DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]
Consolidation	Consolidation The consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. The results of operations of acquired businesses are included from the dates of acquisitions.
Earnings per share	Earnings per share Due to rounding, the sum of earnings per share may not equal earnings per share of Net income.
Discontinued operations	Discontinued operationsFor the years ended September 30, 2022, 2021 and 2020, discontinued operations includes the Telephonics business, and the assets and liabilities of discontinued installations business and other discontinued activities which have been segregated from Griffon's continuing operations primarily related to insurance claims, product liability, warranty and environmental reserves.
Reclassifications	Reclassifications Certain amounts in prior years have been reclassified to conform to the current year presentation.
Use of estimates	Use of estimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States 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 doubtful accounts receivable 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, assumption 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, assumptions associated with valuation of acquired assets and assumed liabilities of acquired companies 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.
Cash and equivalents	Cash and equivalents Griffon considers all highly liquid investments purchased with an initial maturity of three months or less to be cash equivalents. Cash equivalents primarily consist of overnight commercial paper, highly-rated liquid money market funds backed by U.S. Treasury securities and U.S. Agency securities, as well as insured bank deposits. Griffon had cash in non-U.S. bank accounts of approximately $54,200 and $65,000 at September 30, 2022 and 2021, respectively. Substantially all U.S. cash and equivalents are in excess of FDIC insured limits. Griffon regularly evaluates the financial stability of all institutions and funds that hold its cash and equivalents.
Fair value of financial instruments	Fair value of financial instruments The carrying values of cash and cash equivalents, accounts receivable, accounts and notes payable and revolving credit debt approximate fair value due to either the short-term nature of such instruments or the fact that the interest rate of the revolving credit debt is based upon current market rates. The fair value hierarchy, as outlined in the applicable accounting guidance, establishes a fair value hierarchy that requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the hierarchy is based on the lowest level of input that is significant to the fair value measurement. The accounting guidance establishes three levels of inputs that may be used to measure fair value, as follows: •Level 1 inputs are measured and recorded at fair value based upon quoted prices in active markets for identical assets. •Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities. •Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The Company accounts for acquisitions under the acquisition method, in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition using a method substantially similar to the goodwill impairment test methodology (level 3 inputs). The operating results of the acquired companies are included in Griffon’s consolidated financial statements from the date of acquisition in each instance.
Non-U.S. currency translation	Non-U.S. currency translation Assets and liabilities of non-U.S. subsidiaries, where the functional currency is not the U.S. dollar, have been translated at year-end exchange rates and profit and loss accounts have been translated using weighted average exchange rates during the applicable fiscal year. Adjustments resulting from currency translation are recorded in AOCI as cumulative translation adjustments. The Company recognized cumulative translation losses of $37,920 during 2022 and gains of $6,433 during 2021. As of September 30, 2022 and 2021, the cumulative foreign currency translation recorded in AOCI was a loss of $57,170 and $19,250, respectively. Assets and liabilities of an entity that are denominated in currencies other than that entity’s functional currency are re-measured into the functional currency using period end exchange rates, or historical rates where applicable to certain balances. Gains and losses arising on remeasurements are recorded within the Consolidated Statement of Operations and Comprehensive Income as a component of Other income (expense).
Revenue recognition	Revenue recognition The Company recognizes revenue when performance obligations identified under the terms of contracts with its customers are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting. A contract with a customer is an agreement which both parties have approved, that creates enforceable rights and obligations, has commercial substance and with respect to which payment terms are identified and collectability is probable. Once the Company has entered into a contract or purchase order, it is evaluated to identify performance obligations. For each performance obligation, revenue is recognized when control of the promised products is transferred to the customer, or services are satisfied under the contract or purchase order, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products or services (the transaction price). The Company’s performance obligations are recognized at a point in time related to the manufacture and sale of a broad range of products and components, and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer, which is generally upon shipment. The Company recognizes revenue when performance obligations identified under the terms of contracts with its customers are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting. A contract with a customer is an agreement which both parties have approved, that creates enforceable rights and obligations, has commercial substance and with respect to which payment terms are identified and collectability is probable. Once the Company has entered into a contract or purchase order, it is evaluated to identify performance obligations. For each performance obligation, revenue is recognized when control of the promised products is transferred to the customer, or services are satisfied under the contract or purchase order, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products or services (the transaction price). A contract's transaction price is allocated to each distinct performance obligation and recognized as revenue when each performance obligation is satisfied. A majority of the Company’s contracts have a single performance obligation which represents, in most cases, the product being sold to the customer. To a lesser extent, some contracts include multiple performance obligations such as a product, the related installation, and extended warranty services. These contracts require judgment in determining the number of performance obligations. For contracts with multiple performance obligations, judgment is required to determine whether performance obligations specified in these contacts are distinct and should be accounted for as separate revenue transactions for recognition purposes. In these types of contracts, the Company allocates the total transaction price to each performance obligation in an amount based on the estimated relative standalone selling prices of the promised goods or services underlying each performance obligation. The Company uses an observable price to determine the stand-alone selling price for separate performance obligations or a cost plus margin approach when one is not available. The transaction price includes variable consideration, such as discounts and volume rebates, when it is probable that a significant reversal of revenue recognized will not occur. Variable consideration is determined using either the expected value or the most likely amount of consideration to be received based on historical experience and the specific facts and circumstances at the time of evaluation. See Note 18 - Business Segments for revenue from contracts with customers disaggregated by end markets, segments and geographic location. The Company’s performance obligations are recognized at a point in time related to the manufacture and sale of a broad range of products and components and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer, which is generally upon shipment. A majority of the Company's revenue is short cycle in nature with shipments occurring within one year from order and does not include a material long-term financing component, implicitly or explicitly. Payment terms generally range between 15 to 90 days and vary by the location of the business, the type of products manufactured to be sold and the volume of products sold, among other factors. The Company recognizes revenue from product sales when all factors are met, including when control of a product transfers to the customer upon its shipment, completion of installation, testing, certification or other substantive acceptance required under the contract. Other than standard product warranty provisions, sales arrangements provide for no other significant post-shipment obligations on the Company. From time-to-time and for certain customers, rebates and other sales incentives, promotional allowances or discounts are offered, typically related to customer purchase volumes, all of which are fixed or determinable and are classified as a reduction of revenue and recorded at the time of sale. Griffon provides for sales returns and allowances based upon historical returns experience. The Company includes shipping costs billed to customers in revenue and the related shipping costs in either Cost of Goods and Services or Selling, General and Administrative expenses. The majority of the Company’s contracts offer assurance-type warranties in connection with the sale of a product to a customer. Assurance-type warranties provide a customer with assurance that the related product will function as the parties intended because it complies with agreed-upon specifications. Such warranties do not represent a separate performance obligation. Payment terms vary depending on the type and location of the customer and the products or services offered. Generally, the period between the time revenue is recognized and the time payment is due is not significant. Shipping and handling charges are not considered a separate performance obligation. Additionally, all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected from a customer (e.g., sales, use, value added, and some excise taxes) are excluded from revenue.
Accounts receivable, allowance for doubtful accounts and concentrations of credit risk	Accounts receivable, expected loss allowance for doubtful accounts and concentrations of credit risk Accounts receivable is composed principally of trade accounts receivable, that arise from the sale of goods or services on account, and is stated at historical cost. A substantial portion of Griffon’s trade receivables are from Home Depot, whose financial condition is dependent on the construction and related retail sectors of the economy. As a percentage of consolidated accounts receivable, Home Depot was 17%. Griffon performs continuing evaluations of the financial condition of its customers, and although Griffon generally does not require collateral, letters of credit may be required from customers in certain circumstances. Trade receivables are recorded at the stated amount, less expected loss allowance for doubtful accounts and, when appropriate, for customer program reserves and cash discounts. The expected loss allowance represents estimated uncollectible receivables associated with potential customer defaults on contractual obligations (usually due to customers’ potential insolvency). The expected loss allowance for doubtful accounts includes amounts for certain customers where a risk of default has been specifically identified, as well as an amount for customer defaults based on a formula when it is determined the risk of some default is probable and estimable, but cannot yet be associated with specific customers. The provision related to the expected loss allowance for doubtful accounts is recorded in Selling, general and administrative ("SG&A") expenses. The Company writes-off accounts receivable when they are deemed to be uncollectible. Customer program reserves and cash discounts are netted against accounts receivable when it is customer practice to reduce invoices for these amounts. The amounts netted against accounts receivable in 2022 and 2021 were $69,656 and $49,833, respectively. All accounts receivable amounts are expected to be collected in less than one year. The Company does not currently have customers or contracts that prescribe specific retainage provisions.
Inventories	Inventories Inventories, stated at the lower of cost (first-in, first-out or average) or net realizable value, include material, labor and manufacturing overhead costs. Griffon’s businesses typically do not require inventory that is susceptible to becoming obsolete or dated. In general, HBP produces residential and commercial sectional garage doors, commercial rolling steel door and grille products, and CPP produces long-handled tools and landscaping products, and storage and organizational products, both in response to orders from customers of retailers and dealers or based on expected orders, as applicable.
Long-Lived Assets	Long-Lived Assets, Including Intangible Assets Property, plant and equipment includes the historical cost of land, buildings, equipment and significant improvements to existing plant and equipment or, in the case of acquisitions, a fair market value appraisal of such assets completed at the time of acquisition. Expenditures for maintenance, repairs and minor renewals are expensed as incurred. When property or equipment is sold or otherwise disposed of, the related cost and accumulated depreciation is removed from the respective accounts and the gain or loss is recognized. Depreciation expense, which includes amortization of assets under capital leases, was $46,443, $42,741 and $42,614 in 2022, 2021 and 2020, respectively, and was calculated on a straight-line basis over the estimated useful lives of the assets. Depreciation included in SG&A expenses was $16,683, $14,362 and $13,944 in 2022, 2021 and 2020, respectively. The remaining components of depreciation, attributable to manufacturing operations, are included in Cost of goods and services. Estimated useful lives for property, plant and equipment are as follows: buildings and building improvements, 25 to 40 years; machinery and equipment, 2 to 15 years; and leasehold improvements, over the term of the lease or life of the improvement, whichever is shorter.
Intangible Assets	Long-lived assets, including customer relationships and software, and tangible assets, primarily property, plant and equipment, are amortized over their expected useful lives, which involve significant assumptions and estimates. We assess the recoverability of the carrying amount of our long-lived assets, including amortizable intangible assets, whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable. We evaluate the recoverability of such assets based on the expectations of undiscounted cash flows attributable to the asset group. If the sum of the expected future undiscounted cash flows are less than the carrying amount of the asset group, a loss would be recognized for the difference between the fair value and the carrying amount. For the fiscal year ended September 30, 2022, we tested long-lived intangible and tangible assets for impairment by comparing estimated future undiscounted cash flows of each CPP asset group to the carrying amount of the asset group and determined that an impairment did not exist. No event or indicator of impairment existed for the HBP assets groups.
Goodwill and indefinite-lived intangibles	Goodwill and indefinite-lived intangibles Goodwill represents the excess of the cost of net assets acquired in business combinations over the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed in a business combination. We test goodwill and indefinite-lived intangibles for impairment at least annually in the fourth quarter, and more frequently whenever events or circumstances change that would more likely than not reduce the fair value below the carrying amount. Such events or changes in circumstance include significant deterioration in overall economic conditions, changes in the business climate in which our reporting units operate, a decline in our market capitalization, operating performance indicators, when some portion of a reporting unit is disposed of or classified as held for sale, or when a change in the composition of reporting units occurs for other reasons, such as a change in operating segments. To test goodwill and indefinite-lived intangible assets for impairment, we may perform both a qualitative assessment and quantitative assessment. If we elect to perform a qualitative assessment, we consider operating results as well as circumstances impacting the operations or cash flows of the reporting unit or indefinite-lived intangible assets, including macroeconomic conditions, industry and market conditions and reporting unit events and circumstances. For the quantitative test, the assessment is based on both an income-based and market-based valuation approach. If it is determined that an impairment exists, we recognize an impairment loss for the amount by which the carrying amount of the reporting unit or indefinite-lived intangible asset exceeds its estimated fair value. Fair value estimates are based on assumptions believed to be reasonable at the time, but such assumptions are subject to inherent uncertainty. Actual results may differ materially from those estimates. Any changes in key assumptions or management judgment with respect to a reporting unit or its prospects, which may result from a decline in Griffon’s stock price, a change in market conditions, market trends, interest rates or other factors outside of Griffon’s control, or significant underperformance relative to historical or projected future operating results, could result in a significantly different estimate of the fair value of Griffon’s reporting units, which could result in an impairment charge in the future.
Leases	Leases On October 1, 2019, the Company adopted the Accounting Standards Codifications ("ASC") Topic 842, Leases, which requires the recording of operating lease Right-of-Use ("ROU") assets and operating lease liabilities. Finance leases were not impacted by the adoption of ASC Topic 842, as finance lease liabilities and the corresponding assets were already recorded in the balance sheet under the previous guidance, ASC Topic 840. The Company has elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carry forward the historical lease classification. We also elected a practical expedient to determine the reasonably certain lease term. The Company applied the modified retrospective approach, whereby the cumulative effect of adoption is recognized as of the date of adoption and comparative prior periods are not retrospectively adjusted. As a result, upon adoption, we recognized ROU assets of $163,552 and lease liabilities of $163,676 associated with our operating leases. The standard had no material impact to retained earnings or on our Consolidated Statements of Income or Consolidated Statements of Cash Flows. ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. We use the implicit rate when readily determinable. For leases existing as of October 1, 2019, we have elected to use the remaining lease term as of the adoption date in determining the incremental borrowing rate. Our determination of the lease term may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. The Company determines if an arrangement is a lease at inception. The ROU assets and short and long-term liabilities associated with our operating leases are shown as separate line items on our Condensed Consolidated Balance Sheets. Finance leases are included in property, plant, and equipment, net, other accrued liabilities, and other non-current liabilities. For operating leases, fixed lease payments are recognized as operating lease cost on a straight-line basis over the lease term. For finance leases and impaired operating leases, the ROU asset is depreciated on a straight-line basis over the remaining lease term, along with recognition of interest expense associated with accretion of the lease liability. For leases with a lease term of 12 months or less (a "Short-term" lease), any fixed lease payments are recognized on a straight-line basis over such term, and are not recognized on the Condensed Consolidated Balance Sheets. Variable lease cost for both operating and finance leases, if any, is recognized as incurred. The Company has lease agreements that contain both lease and non-lease components. For real estate leases, we account for lease components together with non-lease components (e.g., common-area maintenance).
Definite-lived long-lived assets	Definite-lived long-lived assetsAmortizable intangible assets are carried at cost less accumulated amortization. For financial reporting purposes, definite-lived intangible assets are amortized on a straight-line basis over their useful lives, generally eight to twenty-five years. Long-lived assets and certain identifiable intangible assets to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition.
Income taxes	Income taxes We are subject to Federal, state and local income taxes in the U.S. and in various taxing jurisdictions outside the U.S. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns in accordance with applicable accounting guidance for accounting for income taxes, using currently enacted tax rates in effect for the year in which the differences are expected to reverse. We record a valuation allowance when necessary to reduce deferred tax assets to the amount expected to be realized. Deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Both positive and negative evidence are considered in forming our judgment as to whether a valuation allowance is appropriate, and more weight is given to evidence that can be objectively verified. Valuation allowances are reassessed whenever there are changes in circumstances that may cause a change in judgment. The accounting for uncertainty in income taxes requires a more-likely-than-not threshold for financial statement recognition of tax positions taken or expected to be taken in a tax return. We record, as needed, a liability for the difference between the benefit recognized for financial statement purposes and the tax position taken or expected to be taken on our tax return. To the extent that our assessment of such tax positions changes, the change in estimate is recorded in the period in which the determination is made.
Research and development costs, shipping and handling costs and advertising costs	Research and development costs, shipping and handling costs and advertising costs Research and development costs are charged to SG&A expense as incurred and amounted to approximately $16,000 in 2022, $7,000 in 2021 and $8,000 in 2020. Total shipping and handling costs were $130,830 in 2022, $113,700 in 2021 and $100,135 in 2020, of which $69,000 in 2022, $58,100 in 2021 and $54,500 in 2020 were included in SG&A. Advertising costs, which are expensed as incurred in SG&A, was $22,000 in 2022, $19,000 in 2021 and $18,000 in 2020.
Risk, retention and insurance	Risk, retention and insurance Griffon’s property and casualty insurance programs contain various deductibles that, based on Griffon’s experience, are reasonable and customary for a company of its size and risk profile. Griffon generally maintains deductibles for claims and liabilities related primarily to workers’ compensation, general, product and automobile liability as well as property damage and business interruption losses resulting from certain events. Griffon does not consider any of the deductibles to represent a material risk to Griffon. Griffon accrues for claim exposures that are probable of occurrence and can be reasonably estimated. Insurance is maintained to transfer risk beyond the level of self-retention and provides protection on both an individual claim and annual aggregate basis.
Pension benefits	Pension benefits Griffon sponsors defined and supplemental benefit pension plans for certain retired employees. Annual amounts relating to these plans are recorded based on actuarial projections, which include various actuarial assumptions, including discount rates, assumed rates of return, compensation increases and turnover rates. Actuarial assumptions used to determine pension liabilities, assets and expense are reviewed annually and modified based on current economic conditions and trends. The expected return on plan assets is determined based on the nature of the plan's investments and expectations for long-term rates of return. The discount rate used to measure obligations is based on a corporate bond spot-rate yield curve that matches projected future benefit payments, with the appropriate spot rate applicable to the timing of the projected future benefit payments. Assumptions used in determining Griffon’s obligations under the defined benefit pension plans are believed to be reasonable, based on experience and advice from independent actuaries; however, differences in actual experience or changes in assumptions may materially impact Griffon’s financial position or results of operations. All of the defined benefit plans are frozen and have ceased accruing benefits.
Issued but not yet effective accounting pronouncements and new accounting standards implemented	Issued but not yet effective accounting pronouncements In October 2021, the Financial Accounting Standards Board ("FASB") issued ASU No. 2021-08, Business Combinations (Topic 805); Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This new guidance affects all entities that enter into a business combination within the scope of ASC 805-10. Under this new guidance, the acquirer should determine what contract assets and/or liabilities it would have recorded under ASC 606 (Revenue Guidance) as of the acquisition date, as if the acquirer had entered into the original contract at the same date and on the same terms as the acquirer. Under current U.S. GAAP, contract assets and contract liabilities acquired in a business combination are recorded by the acquirer at fair value. This update is effective for the Company beginning in fiscal 2023. Early adoption is permitted. The Company is currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and related disclosures. New Accounting Standards Implemented In December 2019, the FASB issued guidance on simplifying the accounting for income taxes by clarifying and amending existing guidance related to the recognition of franchise tax, the evaluation of a step up in the tax basis of goodwill, and the effects of enacted changes in tax laws or rates in the effective tax rate computation, among other clarifications. This guidance became effective for the Company beginning in fiscal 2022. We adopted the recognition of non-income taxes on the modified retrospective basis. Adoption of this standard did not have a material impact on our consolidated financial statements and the related disclosures. In August 2018, the FASB issued guidance to clarify disclosure requirements related to defined benefit pension and other post-retirement plans. The guidance is effective for fiscal years beginning after December 15, 2020, with early adoption permitted, and was effective for the Company in our fiscal year beginning October 1, 2021. Adoption of this standard did not have a material impact on our consolidated financial statements and the related disclosures. The Company has implemented all new accounting pronouncements that are in effect and that may impact its financial statements, and does not believe that there are any other new accounting pronouncements that have been issued that might have a material impact on its financial position or results of operations.

DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

12 Months Ended

Sep. 30, 2022

The consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. The results of operations of acquired businesses are included from the dates of acquisitions.

Earnings per share

Due to rounding, the sum of earnings per share may not equal earnings per share of Net income.

Discontinued operations

Discontinued operationsFor the years ended September 30, 2022, 2021 and 2020, discontinued operations includes the Telephonics business, and the assets and liabilities of discontinued installations business and other discontinued activities which have been segregated from Griffon's continuing operations primarily related to insurance claims, product liability, warranty and environmental reserves.

Reclassifications

Certain amounts in prior years have been reclassified to conform to the current year presentation.

Use of estimates

Use of estimatesThe preparation of financial statements in conformity with accounting principles generally accepted in the United States 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 doubtful accounts receivable 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, assumption 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, assumptions associated with valuation of acquired assets and assumed liabilities of acquired companies 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.

Cash and equivalents

Griffon considers all highly liquid investments purchased with an initial maturity of three months or less to be cash equivalents. Cash equivalents primarily consist of overnight commercial paper, highly-rated liquid money market funds backed by U.S. Treasury securities and U.S. Agency securities, as well as insured bank deposits. Griffon had cash in non-U.S. bank accounts of approximately $54,200 and $65,000 at September 30, 2022 and 2021, respectively. Substantially all U.S. cash and equivalents are in excess of FDIC insured limits. Griffon regularly evaluates the financial stability of all institutions and funds that hold its cash and equivalents.

Fair value of financial instruments

The carrying values of cash and cash equivalents, accounts receivable, accounts and notes payable and revolving credit debt approximate fair value due to either the short-term nature of such instruments or the fact that the interest rate of the revolving credit debt is based upon current market rates.

The fair value hierarchy, as outlined in the applicable accounting guidance, establishes a fair value hierarchy that requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s categorization within the hierarchy is based on the lowest level of input that is significant to the fair value measurement. The accounting guidance establishes three levels of inputs that may be used to measure fair value, as follows:

•Level 1 inputs are measured and recorded at fair value based upon quoted prices in active markets for identical assets.

•Level 2 inputs include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in active markets for similar assets and liabilities, quoted prices for identical or similar assets or liabilities in markets

that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of assets or liabilities.

•Level 3 inputs are unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions.

The Company accounts for acquisitions under the acquisition method, in which assets acquired and liabilities assumed are recorded at fair value as of the date of acquisition using a method substantially similar to the goodwill impairment test methodology (level 3 inputs). The operating results of the acquired companies are included in Griffon’s consolidated financial statements from the date of acquisition in each instance.

Non-U.S. currency translation

Assets and liabilities of non-U.S. subsidiaries, where the functional currency is not the U.S. dollar, have been translated at year-end exchange rates and profit and loss accounts have been translated using weighted average exchange rates during the applicable fiscal year. Adjustments resulting from currency translation are recorded in AOCI as cumulative translation adjustments. The Company recognized cumulative translation losses of $37,920 during 2022 and gains of $6,433 during 2021. As of September 30, 2022 and 2021, the cumulative foreign currency translation recorded in AOCI was a loss of $57,170 and $19,250, respectively. Assets and liabilities of an entity that are denominated in currencies other than that entity’s functional currency are re-measured into the functional currency using period end exchange rates, or historical rates where applicable to certain balances. Gains and losses arising on remeasurements are recorded within the Consolidated Statement of Operations and Comprehensive Income as a component of Other income (expense).

Revenue recognition

The Company recognizes revenue when performance obligations identified under the terms of contracts with its customers are satisfied. A performance obligation is a promise in a contract to transfer a distinct good or service, or a bundle of goods or services, to the customer, and is the unit of accounting. A contract with a customer is an agreement which both parties have approved, that creates enforceable rights and obligations, has commercial substance and with respect to which payment terms are identified and collectability is probable. Once the Company has entered into a contract or purchase order, it is evaluated to identify performance obligations. For each performance obligation, revenue is recognized when control of the promised products is transferred to the customer, or services are satisfied under the contract or purchase order, in an amount that reflects the consideration the Company expects to be entitled to in exchange for those products or services (the transaction price).

The Company’s performance obligations are recognized at a point in time related to the manufacture and sale of a broad range of products and components, and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer, which is generally upon shipment.

A contract's transaction price is allocated to each distinct performance obligation and recognized as revenue when each performance obligation is satisfied. A majority of the Company’s contracts have a single performance obligation which represents, in most cases, the product being sold to the customer. To a lesser extent, some contracts include multiple performance obligations such as a product, the related installation, and extended warranty services. These contracts require judgment in determining the number of performance obligations. For contracts with multiple performance obligations, judgment is required to determine whether performance obligations specified in these contacts are distinct and should be accounted for as separate revenue transactions for recognition purposes. In these types of contracts, the Company allocates the total transaction price to each performance obligation in an amount based on the estimated relative standalone selling prices of the promised goods or services underlying each performance obligation. The Company uses an observable price to determine the stand-alone selling price for separate performance obligations or a cost plus margin approach when one is not available. The transaction price includes variable consideration, such as discounts and volume rebates, when it is probable that a significant reversal of revenue recognized will not occur. Variable consideration is determined using either the expected value or the most likely amount of consideration to be received based on historical experience and the specific facts and circumstances at the time of evaluation.

See Note 18 - Business Segments for revenue from contracts with customers disaggregated by end markets, segments and geographic location.

The Company’s performance obligations are recognized at a point in time related to the manufacture and sale of a broad range of products and components and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer, which is generally upon shipment.

A majority of the Company's revenue is short cycle in nature with shipments occurring within one year from order and does not include a material long-term financing component, implicitly or explicitly. Payment terms generally range between 15 to 90 days and vary by the location of the business, the type of products manufactured to be sold and the volume of products sold, among other factors.

The Company recognizes revenue from product sales when all factors are met, including when control of a product transfers to the customer upon its shipment, completion of installation, testing, certification or other substantive acceptance required under the contract. Other than standard product warranty provisions, sales arrangements provide for no other significant post-shipment obligations on the Company. From time-to-time and for certain customers, rebates and other sales incentives, promotional allowances or discounts are offered, typically related to customer purchase volumes, all of which are fixed or determinable and are classified as a reduction of revenue and recorded at the time of sale. Griffon provides for sales returns and allowances based upon historical returns experience. The Company includes shipping costs billed to customers in revenue and the related shipping costs in either Cost of Goods and Services or Selling, General and Administrative expenses.

The majority of the Company’s contracts offer assurance-type warranties in connection with the sale of a product to a customer. Assurance-type warranties provide a customer with assurance that the related product will function as the parties intended because it complies with agreed-upon specifications. Such warranties do not represent a separate performance obligation.

Payment terms vary depending on the type and location of the customer and the products or services offered. Generally, the period between the time revenue is recognized and the time payment is due is not significant. Shipping and handling charges

are not considered a separate performance obligation. Additionally, all taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction and collected from a customer (e.g., sales, use, value added, and some excise taxes) are excluded from revenue.

Accounts receivable, allowance for doubtful accounts and concentrations of credit risk

Accounts receivable, expected loss allowance for doubtful accounts and concentrations of credit risk

Accounts receivable is composed principally of trade accounts receivable, that arise from the sale of goods or services on account, and is stated at historical cost. A substantial portion of Griffon’s trade receivables are from Home Depot, whose financial condition is dependent on the construction and related retail sectors of the economy. As a percentage of consolidated accounts receivable, Home Depot was 17%. Griffon performs continuing evaluations of the financial condition of its customers, and although Griffon generally does not require collateral, letters of credit may be required from customers in certain circumstances.

Trade receivables are recorded at the stated amount, less expected loss allowance for doubtful accounts and, when appropriate, for customer program reserves and cash discounts. The expected loss allowance represents estimated uncollectible receivables associated with potential customer defaults on contractual obligations (usually due to customers’ potential insolvency). The expected loss allowance for doubtful accounts includes amounts for certain customers where a risk of default has been specifically identified, as well as an amount for customer defaults based on a formula when it is determined the risk of some default is probable and estimable, but cannot yet be associated with specific customers. The provision related to the expected loss allowance for doubtful accounts is recorded in Selling, general and administrative ("SG&A") expenses. The Company writes-off accounts receivable when they are deemed to be uncollectible.

Customer program reserves and cash discounts are netted against accounts receivable when it is customer practice to reduce invoices for these amounts. The amounts netted against accounts receivable in 2022 and 2021 were $69,656 and $49,833, respectively.

All accounts receivable amounts are expected to be collected in less than one year.

The Company does not currently have customers or contracts that prescribe specific retainage provisions.

Inventories

Inventories, stated at the lower of cost (first-in, first-out or average) or net realizable value, include material, labor and manufacturing overhead costs.

Griffon’s businesses typically do not require inventory that is susceptible to becoming obsolete or dated. In general, HBP produces residential and commercial sectional garage doors, commercial rolling steel door and grille products, and CPP produces long-handled tools and landscaping products, and storage and organizational products, both in response to orders from customers of retailers and dealers or based on expected orders, as applicable.

Long-Lived Assets

Long-Lived Assets, Including Intangible Assets

Property, plant and equipment includes the historical cost of land, buildings, equipment and significant improvements to existing plant and equipment or, in the case of acquisitions, a fair market value appraisal of such assets completed at the time of acquisition. Expenditures for maintenance, repairs and minor renewals are expensed as incurred. When property or equipment is sold or otherwise disposed of, the related cost and accumulated depreciation is removed from the respective accounts and the gain or loss is recognized.

Depreciation expense, which includes amortization of assets under capital leases, was $46,443, $42,741 and $42,614 in 2022, 2021 and 2020, respectively, and was calculated on a straight-line basis over the estimated useful lives of the assets. Depreciation included in SG&A expenses was $16,683, $14,362 and $13,944 in 2022, 2021 and 2020, respectively. The remaining components of depreciation, attributable to manufacturing operations, are included in Cost of goods and services. Estimated useful lives for property, plant and equipment are as follows: buildings and building improvements, 25 to 40 years; machinery and equipment, 2 to 15 years; and leasehold improvements, over the term of the lease or life of the improvement, whichever is shorter.

Intangible Assets

Long-lived assets, including customer relationships and software, and tangible assets, primarily property, plant and equipment, are amortized over their expected useful lives, which involve significant assumptions and estimates. We assess the recoverability of the carrying amount of our long-lived assets, including amortizable intangible assets, whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable. We evaluate the recoverability of such assets based on the expectations of undiscounted cash flows attributable to the asset group. If the sum of the expected future undiscounted cash flows are less than the carrying amount of the asset group, a loss would be recognized for the difference between the fair value and the carrying amount. For the fiscal year ended September 30, 2022, we tested long-lived intangible and tangible assets for impairment by comparing estimated future undiscounted cash flows of each CPP asset group to the carrying amount of the asset group and determined that an impairment did not exist. No event or indicator of impairment existed for the HBP assets groups.

Goodwill and indefinite-lived intangibles

Goodwill represents the excess of the cost of net assets acquired in business combinations over the fair value of the identifiable tangible and intangible assets acquired and liabilities assumed in a business combination.

We test goodwill and indefinite-lived intangibles for impairment at least annually in the fourth quarter, and more frequently whenever events or circumstances change that would more likely than not reduce the fair value below the carrying amount. Such events or changes in circumstance include significant deterioration in overall economic conditions, changes in the business climate in which our reporting units operate, a decline in our market capitalization, operating performance indicators, when some portion of a reporting unit is disposed of or classified as held for sale, or when a change in the composition of reporting units occurs for other reasons, such as a change in operating segments. To test goodwill and indefinite-lived intangible assets for impairment, we may perform both a qualitative assessment and quantitative assessment. If we elect to perform a

qualitative assessment, we consider operating results as well as circumstances impacting the operations or cash flows of the reporting unit or indefinite-lived intangible assets, including macroeconomic conditions, industry and market conditions and reporting unit events and circumstances. For the quantitative test, the assessment is based on both an income-based and market-based valuation approach. If it is determined that an impairment exists, we recognize an impairment loss for the amount by which the carrying amount of the reporting unit or indefinite-lived intangible asset exceeds its estimated fair value.

Fair value estimates are based on assumptions believed to be reasonable at the time, but such assumptions are subject to inherent uncertainty. Actual results may differ materially from those estimates. Any changes in key assumptions or management judgment with respect to a reporting unit or its prospects, which may result from a decline in Griffon’s stock price, a change in market conditions, market trends, interest rates or other factors outside of Griffon’s control, or significant underperformance relative to historical or projected future operating results, could result in a significantly different estimate of the fair value of Griffon’s reporting units, which could result in an impairment charge in the future.

Leases

On October 1, 2019, the Company adopted the Accounting Standards Codifications ("ASC") Topic 842, Leases, which requires the recording of operating lease Right-of-Use ("ROU") assets and operating lease liabilities. Finance leases were not impacted by the adoption of ASC Topic 842, as finance lease liabilities and the corresponding assets were already recorded in the balance sheet under the previous guidance, ASC Topic 840. The Company has elected the package of practical expedients permitted under the transition guidance within the new standard, which among other things, allows us to carry forward the historical lease classification. We also elected a practical expedient to determine the reasonably certain lease term.

The Company applied the modified retrospective approach, whereby the cumulative effect of adoption is recognized as of the date of adoption and comparative prior periods are not retrospectively adjusted. As a result, upon adoption, we recognized ROU assets of $163,552 and lease liabilities of $163,676 associated with our operating leases. The standard had no material impact to retained earnings or on our Consolidated Statements of Income or Consolidated Statements of Cash Flows.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. We use the implicit rate when readily determinable. For leases existing as of October 1, 2019, we have elected to use the remaining lease term as of the adoption date in determining the incremental borrowing rate. Our determination of the lease term may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.

The Company determines if an arrangement is a lease at inception. The ROU assets and short and long-term liabilities associated with our operating leases are shown as separate line items on our Condensed Consolidated Balance Sheets. Finance leases are included in property, plant, and equipment, net, other accrued liabilities, and other non-current liabilities.

For operating leases, fixed lease payments are recognized as operating lease cost on a straight-line basis over the lease term. For finance leases and impaired operating leases, the ROU asset is depreciated on a straight-line basis over the remaining lease term, along with recognition of interest expense associated with accretion of the lease liability. For leases with a lease term of 12 months or less (a "Short-term" lease), any fixed lease payments are recognized on a straight-line basis over such term, and are not recognized on the Condensed Consolidated Balance Sheets. Variable lease cost for both operating and finance leases, if any, is recognized as incurred. The Company has lease agreements that contain both lease and non-lease components. For real estate leases, we account for lease components together with non-lease components (e.g., common-area maintenance).

Definite-lived long-lived assets

Definite-lived long-lived assetsAmortizable intangible assets are carried at cost less accumulated amortization. For financial reporting purposes, definite-lived intangible assets are amortized on a straight-line basis over their useful lives, generally eight to twenty-five years. Long-lived assets and certain identifiable intangible assets to be held and used are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Determination of recoverability is based on an estimate of undiscounted future cash flows resulting from the use of the asset and its eventual disposition.

Income taxes

We are subject to Federal, state and local income taxes in the U.S. and in various taxing jurisdictions outside the U.S. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements or tax returns in accordance with applicable accounting guidance for accounting for income taxes, using currently enacted tax rates in effect for the year in which the differences are expected to reverse.

We record a valuation allowance when necessary to reduce deferred tax assets to the amount expected to be realized. Deferred tax assets are reduced by a valuation allowance if, based on the weight of available evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. Both positive and negative evidence are considered in forming our judgment as to whether a valuation allowance is appropriate, and more weight is given to evidence that can be objectively verified. Valuation allowances are reassessed whenever there are changes in circumstances that may cause a change in judgment.

The accounting for uncertainty in income taxes requires a more-likely-than-not threshold for financial statement recognition of tax positions taken or expected to be taken in a tax return. We record, as needed, a liability for the difference between the benefit recognized for financial statement purposes and the tax position taken or expected to be taken on our tax return. To the extent that our assessment of such tax positions changes, the change in estimate is recorded in the period in which the determination is made.

Research and development costs, shipping and handling costs and advertising costs

Research and development costs are charged to SG&A expense as incurred and amounted to approximately $16,000 in 2022, $7,000 in 2021 and $8,000 in 2020.

Total shipping and handling costs were $130,830 in 2022, $113,700 in 2021 and $100,135 in 2020, of which $69,000 in 2022, $58,100 in 2021 and $54,500 in 2020 were included in SG&A. Advertising costs, which are expensed as incurred in SG&A, was $22,000 in 2022, $19,000 in 2021 and $18,000 in 2020.

Risk, retention and insurance

Griffon’s property and casualty insurance programs contain various deductibles that, based on Griffon’s experience, are reasonable and customary for a company of its size and risk profile. Griffon generally maintains deductibles for claims and liabilities related primarily to workers’ compensation, general, product and automobile liability as well as property damage and business interruption losses resulting from certain events. Griffon does not consider any of the deductibles to represent a material risk to Griffon. Griffon accrues for claim exposures that are probable of occurrence and can be reasonably estimated. Insurance is maintained to transfer risk beyond the level of self-retention and provides protection on both an individual claim and annual aggregate basis.

Pension benefits

Griffon sponsors defined and supplemental benefit pension plans for certain retired employees. Annual amounts relating to these plans are recorded based on actuarial projections, which include various actuarial assumptions, including discount rates, assumed rates of return, compensation increases and turnover rates. Actuarial assumptions used to determine pension liabilities, assets and expense are reviewed annually and modified based on current economic conditions and trends. The expected return on plan assets is determined based on the nature of the plan's investments and expectations for long-term rates of return. The discount rate used to measure obligations is based on a corporate bond spot-rate yield curve that matches projected future benefit payments, with the appropriate spot rate applicable to the timing of the projected future benefit payments. Assumptions used in determining Griffon’s obligations under the defined benefit pension plans are believed to be reasonable, based on experience and advice from independent actuaries; however, differences in actual experience or changes in assumptions may materially impact Griffon’s financial position or results of operations.

All of the defined benefit plans are frozen and have ceased accruing benefits.

Issued but not yet effective accounting pronouncements and new accounting standards implemented

Issued but not yet effective accounting pronouncements

In October 2021, the Financial Accounting Standards Board ("FASB") issued ASU No. 2021-08, Business Combinations (Topic 805); Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. This new guidance affects all entities that enter into a business combination within the scope of ASC 805-10. Under this new guidance, the acquirer should determine what contract assets and/or liabilities it would have recorded under ASC 606 (Revenue Guidance) as of the acquisition date, as if the acquirer had entered into the original contract at the same date and on the same terms as the acquirer. Under current U.S. GAAP, contract assets and contract liabilities acquired in a business combination are recorded by the acquirer at fair value. This update is effective for the Company beginning in fiscal 2023. Early adoption is permitted. The Company is currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and related disclosures.

New Accounting Standards Implemented

In December 2019, the FASB issued guidance on simplifying the accounting for income taxes by clarifying and amending existing guidance related to the recognition of franchise tax, the evaluation of a step up in the tax basis of goodwill, and the effects of enacted changes in tax laws or rates in the effective tax rate computation, among other clarifications. This guidance became effective for the Company beginning in fiscal 2022. We adopted the recognition of non-income taxes on the modified retrospective basis. Adoption of this standard did not have a material impact on our consolidated financial statements and the related disclosures.

In August 2018, the FASB issued guidance to clarify disclosure requirements related to defined benefit pension and other post-retirement plans. The guidance is effective for fiscal years beginning after December 15, 2020, with early adoption permitted, and was effective for the Company in our fiscal year beginning October 1, 2021. Adoption of this standard did not have a material impact on our consolidated financial statements and the related disclosures.

The Company has implemented all new accounting pronouncements that are in effect and that may impact its financial statements, and does not believe that there are any other new accounting pronouncements that have been issued that might have a material impact on its financial position or results of operations.