Additional amount of common shares authorized to be repurchased through authorized repurchase program.

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Maximum allowable percentage of voting power upon conversion.

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Employee Service Share Based Compensation, Tax Benefit Realized From Exercise of Share Based Awards and Vesting of Restricted Stock

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Percentage of continuing ownership interest by significant shareholders.

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Performance Period

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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Cash outflow representing an adjustment to the purchase price of a previous acquisition.

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Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

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EQUITY - Additional Information (Details) - USD ($)									1 Months Ended	3 Months Ended				12 Months Ended			62 Months Ended
EQUITY - Additional Information (Details) - USD ($)	Jul. 30, 2019	Aug. 06, 2018	Jun. 04, 2018	Oct. 30, 2017	Oct. 02, 2017	Jan. 30, 2017	Jan. 03, 2017	Nov. 29, 2016	Aug. 31, 2014	Sep. 30, 2019	Mar. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2019	Nov. 28, 2016	Aug. 03, 2016	May 26, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Write off of foreign currency loss adjustment											$ 2,500,000		$ 11,700,000	$ (2,500,000)	$ (11,700,000)	$ (18,500,000)
Dividends declared (USD per share)	$ 0.58	$ 0.55										$ 0.53		$ 2.23	$ 2.140	$ 2.03
Stock repurchase authorization									$ 500,000,000.0										$ 1,000,000,000.0
Stock repurchase period (years)									5 years
Additional shares authorized repurchase																			$ 500,000,000.0
Number of common shares repurchased (in shares)														0	3,500,000	2,700,000	8,300,000
Value of common shares repurchased to be held in treasury															$ 323,100,000	$ 245,800,000	$ 714,600,000
Value of treasury shares for payment														$ 21,500,000	32,200,000	12,100,000
Distribution declared by AeroGrow																8,100,000
Award vesting period														3 years
Common share available for issue under share-based plan (in shares)										7,300,000				7,300,000			7,300,000
Common shares were available to underlie the grant of new share-based award (in shares)										3,000,000.0				3,000,000.0			3,000,000.0
Tax benefit realized from tax deduction associated with exercise of stock options and vesting of restricted share awards														$ 2,800,000
Intrinsic value of stock options exercised														17,500,000	17,200,000	14,500,000
Cash received from exercise of stock options														$ 21,400,000	$ 10,500,000	$ 11,000,000.0
Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued under employee purchase plan (in shares)														400,000	700,000	500,000
Value of treasury shares for payment														$ 38,000,000.0	$ 54,300,000	$ 38,600,000
Capital in Excess of Stated Value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of treasury shares for payment														$ (16,500,000)	$ (22,100,000)	(26,500,000)
Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution declared by AeroGrow																8,100,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period														3 years
Expected forfeiture rate														15.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period														5 years
Expected forfeiture rate														20.00%
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period														1 year
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs not yet recognized, net										$ 0				$ 0			$ 0
Options granted (in shares)														0	0
Options \| Project Focus \| Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period														10 years
Performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)														131,644
Expected weighted average period for unrecognized compensation cost														2 years 1 month 6 days
Compensation costs net yet recognized, restricted units, net										$ 26,600,000				$ 26,600,000			26,600,000
Total fair value of share-based payment awards vested														$ 3,900,000	$ 3,400,000	$ 8,800,000
Performance units \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)										100,000
Performance units \| Project Focus \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				4 years
Share-based compensation awards granted, other than options (in shares)				200,000
Performance period				4 years
Fair value of award units granted				$ 20,200,000
Performance units \| Project Focus \| Minimum \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award				50.00%
Performance units \| Project Focus \| Maximum \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award				250.00%
Performance units \| Project Focus \| Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period						5 years
Share-based compensation awards granted, other than options (in shares)						500,000
Performance period						5 years
Fair value of award units granted						$ 43,300,000
Performance units \| Project Focus \| Officer \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award						50.00%
Performance units \| Project Focus \| Officer \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award						250.00%
Share-Based Compensation Awards And Employee Stock Purchase Plan \| Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued under employee purchase plan (in shares)														500,000	400,000	500,000
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)														198,635
Expected weighted average period for unrecognized compensation cost														1 year 9 months 18 days
Compensation costs net yet recognized, restricted units, net										$ 10,200,000				$ 10,200,000			$ 10,200,000
Total fair value of share-based payment awards vested														$ 6,300,000	$ 6,300,000	$ 8,700,000
Principal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership of outstanding common shares										26.00%				26.00%			26.00%
Condition for ownership of voting stock										50.00%				50.00%			50.00%
Tender offer for ownership of voting power (as a percent)										100.00%				100.00%			100.00%
Miracle-Gro
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Condition for ownership of voting stock										49.00%				49.00%			49.00%
Sunlight Supply
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total consideration transferred			$ 459,100,000
Sunlight Supply \| Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued under employee purchase plan (in shares)			300,000
Value of treasury shares for payment			$ 20,700,000
Gavita Holdings B.V.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Economic interest acquired					25.00%															75.00%
Total consideration transferred					$ 69,200,000
Contingent consideration paid					3,000,000.0										3,000,000.0
Long-term debt					55,600,000
Noncontrolling interest					7,900,000
Gavita Holdings B.V. \| Capital in Excess of Stated Value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest					$ 5,700,000
AeroGrow International, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends declared (USD per share)								$ 1.21
Percent ownership								80.00%										45.00%
Dividends payable								$ 40,500,000
US Consumer: \| AeroGrow International, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of shares called by warrants								$ 47,800,000
Number of shares called by warrants (in shares)								21,600,000
AeroGrow International, Inc \| Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution declared by AeroGrow							$ 8,100,000
Accounting Standards Update 2016-09
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash payments to tax authority when shares are withheld														$ 2,700,000	$ 3,000,000.0	$ 9,200,000