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

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Aggregate 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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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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The percentage of granted equity-based awards expected to be forfeited.

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Share based compensation award, option, contractual term at grant.

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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, Granted In Period, Fair Value

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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 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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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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Unrecognized cost of unvested share-based compensation awards.

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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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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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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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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Value of forfeitures of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Equity impact of the value of treasury stock (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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EQUITY - Additional Information (Details) - USD ($)					1 Months Ended	2 Months Ended	12 Months Ended			39 Months Ended
EQUITY - Additional Information (Details) - USD ($)	Jan. 30, 2017	Jan. 03, 2017	Nov. 29, 2016	Aug. 03, 2016	Aug. 31, 2014	Nov. 28, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock repurchase authorized amount					$ 500,000,000.0
Share repurchase authorization expire					5 years
Additional shares authorized repurchase				$ 500,000,000.0
Total repurchase amount				$ 1,000,000,000
Number of common shares repurchased (in shares)										4,800,000
Value of common shares repurchased to be held in treasury										$ 391,500,000
Dividends declared (USD per share)							$ 2.03	$ 1.91	$ 1.82
Distribution declared by AeroGrow							$ 8,100,000
Award vesting period							3 years
Term of stock option of grants							10 years
Common share available for issue under share-based plan (in shares)							7,300,000.0			7,300,000.0
Common shares were available to underlie the grant of new share-based award (in shares)							3,900,000			3,900,000
Total unrecognized compensation cost related to non-vested share-based awards							$ 41,500,000			$ 41,500,000
Expected weighted average period for unrecognized compensation cost							3 years 1 month
Tax benefit realized from tax deduction associated with exercise of stock options and vesting of restricted share awards							$ 20,500,000
Value of treasury shares for payment							2,900,000	$ 16,200,000	$ 37,600,000
Intrinsic value of stock options exercised							14,500,000	13,600,000	16,300,000
Cash received from exercise of stock options							11,000,000	$ 14,700,000	$ 24,300,000
Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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)							(500,000)	(700,000)	(900,000)
Value of treasury shares for payment							$ 29,400,000	$ 36,500,000	$ 50,000,000
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated share based award forfeited							15.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated share based award forfeited							20.00%
Performance Based Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)							487,809	56,315	78,352
Performance Based Units \| Project Focus \| Hawthorne \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation awards granted, other than options (in shares)						200,000
Performance period						4 years
Value of shares granted						$ 20,200,000
Performance Based Units \| Project Focus \| Minimum \| Hawthorne \| Subsequent Event
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 \| Subsequent Event
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)							500,000	600,000
Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining unexercisable stock options expected to vest (in shares)							800,000			800,000
Weighted average exercise price of remaining unexercisable stock options expected to vest (USD per share)							$ 66.17			$ 66.17
Intrinsic value of remaining unexercisable stock options expected to vest							$ 24,300,000			$ 24,300,000
Average remaining term of remaining unexercisable stock options expected to vest in the future							7 years 9 months 10 days
Options granted (in shares)							0
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)							133,999	103,088	108,376
Total fair value of share-based payment awards vested							$ 8,700,000	$ 7,600,000	$ 6,200,000
Principal Owner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership of outstanding common shares							26.00%			26.00%
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%
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	200,000
Value of treasury shares for payment								$ 4,200,000	$ 8,300,000
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
Percent ownership			45.00%
Parent ownership percentage			80.00%
Dividends payable			$ 40,500,000
Dividends declared (USD per share)			$ 1.21
AeroGrow International, Inc \| Non-controlling Interest
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Distribution declared by AeroGrow		$ 8,100,000