FINANCIAL INFORMATION FOR SUBSIDIARY GUARANTORS AND NON-GUARANTORS - Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Dec. 15, 2016	Dec. 15, 2015	Oct. 13, 2015
Condensed Cash Flow Statements, Captions [Line Items]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$ 354.0	$ 237.4	$ 246.9
INVESTING ACTIVITIES
Proceeds from sale of long-lived assets	5.7	2.4	5.5
Proceeds from sale of business, net of cash disposed of	180.3		0.0
Investments in property, plant and equipment	(69.6)	(58.3)	(61.7)
Investments in loans receivable	(29.7)	(90.0)	0.0
Net distributions from (investments in) unconsolidated affiliates	57.4	194.1
Cash contributed to TruGreen Joint Venture	0.0	(24.2)	0.0
Investments in acquired businesses, net of cash acquired	(121.7)	(158.4)	(180.2)
Return of investments from affiliates	0.0	0.0
Investment in marketing and license agreement	0.0	0.0	(300.0)
Investing cash flows from (to) affiliates	0.0	0.0	0.0
Net cash (used in) provided by investing activities	22.4	(134.4)	(536.4)
FINANCING ACTIVITIES
Borrowings under revolving and bank lines of credit and term loans	1,449.3	2,069.1	1,836.0
Repayments under revolving and bank lines of credit and term loans	(1,618.3)	(2,150.4)	(1,458.0)
Proceeds from issuance of Senior Notes	250.0	400.0
Repayment of 6.625% Senior Notes	0.0	(200.0)	0.0
Financing and issuance fees	(4.4)	(11.2)	(0.5)
Dividends paid	(120.3)	(116.6)	(111.3)
Distribution paid by AeroGrow to noncontrolling interest	(8.1)	0.0	0.0
Purchase of Common Shares	(246.0)	(130.8)	(14.8)
Payments on sellers notes	(28.7)	(2.8)	(1.5)
Excess tax benefits from share-based payment arrangements	7.9	5.8	4.7
Cash received from exercise of stock options	11.0	14.7	24.3
Financing cash flows from (to) affiliates	0.0	0.0	0.0
Net cash (used in) provided by financing activities	(307.6)	(122.2)	278.9
Effect of exchange rate changes on cash	1.6	(2.1)	(7.3)
Net increase (decrease) in cash and cash equivalents	70.4	(21.3)	(17.9)
Cash and cash equivalents at beginning of year excluding cash classified within assets held for sale	28.6	50.8	64.9
Cash and cash equivalents at beginning of year classified within assets held for sale	21.5	20.6	24.4
Cash and cash equivalents at beginning of year	50.1	71.4	89.3
Cash and cash equivalents at end of year	120.5	50.1	71.4
Subsidiary Guarantors
FINANCING ACTIVITIES
Return of investments from affiliates, included in operating activities		1.5	25.8
Reportable Legal Entities | Parent
Condensed Cash Flow Statements, Captions [Line Items]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(48.3)	18.0	239.4
INVESTING ACTIVITIES
Proceeds from sale of long-lived assets	0.0	0.0	0.0
Proceeds from sale of business, net of cash disposed of	0.0		0.0
Investments in property, plant and equipment	0.0	0.0	0.0
Investments in loans receivable	0.0	0.0
Net distributions from (investments in) unconsolidated affiliates	0.0	0.0
Cash contributed to TruGreen Joint Venture		0.0
Investments in acquired businesses, net of cash acquired	0.0	0.0	0.0
Return of investments from affiliates	909.4	934.3
Investment in marketing and license agreement			0.0
Investing cash flows from (to) affiliates	(759.9)	(914.2)	(141.9)
Net cash (used in) provided by investing activities	149.5	20.1	(141.9)
FINANCING ACTIVITIES
Borrowings under revolving and bank lines of credit and term loans	0.0	0.0	0.0
Repayments under revolving and bank lines of credit and term loans	0.0	0.0	0.0
Proceeds from issuance of Senior Notes	250.0	400.0
Repayment of 6.625% Senior Notes		(200.0)
Financing and issuance fees	(3.8)	(11.2)	(0.4)
Dividends paid	(120.3)	(116.6)	(111.3)
Distribution paid by AeroGrow to noncontrolling interest	0.0
Purchase of Common Shares	(246.0)	(130.8)	(14.8)
Payments on sellers notes	0.0	0.0	0.0
Excess tax benefits from share-based payment arrangements	7.9	5.8	4.7
Cash received from exercise of stock options	11.0	14.7	24.3
Financing cash flows from (to) affiliates	0.0	0.0	0.0
Net cash (used in) provided by financing activities	(101.2)	(38.1)	(97.5)
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents at beginning of year excluding cash classified within assets held for sale	0.0	0.0	0.0
Cash and cash equivalents at beginning of year classified within assets held for sale	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0
Return of investments from affiliates, included in operating activities	(909.4)	934.4	255.5
Proceeds from Investment, Distribution, Return on Investment	28.8
Reportable Legal Entities | Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	462.2	212.8	249.3
INVESTING ACTIVITIES
Proceeds from sale of long-lived assets	5.6	2.4	5.5
Proceeds from sale of business, net of cash disposed of	178.6		0.0
Investments in property, plant and equipment	(59.5)	(49.0)	(56.6)
Investments in loans receivable	(29.7)	(90.0)
Net distributions from (investments in) unconsolidated affiliates	87.1	194.1
Cash contributed to TruGreen Joint Venture		(24.2)
Investments in acquired businesses, net of cash acquired	(112.5)	0.0	(170.8)
Return of investments from affiliates	32.4	0.0
Investment in marketing and license agreement			(300.0)
Investing cash flows from (to) affiliates	(208.6)	(29.1)	0.0
Net cash (used in) provided by investing activities	(106.6)	4.2	(521.9)
FINANCING ACTIVITIES
Borrowings under revolving and bank lines of credit and term loans	1,196.1	1,819.5	1,568.1
Repayments under revolving and bank lines of credit and term loans	(1,319.6)	(1,937.7)	(1,284.1)
Proceeds from issuance of Senior Notes	0.0	0.0
Repayment of 6.625% Senior Notes		0.0
Financing and issuance fees	(0.6)	0.0	(0.1)
Dividends paid	(909.4)	(909.4)	(255.5)
Distribution paid by AeroGrow to noncontrolling interest	0.0
Purchase of Common Shares	0.0	0.0	0.0
Payments on sellers notes	(15.5)	(2.3)	(1.5)
Excess tax benefits from share-based payment arrangements	0.0	0.0	0.0
Cash received from exercise of stock options	0.0	0.0	0.0
Financing cash flows from (to) affiliates	730.5	808.2	230.0
Net cash (used in) provided by financing activities	(318.5)	(221.7)	256.9
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	37.1	(4.7)	(15.7)
Cash and cash equivalents at beginning of year excluding cash classified within assets held for sale	2.7	7.4	23.1
Cash and cash equivalents at beginning of year classified within assets held for sale	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	2.7	7.4	23.1
Cash and cash equivalents at end of year	39.8	2.7	7.4
Return of investments from affiliates, included in operating activities	15.0
Reportable Legal Entities | Non- Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(16.1)	10.2	39.5
INVESTING ACTIVITIES
Proceeds from sale of long-lived assets	0.1	0.0	0.0
Proceeds from sale of business, net of cash disposed of	1.7		0.0
Investments in property, plant and equipment	(10.1)	(9.3)	(5.1)
Investments in loans receivable	0.0	0.0
Net distributions from (investments in) unconsolidated affiliates	(29.7)	0.0
Cash contributed to TruGreen Joint Venture		0.0
Investments in acquired businesses, net of cash acquired	(9.2)	(158.4)	(9.4)
Return of investments from affiliates	0.0	0.0
Investment in marketing and license agreement			0.0
Investing cash flows from (to) affiliates	0.0	0.0	0.0
Net cash (used in) provided by investing activities	(47.2)	(167.7)	(14.5)
FINANCING ACTIVITIES
Borrowings under revolving and bank lines of credit and term loans	253.2	249.6	267.9
Repayments under revolving and bank lines of credit and term loans	(298.7)	(212.7)	(173.9)
Proceeds from issuance of Senior Notes	0.0	0.0
Repayment of 6.625% Senior Notes		0.0
Financing and issuance fees	0.0	0.0	0.0
Dividends paid	(43.8)	(26.5)	(25.8)
Distribution paid by AeroGrow to noncontrolling interest	(40.5)
Purchase of Common Shares	0.0	0.0	0.0
Payments on sellers notes	(13.2)	(0.5)	0.0
Excess tax benefits from share-based payment arrangements	0.0	0.0	0.0
Cash received from exercise of stock options	0.0	0.0	0.0
Financing cash flows from (to) affiliates	238.0	133.1	(88.1)
Net cash (used in) provided by financing activities	95.0	143.0	(19.9)
Effect of exchange rate changes on cash	1.6	(2.1)	(7.3)
Net increase (decrease) in cash and cash equivalents	33.3	(16.6)	(2.2)
Cash and cash equivalents at beginning of year excluding cash classified within assets held for sale	25.9	43.4	41.8
Cash and cash equivalents at beginning of year classified within assets held for sale	21.5	20.6	24.4
Cash and cash equivalents at beginning of year	47.4	64.0	66.2
Cash and cash equivalents at end of year	80.7	47.4	64.0
Eliminations/ Consolidations
Condensed Cash Flow Statements, Captions [Line Items]
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	(43.8)	(3.6)	(281.3)
INVESTING ACTIVITIES
Proceeds from sale of long-lived assets	0.0	0.0	0.0
Proceeds from sale of business, net of cash disposed of	0.0		0.0
Investments in property, plant and equipment	0.0	0.0	0.0
Investments in loans receivable	0.0	0.0
Net distributions from (investments in) unconsolidated affiliates	0.0	0.0
Cash contributed to TruGreen Joint Venture		0.0
Investments in acquired businesses, net of cash acquired	0.0	0.0	0.0
Return of investments from affiliates	(941.8)	(934.3)
Investment in marketing and license agreement			0.0
Investing cash flows from (to) affiliates	968.5	943.3	141.9
Net cash (used in) provided by investing activities	26.7	9.0	141.9
FINANCING ACTIVITIES
Borrowings under revolving and bank lines of credit and term loans	0.0	0.0	0.0
Repayments under revolving and bank lines of credit and term loans	0.0	0.0	0.0
Proceeds from issuance of Senior Notes	0.0	0.0
Repayment of 6.625% Senior Notes		0.0
Financing and issuance fees	0.0	0.0	0.0
Dividends paid	953.2	935.9	281.3
Distribution paid by AeroGrow to noncontrolling interest	32.4
Purchase of Common Shares	0.0	0.0	0.0
Payments on sellers notes	0.0	0.0	0.0
Excess tax benefits from share-based payment arrangements	0.0	0.0	0.0
Cash received from exercise of stock options	0.0	0.0	0.0
Financing cash flows from (to) affiliates	(968.5)	(941.3)	(141.9)
Net cash (used in) provided by financing activities	17.1	(5.4)	139.4
Effect of exchange rate changes on cash	0.0	0.0	0.0
Net increase (decrease) in cash and cash equivalents	0.0	0.0	0.0
Cash and cash equivalents at beginning of year excluding cash classified within assets held for sale	0.0	0.0	0.0
Cash and cash equivalents at beginning of year classified within assets held for sale	0.0	0.0	0.0
Cash and cash equivalents at beginning of year	0.0	0.0	0.0
Cash and cash equivalents at end of year	0.0	0.0	0.0
Senior Notes – 5.250%
FINANCING ACTIVITIES
Proceeds from issuance of Senior Notes	$ 250.0	0.0	0.0
Senior Notes – 5.250% | Senior Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	5.25%			5.25%
Senior Notes – 6.000%
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate						6.00%
FINANCING ACTIVITIES
Proceeds from issuance of Senior Notes	$ 0.0	$ 400.0	$ 0.0
Senior Notes – 6.000% | Senior Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate	6.00%	6.00%				6.00%
Senior Notes – 6.625% | Senior Notes
Condensed Cash Flow Statements, Captions [Line Items]
Interest rate		6.625%	6.625%		6.625%