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

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Class Of Warrant Or Right, Value Of Securities Called By Warrants Or Rights

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Maximum allowable percentage of voting power upon conversion.

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Represents the Company's economic interest of an acquired entity

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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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Share-Based Compensation Arrangement By Share-Based Payment Award, Expected Forfeiture Rate, Percentage

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The number of non-vested stock options outstanding as of the balance sheet date that are expected to vest, net of expected forfeitures.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to non-vested options outstanding, net or forfeitures, that are expected to vest under the plan as of the balance sheet date.

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The weighted average period between the balance sheet date and expiration for non-vested awards outstanding under the plan that are expected to vest in the future, which may be expressed in a decimal value for number of years.

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The weighted average price at which option holders may acquire shares when converting their stock options into shares for options expected to vest in future periods.

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Tender Offer For Ownership Of Voting Power, Percentage

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Unrecognized cost of unvested options awarded to employees as compensation.

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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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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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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 an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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EQUITY - Additional Information (Details) - USD ($)								1 Months Ended	12 Months Ended			50 Months Ended
EQUITY - Additional Information (Details) - USD ($)	Jun. 04, 2018	Oct. 30, 2017	Oct. 02, 2017	Jan. 30, 2017	Jan. 03, 2017	Nov. 29, 2016	May 26, 2016	Aug. 31, 2014	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2018	Nov. 28, 2016	Aug. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorization								$ 500,000,000.0						$ 1,000,000,000
Share repurchase authorization expire								5 years
Additional shares authorized repurchase														$ 500,000,000.0
Number of common shares repurchased (in shares)									3,500,000	2,700,000	1,800,000	8,300,000
Value of common shares repurchased to be held in treasury									$ 323,100,000	$ 245,800,000	$ 130,800,000	$ 714,600,000
Value of treasury shares for payment									32,200,000	$ 12,100,000	$ 22,800,000
Noncontrolling interest									$ 13,600,000
Dividends declared (USD per share)									$ 2.140	$ 2.03	$ 1.91
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
Common shares were available to underlie the grant of new share-based award (in shares)									3,600,000			3,600,000
Tax benefit realized from tax deduction associated with exercise of stock options and vesting of restricted share awards									$ 4,500,000
Intrinsic value of stock options exercised									17,200,000	14,500,000	$ 13,600,000
Cash received from exercise of stock options									10,500,000	11,000,000	$ 14,700,000
Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling interest									$ 7,900,000
Distribution declared by AeroGrow										$ 8,100,000
Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued under employee purchase plan (in shares)									700,000	500,000	700,000
Value of treasury shares for payment									$ 54,300,000	$ 38,600,000	$ 43,100,000
Capital in Excess of Stated Value
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of treasury shares for payment									(22,100,000)	$ (26,500,000)	$ (20,300,000)
Noncontrolling interest									$ 5,700,000
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
Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)									246,430	487,809	56,315
Expected weighted average period for unrecognized compensation cost									2 years 10 months
Compensation costs net yet recognized, restricted units, net									$ 30,600,000			$ 30,600,000
Total fair value of share-based payment awards vested									$ 3,400,000	$ 8,800,000	$ 5,800,000
Performance Based 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 Based Units \| Project Focus \| Minimum \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award		50.00%
Performance Based Units \| Project Focus \| Maximum \| Hawthorne
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award		250.00%
Performance Based 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 Based Units \| Project Focus \| Officer \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percent of target award				50.00%
Performance Based 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)									400,000	500,000	600,000
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted average period for unrecognized compensation cost									3 months 20 days
Compensation costs not yet recognized, net									$ 200,000			$ 200,000
Remaining unexercisable stock options expected to vest (in shares)									400,000			400,000
Weighted average exercise price of remaining unexercisable stock options expected to vest (USD per share)									$ 68.68			$ 68.68
Intrinsic value of remaining unexercisable stock options expected to vest									$ 4,100,000			$ 4,100,000
Average remaining term of remaining unexercisable stock options expected to vest in the future									7 years 3 months 10 days
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
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)									224,665	133,999	103,088
Expected weighted average period for unrecognized compensation cost									2 years 20 days
Compensation costs net yet recognized, restricted units, net									$ 10,600,000			$ 10,600,000
Total fair value of share-based payment awards vested									$ 6,300,000	$ 8,700,000	$ 7,600,000
Principal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership of outstanding common shares									27.00%			27.00%
Condition for ownership of voting stock									50.00%			50.00%
Tender offer for ownership of voting power (as a percent)									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%
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				$ 136,200,000
Contingent consideration paid			3,000,000						$ 3,000,000
Long-term debt			55,600,000							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]
Percent ownership						80.00%							45.00%
Dividends payable						$ 40,500,000
Dividends declared (USD per share)						$ 1.21
Bio-Organic Solutions, Inc. \| Treasury Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share issued under employee purchase plan (in shares)											100,000
Value of treasury shares for payment											$ 4,200,000
Growing media \| 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									$ 3,000,000	$ 9,200,000	$ 6,600,000