cash, cash equivalents and restricted cash, end of period	176.9
Supplemental disclsoure of cash flow information
Cash paid for interest	109.8
Cash paid for taxes	36.3
Non cash investing activities
Acquisition of property, plant and equipment through capital leases	$ 1.6
Six Month Periods Ended April 1, 2018 [Member] | SB/RH [Member]
Cash flows from operating activities
Net income (loss)		195.6
Income (Loss) from discontinued operations, net of tax		32.8
Net (loss) income from continuing operations		162.8
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization		68.6
Share based compensation		(0.3)
Purchase accounting inventory adjustment		0.8
Pet safety recall inventory write-off		1.6
Amortization of debt issuance costs and debt discount		4.6
Deferred tax benefit		(59.8)
Net changes in operating assets and liabilities		(385.4)
Net cash used by operating activities from continuing operations		(207.1)
Net cash (used) provided by operating activities from discontinued operations		(25.9)
Net cash used by operating activities		(233.0)
Cash flows from investing activities
Purchases of property, plant and equipment		(38.1)
Proceeds from sales of property, plant and equipment		0.8
Net cash provided (used) by investing activities from continuing operations		(37.3)
Net cash used by investing activities from discontinued operations		(10.2)
Net cash provided (used) by investing activities		(47.5)
Cash flows from financing activities
Proceeds from issuance of debt		581.3
Payment of debt, including premium on extinguishment		(41.4)
Payment of debt issuance costs		(0.3)
Payment of cash dividends to parent		(298.6)
Net cash (used) provided by financing activities from continuing operations		241.0
Net cash (used) provided by financing activities from discontinued operations		3.3
Net cash (used) provided by financing activities		244.3
Effect of exchange rate changes on cash, restricted cash and cash equivalents		3.2
Net change in cash, cash equivalents and restricted cash		(33.0)
Cash, cash equivalents and restricted cash, beginning of period		183.5
Cash, cash equivalents and restricted cash, end of period		150.5
Supplemental disclsoure of cash flow information
Cash paid for interest		103.9
Cash paid for taxes		24.8
Non cash investing activities
Acquisition of property, plant and equipment through capital leases		$ 3.0