DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
Mar. 31, 2026
Organization, Consolidation and Presentation of Financial Statements [Abstract]
DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION About Griffon Corporation Griffon Corporation (the “Company,” “Griffon,” “we” or “us”) is a leading provider of residential and commercial building products. The Company is the largest North American manufacturer and marketer of garage doors under the Clopay, IDEAL and Holmes brands, and rolling steel door and grille products under the Clopay, Cornell, and Cookson brands. The Company is also a leading provider of residential, industrial, and commercial ceiling fans sold under the Hunter, Casablanca, and Jan Fan brands. The Company, founded in 1959, is organized as a Delaware corporation headquartered in New York, N.Y. and listed on the New York Stock Exchange (NYSE:GFF). On February 5, 2026, Griffon announced it entered into a definitive agreement to form a joint venture with ONCAP, the mid-market private equity platform of Onex Corporation (TSX:ONEX), to create a leading global provider of hand tools, home organization solutions, and lawn and garden products for professionals and consumers. The joint venture will combine the United States and Canada businesses of Griffon’s AMES Companies (“AMES”) with the Bellota Tools, Corona, and Burgon & Ball businesses of Venanpri, an ONCAP majority-owned portfolio company. The joint venture will be managed as a subsidiary of Venanpri which, together with other affiliates of ONCAP, will hold a 57% equity interest. Upon closing of the transaction, Griffon will receive consideration of $100,000 in cash, subject to working capital adjustments, will enter into a credit agreement with the joint venture to evidence a $161,100 second-lien loan provided to the joint venture, and will participate in the governance and oversight of the joint venture as a 43% equity holder. Griffon will accrue interest receivable on the second-lien loan through the date of maturity. The joint venture will be financed through committed debt financing, in addition to the second-lien loan provided by Griffon. This transaction is subject to customary closing conditions and, after closing, which is expected to occur by the end of June 2026, Griffon’s interest in the joint venture will be accounted for as an equity method investment. As of March 31, 2026, the Company recorded a loss of $22,648 on assets held for sale because the carrying value of the United States (“U.S.”) and Canada businesses of the AMES Companies is greater than its estimated fair value less its cost to sell. Griffon also announced on February 5, 2026 the initiation of a comprehensive review of strategic alternatives for its AMES Australia and United Kingdom ("U.K.") operations. The strategic process for AMES Australia is active and ongoing and we expect to complete the process by the end of the calendar year. As of March 31, 2026, the Company ceased its AMES U.K. operations and will liquidate its assets and settle its liabilities. As a result of these actions, AMES’ U.S., Canada, Australia, and U.K. operations have been reported as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented. Except for certain U.K. assets and liabilities not held for sale, we classified the assets and liabilities associated with the AMES' U.S., Canada, Australia and U.K. discontinued operations as held for sale in the Condensed Consolidated Balance Sheets. The U.K. assets classified as held for sale relate to inventory and property, plant and equipment that will be sold in liquidation. Accordingly, all references made to results and information in this Quarterly Report on Form 10-Q are to Griffon's continuing operations, unless specifically noted otherwise. Refer to Note 15, Discontinued Operations for further details. Griffon now conducts its operations through one reportable segment, managed on a consolidated basis. All prior period comparative segment information presented has been applied retrospectively to reflect the new segment structure. For further information regarding our segment reporting, see Note 12, Reportable Segment. Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information, and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all the information and footnotes required by US GAAP for complete financial statements. As such, they should be read together with Griffon’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, which provides a more complete explanation of Griffon’s accounting policies, financial position, operating results, business, properties and other matters. In the opinion of management, these financial statements reflect all adjustments considered necessary for a fair statement of interim results. Griffon’s businesses are seasonal; for this and other reasons, the financial results of the Company for any interim period are not necessarily indicative of the results for the full year. The Condensed Consolidated Balance Sheet information at September 30, 2025 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2025. The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. Certain amounts in prior years may have been reclassified to conform to the current year presentation. The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. These estimates may be adjusted due to changes in economic, industry or customer financial conditions, as well as changes in technology or demand. Significant estimates include expected loss allowances for credit losses and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, assumptions associated with pension benefit obligations and income or expenses, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, assumptions associated with stock based compensation valuation, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations and the accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions Griffon may undertake in the future. Actual results may ultimately differ from these estimates.

Griffon Corporation (the “Company,” “Griffon,” “we” or “us”) is a leading provider of residential and commercial building products. The Company is the largest North American manufacturer and marketer of garage doors under the Clopay, IDEAL and Holmes brands, and rolling steel door and grille products under the Clopay, Cornell, and Cookson brands. The Company is also a leading provider of residential, industrial, and commercial ceiling fans sold under the Hunter, Casablanca, and Jan Fan brands.

On February 5, 2026, Griffon announced it entered into a definitive agreement to form a joint venture with ONCAP, the mid-market private equity platform of Onex Corporation (TSX:ONEX), to create a leading global provider of hand tools, home organization solutions, and lawn and garden products for professionals and consumers. The joint venture will combine the United States and Canada businesses of Griffon’s AMES Companies (“AMES”) with the Bellota Tools, Corona, and Burgon & Ball businesses of Venanpri, an ONCAP majority-owned portfolio company. The joint venture will be managed as a subsidiary of Venanpri which, together with other affiliates of ONCAP, will hold a 57% equity interest. Upon closing of the transaction, Griffon will receive consideration of $100,000 in cash, subject to working capital adjustments, will enter into a credit agreement with the joint venture to evidence a $161,100 second-lien loan provided to the joint venture, and will participate in the governance and oversight of the joint venture as a 43% equity holder. Griffon will accrue interest receivable on the second-lien loan through the date of maturity. The joint venture will be financed through committed debt financing, in addition to the second-lien loan provided by Griffon. This transaction is subject to customary closing conditions and, after closing, which is expected to occur by the end of June 2026, Griffon’s interest in the joint venture will be accounted for as an equity method investment. As of March 31, 2026, the Company recorded a loss of $22,648 on assets held for sale because the carrying value of the United States (“U.S.”) and Canada businesses of the AMES Companies is greater than its estimated fair value less its cost to sell.

Griffon also announced on February 5, 2026 the initiation of a comprehensive review of strategic alternatives for its AMES Australia and United Kingdom ("U.K.") operations. The strategic process for AMES Australia is active and ongoing and we expect to complete the process by the end of the calendar year. As of March 31, 2026, the Company ceased its AMES U.K. operations and will liquidate its assets and settle its liabilities. As a result of these actions, AMES’ U.S., Canada, Australia, and U.K. operations have been reported as discontinued operations in the Condensed Consolidated Statements of Operations for all periods presented. Except for certain U.K. assets and liabilities not held for sale, we classified the assets and liabilities associated with the AMES' U.S., Canada, Australia and U.K. discontinued operations as held for sale in the Condensed Consolidated Balance Sheets. The U.K. assets classified as held for sale relate to inventory and property, plant and equipment that will be sold in liquidation. Accordingly, all references made to results and information in this Quarterly Report on Form 10-Q are to Griffon's continuing operations, unless specifically noted otherwise. Refer to Note 15, Discontinued Operations for further details.

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“US GAAP”) for interim financial information, and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all the information and footnotes required by US GAAP for complete financial statements. As such, they should be read together with Griffon’s Annual Report on Form 10-K for the fiscal year ended September 30, 2025, which provides a more complete explanation of Griffon’s accounting policies, financial position, operating results, business, properties and other matters. In the opinion of management, these financial statements reflect all adjustments considered necessary for a fair statement of interim results. Griffon’s businesses are seasonal; for this and other reasons, the financial results of the Company for any interim period are not necessarily indicative of the results for the full year.

The preparation of financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting periods. These estimates may be adjusted due to changes in economic, industry or customer financial conditions, as well as changes in technology or demand. Significant estimates include expected loss allowances for credit losses and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, assumptions associated with pension benefit obligations and income or expenses, useful lives associated with depreciation and amortization of intangible and fixed assets, warranty reserves, sales incentive accruals, assumptions associated with stock based compensation valuation, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves, the valuation of assets and liabilities of discontinued operations and the accompanying disclosures. These estimates are based on management’s best knowledge of current events and actions Griffon may undertake in the future. Actual results may ultimately differ from these estimates.