SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	6 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Accounting	The Company’s unaudited condensed consolidated financial statements for the three and six months ended March 31, 2018 and April 1, 2017 are presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
Consolidation	The condensed consolidated financial statements include the accounts of Scotts Miracle-Gro and its subsidiaries. All intercompany transactions and accounts have been eliminated in consolidation. The Company’s consolidation criteria are based on majority ownership (as evidenced by a majority voting interest in the entity) and an objective evaluation and determination of effective management control. AeroGrow International, Inc. (“AeroGrow”), in which the Company has a controlling interest, is consolidated, with the equity owned by other shareholders shown as noncontrolling interest in the Condensed Consolidated Balance Sheets, and the other shareholders’ portion of net earnings and other comprehensive income shown as net income (loss) or comprehensive (income) loss attributable to noncontrolling interest in the Condensed Consolidated Statements of Operations and Condensed Consolidated Statements of Comprehensive Income (Loss), respectively.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes and related disclosures. Although these estimates are based on management’s best knowledge of current events and actions the Company may undertake in the future, actual results ultimately may differ from the estimates.
Loans Receivable	Loans Receivable Loans receivable are carried at outstanding principal amount, and are recognized in the “Other assets” line in the Condensed Consolidated Balance Sheets. Loans receivable are impaired when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement. If it is determined that an impairment has occurred, an impairment loss is recognized for the amount by which the carrying value of the asset exceeds the present value of expected future cash flows and recorded in operating expenses in the Condensed Consolidated Statements of Operations. Interest income is recorded on an accrual basis. For the three and six months ended March 31, 2018, the Company has classified interest income on loans receivable of $2.5 million and $5.0 million, respectively, in the “Other non-operating expense, net” line in the Condensed Consolidated Statements of Operations. For the three and six months ended April 1, 2017, interest income on loans receivable of $2.1 million and $4.8 million, respectively, is classified in the “Other (income) expense, net” line in the Condensed Consolidated Statements of Operations.
Statements of Cash Flows	The Company uses the “cumulative earnings” approach for determining cash flow presentation of distributions from unconsolidated affiliates. Distributions received are included in the Condensed Consolidated Statements of Cash Flows as operating activities, unless the cumulative distributions exceed the portion of the cumulative equity in the net earnings of the unconsolidated affiliate, in which case the excess distributions are deemed to be returns of the investment and are classified as investing activities in the Condensed Consolidated Statements of Cash Flows.
Recently Adopted & Issued Accounting Pronouncements	RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS Income Taxes On December 22, 2017, H.R.1 (the “Act,” formerly known as the “Tax Cuts and Jobs Act”) was signed into law and provides for significant changes to the U.S. Internal Revenue Code of 1986, as amended (the “Code”). Among other items, the Act implements a territorial tax system, imposes a one-time transition tax on deemed repatriated earnings of foreign subsidiaries, and permanently reduces the federal corporate tax rate to 21% effective January 1, 2018. Additionally, the SEC released Staff Accounting Bulletin No. 118 (“SAB 118”) which provides guidance on accounting for the Act’s impact under Accounting Standards Codification (“ASC”) Topic 740, Income Taxes (“ASC 740”). The guidance in SAB 118 addresses certain fact patterns where the accounting for changes in tax laws or tax rates under ASC 740 is incomplete upon issuance of an entity's financial statements for the reporting period in which the Act is enacted. Under the staff guidance in SAB 118, in the financial reporting period in which the Act is enacted, the income tax effects of the Act (i.e., only for those tax effects in which the accounting under ASC 740 is incomplete) would be reported as a provisional amount based on a reasonable estimate (to the extent a reasonable estimate can be determined), which would be subject to adjustment during a “measurement period” until the accounting under ASC 740 is complete. The measurement period is limited to no more than one year beyond the enactment date under the staff's guidance. SAB 118 also describes supplemental disclosures that should accompany the provisional amounts, including the reasons for the incomplete accounting, the additional information or analysis that is needed, and other information relevant to why the registrant was not able to complete the accounting required under ASC 740 in a timely manner. For discussion of the impacts of the Act that are material to the Company and required disclosures related to the Act pursuant to the guidance provided under SAB 118, refer to “NOTE 11. INCOME TAXES.” Share-Based Compensation In March 2016, the Financial Accounting Standards Board (“FASB”) issued an accounting standard update that simplifies several aspects of the accounting for employee share-based payment transactions, including the accounting for income taxes, forfeitures, and statutory tax withholding requirements, as well as classification in the statement of cash flows. The Company adopted this guidance effective October 1, 2017. The impact resulting from the adoption of this amended guidance is summarized below. The amended accounting guidance requires all excess tax benefits and tax deficiencies to be recognized as income tax benefit or expense on a prospective basis in the period of adoption. The adoption of this provision of the amended accounting guidance resulted in the recognition of excess tax benefits of $1.5 million and $1.9 million in the “Income tax expense (benefit) from continuing operations” line in the Condensed Consolidated Statement of Operations for the three and six months ended March 31, 2018, respectively. As the Company adopted the guidance on a prospective basis, prior year activity has not been adjusted to conform with the current presentation and excess tax benefits of $3.2 million and $4.0 million have been recognized in the “Capital in excess of stated value” line within “Total equity—controlling interest” in the Condensed Consolidated Balance Sheets for the three and six months ended April 1, 2017, respectively. The amended accounting guidance requires excess tax benefits to be classified as an operating activity in the statement of cash flows. Previously, excess tax benefits were presented as a cash inflow from financing activities and cash outflow from operating activities. The Company has elected to present these changes on a prospective basis and therefore the six months ended April 1, 2017 has not been adjusted to conform with the current presentation. The amended accounting guidance requires cash paid to a tax authority when shares are withheld to satisfy statutory income tax withholding obligations to be classified as a financing activity in the statement of cash flows. The Company’s retrospective adoption of this provision of the amended accounting guidance resulted in the classification of payments of $2.9 million and $8.8 million as cash outflows from financing activities for the six months ended March 31, 2018 and April 1, 2017, respectively. The Company has elected to continue to estimate the number of awards expected to vest, as permitted by the amended accounting guidance, rather than electing to account for forfeitures as they occur. Derivatives and Hedging In August 2017, the FASB issued an accounting standard update that modifies hedge accounting by making more hedge strategies eligible for hedge accounting, amending presentation and disclosure requirements, and changing how companies assess effectiveness. The intent is to simplify application of hedge accounting and increase transparency of information about an entity’s risk management activities. The Company early adopted this guidance effective October 1, 2017. The adoption of this guidance did not have a significant impact on the Company’s consolidated financial position, results of operations or cash flows. Inventory In July 2015, the FASB issued an accounting standard update that requires inventory to be measured “at the lower of cost and net realizable value,” thereby simplifying the current guidance that requires inventory to be measured at the lower of cost or market (market in this context is defined as one of three different measures, one of which is net realizable value). The Company adopted this guidance on a prospective basis effective October 1, 2017. The adoption of this guidance did not have a significant impact on the Company’s consolidated financial position, results of operations or cash flows. Income Taxes In November 2015, the FASB issued an accounting standard update to simplify the presentation of deferred income taxes by requiring that deferred income tax liabilities and assets be classified as noncurrent in a classified statement of financial position. The Company adopted this guidance on a retrospective basis during the fourth quarter of fiscal 2017. As a result, deferred tax assets totaling $43.1 million have been presented net within other liabilities in the Condensed Consolidated Balance Sheet as of April 1, 2017. This amount was previously reported within prepaid and other current assets. RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS Revenue Recognition from Contracts with Customers In May 2014, the FASB issued amended accounting guidance that replaces most existing revenue recognition guidance under GAAP. This guidance requires companies to recognize revenue in a manner that depicts the transfer of promised goods or services to customers in amounts that reflect the consideration to which a company expects to be entitled in exchange for those goods or services. The standard involves a five-step process that includes identifying the contract with the customer, identifying the performance obligations in the contract, determining the transaction price, allocating the transaction price to the performance obligations in the contract and recognizing revenue when the entity satisfies the performance obligations. The new standard also will result in enhanced disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. Subsequently, additional guidance was issued on several areas including guidance intended to improve the operability and understandability of the implementation of principal versus agent considerations and clarifications on the identification of performance obligations and implementation of guidance related to licensing. The Company has made progress on its evaluation of the amended guidance, including identification of revenue streams and customer contract reviews. The Company is applying the five-step model to those contracts and revenue streams to evaluate the quantitative and qualitative impacts the new standard will have on its business and reported revenues. The provisions are effective for the Company in the first quarter of fiscal 2019 and the Company expects to adopt under the modified retrospective approach, which recognizes the cumulative effect of adoption as an adjustment to retained earnings at the date of initial application. The Company’s revenue is primarily product sales, which are recognized at a point in time when title transfers to customers and the Company has no further obligation to provide services related to such products. Although the Company is continuing to assess the impact of the amended guidance, it generally anticipates that its timing of recognition of revenue will be substantially unchanged under the amended guidance. Leases In February 2016, the FASB issued an accounting standard update which significantly changes the accounting for leases. This guidance requires lessees to recognize a lease liability for the obligation to make lease payments and a right-of-use asset for the right to use the underlying asset for the lease term. The provisions are effective for the Company’s financial statements no later than the fiscal year beginning October 1, 2019 and require a modified retrospective transition approach for leases that exist as of or are entered into after the beginning of the earliest comparative period presented in the financial statements. The Company is currently evaluating the impact of this standard on its consolidated results of operations, financial position and cash flows. The Company has made progress on its evaluation of the amended guidance, including identification of the population of leases affected, determining the information required to calculate the lease liability and right-of-use asset and evaluating models to assist in future reporting. Cash Flow Presentation In August 2016, the FASB issued an accounting standard update that amends the guidance on the classification of certain cash receipts and payments in the statement of cash flows. The provisions are effective retrospectively for the Company’s financial statements no later than the fiscal year beginning October 1, 2018, and are not expected to have a significant impact on the Company’s consolidated cash flows. Business Combinations In January 2017, the FASB issued an accounting standard update that clarifies the definition of a business to provide additional guidance to assist in evaluating whether transactions should be accounted for as an acquisition (or disposal) of either an asset or business. The provisions are effective prospectively for the Company’s financial statements no later than the fiscal year beginning October 1, 2018, and are not expected to have a significant impact on the Company’s consolidated financial position, results of operations or cash flows. Goodwill In January 2017, the FASB issued an accounting standard update which removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of step 2 of the goodwill impairment test. Goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of the goodwill. The provisions are effective prospectively for the Company’s financial statements no later than the fiscal year beginning October 1, 2020, and are not expected to have a significant impact on the Company’s consolidated financial position, results of operations or cash flows. Employee Benefit Plans In March 2017, the FASB issued an accounting standard update which requires entities to (1) disaggregate the current-service-cost component from the other components of net benefit cost (the “other components”) and present it with other current compensation costs for related employees in the income statement, (2) present the other components elsewhere in the income statement and outside of income from operations if that subtotal is presented and (3) limit the amount of costs eligible for capitalization (e.g., as part of inventory or property, plant, and equipment) to only the service-cost component of net benefit cost. The provisions are effective for the Company’s financial statements no later than the fiscal year beginning October 1, 2018, and are required to be applied retrospectively for the presentation of cost components in the income statement and prospectively for the capitalization of cost components. The provisions are not expected to have a significant impact on the Company’s consolidated financial position, results of operations or cash flows.

Disclosure of accounting policy for those finance, loan and lease receivables classified as held for investment. This disclosure may include (1) the basis at which such receivables are carried in the entity's statements of financial position (2) how the level of the allowance for loan and lease losses is determined (3) when impairments, charge-offs or recoveries are recognized for such receivables (4) the treatment of commitment and other fees and loan origination costs (including, if applicable, how the entity accounts for fees and costs associated with credit cards that are either purchased or originated) (5) the treatment of any premiums or discounts or unearned income (6) the entity's income recognition policies for such receivables, including those that are impaired, past due or placed on nonaccrual status (for impaired loans, the policy for recognizing interest income on such loans, including how cash receipts are recorded) and (7) the treatment of foreclosures or repossessions.