Griffon (GFF) 10-Q 29 Apr 20 2020 Q2 Quarterly report Financial data

Cover Page

Cover Page	6 Months Ended
	Mar. 31, 2020shares
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	1-06620
Entity Registrant Name	GRIFFON CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	11-1893410
Entity Address, Address Line One	712 Fifth Ave, 18th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10019
City Area Code	212
Local Phone Number	957-5000
Title of 12(b) Security	Common Stock, $0.25 par value
Trading Symbol	GFF
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding	47,431,131
Current Fiscal Year End Date	--09-30
Amendment Flag	false
Entity Central Index Key	0000050725
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
CURRENT ASSETS
Cash and equivalents	$ 69,024	$ 72,377
Accounts receivable, net of allowances of $12,681 and $7,881	335,033	264,450
Contract costs and recognized income not yet billed, net of progress payments of $22,294 and $13,861	94,495	105,111
Inventories	462,119	442,121
Prepaid and other current assets	42,723	40,799
Assets of discontinued operations	321	321
Total Current Assets	1,003,715	925,179
PROPERTY, PLANT AND EQUIPMENT, net	335,820	337,326
OPERATING LEASE RIGHT-OF-USE ASSETS	156,258
GOODWILL	436,782	437,067
INTANGIBLE ASSETS, net	353,743	356,639
OTHER ASSETS	29,556	15,840
ASSETS OF DISCONTINUED OPERATIONS	2,873	2,888
Total Assets	2,318,747	2,074,939
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	9,470	10,525
Accounts payable	228,674	250,576
Accrued liabilities	118,479	124,665
Current portion of operating lease liabilities	28,047
Liabilities of discontinued operations	2,450	4,333
Total Current Liabilities	387,120	390,099
LONG-TERM DEBT, net	1,216,226	1,093,749
LONG-TERM OPERATING LEASE LIABILITIES	133,498
OTHER LIABILITIES	102,295	109,997
LIABILITIES OF DISCONTINUED OPERATIONS	3,154	3,331
Total Liabilities	1,842,293	1,597,176
COMMITMENTS AND CONTINGENCIES - See Note 21
SHAREHOLDERS’ EQUITY
Total Shareholders’ Equity	476,454	477,763
Total Liabilities and Shareholders’ Equity	$ 2,318,747	$ 2,074,939

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Statement of Financial Position [Abstract]
Accounts receivable, net allowances	$ 12,681	$ 7,881
Contract costs, net of progress payments	$ 22,294	$ 13,861

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	COMMON STOCK	CAPITAL IN EXCESS OF PAR VALUE	RETAINED EARNINGS	TREASURY SHARES	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	DEFERRED COMPENSATION
Balance (in shares) at Sep. 30, 2018		81,520			35,846
Balance at Sep. 30, 2018	$ 474,391	$ 20,380	$ 503,396	$ 550,523	$ (534,830)	$ (34,112)	$ (30,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	8,753			8,753
Dividend	(3,143)			(3,143)
Shares withheld on employee taxes on vested equity awards (in shares)					83
Shares withheld on employee taxes on vested equity awards	(1,058)				$ (1,058)
Amortization of deferred compensation	856						856
Common stock acquired (in shares)					29
Common stock acquired	(290)				$ (290)
Equity awards granted, net (in shares)		1,201
Equity awards granted, net	0	$ 300	(300)
ESOP allocation of common stock	(8)		(8)
Stock-based compensation	2,933		2,933
Stock-based consideration	250		250
Other comprehensive income, net of tax	(5,450)					(5,450)
Balance (in shares) at Dec. 31, 2018		82,721			35,958
Balance at Dec. 31, 2018	471,561	$ 20,680	506,271	550,460	$ (536,178)	(39,562)	(30,110)
Balance (in shares) at Sep. 30, 2018		81,520			35,846
Balance at Sep. 30, 2018	474,391	$ 20,380	503,396	550,523	$ (534,830)	(34,112)	(30,966)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,597
Other comprehensive income, net of tax	(2,570)
Balance (in shares) at Mar. 31, 2019		82,769			35,969
Balance at Mar. 31, 2019	474,284	$ 20,692	510,585	545,600	$ (536,308)	(36,682)	(29,603)
Balance (in shares) at Dec. 31, 2018		82,721			35,958
Balance at Dec. 31, 2018	471,561	$ 20,680	506,271	550,460	$ (536,178)	(39,562)	(30,110)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(1,156)			(1,156)
Dividend	(3,704)			(3,704)
Shares withheld on employee taxes on vested equity awards (in shares)					3
Shares withheld on employee taxes on vested equity awards	(48)				$ (48)
Amortization of deferred compensation	507						507
Common stock acquired (in shares)					8
Common stock acquired	(82)				$ (82)
Equity awards granted, net (in shares)		48
Equity awards granted, net	0	$ 12	(12)
ESOP allocation of common stock	601		601
Stock-based compensation	3,422		3,422
Stock-based consideration	303		303
Other comprehensive income, net of tax	2,880					2,880
Balance (in shares) at Mar. 31, 2019		82,769			35,969
Balance at Mar. 31, 2019	474,284	$ 20,692	510,585	545,600	$ (536,308)	(36,682)	(29,603)
Balance (in shares) at Sep. 30, 2019		82,775			35,969
Balance at Sep. 30, 2019	477,763	$ 20,694	519,017	568,516	$ (536,308)	(65,916)	(28,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,612			10,612
Dividend	(3,392)			(3,392)
Shares withheld on employee taxes on vested equity awards (in shares)					80
Shares withheld on employee taxes on vested equity awards	(1,758)				$ (1,758)
Amortization of deferred compensation	629						629
Equity awards granted, net (in shares)		182
Equity awards granted, net	0	$ 45	(45)
ESOP allocation of common stock	609		609
Stock-based compensation	3,150		3,150
Stock-based consideration	239		239
Other comprehensive income, net of tax	6,841					6,841
Balance (in shares) at Dec. 31, 2019		82,957			36,049
Balance at Dec. 31, 2019	494,693	$ 20,739	522,970	575,736	$ (538,066)	(59,075)	(27,611)
Balance (in shares) at Sep. 30, 2019		82,775			35,969
Balance at Sep. 30, 2019	477,763	$ 20,694	519,017	568,516	$ (536,308)	(65,916)	(28,240)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	11,507
Other comprehensive income, net of tax	(7,993)
Balance (in shares) at Mar. 31, 2020		83,741			36,310
Balance at Mar. 31, 2020	476,454	$ 20,935	526,988	573,209	$ (543,787)	(73,909)	(26,982)
Balance (in shares) at Dec. 31, 2019		82,957			36,049
Balance at Dec. 31, 2019	494,693	$ 20,739	522,970	575,736	$ (538,066)	(59,075)	(27,611)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	895			895
Dividend	(3,422)			(3,422)
Shares withheld on employee taxes on vested equity awards (in shares)					261
Shares withheld on employee taxes on vested equity awards	(5,721)				$ (5,721)
Amortization of deferred compensation	629						629
Equity awards granted, net (in shares)		784
Equity awards granted, net	0	$ 196	(196)
ESOP allocation of common stock	435		435
Stock-based compensation	3,662		3,662
Stock-based consideration	117		117
Other comprehensive income, net of tax	(14,834)					(14,834)
Balance (in shares) at Mar. 31, 2020		83,741			36,310
Balance at Mar. 31, 2020	$ 476,454	$ 20,935	$ 526,988	$ 573,209	$ (543,787)	$ (73,909)	$ (26,982)

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 566,350	$ 549,633	$ 1,114,788	$ 1,060,155
Cost of goods and services	414,318	412,129	812,835	779,605
Gross profit	152,032	137,504	301,953	280,550
Selling, general and administrative expenses	126,467	111,783	244,265	225,537
Income from operations	25,565	25,721	57,688	55,013
Other income (expense)
Interest expense	(16,871)	(17,517)	(33,082)	(34,046)
Interest income	310	212	571	410
Loss from debt extinguishment, net	(6,690)	0	(6,690)	0
Other, net	615	1,268	1,393	2,272
Total other expense, net	(22,636)	(16,037)	(37,808)	(31,364)
Income before taxes from continuing operations	2,929	9,684	19,880	23,649
Provision from income taxes	2,034	3,194	8,373	8,406
Income from continuing operations	895	6,490	11,507	15,243
Discontinued operations:
Loss from operations of discontinued operations	0	(11,000)	0	(11,000)
Benefit for income taxes	0	(3,354)	0	(3,354)
Loss from discontinued operations	0	(7,646)	0	(7,646)
Net income (loss)	$ 895	$ (1,156)	$ 11,507	$ 7,597
Income (loss) from continuing operations (in dollars per share)	$ 0.02	$ 0.16	$ 0.28	$ 0.37
Income (loss) from discontinued operations (in dollars per share)	0	(0.19)	0	(0.19)
Basic earnings per common share (in dollars per share)	$ 0.02	$ (0.03)	$ 0.28	$ 0.19
Basic weighted-average shares outstanding (in shares)	41,565	40,949	41,369	40,849
Income from continuing operations (in dollars per share)	$ 0.02	$ 0.15	$ 0.26	$ 0.36
Income (loss) from discontinued operations (in dollars per share)	0	(0.18)	0	(0.18)
Diluted earnings per common share (in dollars per share)	$ 0.02	$ (0.03)	$ 0.26	$ 0.18
Diluted weighted-average shares outstanding (in shares)	43,734	42,832	43,826	42,376
Dividends paid per common share (in dollars per share)	$ 0.0750	$ 0.0725	$ 0.1500	$ 0.1450
Net income (loss)	$ 895	$ (1,156)	$ 11,507	$ 7,597
Other comprehensive income (loss), net of taxes:
Foreign currency translation adjustments	(16,471)	2,885	(10,001)	(2,851)
Pension and other post retirement plans	669	184	1,341	368
Change in cash flow hedges	968	(189)	667	(87)
Total other comprehensive income (loss), net of taxes	(14,834)	2,880	(7,993)	(2,570)
Comprehensive income (loss), net	$ (13,939)	$ 1,724	$ 3,514	$ 5,027

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 11,507	$ 7,597
Net loss from discontinued operations	0	7,646
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	31,544	30,577
Stock-based compensation	8,302	7,500
Asset impairment charges - restructuring	4,388	0
Provision for losses on accounts receivable	596	316
Amortization of debt discounts and issuance costs	2,267	2,841
Loss from debt extinguishment, net	6,690	0
Deferred income taxes	408	(865)
Gain on sale of assets and investments	(274)	(137)
Non-cash lease expense	18,739	0
Change in assets and liabilities, net of assets and liabilities acquired:
Increase in accounts receivable and contract costs and recognized income not yet billed	(61,815)	(47,669)
Increase in inventories	(20,958)	(37,852)
(Increase) decrease in prepaid and other assets	(6,005)	2,323
Decrease in accounts payable, accrued liabilities, income taxes payable and operating lease liabilities	(56,792)	(28,945)
Other changes, net	560	1,662
Net cash used in operating activities	(60,843)	(55,006)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(22,519)	(17,418)
Acquired businesses, net of cash acquired	(10,531)	(9,219)
Insurance payments	0	(10,604)
Proceeds from sale of assets	290	62
Investment purchase	0	(149)
Net cash used in investing activities	(32,760)	(37,328)
CASH FLOWS FROM FINANCING ACTIVITIES:
Dividends paid	(7,349)	(6,847)
Purchase of shares for treasury	(7,479)	(1,478)
Proceeds from long-term debt	1,061,343	143,101
Payments of long-term debt	(939,071)	(48,169)
Financing costs	(13,176)	(945)
Contingent consideration for acquired businesses	0	(1,686)
Other, net	83	83
Net cash provided by financing activities	94,351	84,059
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash used in operating activities	(1,994)	(3,438)
Net cash used in investing activities	0	0
Net cash used in financing activities	0	0
Net cash used in discontinued operations	(1,994)	(3,438)
Effect of exchange rate changes on cash and equivalents	(2,107)	(66)
NET DECREASE IN CASH AND EQUIVALENTS	(3,353)	(11,779)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD	72,377	69,758
CASH AND EQUIVALENTS AT END OF PERIOD	$ 69,024	$ 57,979

DESCRIPTION OF BUSINESS AND BAS

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION	6 Months Ended
	Mar. 31, 2020
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 diversified management and holding company that conducts business through wholly-owned subsidiaries. Griffon oversees the operations of its subsidiaries, allocates resources among them and manages their capital structures. Griffon provides direction and assistance to its subsidiaries in connection with acquisition and growth opportunities as well as in connection with divestitures. In order to further diversify, Griffon also seeks out, evaluates and, when appropriate, will acquire additional businesses that offer potentially attractive returns on capital. The Company was founded in 1959, is a Delaware corporation headquartered in New York, N.Y. and is listed on the New York Stock Exchange (NYSE:GFF). Griffon currently conducts its operations through three reportable segments: • Consumer and Professional Products ("CPP") conducts its operations through The AMES Companies, Inc. ("AMES"). Founded in 1774, AMES is the leading North American manufacturer and a global provider of branded consumer and professional tools and products for home storage and organization, landscaping, and enhancing outdoor lifestyles. CPP sells products globally through a portfolio of leading brands including True Temper, AMES, and ClosetMaid. • Home and Building Products ("HBP") conducts its operations through Clopay Corporation ("Clopay"). Founded in 1964, Clopay is the largest manufacturer and marketer of garage doors and rolling steel doors in North America. Residential and commercial sectional garage doors are sold through professional dealers and leading home center retail chains throughout North America under the brands Clopay, Ideal, and Holmes. Rolling steel door and grille products designed for commercial, industrial, institutional, and retail use are sold under the CornellCookson brand. • Defense Electronics ("DE") conducts its operations through Telephonics Corporation ("Telephonics"), founded in 1933, a globally recognized leading provider of highly sophisticated intelligence, surveillance and communications solutions for defense, aerospace and commercial customers. In March 2020, the World Health Organization declared the outbreak of COVID-19 a pandemic, which continues to spread throughout the U.S. and the world. The impact from the rapidly changing U.S. and global market and economic conditions due to the COVID-19 outbreak is uncertain, with disruptions to the business of our customers and suppliers, which in turn is likely to impact our business and consolidated results of operations and financial condition in the future. While we have not incurred significant disruptions to our manufacturing or to our supply chain thus far from the COVID-19 outbreak, we are unable to accurately predict the impact COVID-19 will have due to numerous uncertainties, including the severity of the disease, the duration of the outbreak, actions that may be taken by governmental authorities, the impact to our customers’ and suppliers’ businesses and other factors identified in Part II, Item 1A “Risk Factors” in this Form 10-Q. We will continue to evaluate the nature and extent of the impact to our business, consolidated results of operations, and financial condition. 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 year ended September 30, 2019 , 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 CPP operations 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, 2019 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2019 . The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. 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 allowances for doubtful accounts receivable and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, percentage of completion method of accounting, pension assumptions, useful lives associated with depreciation and amortization of fixed and intangible assets, warranty reserves, sales incentive accruals, stock based compensation assumptions, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves and the valuation of assets and liabilities of discontinued operations, acquisition assumptions used 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. Certain amounts in the prior year have been reclassified to conform to current year presentation.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	6 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The carrying values of cash and equivalents, accounts receivable, accounts and notes payable, and revolving credit and variable interest rate 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 and variable rate debt is based upon current market rates. Applicable accounting guidance establishes a fair value hierarchy requiring 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 fair values of Griffon’s 2022 and 2028 senior notes approximated $139,500 and $799,000 , respectively, on March 31, 2020 . Fair values were based upon quoted market prices (level 1 inputs). Insurance contracts with values of $3,382 at March 31, 2020 are measured and recorded at fair value based upon quoted prices in active markets for similar assets (level 2 inputs) and are included in Prepaid and other current assets on the Consolidated Balance Sheets. Items Measured at Fair Value on a Recurring Basis At March 31, 2020 , trading securities, measured at fair value based on quoted prices in active markets for similar assets (level 2 inputs), with a fair value of $2,605 ( $2,236 cost basis), were included in Prepaid and other current assets on the Consolidated Balance Sheets. Realized and unrealized gains and losses on trading securities are included in Other income in the Consolidated Statements of Operations and Comprehensive Income (Loss). In the normal course of business, Griffon’s operations are exposed to the effects of changes in foreign currency exchange rates. To manage these risks, Griffon may enter into various derivative contracts such as foreign currency exchange contracts, including forwards and options. As of March 31, 2020 , Griffon entered into several such contracts in order to lock into a foreign currency rate for planned settlements of trade and inter-company liabilities payable in US dollars. At March 31, 2020 , Griffon had $8,000 of Australian dollar contracts at a weighted average rate of $1.63 which qualified for hedge accounting (level 2 inputs). These hedges were all deemed effective as cash flow hedges with gains and losses related to changes in fair value deferred and recorded in Accumulated other comprehensive income (loss) ("AOCI") and Prepaid and other current assets, or Accrued liabilities, until settlement. Upon settlement, gains and losses are recognized in the Consolidated Statements of Operations and Comprehensive Income (Loss) in Cost of goods and services ("COGS"). AOCI included deferred gains of $849 ( $552 , net of tax) at March 31, 2020 and gains of $1,050 and $994 were recorded in COGS during the three and six months ended March 31, 2020 , respectively, for all settled contracts. All contracts expire in 30 to 90 days. At March 31, 2020 , Griffon had $3,300 and $4,350 of Canadian and British Pound dollar contracts, respectively, at a weighted average rate of $1.41 and $0.81 respectively. The contracts, which protect Canadian and United Kingdom operations from currency fluctuations for US dollar based purchases, do not qualify for hedge accounting. For the three and six months ended March 31, 2020 , fair value gains of $ $271 and $199 were recorded to Other assets and to Other income for the outstanding contracts, based on similar contract values (level 2 inputs). Realized gains of $84 and $87 were recorded in Other income during the three and six months ended March 31, 2020 , respectively, for all settled contracts. All contracts expire in 30 to 180

REVENUE

REVENUE	6 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE 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. 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 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. Over 80% of the Company’s performance obligations are recognized at a point in time that relates to the manufacture and sale of a broad range of products and components within the CPP and HBP segments, and revenue is recognized when title, and risk and rewards of ownership, have transferred to the customer. A majority of CPP and HBP segment 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. Less than 20% of the Company’s performance obligations are recognized over time or under the percentage-of-completion method; these relate to prime or subcontractors from contract awards with the U.S. Government, as well as foreign governments and other commercial customers within our DE segment. These contracts are typically long-term in nature, usually greater than one year and do not include a material long-term financing component, either implicitly or explicitly. Revenue and profits from such contracts are recognized under the percentage-of-completion (over time) method of accounting. Revenue and profits on fixed-price contracts that contain engineering as well as production requirements are recorded based on the ratio of total actual incurred costs to date to the total estimated costs for each contract (cost-to-cost method). Sales recognized over time are generally accounted for using an input measure to determine progress completed at the end of the period. Adjustments to estimates for a contract's estimated costs at completion and estimated profit or loss are often required as experience is gained, more information is obtained (even though the scope of work required under the contract may or may not change) and contract modifications occur. The impact of such adjustments to estimates is made on a cumulative basis in the period when such information has become known. For the three and six months ended March 31, 2020 , income from operations included net unfavorable catch up adjustments approximating $2,224 and $5,243 , respectively. Gross profit is impacted by a variety of factors, including the mix of products, systems and services, production efficiencies, price competition and general economic conditions. We believe that cumulative costs incurred to date as a percentage of estimated total contract costs at completion is an appropriate measure of progress towards satisfaction of performance obligations, as it most accurately depicts the progress of our work and transfer of control to our customers. For contracts in which anticipated total costs exceed the total expected revenue, an estimated loss is recognized in the period when identifiable. A provision for the entire amount of the estimated loss is recorded on a cumulative basis, and is recorded as a reduction to gross margin on the Consolidated Statements of Operations and Comprehensive Income (Loss). The provision had an immaterial impact on Griffon's Consolidated Financial Statements. The estimated remaining costs to complete loss contracts as of March 31, 2020 and September 30, 2019 were approximately $8,560 and $9,790 , respectively. For a complete explanation of Griffon’s revenue accounting policies, this note should be read in conjunction with Griffon’s Annual Report on Form 10-K for the year ended September 30, 2019 . See Note 12 - Business Segments for revenue from contracts with customers disaggregated by end markets, segments and geographic location. Transaction Price Allocated to the Remaining Performance Obligations On March 31, 2020 , we had $331,740 of remaining performance obligations, which we also refer to as total backlog. We expect to recognize approximately 73% of our remaining performance obligations as revenue within one year, with the balance to be completed thereafter. Backlog represents the dollar value of funded orders for which work has not been performed. Backlog generally increases with bookings, and converts into revenue as we incur costs related to contractual commitments or the shipment of product. Given the nature of our business and a larger dependency on international customers, our bookings, and therefore our backlog, is impacted by the longer maturation cycles resulting in delays in the timing and amounts of such awards, which are subject to numerous factors, including fiscal constraints placed on customer budgets; political uncertainty; the timing of customer negotiations; and the timing of governmental approvals. Contract Balances Contract assets were $94,495 as of March 31, 2020 compared to $105,111 as of September 30, 2019. The $10,616 decrease in our contract assets balance was primarily due to the timing of billings and work performed on various radar and surveillance programs. Contract assets primarily relate to the Company's right to consideration for work completed but not billed at the reporting date and are recorded in Contract costs and recognized income not yet billed, net of progress payments in the Consolidated Balance Sheets. Contract assets are transferred to receivables when the right to consideration becomes unconditional. Contract costs and recognized income not yet billed consists of amounts accounted for under the percentage of completion method of accounting, recoverable costs and accrued profit that cannot yet be invoiced under the terms of certain long-term contracts. Amounts will be invoiced when applicable contract terms, such as the achievement of specified milestones or product delivery, are met. At March 31, 2020 and September 30, 2019, approximately $12,612 and $13,100 , respectively, of contract costs and recognized income not yet billed were expected to be collected after one year. As of March 31, 2020 , Contract costs and recognized income not yet billed included approximately $1,570 of reserves for contract risk. As of September 30, 2019, Contract costs and recognized income not yet billed included no reserves for contract risk. Contract liabilities were $21,292 as of March 31, 2020 compared to $26,259 as of September 30, 2019. The $4,967

ACQUISITIONS

ACQUISITIONS	6 Months Ended
	Mar. 31, 2020
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Griffon 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, Griffon is in the process of finalizing the initial purchase price allocation unless otherwise noted. On November 29, 2019, AMES acquired 100% of the outstanding stock of Vatre Group Limited ("Apta"), a leading United Kingdom supplier of innovative garden pottery and associated products sold to leading UK and Ireland garden centers for approximately $10,500 (GBP 8,750 ), inclusive of a post-closing working capital adjustment, net of cash acquired. This acquisition broadens AMES' product offerings in the UK market and increases its in-country operational footprint. The purchase price was primarily allocated to goodwill of GBP 2,418 , acquired intangible assets of GBP 3,454 , inventory of GBP 2,914 , accounts receivable and other assets of GBP 2,492 and accounts payable and other accrued liabilities of GBP 2,734 . During both the three and six months ended March 31, 2020 , the Company incurred acquisition costs of $2,960 . The Company did no t incur acquisition costs in the three and six months ended March 31, 2019.

INVENTORIES

INVENTORIES	6 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost (first-in, first-out or average) or market. The following table details the components of inventory: At March 31, 2020 At September 30, 2019 Raw materials and supplies $ 122,576 $ 121,791 Work in process 99,730 93,830 Finished goods 239,813 226,500 Total $ 462,119 $ 442,121

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	6 Months Ended
	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT The following table details the components of property, plant and equipment, net: At March 31, 2020 At September 30, 2019 Land, building and building improvements $ 156,393 $ 133,036 Machinery and equipment 577,573 580,698 Leasehold improvements 51,012 49,808 784,978 763,542 Accumulated depreciation and amortization (449,158 ) (426,216 ) Total $ 335,820 $ 337,326 Depreciation and amortization expense for property, plant and equipment was $13,316 and $12,980 for the quarters ended March 31, 2020 and 2019 , respectively, and $26,748 and $25,647 for the six months ended March 31, 2020 and 2019, respectively. Depreciation included in SG&A expenses was $4,910 and $4,761 for the quarters ended March 31, 2020 and 2019, respectively, and $9,861 and $9,442 for the six months ended March 31, 2020 and 2019, respectively. Remaining components of depreciation, attributable to manufacturing operations, are included in Cost of goods and services. Except as described in Note 16, Restructuring Charges, no event or indicator of impairment occurred during the six months ended March 31, 2020

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES	6 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLES	GOODWILL AND OTHER INTANGIBLES The following table provides changes in the carrying value of goodwill by segment during the six months ended March 31, 2020 : At September 30, 2019 Goodwill from acquisitions Other At March 31, 2020 Consumer and Professional Products $ 227,269 $ 3,125 $ (3,410 ) $ 226,984 Home and Building Products 191,253 — — 191,253 Defense Electronics 18,545 — — 18,545 Total $ 437,067 $ 3,125 $ (3,410 ) $ 436,782 The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets: At March 31, 2020 At September 30, 2019 Gross Carrying Amount Accumulated Amortization Average Life (Years) Gross Carrying Amount Accumulated Amortization Customer relationships & other $ 182,035 $ 60,935 23 $ 183,515 $ 57,783 Technology and patents 19,076 7,715 13 19,167 7,329 Total amortizable intangible assets 201,111 68,650 202,682 65,112 Trademarks 221,282 — 219,069 — Total intangible assets $ 422,393 $ 68,650 $ 421,751 $ 65,112 Amortization expense for intangible assets was $2,403 and $2,512 for the quarters ended March 31, 2020 and 2019, respectively, and $4,796 and $4,930 for the six months ended March 31, 2020 and 2019. Amortization expense for the remainder of 2020 and the next five fiscal years and thereafter, based on current intangible balances and classifications, is estimated as follows: 2020 - $4,797 ; 2021 - $9,387 ; 2022 - $9,387 ; 2023 - $9,234 ; 2024 - $9,208 ; 2025 - $9,208 ; thereafter $81,240 . Griffon performs its annual goodwill impairment testing in the fourth quarter of each year. The 2019 impairment testing resulted in all three reporting units having fair values substantially in excess of their carrying values. In addition to the annual impairment test, the Company is required to regularly assess whether a triggering event has occurred which would require interim impairment testing. Given the general deterioration in economic and market conditions surrounding the COVID-19 pandemic, the Company considered the impact that the COVID-19 pandemic may have on its near and long-term forecasts and completed an interim impairment test. The company determined that there is no impairment to either its goodwill or indefinite-lived intangible assets at March 31, 2020 .

INCOME TAXES

INCOME TAXES	6 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES During the quarter ended March 31, 2020 , the Company recognized a tax provision of $2,034 on income before taxes from continuing operations of $2,929 , compared to a tax provision of $3,194 on income before taxes from continuing operations of $9,684 in the comparable prior year quarter. The current year quarter included restructuring charges of $3,104 ( $3,005 , net of tax), acquisition costs of $2,960 ( $2,321 , net of tax), loss from debt extinguishment of $6,690 ( $5,245 , net of tax) and net discrete tax and certain other tax benefits, net of $1,413 , that affect comparability. The prior year quarter included net discrete tax and certain other tax benefits of $97 that affect comparability. Excluding these items, the effective tax rates for the quarters ended March 31, 2020 and 2019 were 35.9% and 34.0% , respectively. During the six months ended March 31, 2020 , the Company recognized a tax provision of $8,373 on Income before taxes from continuing operations of $19,880 , compared to a tax provision of $8,406 on Income before taxes from continuing operations of $23,649 in the comparable prior year period. The six month period ended March 31, 2020 included restructuring charges of $9,538 ( $7,153 , net of tax), acquisition costs of $2,960 ( $2,321 , net of tax), loss from debt extinguishment of $6,690 ( $5,245 , net of tax) and net discrete tax benefits of $580 . The six month period ended March 31, 2019 included net discrete tax provisions of $370 . Excluding these items, the effective tax rates for the six months ended March 31, 2020 and 2019 were 34.4% and 34.0% , respectively. In response to the COVID-19 outbreak, legislation concerning taxes was passed in March 2020. While we are still assessing the impact of the legislation, we do not expect there to be a material impact to our consolidated financial statements at this time.

LONG-TERM DEBT

LONG-TERM DEBT	6 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT At March 31, 2020 At September 30, 2019 Outstanding Balance Original Issuer Premium Capitalized Fees & Expenses Balance Sheet Coupon Interest Rate Outstanding Balance Original Issuer Premium Capitalized Fees & Expenses Balance Sheet Coupon Interest Rate Senior notes due 2028 (a) $ 850,000 $ — (12,854 ) $ 837,146 5.75 % $ — $ — $ — $ — — % Senior notes due 2022 (a) 150,000 104 (1,098 ) 149,006 5.25 % 1,000,000 867 (9,175 ) 991,692 5.25 % Revolver due 2025 (b) 183,548 — (2,678 ) 180,870 Variable 50,000 — (1,243 ) 48,757 Variable Capital lease - real estate (d) 12,406 — (42 ) 12,364 5.00 % 4,388 — (55 ) 4,333 5.00 % Non US lines of credit (e) 9,532 — (97 ) 9,435 Variable 17,576 — (45 ) 17,531 Variable Non US term loans (e) 33,462 — (122 ) 33,340 Variable 36,977 — (188 ) 36,789 Variable Other long term debt (f) 3,552 — (17 ) 3,535 Variable 5,190 — (18 ) 5,172 Variable Totals 1,242,500 104 (16,908 ) 1,225,696 1,114,131 867 (10,724 ) 1,104,274 less: Current portion (9,470 ) — — (9,470 ) (10,525 ) — — (10,525 ) Long-term debt $ 1,233,030 $ 104 $ (16,908 ) $ 1,216,226 $ 1,103,606 $ 867 $ (10,724 ) $ 1,093,749 Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Debt Issuance Costs Total Interest Expense Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Total Interest Expense Senior notes due 2028 (a) 6.0 % $ 5,566 $ — $ 135 $ 5,701 n/a $ — $ — $ — $ — Senior notes due 2022 (a) 5.7 % 8,040 45 628 8,713 5.7 % 13,125 66 951 14,142 Revolver due 2025 (b) Variable 1,819 — 165 1,984 Variable 1,631 — 400 2,031 ESOP Loans (c) n/a — — — — 7.2 % 449 — 155 604 Capital lease - real estate (d) 6.1 % 52 — 7 59 5.6 % 101 — 6 107 Non US lines of credit (e) Variable 3 — 8 11 Variable 4 — 4 8 Non US term loans (e) Variable 292 — 7 299 Variable 449 — 26 475 Other long term debt (f) Variable 132 — — 132 Variable 147 — 3 150 Capitalized interest (28 ) — — (28 ) — — — — Totals $ 15,876 $ 45 $ 950 $ 16,871 $ 15,906 $ 66 $ 1,545 $ 17,517 (1) n/a = not applicable Six Months Ended March 31, 2020 Six Months Ended March 31, 2019 Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Debt Issuance Costs Total Interest Expense Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Total Interest Expense Senior notes due 2028 (a) 6.0 % $ 5,566 $ — $ 135 $ 5,701 — % $ — $ — $ — $ — Senior notes due 2022 (a) 5.6 % 21,165 112 1,579 22,856 5.7 % 26,250 134 1,902 28,286 Revolver due 2021 (b) Variable 3,201 — 397 3,598 Variable 2,564 — 541 3,105 ESOP Loans (c) n/a — — — — 6.6 % 937 — 186 1,123 Capital lease - real estate (d) 6.0 % 113 — 13 126 5.5 % 216 — 12 228 Non US lines of credit (e) Variable 7 — 12 19 Variable 11 — 8 19 Non US term loans (e) Variable 564 — 19 583 Variable 897 — 53 950 Other long term debt (f) Variable 292 — — 292 Variable 329 — 6 335 Capitalized interest (93 ) — — (93 ) — — — — Totals $ 30,815 $ 112 $ 2,155 $ 33,082 $ 31,204 $ 134 $ 2,708 $ 34,046 (a) On February 19, 2020, in an unregistered offering through a private placement under Rule 144A and Regulation S, Griffon issued, at par, $850,000 of 5.75% Senior Notes due 2028 (the “2028 Senior Notes”). Proceeds from the 2028 Senior Notes were used to redeem 85% of the $1,000,000 of 5.25% Senior Notes due 2022 (the “2022 Senior Notes" and, collectively with the 2028 Senior Notes, the "Senior Notes"). Following the sale and issuance of the 2028 Notes transaction, $150,000 aggregate principal amount of the 2022 Notes remained outstanding. As of March 31, 2020 , outstanding Senior Notes due totaled $1,000,000 ; interest is payable semi-annually on March 1 and September 1. The Senior Notes are senior unsecured obligations of Griffon guaranteed by certain domestic subsidiaries, and subject to certain covenants, limitations and restrictions. On April 22, 2020, Griffon exchanged substantially all of the 2028 Senior Notes for substantially identical 2028 Senior Notes registered under the Securities Act of 1933 (the "Securities Act") via an exchange offer. The remaining 2022 Senior Notes outstanding are registered under the Securities Act, having been issued pursuant to similar prior exchange offers. The fair value of the 2022 and 2028 Senior Notes approximated $139,500 and $799,000 , respectively, on March 31, 2020 based upon quoted market prices (level 1 inputs). In connection with these transactions, Griffon capitalized $12,989 of underwriting fees and other expenses incurred related to the issuance and exchange of the 2028 Senior Notes. Furthermore, 85% of the obligations associated with the 2022 Senior Notes were discharged leaving remaining fees of $1,145 . At March 31, 2020 , a combined total amount of $13,952 remained to be amortized. Remaining capitalized fees for the 2022 Senior Notes and all capitalized fees for the 2028 Senior Notes will amortize over the term of each respective note. Additionally, Griffon recognized a $6,690 loss on the early extinguishment of debt on 85% of the 5.25% $1,000,000 senior notes due 2022, comprised primarily of the write-off of $5,873 of remaining deferred financing fees, $607 of tender offer net premium expense and $210 of redemption interest expense. (b) On January 30, 2020, Griffon amended its revolving credit facility (as amended, the "Credit Agreement") to increase the maximum borrowing availability from $350,000 to $400,000 and extend its maturity date from March 22, 2021 to March 22, 2025, except that if the 2022 Senior Notes are not repaid, refinanced or replaced prior to December 1, 2021, then the Credit Agreement will mature on December 1, 2021. The amended agreement also modified certain other provisions of the facility. The facility includes a letter of credit sub-facility with a limit of $100,000 (increased from $50,000 ); a multi-currency sub-facility of $200,000 (increased from $100,000 ); and contains a customary accordion feature that permits us to request, subject to each lender's consent, an increase in the maximum aggregate amount that can be borrowed by up to an additional $100,000 (increased from $50,000 ). Borrowings under the Credit Agreement may be repaid and re-borrowed at any time. Interest is payable on borrowings at either a LIBOR or base rate benchmark rate, plus an applicable margin, which adjusts based on financial performance. Current margins are 1.00% for base rate loans and 2.00% for LIBOR loans. The Credit Agreement has certain financial maintenance tests including a maximum total leverage ratio, a maximum senior secured leverage ratio and a minimum interest coverage ratio, as well as customary affirmative and negative covenants, and events of default. The negative covenants place limits on Griffon's ability to, among other things, incur indebtedness, incur liens, and make restricted payments and investments. Borrowings under the Credit Agreement are guaranteed by Griffon’s material domestic subsidiaries and are secured, on a first priority basis, by substantially all domestic assets of the Company and the guarantors, and a pledge of not greater than 65% of the equity interest in Griffon’s material, first-tier foreign subsidiaries. At March 31, 2020 , there were $183,548 of outstanding borrowings under the Credit Agreement; outstanding standby letters of credit were $21,390 ; and $195,062 was available, subject to certain loan covenants, for borrowing at that date. (c) In August 2016 and as amended on June 30, 2017, Griffon’s ESOP entered into a Term Loan with a bank (the "ESOP Agreement"). The Term Loan interest rate was LIBOR plus 3.00% . The Term Loan required quarterly principal payments of $569 with a balloon payment due at maturity. The Term Loan was secured by shares purchased with the proceeds of the loan and with a lien on a specific amount of Griffon assets (which ranked pari passu with the lien granted on such assets under the Credit Agreement) and was guaranteed by Griffon. On March 13, 2019, the ESOP Term Loan was refinanced with an internal loan from Griffon which was funded with cash and a draw under its Credit Agreement. The internal loan interest rate is fixed at 2.91% , matures in June 2033 and requires quarterly payments of principal, currently $635 , and interest. The internal loan is secured by shares purchased with the proceeds of the loan. The amount outstanding on the internal loan at March 31, 2020 was $31,148 . (d) Two Griffon subsidiaries have finance leases outstanding for real estate located in Troy, Ohio and Ocala, Florida. The leases mature in 2021 and 2025 , respectively, and bear interest at fixed rates of approximately 5.0% and 2.9% , respectively. The Troy, Ohio lease is secured by a mortgage on the real estate and is guaranteed by Griffon. The Ocala, Florida lease contains one five -year renewal option. At March 31, 2020 , $12,364 was outstanding, net of issuance costs. (e) In November 2012, Garant G.P. (“Garant”) entered into a CAD 15,000 ( $10,628 as of March 31, 2020 ) revolving credit facility. The facility accrues interest at LIBOR (USD) or the Bankers Acceptance Rate (CDN) plus 1.3% per annum ( 2.29% LIBOR USD and 2.30% Bankers Acceptance Rate CDN as of March 31, 2020 ). The revolving facility matures in October 2022. Garant is required to maintain a certain minimum equity. At March 31, 2020 , there were no borrowings under the revolving credit facility with CAD 15,000 ( $10,628 as of March 31, 2020 ) available for borrowing. In July 2016 and as amended in March 2019, Griffon Australia Holdings Pty Ltd and its Australian subsidiaries (collectively, "Griffon Australia") entered into an AUD 29,625 term loan, AUD 20,000 revolver and AUD 10,000 receivable purchase facility agreement. The term loan requires quarterly principal payments of AUD 1,250 plus interest with a balloon payment of AUD 13,375 due upon maturity in March 2022, and accrues interest at Bank Bill Swap Bid Rate “BBSY” plus 1.90% per annum ( 2.39% at March 31, 2020 ). As of March 31, 2020 , the term loan had an outstanding balance of AUD 23,375 ( $14,378 as of March 31, 2020 ). The revolving facility and receivable purchase facility mature in March 2022, but are renewable upon mutual agreement with the lender. The revolving facility and receivable purchase facility accrue interest at BBSY plus 1.8% and 1.25% , respectively, per annum ( 2.20% and 1.65% , respectively, at March 31, 2020 ). At March 31, 2020 , there were no borrowings under the revolver and the receivable purchase facilities had an outstanding balance of AUD 10,000 ( $6,151 as of March 31, 2020 ). The revolver, receivable purchase facility and the term loan are all secured by substantially all of the assets of Griffon Australia and its subsidiaries. Griffon Australia is required to maintain a certain minimum equity level and is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. In July 2018, the AMES Companies UK Ltd and its subsidiaries (collectively, "AMES UK") entered into a GBP 14,000 term loan, GBP 4,000 mortgage loan and GBP 5,000 revolver. The term loan and mortgage loan require quarterly principal payments of GBP 350 and GBP 83 plus interest, respectively, and have balloon payments due upon maturity, July 2023, of GBP 7,000 and GBP 2,333 , respectively. The Term Loan and Mortgage Loans accrue interest at the GBP LIBOR Rate plus 2.25% and 1.8% , respectively ( 2.49% and 2.04% at March 31, 2020 , respectively). The revolving facility matures in June 2020, but is renewable upon mutual agreement with the lender, and accrues interest at the Bank of England Base Rate plus 1.5% ( 1.60% as of March 31, 2020 ). As of March 31, 2020 , the revolver had an outstanding balance of GBP 2,728 ( $3,381 as of March 31, 2020 ) while the term and mortgage loan balances amounted to GBP 15,398 ( $19,084 as of March 31, 2020). The revolver and the term loan are both secured by substantially all of the assets of AMES UK and its subsidiaries. AMES UK is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. An invoice discounting arrangement was canceled and replaced by the above loan facilities. (f) Other long-term debt primarily consists of a loan with the Pennsylvania Industrial Development Authority, with the balance consisting of capital leases. At March 31, 2020 , Griffon and its subsidiaries were in compliance with the terms and covenants of all credit and loan agreements.

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	6 Months Ended
	Mar. 31, 2020
Stockholders' Equity Note [Abstract]
SHAREHOLDERS' EQUITY	SHAREHOLDERS’ EQUITY During the second quarter of 2020, the Company paid a quarterly cash dividend of $0.075 per share in each quarter, totaling $0.15 per share for the six months ended March 31, 2020. During 2019, the Company paid a quarterly cash dividend of $0.0725 per share, totaling $0.29 per share for the year. A dividend payable was established for the holders of restricted shares; such dividends will be released upon vesting of the underlying restricted shares. In March 2019, the ESOP Term Loan was refinanced with a loan from Griffon which was funded with cash and a draw on its credit facility; dividends paid on allocated shares in the ESOP are allocated to participant accounts in the form of additional shares. On April 27, 2020, the Board of Directors declared a quarterly cash dividend of $0.075 per share, payable on June 18, 2020 to shareholders of record as of the close of business on May 21, 2020. Compensation expense for restricted stock and restricted stock units is recognized ratably over the required service period based on the fair value of the grant, calculated as the number of shares granted multiplied by the stock price on the date of grant and, for performance shares, the likelihood of achieving the performance criteria. Compensation expense for restricted stock granted to two senior executives is calculated as the maximum number of shares granted, upon achieving certain performance criteria, multiplied by the stock price as valued by a Monte Carlo Simulation Model. Compensation cost related to stock-based awards with graded vesting, generally over a period of three to four years, is recognized using the straight-line attribution method and recorded within SG&A expenses. On January 29, 2016, shareholders approved the Griffon Corporation 2016 Equity Incentive Plan ("Incentive Plan") under which awards of performance shares, performance units, stock options, stock appreciation rights, restricted shares, restricted stock units, deferred shares and other stock-based awards may be granted. On January 31, 2018, shareholders approved Amendment No. 1 to the Incentive Plan pursuant to which, among other things, 1,000,000 shares were added to the Incentive Plan; and on January 30, 2020, shareholders approved Amendment No. 2 to the Incentive Plan, pursuant to which 1,700,000 shares were added to the Incentive Plan. Options granted under the Incentive Plan may be either “incentive stock options” or nonqualified stock options, generally expire ten years after the date of grant and are granted at an exercise price of not less than 100% of the fair market value at the date of grant. The maximum number of shares of common stock available for award under the Incentive Plan is 5,050,000 ( 600,000 of which may be issued as incentive stock options), plus (i) any shares reserved for issuance under the 2011 Equity Incentive Plan as of the effective date of the Incentive Plan, and (ii) any shares underlying awards outstanding on such effective date under the 2011 Incentive Plan that are canceled or forfeited. As of March 31, 2020 , there were 1,057,505 shares available for grant. All grants outstanding under former equity plans will continue under their terms; no additional awards will be granted under such plans. During the first quarter of 2020, Griffon granted 216,523 shares of restricted stock and restricted stock units, subject to certain performance conditions, with vesting periods of three years , with a total fair value of $4,705 , or a weighted average fair value of $21.73 per share. During the second quarter of 2020, Griffon granted 804,674 shares of restricted stock. This included 99,772 shares of restricted stock to seven executives, subject to certain performance conditions, with vesting period of 34 months , with a total fair value of $2,200 , or weighted average fair value of $22.05 per share. Griffon also granted 44,902 restricted shares to the non-employee directors of Griffon with a vesting period of three years and a fair value of $990 , or a weighted average fair value of $22.05 per share. This also included 660,000 shares of restricted stock granted to two senior executives with a vesting period of four years and a two year post-vesting holding period, subject to the achievement of certain absolute and relative performance conditions relating to the price of Griffon's common stock. So long as the minimum performance condition is attained, the amount of shares that can vest will range from 480,000 to 660,000 . The total fair value of these restricted shares using the Monte Carlo Simulation model is approximately $9,534 , or a weighted average fair value of $14.45 per share. The following table summarizes the Company’s compensation expense relating to all stock-based incentive plans: For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Restricted stock $ 3,662 $ 3,422 $ 6,812 $ 6,355 ESOP 658 492 1,490 1,145 Total stock based compensation $ 4,320 $ 3,914 $ 8,302 $ 7,500 On each of August 3, 2016 and August 1, 2018, Griffon’s Board of Directors authorized the repurchase of up to $50,000 of Griffon’s outstanding common stock. Under this share repurchase program, the Company may purchase shares in the open market, including pursuant to a 10b5-1 plan, or in privately negotiated transactions. During the quarter and six months ended March 31, 2020 , Griffon did not purchase any shares of common stock under these repurchase programs. As of March 31, 2020 , an aggregate of $57,955 remains under Griffon's Board authorized repurchase programs. During the quarter and six months ended March 31, 2020 , 261,223 shares, with a market value of $5,721 , or $21.90 per share, and 340,775 shares, with a market value of $7,409 , or $21.74 per share, respectively, were withheld to settle employee taxes due upon the vesting of restricted stock, and were added to treasury stock. Furthermore, during the six months ended March 31, 2020 , an additional 3,307 shares, with a market value of $70 , or $21.22

EARNINGS PER SHARE (EPS)

EARNINGS PER SHARE (EPS)	6 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
EARNINGS PER SHARE (EPS)	EARNINGS PER SHARE (EPS) Basic EPS (and diluted EPS in periods when a loss exists) was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding during the period. Diluted EPS was calculated by dividing income available to common shareholders by the weighted average number of shares of common stock outstanding plus additional common shares that could be issued in connection with stock based compensation. The following table is a reconciliation of the share amounts (in thousands) used in computing earnings per share: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Common shares outstanding 47,431 46,800 47,431 46,800 Unallocated ESOP shares (2,159 ) (2,409 ) (2,159 ) (2,409 ) Non-vested restricted stock (3,562 ) (3,427 ) (3,562 ) (3,427 ) Impact on weighted average shares (145 ) (15 ) (341 ) (115 ) Weighted average shares outstanding - basic 41,565 40,949 41,369 40,849 Incremental shares from stock based compensation 2,169 1,883 2,457 1,527 Weighted average shares outstanding - diluted 43,734 42,832 43,826 42,376

BUSINESS SEGMENTS

BUSINESS SEGMENTS	6 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
BUSINESS SEGMENTS	BUSINESS SEGMENTS In fiscal 2019, Griffon modified its reportable segment structure to provide investors with improved visibility after a series of portfolio repositioning actions which included the divestiture of the Plastics business, the acquisition of ClosetMaid and its subsequent integration into AMES, and the acquisition of CornellCookson by Clopay. The prior year amounts have been recast to reflect the recent change in Griffon's reporting segment structure. Griffon now reports its operations through three reportable segments from continuing operations, as follows: • CPP conducts its operations through AMES. Founded in 1774, AMES is the leading North American manufacturer and a global provider of branded consumer and professional tools and products for home storage and organization, landscaping, and enhancing outdoor lifestyles. CPP sells products globally through a portfolio of leading brands including True Temper, AMES, and ClosetMaid. • HBP conducts its operations through Clopay. Founded in 1964, Clopay is the largest manufacturer and marketer of garage doors and rolling steel doors in North America. Residential and commercial sectional garage doors are sold through professional dealers and leading home center retail chains throughout North America under the brands Clopay, Ideal, and Holmes. Rolling steel door and grille products designed for commercial, industrial, institutional, and retail use are sold under the CornellCookson brand. • DE conducts its operations through Telephonics, founded in 1933, a globally recognized leading provider of highly sophisticated intelligence, surveillance and communications solutions for defense, aerospace and commercial customers. Information on Griffon’s reportable segments from continuing operations is as follows: For the Three Months Ended March 31, For the Six Months Ended March 31, REVENUE 2020 2019 2020 2019 Consumer and Professional Products $ 274,912 $ 287,732 $ 515,988 $ 504,206 Home and Building Products 209,829 186,799 451,210 410,094 Defense Electronics 81,609 75,102 147,590 145,855 Total consolidated net sales $ 566,350 $ 549,633 $ 1,114,788 $ 1,060,155 Disaggregation of Revenue Revenue from contracts with customers is disaggregated by end markets, segments and geographic location, as it more accurately depicts the nature and amount of the Company’s revenue. The following table presents revenue disaggregated by end market and segment: For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Residential repair and remodel $ 40,505 $ 38,441 $ 75,595 $ 65,599 Retail 144,904 162,576 264,524 275,941 Residential new construction 14,884 13,545 29,857 27,817 Industrial 10,535 11,416 21,158 21,174 International excluding North America 64,084 61,754 124,854 113,675 Total Consumer and Professional Products 274,912 287,732 515,988 504,206 Residential repair and remodel 100,808 90,271 222,805 203,638 Commercial construction 86,300 76,181 178,187 160,557 Residential new construction 22,721 20,347 50,218 45,899 Total Home and Building Products 209,829 186,799 451,210 410,094 U.S. Government 53,623 46,376 96,324 91,936 International 25,021 23,129 43,554 45,228 Commercial 2,965 5,597 7,712 8,691 Total Defense Electronics 81,609 75,102 147,590 145,855 Total Consolidated Revenue $ 566,350 $ 549,633 $ 1,114,788 $ 1,060,155 The following table presents revenue disaggregated by geography based on the location of the Company's customer: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 REVENUE BY GEOGRAPHIC AREA - DESTINATION CPP HBP Defense Electronics Total CPP HBP Defense Electronics Total United States $ 191,412 $ 199,060 $ 55,071 $ 445,543 $ 351,570 $ 426,010 $ 101,214 $ 878,794 Europe 24,737 5 9,880 34,622 31,342 28 15,865 47,235 Canada 17,515 7,867 4,209 29,591 35,296 19,120 6,783 61,199 Australia 39,032 — 189 39,221 93,260 — 795 94,055 All other countries 2,216 2,897 12,260 17,373 4,520 6,052 22,933 33,505 Consolidated revenue $ 274,912 $ 209,829 $ 81,609 $ 566,350 $ 515,988 $ 451,210 $ 147,590 $ 1,114,788 For the Three Months Ended March 31, 2019 For the Six Months Ended March 31, 2019 REVENUE BY GEOGRAPHIC AREA - DESTINATION CPP HBP Defense Electronics Total CPP HBP Defense Electronics Total United States $ 204,445 $ 175,945 $ 51,179 $ 431,569 $ 347,361 $ 385,772 $ 99,474 $ 832,607 Europe 20,343 29 8,490 28,862 28,208 46 18,801 47,055 Canada 18,845 6,984 3,058 28,887 38,210 17,965 5,687 61,862 Australia 41,749 266 979 42,994 85,788 450 1,588 87,826 All other countries 2,350 3,575 11,396 17,321 4,639 5,861 20,305 30,805 Consolidated revenue $ 287,732 $ 186,799 $ 75,102 $ 549,633 $ 504,206 $ 410,094 $ 145,855 $ 1,060,155 Griffon evaluates performance and allocates resources based on each segment's operating results before interest income and expense, income taxes, depreciation and amortization, unallocated amounts (mainly corporate overhead), restructuring charges, loss from debt extinguishment and acquisition related expenses, as well as other items that may affect comparability, as applicable (“Segment adjusted EBITDA”). Griffon believes this information is useful to investors for the same reason. The following table provides a reconciliation of Segment adjusted EBITDA to Income before taxes from continuing operations: For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Segment adjusted EBITDA: Consumer and Professional Products $ 25,027 $ 28,616 $ 46,953 $ 49,181 Home and Building Products 30,635 20,137 71,336 51,432 Defense Electronics 4,248 4,936 8,723 9,721 Segment adjusted EBITDA 59,910 53,689 127,012 110,334 Unallocated amounts, excluding depreciation (11,947 ) (11,208 ) (23,889 ) (22,472 ) Adjusted EBITDA 47,963 42,481 103,123 87,862 Net interest expense (16,561 ) (17,305 ) (32,511 ) (33,636 ) Depreciation and amortization (15,719 ) (15,492 ) (31,544 ) (30,577 ) Loss from debt extinguishment (6,690 ) — (6,690 ) — Restructuring charges (3,104 ) — (9,538 ) — Acquisition costs (2,960 ) — (2,960 ) — Income before taxes from continuing operations $ 2,929 $ 9,684 $ 19,880 $ 23,649 Unallocated amounts typically include general corporate expenses not attributable to a reportable segment. For the Three Months Ended March 31, For the Six Months Ended March 31, DEPRECIATION and AMORTIZATION 2020 2019 2020 2019 Segment: Consumer and Professional Products $ 8,222 $ 8,184 $ 16,453 $ 15,990 Home and Building Products 4,668 4,548 9,468 9,057 Defense Electronics 2,676 2,621 5,320 5,257 Total segment depreciation and amortization 15,566 15,353 31,241 30,304 Corporate 153 139 303 273 Total consolidated depreciation and amortization $ 15,719 $ 15,492 $ 31,544 $ 30,577 CAPITAL EXPENDITURES Segment: Consumer and Professional Products $ 3,800 $ 3,806 $ 7,532 $ 8,140 Home and Building Products 3,556 2,524 11,495 5,335 Defense Electronics 1,921 2,499 3,210 3,733 Total segment 9,277 8,829 22,237 17,208 Corporate 70 192 282 210 Total consolidated capital expenditures $ 9,347 $ 9,021 $ 22,519 $ 17,418 ASSETS At March 31, 2020 At September 30, 2019 Segment assets: Consumer and Professional Products $ 1,279,376 $ 1,070,510 Home and Building Products 592,011 571,216 Defense Electronics 348,081 347,575 Total segment assets 2,219,468 1,989,301 Corporate 96,085 82,429 Total continuing assets 2,315,553 2,071,730 Assets of discontinued operations 3,194 3,209 Consolidated total $ 2,318,747 $ 2,074,939

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	6 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
EMPLOYEE BENEFIT PLANS	EMPLOYEE BENEFIT PLANS Defined benefit pension expense (income) included in Other Income (Expense), net was as follows: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Interest cost $ 1,151 $ 1,571 $ 2,302 $ 3,141 Expected return on plan assets (2,586 ) (2,583 ) (5,172 ) (5,166 ) Amortization: Prior service cost 4 3 8 7 Recognized actuarial loss 1,042 222 2,084 444 Net periodic expense (income) $ (389 ) $ (787 ) $ (778 ) $ (1,574 )

RECENT ACCOUNTING PRONOUNCEMENT

RECENT ACCOUNTING PRONOUNCEMENTS	6 Months Ended
	Mar. 31, 2020
Accounting Changes and Error Corrections [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In February 2016, the FASB issued guidance on lease accounting requiring lessees to recognize a right-of-use asset and a lease liability for long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. During 2019, the Company developed a project plan to guide the implementation of this guidance. The Company completed this plan including surveying the Company’s businesses, assessing the Company’s portfolio of leases and compiling a central repository of active leases. The Company also implemented a lease accounting software solution to support the new reporting requirements and established a future lease process to keep the lease accounting portfolio up to date. The Company evaluated key policy elections and considerations under the standard and completed an internal policy as well as training to address the new standard requirements. The Company has elected the package of practical expedients and will not apply the recognition requirements to short-term leases. The Company adopted the requirements of the new standard as of October 1, 2019 and 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 have recognized right-of-use 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 Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. In May 2017, the FASB issued guidance to address the situation when a company modifies the terms of a stock compensation award previously granted to an employee. This guidance is effective, and should be applied prospectively, for fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period. The new guidance was effective for the Company beginning in fiscal 2019; however, the Company adopted this guidance as of October 1, 2018 and it did not have a material impact on the Company's financial condition, results of operations and related disclosures. In March 2017, the FASB issued amendments to the Compensation - Retirement Benefits guidance which requires companies to retrospectively present the service cost component of net periodic benefit cost for pension and retiree medical plans along with other compensation costs in operating income and present the other components of net periodic benefit cost below operating income in the income statement. The guidance also allows only the service cost component of net periodic benefit cost to be eligible for capitalization within inventory or fixed assets on a prospective basis. This guidance was effective for fiscal years beginning after December 15, 2017. The Company adopted the requirements of the standard as of October 1, 2018 on a retrospective basis reclassifying the other components of the net periodic benefit costs from Selling, general and administrative expenses to a non-service expense within Other (income) expense, net. This guidance did not have a material impact on the Company's results of operations. See Note 11 - Employee Benefit Plans for further information on the implementation of this guidance. In January 2017, the FASB issued guidance that simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those periods and is effective for the Company beginning October 1, 2020. The Company does not expect this guidance to have a material impact on the Company's financial condition, results of operations or related disclosures. In August 2016, the FASB issued guidance on the Statement of Cash Flows Classification of certain cash receipts and cash payments (a consensus of the FASB Emerging Issues Task Force). This guidance addresses the following eight specific cash flow issues: Debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. This guidance was effective for the Company beginning in fiscal 2019. The Company adopted the requirements of the standard in the first quarter of 2019 and it did not have a material impact on the Company's financial condition, results of operations and cash flows. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) which supersedes nearly all existing revenue recognition guidance. Subsequent to the issuance of Topic 606, the FASB clarified the guidance through several ASUs; hereinafter the collection of revenue guidance is referred to as “ASC 606”. The core principle of ASC 606 is that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. On October 1, 2018, the Company adopted ASC 606 using the modified retrospective method for all contracts. Results for reporting periods beginning October 1, 2018 are presented under ASC 606, while prior period amounts were not adjusted and continue to be reported in accordance with the Company’s historic accounting under Topic 605, Revenue Recognition. Under the modified retrospective method, the Company recognized the cumulative effect of initially applying this accounting standard as an adjustment to the opening balance in retained earnings of approximately $5,673 as of October 1, 2018. The impact to beginning retained earnings primarily related to certain contracts in the Defense Electronics Segment containing provisions for radar and communication products that have an alternative use and/or no right to payment. The adoption of ASC 606 did not have a material impact on the Company’s Consolidated Condensed Financial Statements as of and for the year ended September 30, 2019. See Note 2 - Revenue for additional disclosures required by ASC 606. In February 2018, the FASB issued guidance that allows companies to reclassify stranded tax effects resulting from the 2017 Tax Cuts and Jobs Act, from accumulated other comprehensive income to retained earnings. This guidance is effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted, and is effective for the Company in fiscal 2020. Upon adoption of this guidance as of October 1, 2019, based on our evaluation, we elected not to reclassify the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. Issued but not yet effective accounting pronouncements In March 2020, the FASB issued guidance relating to accounting for the discontinuation of the LIBOR rate. This guidance provides practical expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. This guidance is applicable to contract modifications that replace a reference LIBOR rate affected by reference rate reform. The amendments may be applied through December 31, 2022. The Company will apply this guidance to transactions and modifications of these arrangements. 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. Our effective date for adoption of this ASU is our fiscal year beginning October 1, 2021 with early adoption permitted. We are currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and the related disclosures. In April 2019, the FASB issued guidance relating to accounting for credit losses on financial instruments, including trade receivables and derivatives and hedging. This guidance is effective for all entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted, and will be effective for the Company beginning in 2020. We are currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and the related disclosures. In August 2018, the FASB issued guidance which modifies the disclosures on fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This guidance expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This guidance is effective for fiscal years beginning after December 15, 2019, with early adoption permitted, and will be effective for the Company beginning in 2021. We are currently evaluating the effects that the adoption of this guidance will have 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 will be effective for the Company beginning in 2022. We are currently evaluating the effects that the adoption of this guidance will have 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.

DISCONTINUED OPERATIONS

DISCONTINUED OPERATIONS	6 Months Ended
	Mar. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
DISCONTINUED OPERATIONS	DISCONTINUED OPERATIONS On November 16, 2017, Griffon announced it entered into a definitive agreement to sell Clopay Plastics Products ("Plastics") and on February 6, 2018, completed the sale to Berry for $465,000 , net of certain post-closing adjustments. During the second quarter of 2019, Griffon recorded an $11,000 charge ( $7,646 , net of tax) to discontinued operations. The charge consisted primarily of a purchase price adjustment to resolve a claim related to the $465,000 Plastics divestiture and included an additional reserve for a legacy environmental matter. During the third quarter of 2019, $9,500 of this charge was paid. In 2008, as a result of the downturn in the residential housing market, Griffon exited substantially all operating activities of its Installation Services segment which sold, installed and serviced garage doors and openers, fireplaces, floor coverings, cabinetry and a range of related building products, primarily for the new residential housing market. Griffon substantially concluded its remaining disposal activities in 2009. Installation Services operating results have been reported as discontinued operations in the Consolidated Statements of Operations and Comprehensive Income (Loss) for all periods presented; Installation Services is excluded from segment reporting. There was no Installation Services revenue or income for the three and six months ended March 31, 2020 and 2019. In 2017, Griffon recorded $5,700 of reserves in discontinued operations related to historical environmental remediation efforts and to increase the reserve for homeowner association (HOA) claims related to the Clopay Services Corporation discontinued operations in 2008. The following amounts summarize the total assets and liabilities of Plastics and Installation Services and other discontinued activities which have been segregated from Griffon’s continuing operations, and are reported as assets and liabilities of discontinued operations in the Condensed Consolidated Balance Sheets: At March 31, 2020 At September 30, 2019 Assets of discontinued operations: Prepaid and other current assets $ 321 $ 321 Other long-term assets 2,873 2,888 Total assets of discontinued operations $ 3,194 $ 3,209 Liabilities of discontinued operations: Accrued liabilities, current $ 2,450 $ 4,333 Other long-term liabilities 3,154 3,331 Total liabilities of discontinued operations $ 5,604 $ 7,664 At March 31, 2020

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	6 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
RESTRUCTURING CHARGES	RESTRUCTURING CHARGES In November 2019, Griffon announced the development of a next-generation business platform for CPP to enhance the growth, efficiency, and competitiveness of its U.S. operations. This initiative includes three key development areas. First, multiple independent information systems will be unified into a single data and analytics platform which will serve the whole CPP U.S. enterprise. Second, certain CPP U.S. operations will be consolidated to optimize facilities footprint and talent. Third, strategic investments in automation and facilities expansion will be made to increase the efficiency of our manufacturing and fulfillment operations, and support e-commerce growth. The expected costs to implement this new business platform, over the three-year duration of the project, will include approximately $35,000 of one-time charges and approximately $40,000 in capital investments. The one-time charges are comprised of $16,000 of cash charges, which includes $12,000 personnel-related costs such as training, severance, and duplicate personnel costs and $4,000 of facility and lease exit costs. The remaining $19,000 of charges are non-cash and are primarily related to asset write-downs. In the quarter and six months ended March 31, 2020, CPP incurred pre-tax restructuring and related exit costs approximating $3,104 and $9,538 , respectively. For the six month period ended March 31, 2020, the cash charges are comprised of $4,846 and non-cash, asset-related charges of $4,692 ; the cash charges included $3,792 for one-time termination benefits and other personnel-related costs and $1,054 for facility exit costs. Non-cash charges included a $1,968 impairment charge related to a facility’s operating lease as well as $671 of leasehold improvements made to the leased facility and $304 of inventory that have no recoverable value, and a $1,749 impairment charge related to machinery and equipment that have no recoverable value at one of the Company's owned manufacturing locations. As a result of these transactions, headcount was reduced by 148 . A summary of the restructuring and other related charges included in Cost of goods and services and Selling, general and administrative expenses in the Company's Condensed Consolidated Statements of Operations were as follows: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Cost of goods and services $ 1,353 $ 4,076 Selling, general and administrative expenses 1,751 5,462 Total restructuring charges $ 3,104 $ 9,538 For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Personnel related costs $ 1,658 $ 3,792 Facilities, exit costs and other 914 1,054 Non-cash facility and other 532 4,692 Total $ 3,104 $ 9,538 The following table summarizes the accrued liabilities of the Company's restructuring actions: Cash Charges Non-Cash Personnel related costs Facilities & Facility and Other Costs Total Accrued liability at September 30, 2019 $ — $ — $ — $ — Q1 restructuring charges 2,134 140 4,160 6,434 Cash payments (621 ) (140 ) — (761 ) Non-cash charges (1) — — (4,160 ) (4,160 ) Accrued liability at December 31, 2019 $ 1,513 $ — $ — $ 1,513 Q2 restructuring charges 1,658 914 532 3,104 Cash payments (1,041 ) (914 ) — (1,955 ) Non-cash charges (1) — — (532 ) (532 ) Accrued liability at March 31, 2020 $ 2,130 $ — $ — $ 2,130 (1) Non-cash charges in Facility and Other Costs primarily represent the non-cash write-off of certain long-lived assets in connection with certain facility closures.

OTHER INCOME (EXPENSE)

OTHER INCOME (EXPENSE)	6 Months Ended
	Mar. 31, 2020
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended March 31, 2020 and 2019 , Other income (expense) includes $745 and ($118) , respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan income of $389 and $787 , respectively, as well as $(230) and $108 , respectively, of net investment (loss) income. For the six months ended March 31, 2020 and 2019, Other income (expense) includes $369 and $384 , respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan income of $778 and 1,574 , respectively, as well as $(149) and $31 , respectively, of net investment (loss) income. During the six months ended March 31, 2020, Other income (expense) also includes a one-time contract award of $700

WARRANTY LIABILITY

WARRANTY LIABILITY	6 Months Ended
	Mar. 31, 2020
Product Warranties Disclosures [Abstract]
WARRANTY LIABILITY	WARRANTY LIABILITY DE offers warranties against product defects for periods generally ranging from one to two years, depending on the specific product and terms of the customer purchase agreement. HBP also offers warranties against product defects for periods generally ranging from one to ten years, with limited lifetime warranties on certain door models. Typical warranties require CPP, HBP and DE to repair or replace the defective products during the warranty period at no cost to the customer. At the time revenue is recognized, Griffon records a liability for warranty costs, estimated based on historical experience, and periodically assesses its warranty obligations and adjusts the liability as necessary. CPP offers an express limited warranty for a period of ninety days on all products from the date of original purchase unless otherwise stated on the product or packaging from the date of original purchase. Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Balance, beginning of period $ 7,344 $ 9,041 $ 7,894 $ 8,174 Warranties issued and changes in estimated pre-existing warranties 4,862 4,700 8,227 8,761 Actual warranty costs incurred (4,417 ) (5,730 ) (8,332 ) (8,924 ) Balance, end of period $ 7,789 $ 8,011 $ 7,789 $ 8,011

OTHER COMPREHENSIVE INCOME (LOS

OTHER COMPREHENSIVE INCOME (LOSS)	6 Months Ended
	Mar. 31, 2020
OCI, Net of Tax [Abstract]
OTHER COMPREHENSIVE INCOME (LOSS)	OTHER COMPREHENSIVE INCOME (LOSS) The amounts recognized in other comprehensive income (loss) were as follows: Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation adjustments $ (16,471 ) $ — $ (16,471 ) $ 2,885 $ — $ 2,885 Pension and other defined benefit plans 847 (178 ) 669 201 (17 ) 184 Cash flow hedges 1,383 (415 ) 968 (264 ) 75 (189 ) Total other comprehensive income (loss) $ (14,241 ) $ (593 ) $ (14,834 ) $ 2,822 $ 58 $ 2,880 Six Months Ended March 31, 2020 Six Months Ended March 31, 2019 Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation adjustments $ (10,001 ) $ — $ (10,001 ) $ (2,851 ) $ — $ (2,851 ) Pension and other defined benefit plans 1,694 (353 ) 1,341 472 (104 ) 368 Cash flow hedges 953 (286 ) 667 (107 ) 20 (87 ) Total other comprehensive income (loss) $ (7,354 ) $ (639 ) $ (7,993 ) $ (2,486 ) $ (84 ) $ (2,570 ) The components of Accumulated other comprehensive income (loss) are as follows: At March 31, 2020 At September 30, 2019 Foreign currency translation adjustments $ (41,285 ) $ (31,284 ) Pension and other defined benefit plans (33,473 ) (34,814 ) Change in Cash flow hedges 849 182 $ (73,909 ) $ (65,916 ) Amounts reclassified from accumulated other comprehensive income (loss) to income were as follows: For the Three Months Ended March 31, For the Six Months Ended March 31, Gain (Loss) 2020 2019 2020 2019 Pension amortization $ (1,046 ) $ (225 ) $ (2,092 ) $ (451 ) Cash flow hedges 1,050 310 994 992 Total gain (loss) $ 4 $ 85 (1,098 ) 541 Tax benefit (expense) (1 ) (18 ) 231 (114 ) Total $ 3 $ 67 $ (867 ) $ 427

LEASES

LEASES	6 Months Ended
	Mar. 31, 2020
Leases [Abstract]
LEASES	LEASES In February 2016, the FASB issued an Accounting Standards Update (ASU 2016-02) related to the accounting and financial statement presentation for leases. This new guidance requires a lessee to recognize right-of-use ("ROU") assets and lease liabilities on the balance sheet, with an election to exempt leases with a term of twelve months or less. The Company adopted the requirements of the new standard as of October 1, 2019 and 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 have 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 Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. 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. The Company's finance leases are immaterial. ROU assets, along with any other related long-lived assets, are periodically evaluated for impairment. In connection with the Company's restructuring activities, during the six months ended March 31, 2020, a $1,968 impairment charge was recorded related to a facility’s operating lease as well as $671 and of leasehold improvements made to the leased facility that have no recoverable value. See Note 16, Restructuring Charges. 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 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. 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). Components of operating lease costs are as follows: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Fixed $ 9,187 $ 18,739 Variable (a), (b) 1,823 3,576 Short-term (b) 1,393 2,823 Total* $ 12,403 $ 25,138 (a) Primarily related to common-area maintenance and property taxes. (b) Not recorded on the balance sheet. Supplemental cash flow information were as follows: For the Six Months ended March 31, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 21,582 Financing cash flows from finance leases 1,940 Total $ 23,522 Supplemental Condensed Consolidated Balance Sheet information related to leases were as follows: At March 31, 2020 Operating Leases: Right of use assets: Operating right-of-use assets $ 156,258 Lease Liabilities: Current portion of operating lease liabilities $ 28,047 Long-term operating lease liabilities 133,498 Total operating lease liabilities $ 161,545 Finance Leases: Property, plant and equipment, net (1) $ 14,059 Lease Liabilities: Notes payable and current portion of long-term debt $ 4,014 Long-term debt, net 10,074 Total financing lease liabilities $ 14,088 (1) Finance lease assets are recorded net of accumulated depreciation of $1,946 . The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2020 are as follows (in thousands): Operating Leases Finance Leases 2020 (a) $ 17,505 $ 2,452 2021 33,312 4,164 2022 28,570 2,607 2023 22,261 2,315 2024 16,467 2,074 2025 14,334 1,383 Thereafter 72,614 — Total lease payments 205,063 14,995 Less: Imputed Interest (43,518 ) (907 ) Present value of lease liabilities $ 161,545 $ 14,088 (a) Excluding the six months ended March 31, 2020 The aggregate minimum lease payments for operating leases, as calculated prior to the adoption of ASU 2016-02, were as follows: At September 30, 2019 2020 $ 35,176 2021 30,730 2022 26,119 2023 20,008 2024 14,198 Thereafter 78,105 Total $ 204,336 Average lease terms and discount rates were as follows: At March 31, 2020 Weighted-average remaining lease term (years) Operating leases 8.8 Finance Leases 2.1 Weighted-average discount rate Operating Leases 4.10 % Finance Leases 5.50 %
LEASES	LEASES In February 2016, the FASB issued an Accounting Standards Update (ASU 2016-02) related to the accounting and financial statement presentation for leases. This new guidance requires a lessee to recognize right-of-use ("ROU") assets and lease liabilities on the balance sheet, with an election to exempt leases with a term of twelve months or less. The Company adopted the requirements of the new standard as of October 1, 2019 and 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 have 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 Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. 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. The Company's finance leases are immaterial. ROU assets, along with any other related long-lived assets, are periodically evaluated for impairment. In connection with the Company's restructuring activities, during the six months ended March 31, 2020, a $1,968 impairment charge was recorded related to a facility’s operating lease as well as $671 and of leasehold improvements made to the leased facility that have no recoverable value. See Note 16, Restructuring Charges. 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 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. 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). Components of operating lease costs are as follows: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Fixed $ 9,187 $ 18,739 Variable (a), (b) 1,823 3,576 Short-term (b) 1,393 2,823 Total* $ 12,403 $ 25,138 (a) Primarily related to common-area maintenance and property taxes. (b) Not recorded on the balance sheet. Supplemental cash flow information were as follows: For the Six Months ended March 31, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 21,582 Financing cash flows from finance leases 1,940 Total $ 23,522 Supplemental Condensed Consolidated Balance Sheet information related to leases were as follows: At March 31, 2020 Operating Leases: Right of use assets: Operating right-of-use assets $ 156,258 Lease Liabilities: Current portion of operating lease liabilities $ 28,047 Long-term operating lease liabilities 133,498 Total operating lease liabilities $ 161,545 Finance Leases: Property, plant and equipment, net (1) $ 14,059 Lease Liabilities: Notes payable and current portion of long-term debt $ 4,014 Long-term debt, net 10,074 Total financing lease liabilities $ 14,088 (1) Finance lease assets are recorded net of accumulated depreciation of $1,946 . The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2020 are as follows (in thousands): Operating Leases Finance Leases 2020 (a) $ 17,505 $ 2,452 2021 33,312 4,164 2022 28,570 2,607 2023 22,261 2,315 2024 16,467 2,074 2025 14,334 1,383 Thereafter 72,614 — Total lease payments 205,063 14,995 Less: Imputed Interest (43,518 ) (907 ) Present value of lease liabilities $ 161,545 $ 14,088 (a) Excluding the six months ended March 31, 2020 The aggregate minimum lease payments for operating leases, as calculated prior to the adoption of ASU 2016-02, were as follows: At September 30, 2019 2020 $ 35,176 2021 30,730 2022 26,119 2023 20,008 2024 14,198 Thereafter 78,105 Total $ 204,336 Average lease terms and discount rates were as follows: At March 31, 2020 Weighted-average remaining lease term (years) Operating leases 8.8 Finance Leases 2.1 Weighted-average discount rate Operating Leases 4.10 % Finance Leases 5.50 %

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	6 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES Legal and environmental Peekskill Site. Lightron Corporation (“Lightron”), a wholly-owned subsidiary of Griffon, once conducted operations at a location in Peekskill in the Town of Cortlandt, New York (the “Peekskill Site”) owned by ISC Properties, Inc. (“ISCP”), a wholly-owned subsidiary of Griffon. ISCP sold the Peekskill Site in November 1982. Subsequently, ISCP was advised by the Department of Environmental Conservation of New York State ("DEC") that random sampling at the Peekskill Site and in a creek near the Peekskill Site indicated concentrations of solvents and other chemicals common to Lightron’s prior plating operations. In 1996, ISCP entered into a consent order with the DEC (the “Consent Order”), pursuant to which ISCP was required to perform a remedial investigation and prepare a feasibility study (the “Feasibility Study”). After completing the initial remedial investigation, ISCP conducted, over the next several years, supplemental remedial investigations, including soil vapor investigations, as required by the Consent Order. In April 2009, the DEC advised ISCP that both the DEC and the New York State Department of Health had reviewed and accepted an August 2007 Remedial Investigation Report and an Additional Data Collection Summary Report dated January 30, 2009. ISCP submitted to the DEC a draft Feasibility Study which was accepted and approved by the DEC in February 2011. ISCP satisfied its obligations under the Consent Order when DEC approved the Remedial Investigation and Feasibility Study for the Peekskill Site. In June, 2011 the DEC issued a Remedial Action Plan for the Peekskill Site that set forth the specific remedies selected and responded to public comments. The approximate cost of the remedy proposed by DEC in its Remedial Action Plan was approximately $10,000 . Following issuance of the Remedial Action Plan, the DEC implemented a portion of its plan, and also performed additional investigation for the presence of metals in soils and sediments downstream from the Peekskill Site. During this investigation chromium was found to be present in sediments further downstream of the Peekskill site than previously detected. In August 2018, the DEC sent a letter to the United States Environmental Protection Agency (the “EPA”), in which the DEC requested that the Peekskill Site be nominated by the EPA for inclusion on the National Priorities List (the “NPL”). Based on DEC’s request and on an analysis by a consultant retained by the EPA, on May 15, 2019 the EPA added the Peekskill Site to the NPL under the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA) and is now performing a Remedial Investigation/Feasibility Study. The EPA estimates that it will select a remedy in 2022. The EPA has announced that it is performing its own remedial investigation/feasibility study of the site. It is uncertain what subsequent action the EPA will take. The EPA may, on its own or through the use of consultants, perform further studies of the site and/or subsequently remediate the site, and in such event, would likely seek reimbursement for the costs incurred from potentially responsible parties (“PRPs”). Alternatively, the EPA could enter into negotiations with the PRPs to request that the PRPs perform further studies and/or remediate the site. Griffon does not acknowledge any responsibility to perform any remediation at the Peekskill Site. Improper Advertisement Claim involving Union Tools ® Products. Beginning in December 2004, a customer of AMES had been named in various litigation matters relating to certain Union Tools products. The plaintiffs in those litigation matters asserted causes of action against the customer of AMES for improper advertisement to end consumers. The allegations suggested that advertisements led the consumers to believe that Union Tools’ hand tools were wholly manufactured within boundaries of the United States. The complaints asserted various causes of action against the customer of AMES under federal and state law, including common law fraud. At some point, the customer may seek indemnity (including recovery of its legal fees and costs) against AMES for an unspecified amount. Presently, AMES cannot estimate the amount of loss, if any, if the customer were to seek legal recourse against AMES. Union Fork and Hoe, Frankfort, NY site. The former Union Fork and Hoe property in Frankfort, NY was acquired by AMES in 2006 as part of a larger acquisition, and has historic site contamination involving chlorinated solvents, petroleum hydrocarbons and metals. AMES has entered into an Order on Consent with the New York State Department of Environmental Conservation. While the Order is without admission or finding of liability or acknowledgment that there has been a release of hazardous substances at the site, AMES is required to perform a remedial investigation and to recommend a remediation option. At the conclusion of the remediation phase to the satisfaction of the DEC, the DEC will issue a Certificate of Completion. AMES has performed significant investigative and remedial activities over the last few years under work plans approved by the DEC and is currently implementing a Remedial Action Work Plan for the site property that was approved by the DEC; the work required by such Remedial Action Work Plan is expected to be completed by summer 2020. The DEC has also requested that AMES develop a work plan to investigate certain areas immediately adjacent to the former Union Fork and Hoe site. AMES has a number of defenses to liability in this matter, including its rights under a previous Consent Judgment entered into between the DEC and a predecessor of AMES relating to the site. U.S. Government investigations and claims Defense contracts and subcontracts, including Griffon’s contracts and subcontracts, are subject to audit and review by various agencies and instrumentalities of the United States government, including among others, the Defense Contract Audit Agency, the Defense Criminal Investigative Service, and the Department of Justice which has responsibility for asserting claims on behalf of the U.S. Government. In general, departments and agencies of the U.S. Government have the authority to investigate various transactions and operations of Griffon, and the results of such investigations may lead to administrative, civil or criminal proceedings, the ultimate outcome of which could be fines, penalties, repayments or compensatory or treble damages. U.S. Government regulations provide that certain findings against a contractor may lead to suspension or debarment from future U.S. Government contracts or the loss of export privileges for a company or an operating division or subdivision. Suspension or debarment could have a material adverse effect on Telephonics because of its reliance on government contracts. General legal Griffon is subject to various laws and regulations relating to the protection of the environment and is a party to legal proceedings arising in the ordinary course of business. Management believes, based on facts presently known to it, that the resolution of the matters above and such other matters will not have a material adverse effect on Griffon’s consolidated financial position, results of operations or cash flows.

CONSOLIDATING GUARANTOR AND NON

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	6 Months Ended
	Mar. 31, 2020
Consolidating Guarantor And Non Guarantor Financial Information [Abstract]
CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION	CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION Griffon’s Senior Notes are fully and unconditionally guaranteed, jointly and severally by Clopay Corporation, Telephonics Corporation, The AMES Companies, Inc., ATT Southern LLC, Clopay Ames Holding Corp., ClosetMaid LLC, CornellCookson, LLC and Cornell Real Estate Holdings, LLC, all of which are indirectly 100% owned by Griffon. In accordance with Rule 3-10 of Regulation S-X promulgated under the Securities Act, presented below are condensed consolidating financial information as of March 31, 2020 and September 30, 2019 and for the three months ended March 31, 2020 and 2019 . The financial information may not necessarily be indicative of the results of operations or financial position of the guarantor companies or non-guarantor companies had they operated as independent entities. The guarantor companies and the non-guarantor companies include the consolidated financial results of their wholly-owned subsidiaries accounted for under the equity method. The indentures relating to the Senior Notes (the “Indentures”) contain terms providing that, under certain limited circumstances, a guarantor will be released from its obligations to guarantee the Senior Notes. These circumstances include (i) a sale of at least a majority of the stock, or all or substantially all the assets, of the subsidiary guarantor as permitted by the Indentures; (ii) a public equity offering of a subsidiary guarantor that qualifies as a “Minority Business” as defined in the Indentures (generally, a business the EBITDA of which constitutes less than 50% CONDENSED CONSOLIDATING BALANCE SHEETS At March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CURRENT ASSETS Cash and equivalents $ 9,252 $ 18,977 $ 40,795 $ — $ 69,024 Accounts receivable, net of allowances — 283,929 206,456 (155,352 ) 335,033 Contract costs and recognized income not yet billed, net of progress payments — 91,998 2,497 — 94,495 Inventories, net — 391,934 70,756 (571 ) 462,119 Prepaid and other current assets 11,482 23,468 5,149 2,624 42,723 Assets of discontinued operations — — 321 — 321 Total Current Assets 20,734 810,306 325,974 (153,299 ) 1,003,715 PROPERTY, PLANT AND EQUIPMENT, net 1,295 290,685 43,840 — 335,820 OPERATING LEASE RIGHT-OF-USE ASSETS 10,060 127,133 19,065 — 156,258 GOODWILL — 375,734 61,048 — 436,782 INTANGIBLE ASSETS, net 93 220,796 132,854 — 353,743 INTERCOMPANY RECEIVABLE 67,266 928,899 148,568 (1,144,733 ) — EQUITY INVESTMENTS IN SUBSIDIARIES 1,658,792 745,746 3,109,559 (5,514,097 ) — OTHER ASSETS 8,695 37,669 (2,446 ) (14,362 ) 29,556 ASSETS OF DISCONTINUED OPERATIONS — — 2,873 — 2,873 Total Assets $ 1,766,935 $ 3,536,968 $ 3,841,335 $ (6,826,491 ) $ 2,318,747 CURRENT LIABILITIES Notes payable and current portion of long-term debt $ — $ 3,474 $ 5,996 $ — $ 9,470 Accounts payable and accrued liabilities 28,873 412,118 58,903 (152,741 ) 347,153 Current portion of operating lease liabilities 1,830 22,068 4,149 — 28,047 Liabilities of discontinued operations — — 2,450 — 2,450 Total Current Liabilities 30,703 437,660 71,498 (152,741 ) 387,120 LONG-TERM DEBT, net 1,167,023 10,642 38,561 — 1,216,226 LONG-TERM OPERATING LEASE LIABILITIES 9,353 108,872 15,273 — 133,498 INTERCOMPANY PAYABLES 63,230 563,964 536,815 (1,164,009 ) — OTHER LIABILITIES 20,172 77,292 12,650 (7,819 ) 102,295 LIABILITIES OF DISCONTINUED OPERATIONS — — 3,154 — 3,154 Total Liabilities 1,290,481 1,198,430 677,951 (1,324,569 ) 1,842,293 SHAREHOLDERS’ EQUITY 476,454 2,338,538 3,163,384 (5,501,922 ) 476,454 Total Liabilities and Shareholders’ Equity $ 1,766,935 $ 3,536,968 $ 3,841,335 $ (6,826,491 ) $ 2,318,747 CONDENSED CONSOLIDATING BALANCE SHEETS At September 30, 2019 ($ in thousands) Parent Guarantor Non-Guarantor Elimination Consolidation CURRENT ASSETS Cash and equivalents $ 1,649 $ 25,217 $ 45,511 $ — $ 72,377 Accounts receivable, net of allowances — 227,069 38,580 (1,199 ) 264,450 Contract costs and recognized income not yet billed, net of progress payments — 104,109 1,002 — 105,111 Inventories, net — 372,839 69,540 (258 ) 442,121 Prepaid and other current assets 8,238 25,754 6,951 (144 ) 40,799 Assets of discontinued operations — — 321 — 321 Total Current Assets 9,887 754,988 161,905 (1,601 ) 925,179 PROPERTY, PLANT AND EQUIPMENT, net 1,184 289,282 46,860 — 337,326 GOODWILL — 375,734 61,333 — 437,067 INTANGIBLE ASSETS, net 93 224,275 132,271 — 356,639 INTERCOMPANY RECEIVABLE 5,834 864,884 75,684 (946,402 ) — EQUITY INVESTMENTS IN SUBSIDIARIES 1,628,031 581,438 3,233,038 (5,442,507 ) — OTHER ASSETS 8,182 24,635 (2,352 ) (14,625 ) 15,840 ASSETS OF DISCONTINUED OPERATIONS — — 2,888 — 2,888 Total Assets $ 1,653,211 $ 3,115,236 $ 3,711,627 $ (6,405,135 ) $ 2,074,939 CURRENT LIABILITIES Notes payable and current portion of long-term debt $ — $ 3,075 $ 7,450 $ — $ 10,525 Accounts payable and accrued liabilities 41,796 266,411 68,390 (1,356 ) 375,241 Liabilities of discontinued operations — — 4,333 — 4,333 Total Current Liabilities 41,796 269,486 80,173 (1,356 ) 390,099 LONG-TERM DEBT, net 1,040,449 3,119 50,181 — 1,093,749 INTERCOMPANY PAYABLES 71,634 457,265 444,557 (973,456 ) — OTHER LIABILITIES 21,569 81,582 15,017 (8,171 ) 109,997 LIABILITIES OF DISCONTINUED OPERATIONS — — 3,331 — 3,331 Total Liabilities 1,175,448 811,452 593,259 (982,983 ) 1,597,176 SHAREHOLDERS’ EQUITY 477,763 2,303,784 3,118,368 (5,422,152 ) 477,763 Total Liabilities and Shareholders’ Equity $ 1,653,211 $ 3,115,236 $ 3,711,627 $ (6,405,135 ) $ 2,074,939 CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation Revenue $ — $ 462,500 $ 113,926 $ (10,076 ) $ 566,350 Cost of goods and services — 345,626 79,112 (10,420 ) 414,318 Gross profit — 116,874 34,814 344 152,032 Selling, general and administrative expenses 7,922 91,338 27,300 (93 ) 126,467 Income (loss) from operations (7,922 ) 25,536 7,514 437 25,565 Other income (expense) Interest income (expense), net (6,880 ) (9,706 ) 25 — (16,561 ) Loss from debt extinguishment, net (6,690 ) — — — (6,690 ) Other, net (418 ) (2,667 ) 4,141 (441 ) 615 Total other income (expense) (13,988 ) (12,373 ) 4,166 (441 ) (22,636 ) Income (loss) before taxes (21,910 ) 13,163 11,680 (4 ) 2,929 Provision (benefit) for income taxes (9,427 ) 6,078 5,387 (4 ) 2,034 Income (loss) before equity in net income of subsidiaries (12,483 ) 7,085 6,293 — 895 Equity in net income (loss) of subsidiaries 13,378 6,341 7,085 (26,804 ) — Net Income (loss) $ 895 $ 13,426 $ 13,378 $ (26,804 ) $ 895 Comprehensive income (loss) $ (13,939 ) $ 8,028 $ 18,776 $ (26,804 ) $ (13,939 ) CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2019 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation Revenue $ — $ 462,739 $ 94,285 $ (7,391 ) $ 549,633 Cost of goods and services — 354,382 65,516 (7,769 ) 412,129 Gross profit — 108,357 28,769 378 137,504 Selling, general and administrative expenses 5,249 84,813 21,409 312 111,783 Income (loss) from operations (5,249 ) 23,544 7,360 66 25,721 Other income (expense) Interest income (expense), net (7,328 ) (9,128 ) (849 ) — (17,305 ) Other, net (473 ) 1,129 676 (64 ) 1,268 Total other income (expense) (7,801 ) (7,999 ) (173 ) (64 ) (16,037 ) Income (loss) before taxes (13,050 ) 15,545 7,187 2 9,684 Provision (benefit) for income taxes (4,242 ) 5,292 2,142 2 3,194 Income (loss) before equity in net income of subsidiaries (8,808 ) 10,253 5,045 — 6,490 Equity in net income (loss) of subsidiaries 7,652 11,646 10,253 (29,551 ) — Income (loss) from continuing operations (1,156 ) 21,899 15,298 (29,551 ) 6,490 Income (loss) from operation of discontinued businesses — — (11,000 ) — (11,000 ) Provision (benefit) from income taxes — — (3,354 ) — (3,354 ) Income (loss) from discontinued operations — — (7,646 ) — (7,646 ) Net Income (loss) $ (1,156 ) $ 21,899 $ 7,652 $ (29,551 ) $ (1,156 ) Comprehensive income (loss) $ 1,724 $ 5,448 $ 8,736 $ (14,184 ) $ 1,724 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Six Months Ended March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 11,507 $ 32,202 $ 32,034 $ (64,236 ) $ 11,507 Net cash provided by (used in) operating activities: (92,042 ) 26,593 4,606 — (60,843 ) CASH FLOWS FROM INVESTING ACTIVITIES: Acquisition of property, plant and equipment (282 ) (19,982 ) (2,255 ) — (22,519 ) Acquired businesses, net of cash acquired — — (10,531 ) — (10,531 ) Proceeds from sale of assets — 292 (2 ) — 290 Net cash provided by (used in) investing activities (282 ) (19,690 ) (12,788 ) — (32,760 ) CASH FLOWS FROM FINANCING ACTIVITIES: Purchase of shares for treasury (7,479 ) — — — (7,479 ) Proceeds from long-term debt 1,054,636 — 6,707 — 1,061,343 Payments of long-term debt (921,904 ) (1,752 ) (15,415 ) — (939,071 ) Financing costs (13,176 ) — — — (13,176 ) Dividends paid (7,349 ) — — — (7,349 ) Other, net (4,801 ) (10,839 ) 15,723 — 83 Net cash provided by (used in) financing activities 99,927 (12,591 ) 7,015 — 94,351 CASH FLOWS FROM DISCONTINUED OPERATIONS: Net cash provided by (used) in discontinued operations — — (1,994 ) — (1,994 ) Effect of exchange rate changes on cash and equivalents — (552 ) (1,555 ) — (2,107 ) NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS 7,603 (6,240 ) (4,716 ) — (3,353 ) CASH AND EQUIVALENTS AT BEGINNING OF PERIOD 1,649 25,217 45,511 — 72,377 CASH AND EQUIVALENTS AT END OF PERIOD $ 9,252 $ 18,977 $ 40,795 $ — $ 69,024 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Six Months Ended March 31, 2019 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 7,597 $ 38,703 $ 24,499 $ (63,202 ) $ 7,597 Net (income) loss from discontinued operations — — 7,646 — 7,646 Net cash provided by (used in) operating activities: (77,881 ) 24,130 (1,255 ) — (55,006 ) CASH FLOWS FROM INVESTING ACTIVITIES: Acquisition of property, plant and equipment (210 ) (14,071 ) (3,137 ) — (17,418 ) Acquired businesses, net of cash acquired (9,219 ) — — — (9,219 ) Investment purchases (149 ) — — — (149 ) Insurance payments (10,604 ) — — — (10,604 ) Proceeds from sale of assets — 36 26 — 62 Net cash provided by (used in) investing activities (20,182 ) (14,035 ) (3,111 ) — (37,328 ) CASH FLOWS FROM FINANCING ACTIVITIES: Purchase of shares for treasury (1,478 ) — — — (1,478 ) Proceeds from long-term debt 130,484 76 12,541 — 143,101 Payments of long-term debt (32,419 ) (1,724 ) (14,026 ) — (48,169 ) Contingent consideration for acquired businesses — — (1,686 ) — (1,686 ) Financing costs (945 ) — — — (945 ) Dividends paid (6,847 ) — — — (6,847 ) Other, net (1,641 ) 7,150 (5,426 ) — 83 Net cash provided by (used in) financing activities 87,154 5,502 (8,597 ) — 84,059 CASH FLOWS FROM DISCONTINUED OPERATIONS: Net cash provided by (used in) discontinued operations — — (3,438 ) — (3,438 ) Effect of exchange rate changes on cash and equivalents — (92 ) 26 — (66 ) NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS (10,909 ) 15,505 (16,375 ) — (11,779 ) CASH AND EQUIVALENTS AT BEGINNING OF PERIOD 15,976 16,353 37,429 — 69,758 CASH AND EQUIVALENTS AT END OF PERIOD $ 5,067 $ 31,858 $ 21,054 $ — $ 57,979

DESCRIPTION OF BUSINESS AND B_2

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies)	6 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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 year ended September 30, 2019 , 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 CPP operations 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, 2019 was derived from the audited financial statements included in Griffon’s Annual Report on Form 10-K for the year ended September 30, 2019 . The condensed consolidated financial statements include the accounts of Griffon and all subsidiaries. Intercompany accounts and transactions have been eliminated in consolidation. 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 allowances for doubtful accounts receivable and returns, net realizable value of inventories, restructuring reserves, valuation of goodwill and intangible assets, percentage of completion method of accounting, pension assumptions, useful lives associated with depreciation and amortization of fixed and intangible assets, warranty reserves, sales incentive accruals, stock based compensation assumptions, income taxes and tax valuation reserves, environmental reserves, legal reserves, insurance reserves and the valuation of assets and liabilities of discontinued operations, acquisition assumptions used 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. Certain amounts in the prior year have been reclassified to conform to current year presentation.
Fair Value Measurements	FAIR VALUE MEASUREMENTS The carrying values of cash and equivalents, accounts receivable, accounts and notes payable, and revolving credit and variable interest rate 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 and variable rate debt is based upon current market rates. Applicable accounting guidance establishes a fair value hierarchy requiring 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.
Inventories	INVENTORIES Inventories are stated at the lower of cost (first-in, first-out or average) or market.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In February 2016, the FASB issued guidance on lease accounting requiring lessees to recognize a right-of-use asset and a lease liability for long-term leases and to disclose additional quantitative and qualitative information about leasing arrangements. During 2019, the Company developed a project plan to guide the implementation of this guidance. The Company completed this plan including surveying the Company’s businesses, assessing the Company’s portfolio of leases and compiling a central repository of active leases. The Company also implemented a lease accounting software solution to support the new reporting requirements and established a future lease process to keep the lease accounting portfolio up to date. The Company evaluated key policy elections and considerations under the standard and completed an internal policy as well as training to address the new standard requirements. The Company has elected the package of practical expedients and will not apply the recognition requirements to short-term leases. The Company adopted the requirements of the new standard as of October 1, 2019 and 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 have recognized right-of-use 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 Condensed Consolidated Statements of Income or Condensed Consolidated Statements of Cash Flows. In May 2017, the FASB issued guidance to address the situation when a company modifies the terms of a stock compensation award previously granted to an employee. This guidance is effective, and should be applied prospectively, for fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period. The new guidance was effective for the Company beginning in fiscal 2019; however, the Company adopted this guidance as of October 1, 2018 and it did not have a material impact on the Company's financial condition, results of operations and related disclosures. In March 2017, the FASB issued amendments to the Compensation - Retirement Benefits guidance which requires companies to retrospectively present the service cost component of net periodic benefit cost for pension and retiree medical plans along with other compensation costs in operating income and present the other components of net periodic benefit cost below operating income in the income statement. The guidance also allows only the service cost component of net periodic benefit cost to be eligible for capitalization within inventory or fixed assets on a prospective basis. This guidance was effective for fiscal years beginning after December 15, 2017. The Company adopted the requirements of the standard as of October 1, 2018 on a retrospective basis reclassifying the other components of the net periodic benefit costs from Selling, general and administrative expenses to a non-service expense within Other (income) expense, net. This guidance did not have a material impact on the Company's results of operations. See Note 11 - Employee Benefit Plans for further information on the implementation of this guidance. In January 2017, the FASB issued guidance that simplifies how an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Step 2 measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill. This guidance is effective for annual periods beginning after December 15, 2019, including interim periods within those periods and is effective for the Company beginning October 1, 2020. The Company does not expect this guidance to have a material impact on the Company's financial condition, results of operations or related disclosures. In August 2016, the FASB issued guidance on the Statement of Cash Flows Classification of certain cash receipts and cash payments (a consensus of the FASB Emerging Issues Task Force). This guidance addresses the following eight specific cash flow issues: Debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (including bank-owned life insurance policies); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. This guidance was effective for the Company beginning in fiscal 2019. The Company adopted the requirements of the standard in the first quarter of 2019 and it did not have a material impact on the Company's financial condition, results of operations and cash flows. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) which supersedes nearly all existing revenue recognition guidance. Subsequent to the issuance of Topic 606, the FASB clarified the guidance through several ASUs; hereinafter the collection of revenue guidance is referred to as “ASC 606”. The core principle of ASC 606 is that revenue should be recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. On October 1, 2018, the Company adopted ASC 606 using the modified retrospective method for all contracts. Results for reporting periods beginning October 1, 2018 are presented under ASC 606, while prior period amounts were not adjusted and continue to be reported in accordance with the Company’s historic accounting under Topic 605, Revenue Recognition. Under the modified retrospective method, the Company recognized the cumulative effect of initially applying this accounting standard as an adjustment to the opening balance in retained earnings of approximately $5,673 as of October 1, 2018. The impact to beginning retained earnings primarily related to certain contracts in the Defense Electronics Segment containing provisions for radar and communication products that have an alternative use and/or no right to payment. The adoption of ASC 606 did not have a material impact on the Company’s Consolidated Condensed Financial Statements as of and for the year ended September 30, 2019. See Note 2 - Revenue for additional disclosures required by ASC 606. In February 2018, the FASB issued guidance that allows companies to reclassify stranded tax effects resulting from the 2017 Tax Cuts and Jobs Act, from accumulated other comprehensive income to retained earnings. This guidance is effective for all entities for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years, with early adoption permitted, and is effective for the Company in fiscal 2020. Upon adoption of this guidance as of October 1, 2019, based on our evaluation, we elected not to reclassify the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. Issued but not yet effective accounting pronouncements In March 2020, the FASB issued guidance relating to accounting for the discontinuation of the LIBOR rate. This guidance provides practical expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. This guidance is applicable to contract modifications that replace a reference LIBOR rate affected by reference rate reform. The amendments may be applied through December 31, 2022. The Company will apply this guidance to transactions and modifications of these arrangements. 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. Our effective date for adoption of this ASU is our fiscal year beginning October 1, 2021 with early adoption permitted. We are currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and the related disclosures. In April 2019, the FASB issued guidance relating to accounting for credit losses on financial instruments, including trade receivables and derivatives and hedging. This guidance is effective for all entities for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted, and will be effective for the Company beginning in 2020. We are currently evaluating the effects that the adoption of this guidance will have on our consolidated financial statements and the related disclosures. In August 2018, the FASB issued guidance which modifies the disclosures on fair value measurements by removing the requirement to disclose the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and the policy for timing of such transfers. This guidance expands the disclosure requirements for Level 3 fair value measurements, primarily focused on changes in unrealized gains and losses included in other comprehensive income (loss). This guidance is effective for fiscal years beginning after December 15, 2019, with early adoption permitted, and will be effective for the Company beginning in 2021. We are currently evaluating the effects that the adoption of this guidance will have 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 will be effective for the Company beginning in 2022. We are currently evaluating the effects that the adoption of this guidance will have 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.

INVENTORIES (Tables)

INVENTORIES (Tables)	6 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	The following table details the components of inventory: At March 31, 2020 At September 30, 2019 Raw materials and supplies $ 122,576 $ 121,791 Work in process 99,730 93,830 Finished goods 239,813 226,500 Total $ 462,119 $ 442,121

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	6 Months Ended
	Mar. 31, 2020
Property, Plant and Equipment [Abstract]
Summary of Property, Plant and Equipment	The following table details the components of property, plant and equipment, net: At March 31, 2020 At September 30, 2019 Land, building and building improvements $ 156,393 $ 133,036 Machinery and equipment 577,573 580,698 Leasehold improvements 51,012 49,808 784,978 763,542 Accumulated depreciation and amortization (449,158 ) (426,216 ) Total $ 335,820 $ 337,326

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES (Tables)	6 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Changes in Carrying Value of Goodwill	The following table provides changes in the carrying value of goodwill by segment during the six months ended March 31, 2020 : At September 30, 2019 Goodwill from acquisitions Other At March 31, 2020 Consumer and Professional Products $ 227,269 $ 3,125 $ (3,410 ) $ 226,984 Home and Building Products 191,253 — — 191,253 Defense Electronics 18,545 — — 18,545 Total $ 437,067 $ 3,125 $ (3,410 ) $ 436,782
Summary of Gross Carrying Value and Accumulated Amortization of Intangible Assets	The following table provides the gross carrying value and accumulated amortization for each major class of intangible assets: At March 31, 2020 At September 30, 2019 Gross Carrying Amount Accumulated Amortization Average Life (Years) Gross Carrying Amount Accumulated Amortization Customer relationships & other $ 182,035 $ 60,935 23 $ 183,515 $ 57,783 Technology and patents 19,076 7,715 13 19,167 7,329 Total amortizable intangible assets 201,111 68,650 202,682 65,112 Trademarks 221,282 — 219,069 — Total intangible assets $ 422,393 $ 68,650 $ 421,751 $ 65,112

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	6 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Summary of Long-Term Debt	At March 31, 2020 At September 30, 2019 Outstanding Balance Original Issuer Premium Capitalized Fees & Expenses Balance Sheet Coupon Interest Rate Outstanding Balance Original Issuer Premium Capitalized Fees & Expenses Balance Sheet Coupon Interest Rate Senior notes due 2028 (a) $ 850,000 $ — (12,854 ) $ 837,146 5.75 % $ — $ — $ — $ — — % Senior notes due 2022 (a) 150,000 104 (1,098 ) 149,006 5.25 % 1,000,000 867 (9,175 ) 991,692 5.25 % Revolver due 2025 (b) 183,548 — (2,678 ) 180,870 Variable 50,000 — (1,243 ) 48,757 Variable Capital lease - real estate (d) 12,406 — (42 ) 12,364 5.00 % 4,388 — (55 ) 4,333 5.00 % Non US lines of credit (e) 9,532 — (97 ) 9,435 Variable 17,576 — (45 ) 17,531 Variable Non US term loans (e) 33,462 — (122 ) 33,340 Variable 36,977 — (188 ) 36,789 Variable Other long term debt (f) 3,552 — (17 ) 3,535 Variable 5,190 — (18 ) 5,172 Variable Totals 1,242,500 104 (16,908 ) 1,225,696 1,114,131 867 (10,724 ) 1,104,274 less: Current portion (9,470 ) — — (9,470 ) (10,525 ) — — (10,525 ) Long-term debt $ 1,233,030 $ 104 $ (16,908 ) $ 1,216,226 $ 1,103,606 $ 867 $ (10,724 ) $ 1,093,749 (a) On February 19, 2020, in an unregistered offering through a private placement under Rule 144A and Regulation S, Griffon issued, at par, $850,000 of 5.75% Senior Notes due 2028 (the “2028 Senior Notes”). Proceeds from the 2028 Senior Notes were used to redeem 85% of the $1,000,000 of 5.25% Senior Notes due 2022 (the “2022 Senior Notes" and, collectively with the 2028 Senior Notes, the "Senior Notes"). Following the sale and issuance of the 2028 Notes transaction, $150,000 aggregate principal amount of the 2022 Notes remained outstanding. As of March 31, 2020 , outstanding Senior Notes due totaled $1,000,000 ; interest is payable semi-annually on March 1 and September 1. The Senior Notes are senior unsecured obligations of Griffon guaranteed by certain domestic subsidiaries, and subject to certain covenants, limitations and restrictions. On April 22, 2020, Griffon exchanged substantially all of the 2028 Senior Notes for substantially identical 2028 Senior Notes registered under the Securities Act of 1933 (the "Securities Act") via an exchange offer. The remaining 2022 Senior Notes outstanding are registered under the Securities Act, having been issued pursuant to similar prior exchange offers. The fair value of the 2022 and 2028 Senior Notes approximated $139,500 and $799,000 , respectively, on March 31, 2020 based upon quoted market prices (level 1 inputs). In connection with these transactions, Griffon capitalized $12,989 of underwriting fees and other expenses incurred related to the issuance and exchange of the 2028 Senior Notes. Furthermore, 85% of the obligations associated with the 2022 Senior Notes were discharged leaving remaining fees of $1,145 . At March 31, 2020 , a combined total amount of $13,952 remained to be amortized. Remaining capitalized fees for the 2022 Senior Notes and all capitalized fees for the 2028 Senior Notes will amortize over the term of each respective note. Additionally, Griffon recognized a $6,690 loss on the early extinguishment of debt on 85% of the 5.25% $1,000,000 senior notes due 2022, comprised primarily of the write-off of $5,873 of remaining deferred financing fees, $607 of tender offer net premium expense and $210 of redemption interest expense. (b) On January 30, 2020, Griffon amended its revolving credit facility (as amended, the "Credit Agreement") to increase the maximum borrowing availability from $350,000 to $400,000 and extend its maturity date from March 22, 2021 to March 22, 2025, except that if the 2022 Senior Notes are not repaid, refinanced or replaced prior to December 1, 2021, then the Credit Agreement will mature on December 1, 2021. The amended agreement also modified certain other provisions of the facility. The facility includes a letter of credit sub-facility with a limit of $100,000 (increased from $50,000 ); a multi-currency sub-facility of $200,000 (increased from $100,000 ); and contains a customary accordion feature that permits us to request, subject to each lender's consent, an increase in the maximum aggregate amount that can be borrowed by up to an additional $100,000 (increased from $50,000 ). Borrowings under the Credit Agreement may be repaid and re-borrowed at any time. Interest is payable on borrowings at either a LIBOR or base rate benchmark rate, plus an applicable margin, which adjusts based on financial performance. Current margins are 1.00% for base rate loans and 2.00% for LIBOR loans. The Credit Agreement has certain financial maintenance tests including a maximum total leverage ratio, a maximum senior secured leverage ratio and a minimum interest coverage ratio, as well as customary affirmative and negative covenants, and events of default. The negative covenants place limits on Griffon's ability to, among other things, incur indebtedness, incur liens, and make restricted payments and investments. Borrowings under the Credit Agreement are guaranteed by Griffon’s material domestic subsidiaries and are secured, on a first priority basis, by substantially all domestic assets of the Company and the guarantors, and a pledge of not greater than 65% of the equity interest in Griffon’s material, first-tier foreign subsidiaries. At March 31, 2020 , there were $183,548 of outstanding borrowings under the Credit Agreement; outstanding standby letters of credit were $21,390 ; and $195,062 was available, subject to certain loan covenants, for borrowing at that date. (c) In August 2016 and as amended on June 30, 2017, Griffon’s ESOP entered into a Term Loan with a bank (the "ESOP Agreement"). The Term Loan interest rate was LIBOR plus 3.00% . The Term Loan required quarterly principal payments of $569 with a balloon payment due at maturity. The Term Loan was secured by shares purchased with the proceeds of the loan and with a lien on a specific amount of Griffon assets (which ranked pari passu with the lien granted on such assets under the Credit Agreement) and was guaranteed by Griffon. On March 13, 2019, the ESOP Term Loan was refinanced with an internal loan from Griffon which was funded with cash and a draw under its Credit Agreement. The internal loan interest rate is fixed at 2.91% , matures in June 2033 and requires quarterly payments of principal, currently $635 , and interest. The internal loan is secured by shares purchased with the proceeds of the loan. The amount outstanding on the internal loan at March 31, 2020 was $31,148 . (d) Two Griffon subsidiaries have finance leases outstanding for real estate located in Troy, Ohio and Ocala, Florida. The leases mature in 2021 and 2025 , respectively, and bear interest at fixed rates of approximately 5.0% and 2.9% , respectively. The Troy, Ohio lease is secured by a mortgage on the real estate and is guaranteed by Griffon. The Ocala, Florida lease contains one five -year renewal option. At March 31, 2020 , $12,364 was outstanding, net of issuance costs. (e) In November 2012, Garant G.P. (“Garant”) entered into a CAD 15,000 ( $10,628 as of March 31, 2020 ) revolving credit facility. The facility accrues interest at LIBOR (USD) or the Bankers Acceptance Rate (CDN) plus 1.3% per annum ( 2.29% LIBOR USD and 2.30% Bankers Acceptance Rate CDN as of March 31, 2020 ). The revolving facility matures in October 2022. Garant is required to maintain a certain minimum equity. At March 31, 2020 , there were no borrowings under the revolving credit facility with CAD 15,000 ( $10,628 as of March 31, 2020 ) available for borrowing. In July 2016 and as amended in March 2019, Griffon Australia Holdings Pty Ltd and its Australian subsidiaries (collectively, "Griffon Australia") entered into an AUD 29,625 term loan, AUD 20,000 revolver and AUD 10,000 receivable purchase facility agreement. The term loan requires quarterly principal payments of AUD 1,250 plus interest with a balloon payment of AUD 13,375 due upon maturity in March 2022, and accrues interest at Bank Bill Swap Bid Rate “BBSY” plus 1.90% per annum ( 2.39% at March 31, 2020 ). As of March 31, 2020 , the term loan had an outstanding balance of AUD 23,375 ( $14,378 as of March 31, 2020 ). The revolving facility and receivable purchase facility mature in March 2022, but are renewable upon mutual agreement with the lender. The revolving facility and receivable purchase facility accrue interest at BBSY plus 1.8% and 1.25% , respectively, per annum ( 2.20% and 1.65% , respectively, at March 31, 2020 ). At March 31, 2020 , there were no borrowings under the revolver and the receivable purchase facilities had an outstanding balance of AUD 10,000 ( $6,151 as of March 31, 2020 ). The revolver, receivable purchase facility and the term loan are all secured by substantially all of the assets of Griffon Australia and its subsidiaries. Griffon Australia is required to maintain a certain minimum equity level and is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. In July 2018, the AMES Companies UK Ltd and its subsidiaries (collectively, "AMES UK") entered into a GBP 14,000 term loan, GBP 4,000 mortgage loan and GBP 5,000 revolver. The term loan and mortgage loan require quarterly principal payments of GBP 350 and GBP 83 plus interest, respectively, and have balloon payments due upon maturity, July 2023, of GBP 7,000 and GBP 2,333 , respectively. The Term Loan and Mortgage Loans accrue interest at the GBP LIBOR Rate plus 2.25% and 1.8% , respectively ( 2.49% and 2.04% at March 31, 2020 , respectively). The revolving facility matures in June 2020, but is renewable upon mutual agreement with the lender, and accrues interest at the Bank of England Base Rate plus 1.5% ( 1.60% as of March 31, 2020 ). As of March 31, 2020 , the revolver had an outstanding balance of GBP 2,728 ( $3,381 as of March 31, 2020 ) while the term and mortgage loan balances amounted to GBP 15,398 ( $19,084 as of March 31, 2020). The revolver and the term loan are both secured by substantially all of the assets of AMES UK and its subsidiaries. AMES UK is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. An invoice discounting arrangement was canceled and replaced by the above loan facilities. (f) Other long-term debt primarily consists of a loan with the Pennsylvania Industrial Development Authority, with the balance consisting of capital leases. At March 31, 2020 , Griffon and its subsidiaries were in compliance with the terms and covenants of all credit and loan agreements.
Summary of Interest Expense Incurred	Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Debt Issuance Costs Total Interest Expense Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Total Interest Expense Senior notes due 2028 (a) 6.0 % $ 5,566 $ — $ 135 $ 5,701 n/a $ — $ — $ — $ — Senior notes due 2022 (a) 5.7 % 8,040 45 628 8,713 5.7 % 13,125 66 951 14,142 Revolver due 2025 (b) Variable 1,819 — 165 1,984 Variable 1,631 — 400 2,031 ESOP Loans (c) n/a — — — — 7.2 % 449 — 155 604 Capital lease - real estate (d) 6.1 % 52 — 7 59 5.6 % 101 — 6 107 Non US lines of credit (e) Variable 3 — 8 11 Variable 4 — 4 8 Non US term loans (e) Variable 292 — 7 299 Variable 449 — 26 475 Other long term debt (f) Variable 132 — — 132 Variable 147 — 3 150 Capitalized interest (28 ) — — (28 ) — — — — Totals $ 15,876 $ 45 $ 950 $ 16,871 $ 15,906 $ 66 $ 1,545 $ 17,517 (1) n/a = not applicable Six Months Ended March 31, 2020 Six Months Ended March 31, 2019 Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Debt Issuance Costs Total Interest Expense Effective Interest Rate (1) Cash Interest Amort. Debt Amort. Total Interest Expense Senior notes due 2028 (a) 6.0 % $ 5,566 $ — $ 135 $ 5,701 — % $ — $ — $ — $ — Senior notes due 2022 (a) 5.6 % 21,165 112 1,579 22,856 5.7 % 26,250 134 1,902 28,286 Revolver due 2021 (b) Variable 3,201 — 397 3,598 Variable 2,564 — 541 3,105 ESOP Loans (c) n/a — — — — 6.6 % 937 — 186 1,123 Capital lease - real estate (d) 6.0 % 113 — 13 126 5.5 % 216 — 12 228 Non US lines of credit (e) Variable 7 — 12 19 Variable 11 — 8 19 Non US term loans (e) Variable 564 — 19 583 Variable 897 — 53 950 Other long term debt (f) Variable 292 — — 292 Variable 329 — 6 335 Capitalized interest (93 ) — — (93 ) — — — — Totals $ 30,815 $ 112 $ 2,155 $ 33,082 $ 31,204 $ 134 $ 2,708 $ 34,046 (a) On February 19, 2020, in an unregistered offering through a private placement under Rule 144A and Regulation S, Griffon issued, at par, $850,000 of 5.75% Senior Notes due 2028 (the “2028 Senior Notes”). Proceeds from the 2028 Senior Notes were used to redeem 85% of the $1,000,000 of 5.25% Senior Notes due 2022 (the “2022 Senior Notes" and, collectively with the 2028 Senior Notes, the "Senior Notes"). Following the sale and issuance of the 2028 Notes transaction, $150,000 aggregate principal amount of the 2022 Notes remained outstanding. As of March 31, 2020 , outstanding Senior Notes due totaled $1,000,000 ; interest is payable semi-annually on March 1 and September 1. The Senior Notes are senior unsecured obligations of Griffon guaranteed by certain domestic subsidiaries, and subject to certain covenants, limitations and restrictions. On April 22, 2020, Griffon exchanged substantially all of the 2028 Senior Notes for substantially identical 2028 Senior Notes registered under the Securities Act of 1933 (the "Securities Act") via an exchange offer. The remaining 2022 Senior Notes outstanding are registered under the Securities Act, having been issued pursuant to similar prior exchange offers. The fair value of the 2022 and 2028 Senior Notes approximated $139,500 and $799,000 , respectively, on March 31, 2020 based upon quoted market prices (level 1 inputs). In connection with these transactions, Griffon capitalized $12,989 of underwriting fees and other expenses incurred related to the issuance and exchange of the 2028 Senior Notes. Furthermore, 85% of the obligations associated with the 2022 Senior Notes were discharged leaving remaining fees of $1,145 . At March 31, 2020 , a combined total amount of $13,952 remained to be amortized. Remaining capitalized fees for the 2022 Senior Notes and all capitalized fees for the 2028 Senior Notes will amortize over the term of each respective note. Additionally, Griffon recognized a $6,690 loss on the early extinguishment of debt on 85% of the 5.25% $1,000,000 senior notes due 2022, comprised primarily of the write-off of $5,873 of remaining deferred financing fees, $607 of tender offer net premium expense and $210 of redemption interest expense. (b) On January 30, 2020, Griffon amended its revolving credit facility (as amended, the "Credit Agreement") to increase the maximum borrowing availability from $350,000 to $400,000 and extend its maturity date from March 22, 2021 to March 22, 2025, except that if the 2022 Senior Notes are not repaid, refinanced or replaced prior to December 1, 2021, then the Credit Agreement will mature on December 1, 2021. The amended agreement also modified certain other provisions of the facility. The facility includes a letter of credit sub-facility with a limit of $100,000 (increased from $50,000 ); a multi-currency sub-facility of $200,000 (increased from $100,000 ); and contains a customary accordion feature that permits us to request, subject to each lender's consent, an increase in the maximum aggregate amount that can be borrowed by up to an additional $100,000 (increased from $50,000 ). Borrowings under the Credit Agreement may be repaid and re-borrowed at any time. Interest is payable on borrowings at either a LIBOR or base rate benchmark rate, plus an applicable margin, which adjusts based on financial performance. Current margins are 1.00% for base rate loans and 2.00% for LIBOR loans. The Credit Agreement has certain financial maintenance tests including a maximum total leverage ratio, a maximum senior secured leverage ratio and a minimum interest coverage ratio, as well as customary affirmative and negative covenants, and events of default. The negative covenants place limits on Griffon's ability to, among other things, incur indebtedness, incur liens, and make restricted payments and investments. Borrowings under the Credit Agreement are guaranteed by Griffon’s material domestic subsidiaries and are secured, on a first priority basis, by substantially all domestic assets of the Company and the guarantors, and a pledge of not greater than 65% of the equity interest in Griffon’s material, first-tier foreign subsidiaries. At March 31, 2020 , there were $183,548 of outstanding borrowings under the Credit Agreement; outstanding standby letters of credit were $21,390 ; and $195,062 was available, subject to certain loan covenants, for borrowing at that date. (c) In August 2016 and as amended on June 30, 2017, Griffon’s ESOP entered into a Term Loan with a bank (the "ESOP Agreement"). The Term Loan interest rate was LIBOR plus 3.00% . The Term Loan required quarterly principal payments of $569 with a balloon payment due at maturity. The Term Loan was secured by shares purchased with the proceeds of the loan and with a lien on a specific amount of Griffon assets (which ranked pari passu with the lien granted on such assets under the Credit Agreement) and was guaranteed by Griffon. On March 13, 2019, the ESOP Term Loan was refinanced with an internal loan from Griffon which was funded with cash and a draw under its Credit Agreement. The internal loan interest rate is fixed at 2.91% , matures in June 2033 and requires quarterly payments of principal, currently $635 , and interest. The internal loan is secured by shares purchased with the proceeds of the loan. The amount outstanding on the internal loan at March 31, 2020 was $31,148 . (d) Two Griffon subsidiaries have finance leases outstanding for real estate located in Troy, Ohio and Ocala, Florida. The leases mature in 2021 and 2025 , respectively, and bear interest at fixed rates of approximately 5.0% and 2.9% , respectively. The Troy, Ohio lease is secured by a mortgage on the real estate and is guaranteed by Griffon. The Ocala, Florida lease contains one five -year renewal option. At March 31, 2020 , $12,364 was outstanding, net of issuance costs. (e) In November 2012, Garant G.P. (“Garant”) entered into a CAD 15,000 ( $10,628 as of March 31, 2020 ) revolving credit facility. The facility accrues interest at LIBOR (USD) or the Bankers Acceptance Rate (CDN) plus 1.3% per annum ( 2.29% LIBOR USD and 2.30% Bankers Acceptance Rate CDN as of March 31, 2020 ). The revolving facility matures in October 2022. Garant is required to maintain a certain minimum equity. At March 31, 2020 , there were no borrowings under the revolving credit facility with CAD 15,000 ( $10,628 as of March 31, 2020 ) available for borrowing. In July 2016 and as amended in March 2019, Griffon Australia Holdings Pty Ltd and its Australian subsidiaries (collectively, "Griffon Australia") entered into an AUD 29,625 term loan, AUD 20,000 revolver and AUD 10,000 receivable purchase facility agreement. The term loan requires quarterly principal payments of AUD 1,250 plus interest with a balloon payment of AUD 13,375 due upon maturity in March 2022, and accrues interest at Bank Bill Swap Bid Rate “BBSY” plus 1.90% per annum ( 2.39% at March 31, 2020 ). As of March 31, 2020 , the term loan had an outstanding balance of AUD 23,375 ( $14,378 as of March 31, 2020 ). The revolving facility and receivable purchase facility mature in March 2022, but are renewable upon mutual agreement with the lender. The revolving facility and receivable purchase facility accrue interest at BBSY plus 1.8% and 1.25% , respectively, per annum ( 2.20% and 1.65% , respectively, at March 31, 2020 ). At March 31, 2020 , there were no borrowings under the revolver and the receivable purchase facilities had an outstanding balance of AUD 10,000 ( $6,151 as of March 31, 2020 ). The revolver, receivable purchase facility and the term loan are all secured by substantially all of the assets of Griffon Australia and its subsidiaries. Griffon Australia is required to maintain a certain minimum equity level and is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. In July 2018, the AMES Companies UK Ltd and its subsidiaries (collectively, "AMES UK") entered into a GBP 14,000 term loan, GBP 4,000 mortgage loan and GBP 5,000 revolver. The term loan and mortgage loan require quarterly principal payments of GBP 350 and GBP 83 plus interest, respectively, and have balloon payments due upon maturity, July 2023, of GBP 7,000 and GBP 2,333 , respectively. The Term Loan and Mortgage Loans accrue interest at the GBP LIBOR Rate plus 2.25% and 1.8% , respectively ( 2.49% and 2.04% at March 31, 2020 , respectively). The revolving facility matures in June 2020, but is renewable upon mutual agreement with the lender, and accrues interest at the Bank of England Base Rate plus 1.5% ( 1.60% as of March 31, 2020 ). As of March 31, 2020 , the revolver had an outstanding balance of GBP 2,728 ( $3,381 as of March 31, 2020 ) while the term and mortgage loan balances amounted to GBP 15,398 ( $19,084 as of March 31, 2020). The revolver and the term loan are both secured by substantially all of the assets of AMES UK and its subsidiaries. AMES UK is subject to a maximum leverage ratio and a minimum fixed charges cover ratio. An invoice discounting arrangement was canceled and replaced by the above loan facilities. (f) Other long-term debt primarily consists of a loan with the Pennsylvania Industrial Development Authority, with the balance consisting of capital leases. At March 31, 2020 , Griffon and its subsidiaries were in compliance with the terms and covenants of all credit and loan agreements.

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	6 Months Ended
	Mar. 31, 2020
Stockholders' Equity Note [Abstract]
Compensation Expense Relating to Stock-based Incentive Plans	The following table summarizes the Company’s compensation expense relating to all stock-based incentive plans: For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Restricted stock $ 3,662 $ 3,422 $ 6,812 $ 6,355 ESOP 658 492 1,490 1,145 Total stock based compensation $ 4,320 $ 3,914 $ 8,302 $ 7,500

EARNINGS PER SHARE (EPS) (Table

EARNINGS PER SHARE (EPS) (Tables)	6 Months Ended
	Mar. 31, 2020
Earnings Per Share [Abstract]
Summary of Reconciliation of Share Amounts Used in Earnings Per Share	The following table is a reconciliation of the share amounts (in thousands) used in computing earnings per share: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Common shares outstanding 47,431 46,800 47,431 46,800 Unallocated ESOP shares (2,159 ) (2,409 ) (2,159 ) (2,409 ) Non-vested restricted stock (3,562 ) (3,427 ) (3,562 ) (3,427 ) Impact on weighted average shares (145 ) (15 ) (341 ) (115 ) Weighted average shares outstanding - basic 41,565 40,949 41,369 40,849 Incremental shares from stock based compensation 2,169 1,883 2,457 1,527 Weighted average shares outstanding - diluted 43,734 42,832 43,826 42,376

BUSINESS SEGMENTS (Tables)

BUSINESS SEGMENTS (Tables)	6 Months Ended
	Mar. 31, 2020
Segment Reporting [Abstract]
Summary of Reportable Segments from Continuing Operations	Information on Griffon’s reportable segments from continuing operations is as follows: For the Three Months Ended March 31, For the Six Months Ended March 31, REVENUE 2020 2019 2020 2019 Consumer and Professional Products $ 274,912 $ 287,732 $ 515,988 $ 504,206 Home and Building Products 209,829 186,799 451,210 410,094 Defense Electronics 81,609 75,102 147,590 145,855 Total consolidated net sales $ 566,350 $ 549,633 $ 1,114,788 $ 1,060,155 For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Segment adjusted EBITDA: Consumer and Professional Products $ 25,027 $ 28,616 $ 46,953 $ 49,181 Home and Building Products 30,635 20,137 71,336 51,432 Defense Electronics 4,248 4,936 8,723 9,721 Segment adjusted EBITDA 59,910 53,689 127,012 110,334 Unallocated amounts, excluding depreciation (11,947 ) (11,208 ) (23,889 ) (22,472 ) Adjusted EBITDA 47,963 42,481 103,123 87,862 Net interest expense (16,561 ) (17,305 ) (32,511 ) (33,636 ) Depreciation and amortization (15,719 ) (15,492 ) (31,544 ) (30,577 ) Loss from debt extinguishment (6,690 ) — (6,690 ) — Restructuring charges (3,104 ) — (9,538 ) — Acquisition costs (2,960 ) — (2,960 ) — Income before taxes from continuing operations $ 2,929 $ 9,684 $ 19,880 $ 23,649 Unallocated amounts typically include general corporate expenses not attributable to a reportable segment. For the Three Months Ended March 31, For the Six Months Ended March 31, DEPRECIATION and AMORTIZATION 2020 2019 2020 2019 Segment: Consumer and Professional Products $ 8,222 $ 8,184 $ 16,453 $ 15,990 Home and Building Products 4,668 4,548 9,468 9,057 Defense Electronics 2,676 2,621 5,320 5,257 Total segment depreciation and amortization 15,566 15,353 31,241 30,304 Corporate 153 139 303 273 Total consolidated depreciation and amortization $ 15,719 $ 15,492 $ 31,544 $ 30,577 CAPITAL EXPENDITURES Segment: Consumer and Professional Products $ 3,800 $ 3,806 $ 7,532 $ 8,140 Home and Building Products 3,556 2,524 11,495 5,335 Defense Electronics 1,921 2,499 3,210 3,733 Total segment 9,277 8,829 22,237 17,208 Corporate 70 192 282 210 Total consolidated capital expenditures $ 9,347 $ 9,021 $ 22,519 $ 17,418 ASSETS At March 31, 2020 At September 30, 2019 Segment assets: Consumer and Professional Products $ 1,279,376 $ 1,070,510 Home and Building Products 592,011 571,216 Defense Electronics 348,081 347,575 Total segment assets 2,219,468 1,989,301 Corporate 96,085 82,429 Total continuing assets 2,315,553 2,071,730 Assets of discontinued operations 3,194 3,209 Consolidated total $ 2,318,747 $ 2,074,939
Summary of Disaggregation of Revenue by End Market and Segment	The following table presents revenue disaggregated by end market and segment: For the Three Months Ended March 31, For the Six Months Ended March 31, 2020 2019 2020 2019 Residential repair and remodel $ 40,505 $ 38,441 $ 75,595 $ 65,599 Retail 144,904 162,576 264,524 275,941 Residential new construction 14,884 13,545 29,857 27,817 Industrial 10,535 11,416 21,158 21,174 International excluding North America 64,084 61,754 124,854 113,675 Total Consumer and Professional Products 274,912 287,732 515,988 504,206 Residential repair and remodel 100,808 90,271 222,805 203,638 Commercial construction 86,300 76,181 178,187 160,557 Residential new construction 22,721 20,347 50,218 45,899 Total Home and Building Products 209,829 186,799 451,210 410,094 U.S. Government 53,623 46,376 96,324 91,936 International 25,021 23,129 43,554 45,228 Commercial 2,965 5,597 7,712 8,691 Total Defense Electronics 81,609 75,102 147,590 145,855 Total Consolidated Revenue $ 566,350 $ 549,633 $ 1,114,788 $ 1,060,155 The following table presents revenue disaggregated by geography based on the location of the Company's customer: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 REVENUE BY GEOGRAPHIC AREA - DESTINATION CPP HBP Defense Electronics Total CPP HBP Defense Electronics Total United States $ 191,412 $ 199,060 $ 55,071 $ 445,543 $ 351,570 $ 426,010 $ 101,214 $ 878,794 Europe 24,737 5 9,880 34,622 31,342 28 15,865 47,235 Canada 17,515 7,867 4,209 29,591 35,296 19,120 6,783 61,199 Australia 39,032 — 189 39,221 93,260 — 795 94,055 All other countries 2,216 2,897 12,260 17,373 4,520 6,052 22,933 33,505 Consolidated revenue $ 274,912 $ 209,829 $ 81,609 $ 566,350 $ 515,988 $ 451,210 $ 147,590 $ 1,114,788 For the Three Months Ended March 31, 2019 For the Six Months Ended March 31, 2019 REVENUE BY GEOGRAPHIC AREA - DESTINATION CPP HBP Defense Electronics Total CPP HBP Defense Electronics Total United States $ 204,445 $ 175,945 $ 51,179 $ 431,569 $ 347,361 $ 385,772 $ 99,474 $ 832,607 Europe 20,343 29 8,490 28,862 28,208 46 18,801 47,055 Canada 18,845 6,984 3,058 28,887 38,210 17,965 5,687 61,862 Australia 41,749 266 979 42,994 85,788 450 1,588 87,826 All other countries 2,350 3,575 11,396 17,321 4,639 5,861 20,305 30,805 Consolidated revenue $ 287,732 $ 186,799 $ 75,102 $ 549,633 $ 504,206 $ 410,094 $ 145,855 $ 1,060,155

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	6 Months Ended
	Mar. 31, 2020
Retirement Benefits [Abstract]
Summary of Defined Benefit Plans Included in Other Income	Defined benefit pension expense (income) included in Other Income (Expense), net was as follows: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Interest cost $ 1,151 $ 1,571 $ 2,302 $ 3,141 Expected return on plan assets (2,586 ) (2,583 ) (5,172 ) (5,166 ) Amortization: Prior service cost 4 3 8 7 Recognized actuarial loss 1,042 222 2,084 444 Net periodic expense (income) $ (389 ) $ (787 ) $ (778 ) $ (1,574 )

DISCONTINUED OPERATIONS (Tables

DISCONTINUED OPERATIONS (Tables)	6 Months Ended
	Mar. 31, 2020
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following amounts summarize the total assets and liabilities of Plastics and Installation Services and other discontinued activities which have been segregated from Griffon’s continuing operations, and are reported as assets and liabilities of discontinued operations in the Condensed Consolidated Balance Sheets: At March 31, 2020 At September 30, 2019 Assets of discontinued operations: Prepaid and other current assets $ 321 $ 321 Other long-term assets 2,873 2,888 Total assets of discontinued operations $ 3,194 $ 3,209 Liabilities of discontinued operations: Accrued liabilities, current $ 2,450 $ 4,333 Other long-term liabilities 3,154 3,331 Total liabilities of discontinued operations $ 5,604 $ 7,664

RESTRUCTURING CHARGES (Tables)

RESTRUCTURING CHARGES (Tables)	6 Months Ended
	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Summary of the Restructuring and Other Related Charges	A summary of the restructuring and other related charges included in Cost of goods and services and Selling, general and administrative expenses in the Company's Condensed Consolidated Statements of Operations were as follows: For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Cost of goods and services $ 1,353 $ 4,076 Selling, general and administrative expenses 1,751 5,462 Total restructuring charges $ 3,104 $ 9,538 For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Personnel related costs $ 1,658 $ 3,792 Facilities, exit costs and other 914 1,054 Non-cash facility and other 532 4,692 Total $ 3,104 $ 9,538
Summary of Accrued Liability for the Restructuring and Related Charges	The following table summarizes the accrued liabilities of the Company's restructuring actions: Cash Charges Non-Cash Personnel related costs Facilities & Facility and Other Costs Total Accrued liability at September 30, 2019 $ — $ — $ — $ — Q1 restructuring charges 2,134 140 4,160 6,434 Cash payments (621 ) (140 ) — (761 ) Non-cash charges (1) — — (4,160 ) (4,160 ) Accrued liability at December 31, 2019 $ 1,513 $ — $ — $ 1,513 Q2 restructuring charges 1,658 914 532 3,104 Cash payments (1,041 ) (914 ) — (1,955 ) Non-cash charges (1) — — (532 ) (532 ) Accrued liability at March 31, 2020 $ 2,130 $ — $ — $ 2,130 (1) Non-cash charges in Facility and Other Costs primarily represent the non-cash write-off of certain long-lived assets in connection with certain facility closures.

WARRANTY LIABILITY (Tables)

WARRANTY LIABILITY (Tables)	6 Months Ended
	Mar. 31, 2020
Product Warranties Disclosures [Abstract]
Summary of Changes in Warranty Liability, Included in Accrued Liabilities	Changes in Griffon’s warranty liability, included in Accrued liabilities, were as follows: Three Months Ended March 31, Six Months Ended March 31, 2020 2019 2020 2019 Balance, beginning of period $ 7,344 $ 9,041 $ 7,894 $ 8,174 Warranties issued and changes in estimated pre-existing warranties 4,862 4,700 8,227 8,761 Actual warranty costs incurred (4,417 ) (5,730 ) (8,332 ) (8,924 ) Balance, end of period $ 7,789 $ 8,011 $ 7,789 $ 8,011

OTHER COMPREHENSIVE INCOME (L_2

OTHER COMPREHENSIVE INCOME (LOSS) (Tables)	6 Months Ended
	Mar. 31, 2020
OCI, Net of Tax [Abstract]
Summary of Comprehensive Income (Loss)	The amounts recognized in other comprehensive income (loss) were as follows: Three Months Ended March 31, 2020 Three Months Ended March 31, 2019 Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation adjustments $ (16,471 ) $ — $ (16,471 ) $ 2,885 $ — $ 2,885 Pension and other defined benefit plans 847 (178 ) 669 201 (17 ) 184 Cash flow hedges 1,383 (415 ) 968 (264 ) 75 (189 ) Total other comprehensive income (loss) $ (14,241 ) $ (593 ) $ (14,834 ) $ 2,822 $ 58 $ 2,880 Six Months Ended March 31, 2020 Six Months Ended March 31, 2019 Pre-tax Tax Net of tax Pre-tax Tax Net of tax Foreign currency translation adjustments $ (10,001 ) $ — $ (10,001 ) $ (2,851 ) $ — $ (2,851 ) Pension and other defined benefit plans 1,694 (353 ) 1,341 472 (104 ) 368 Cash flow hedges 953 (286 ) 667 (107 ) 20 (87 ) Total other comprehensive income (loss) $ (7,354 ) $ (639 ) $ (7,993 ) $ (2,486 ) $ (84 ) $ (2,570 ) The components of Accumulated other comprehensive income (loss) are as follows: At March 31, 2020 At September 30, 2019 Foreign currency translation adjustments $ (41,285 ) $ (31,284 ) Pension and other defined benefit plans (33,473 ) (34,814 ) Change in Cash flow hedges 849 182 $ (73,909 ) $ (65,916 )
Reclassification from Accumulated Other Comprehensive Income (Loss)	Amounts reclassified from accumulated other comprehensive income (loss) to income were as follows: For the Three Months Ended March 31, For the Six Months Ended March 31, Gain (Loss) 2020 2019 2020 2019 Pension amortization $ (1,046 ) $ (225 ) $ (2,092 ) $ (451 ) Cash flow hedges 1,050 310 994 992 Total gain (loss) $ 4 $ 85 (1,098 ) 541 Tax benefit (expense) (1 ) (18 ) 231 (114 ) Total $ 3 $ 67 $ (867 ) $ 427

LEASES (Tables)

LEASES (Tables)	6 Months Ended
	Mar. 31, 2020
Leases [Abstract]
Components of Operating Lease Cost, Cash Flow Information, and Average Lease Terms and Discount Rates	Supplemental cash flow information were as follows: For the Six Months ended March 31, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 21,582 Financing cash flows from finance leases 1,940 Total $ 23,522 For the Three Months Ended March 31, 2020 For the Six Months Ended March 31, 2020 Fixed $ 9,187 $ 18,739 Variable (a), (b) 1,823 3,576 Short-term (b) 1,393 2,823 Total* $ 12,403 $ 25,138 (a) Primarily related to common-area maintenance and property taxes. (b) Not recorded on the balance sheet. Average lease terms and discount rates were as follows: At March 31, 2020 Weighted-average remaining lease term (years) Operating leases 8.8 Finance Leases 2.1 Weighted-average discount rate Operating Leases 4.10 % Finance Leases 5.50 %
Supplemental Condensed Consolidated Balance Sheet Information	Supplemental Condensed Consolidated Balance Sheet information related to leases were as follows: At March 31, 2020 Operating Leases: Right of use assets: Operating right-of-use assets $ 156,258 Lease Liabilities: Current portion of operating lease liabilities $ 28,047 Long-term operating lease liabilities 133,498 Total operating lease liabilities $ 161,545 Finance Leases: Property, plant and equipment, net (1) $ 14,059 Lease Liabilities: Notes payable and current portion of long-term debt $ 4,014 Long-term debt, net 10,074 Total financing lease liabilities $ 14,088 (1) Finance lease assets are recorded net of accumulated depreciation of $1,946 .
Aggregate Future Maturities of Lease Payments for Operating Leases	The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2020 are as follows (in thousands): Operating Leases Finance Leases 2020 (a) $ 17,505 $ 2,452 2021 33,312 4,164 2022 28,570 2,607 2023 22,261 2,315 2024 16,467 2,074 2025 14,334 1,383 Thereafter 72,614 — Total lease payments 205,063 14,995 Less: Imputed Interest (43,518 ) (907 ) Present value of lease liabilities $ 161,545 $ 14,088 (a) Excluding the six months ended March 31, 2020
Aggregate Future Maturities of Lease Payments for Finance Leases	The aggregate future maturities of lease payments for operating leases and finance leases as of March 31, 2020 are as follows (in thousands): Operating Leases Finance Leases 2020 (a) $ 17,505 $ 2,452 2021 33,312 4,164 2022 28,570 2,607 2023 22,261 2,315 2024 16,467 2,074 2025 14,334 1,383 Thereafter 72,614 — Total lease payments 205,063 14,995 Less: Imputed Interest (43,518 ) (907 ) Present value of lease liabilities $ 161,545 $ 14,088 (a) Excluding the six months ended March 31, 2020
Minimum Lease Payments for Operating Leases, Prior to ASU 2016-02 Adoption	The aggregate minimum lease payments for operating leases, as calculated prior to the adoption of ASU 2016-02, were as follows: At September 30, 2019 2020 $ 35,176 2021 30,730 2022 26,119 2023 20,008 2024 14,198 Thereafter 78,105 Total $ 204,336

CONSOLIDATING GUARANTOR AND N_2

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION (Tables)	6 Months Ended
	Mar. 31, 2020
Consolidating Guarantor And Non Guarantor Financial Information [Abstract]
Condensed Consolidating Balance Sheets	CONDENSED CONSOLIDATING BALANCE SHEETS At March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CURRENT ASSETS Cash and equivalents $ 9,252 $ 18,977 $ 40,795 $ — $ 69,024 Accounts receivable, net of allowances — 283,929 206,456 (155,352 ) 335,033 Contract costs and recognized income not yet billed, net of progress payments — 91,998 2,497 — 94,495 Inventories, net — 391,934 70,756 (571 ) 462,119 Prepaid and other current assets 11,482 23,468 5,149 2,624 42,723 Assets of discontinued operations — — 321 — 321 Total Current Assets 20,734 810,306 325,974 (153,299 ) 1,003,715 PROPERTY, PLANT AND EQUIPMENT, net 1,295 290,685 43,840 — 335,820 OPERATING LEASE RIGHT-OF-USE ASSETS 10,060 127,133 19,065 — 156,258 GOODWILL — 375,734 61,048 — 436,782 INTANGIBLE ASSETS, net 93 220,796 132,854 — 353,743 INTERCOMPANY RECEIVABLE 67,266 928,899 148,568 (1,144,733 ) — EQUITY INVESTMENTS IN SUBSIDIARIES 1,658,792 745,746 3,109,559 (5,514,097 ) — OTHER ASSETS 8,695 37,669 (2,446 ) (14,362 ) 29,556 ASSETS OF DISCONTINUED OPERATIONS — — 2,873 — 2,873 Total Assets $ 1,766,935 $ 3,536,968 $ 3,841,335 $ (6,826,491 ) $ 2,318,747 CURRENT LIABILITIES Notes payable and current portion of long-term debt $ — $ 3,474 $ 5,996 $ — $ 9,470 Accounts payable and accrued liabilities 28,873 412,118 58,903 (152,741 ) 347,153 Current portion of operating lease liabilities 1,830 22,068 4,149 — 28,047 Liabilities of discontinued operations — — 2,450 — 2,450 Total Current Liabilities 30,703 437,660 71,498 (152,741 ) 387,120 LONG-TERM DEBT, net 1,167,023 10,642 38,561 — 1,216,226 LONG-TERM OPERATING LEASE LIABILITIES 9,353 108,872 15,273 — 133,498 INTERCOMPANY PAYABLES 63,230 563,964 536,815 (1,164,009 ) — OTHER LIABILITIES 20,172 77,292 12,650 (7,819 ) 102,295 LIABILITIES OF DISCONTINUED OPERATIONS — — 3,154 — 3,154 Total Liabilities 1,290,481 1,198,430 677,951 (1,324,569 ) 1,842,293 SHAREHOLDERS’ EQUITY 476,454 2,338,538 3,163,384 (5,501,922 ) 476,454 Total Liabilities and Shareholders’ Equity $ 1,766,935 $ 3,536,968 $ 3,841,335 $ (6,826,491 ) $ 2,318,747 CONDENSED CONSOLIDATING BALANCE SHEETS At September 30, 2019 ($ in thousands) Parent Guarantor Non-Guarantor Elimination Consolidation CURRENT ASSETS Cash and equivalents $ 1,649 $ 25,217 $ 45,511 $ — $ 72,377 Accounts receivable, net of allowances — 227,069 38,580 (1,199 ) 264,450 Contract costs and recognized income not yet billed, net of progress payments — 104,109 1,002 — 105,111 Inventories, net — 372,839 69,540 (258 ) 442,121 Prepaid and other current assets 8,238 25,754 6,951 (144 ) 40,799 Assets of discontinued operations — — 321 — 321 Total Current Assets 9,887 754,988 161,905 (1,601 ) 925,179 PROPERTY, PLANT AND EQUIPMENT, net 1,184 289,282 46,860 — 337,326 GOODWILL — 375,734 61,333 — 437,067 INTANGIBLE ASSETS, net 93 224,275 132,271 — 356,639 INTERCOMPANY RECEIVABLE 5,834 864,884 75,684 (946,402 ) — EQUITY INVESTMENTS IN SUBSIDIARIES 1,628,031 581,438 3,233,038 (5,442,507 ) — OTHER ASSETS 8,182 24,635 (2,352 ) (14,625 ) 15,840 ASSETS OF DISCONTINUED OPERATIONS — — 2,888 — 2,888 Total Assets $ 1,653,211 $ 3,115,236 $ 3,711,627 $ (6,405,135 ) $ 2,074,939 CURRENT LIABILITIES Notes payable and current portion of long-term debt $ — $ 3,075 $ 7,450 $ — $ 10,525 Accounts payable and accrued liabilities 41,796 266,411 68,390 (1,356 ) 375,241 Liabilities of discontinued operations — — 4,333 — 4,333 Total Current Liabilities 41,796 269,486 80,173 (1,356 ) 390,099 LONG-TERM DEBT, net 1,040,449 3,119 50,181 — 1,093,749 INTERCOMPANY PAYABLES 71,634 457,265 444,557 (973,456 ) — OTHER LIABILITIES 21,569 81,582 15,017 (8,171 ) 109,997 LIABILITIES OF DISCONTINUED OPERATIONS — — 3,331 — 3,331 Total Liabilities 1,175,448 811,452 593,259 (982,983 ) 1,597,176 SHAREHOLDERS’ EQUITY 477,763 2,303,784 3,118,368 (5,422,152 ) 477,763 Total Liabilities and Shareholders’ Equity $ 1,653,211 $ 3,115,236 $ 3,711,627 $ (6,405,135 ) $ 2,074,939
Condensed Consolidating Statements of Operations and Comprehensive Income (Loss)	CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation Revenue $ — $ 462,500 $ 113,926 $ (10,076 ) $ 566,350 Cost of goods and services — 345,626 79,112 (10,420 ) 414,318 Gross profit — 116,874 34,814 344 152,032 Selling, general and administrative expenses 7,922 91,338 27,300 (93 ) 126,467 Income (loss) from operations (7,922 ) 25,536 7,514 437 25,565 Other income (expense) Interest income (expense), net (6,880 ) (9,706 ) 25 — (16,561 ) Loss from debt extinguishment, net (6,690 ) — — — (6,690 ) Other, net (418 ) (2,667 ) 4,141 (441 ) 615 Total other income (expense) (13,988 ) (12,373 ) 4,166 (441 ) (22,636 ) Income (loss) before taxes (21,910 ) 13,163 11,680 (4 ) 2,929 Provision (benefit) for income taxes (9,427 ) 6,078 5,387 (4 ) 2,034 Income (loss) before equity in net income of subsidiaries (12,483 ) 7,085 6,293 — 895 Equity in net income (loss) of subsidiaries 13,378 6,341 7,085 (26,804 ) — Net Income (loss) $ 895 $ 13,426 $ 13,378 $ (26,804 ) $ 895 Comprehensive income (loss) $ (13,939 ) $ 8,028 $ 18,776 $ (26,804 ) $ (13,939 ) CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2019 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation Revenue $ — $ 462,739 $ 94,285 $ (7,391 ) $ 549,633 Cost of goods and services — 354,382 65,516 (7,769 ) 412,129 Gross profit — 108,357 28,769 378 137,504 Selling, general and administrative expenses 5,249 84,813 21,409 312 111,783 Income (loss) from operations (5,249 ) 23,544 7,360 66 25,721 Other income (expense) Interest income (expense), net (7,328 ) (9,128 ) (849 ) — (17,305 ) Other, net (473 ) 1,129 676 (64 ) 1,268 Total other income (expense) (7,801 ) (7,999 ) (173 ) (64 ) (16,037 ) Income (loss) before taxes (13,050 ) 15,545 7,187 2 9,684 Provision (benefit) for income taxes (4,242 ) 5,292 2,142 2 3,194 Income (loss) before equity in net income of subsidiaries (8,808 ) 10,253 5,045 — 6,490 Equity in net income (loss) of subsidiaries 7,652 11,646 10,253 (29,551 ) — Income (loss) from continuing operations (1,156 ) 21,899 15,298 (29,551 ) 6,490 Income (loss) from operation of discontinued businesses — — (11,000 ) — (11,000 ) Provision (benefit) from income taxes — — (3,354 ) — (3,354 ) Income (loss) from discontinued operations — — (7,646 ) — (7,646 ) Net Income (loss) $ (1,156 ) $ 21,899 $ 7,652 $ (29,551 ) $ (1,156 ) Comprehensive income (loss) $ 1,724 $ 5,448 $ 8,736 $ (14,184 ) $ 1,724
Condensed Consolidating Statements of Cash Flows	CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Six Months Ended March 31, 2020 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 11,507 $ 32,202 $ 32,034 $ (64,236 ) $ 11,507 Net cash provided by (used in) operating activities: (92,042 ) 26,593 4,606 — (60,843 ) CASH FLOWS FROM INVESTING ACTIVITIES: Acquisition of property, plant and equipment (282 ) (19,982 ) (2,255 ) — (22,519 ) Acquired businesses, net of cash acquired — — (10,531 ) — (10,531 ) Proceeds from sale of assets — 292 (2 ) — 290 Net cash provided by (used in) investing activities (282 ) (19,690 ) (12,788 ) — (32,760 ) CASH FLOWS FROM FINANCING ACTIVITIES: Purchase of shares for treasury (7,479 ) — — — (7,479 ) Proceeds from long-term debt 1,054,636 — 6,707 — 1,061,343 Payments of long-term debt (921,904 ) (1,752 ) (15,415 ) — (939,071 ) Financing costs (13,176 ) — — — (13,176 ) Dividends paid (7,349 ) — — — (7,349 ) Other, net (4,801 ) (10,839 ) 15,723 — 83 Net cash provided by (used in) financing activities 99,927 (12,591 ) 7,015 — 94,351 CASH FLOWS FROM DISCONTINUED OPERATIONS: Net cash provided by (used) in discontinued operations — — (1,994 ) — (1,994 ) Effect of exchange rate changes on cash and equivalents — (552 ) (1,555 ) — (2,107 ) NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS 7,603 (6,240 ) (4,716 ) — (3,353 ) CASH AND EQUIVALENTS AT BEGINNING OF PERIOD 1,649 25,217 45,511 — 72,377 CASH AND EQUIVALENTS AT END OF PERIOD $ 9,252 $ 18,977 $ 40,795 $ — $ 69,024 CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Six Months Ended March 31, 2019 ($ in thousands) Parent Company Guarantor Companies Non-Guarantor Companies Elimination Consolidation CASH FLOWS FROM OPERATING ACTIVITIES: Net income (loss) $ 7,597 $ 38,703 $ 24,499 $ (63,202 ) $ 7,597 Net (income) loss from discontinued operations — — 7,646 — 7,646 Net cash provided by (used in) operating activities: (77,881 ) 24,130 (1,255 ) — (55,006 ) CASH FLOWS FROM INVESTING ACTIVITIES: Acquisition of property, plant and equipment (210 ) (14,071 ) (3,137 ) — (17,418 ) Acquired businesses, net of cash acquired (9,219 ) — — — (9,219 ) Investment purchases (149 ) — — — (149 ) Insurance payments (10,604 ) — — — (10,604 ) Proceeds from sale of assets — 36 26 — 62 Net cash provided by (used in) investing activities (20,182 ) (14,035 ) (3,111 ) — (37,328 ) CASH FLOWS FROM FINANCING ACTIVITIES: Purchase of shares for treasury (1,478 ) — — — (1,478 ) Proceeds from long-term debt 130,484 76 12,541 — 143,101 Payments of long-term debt (32,419 ) (1,724 ) (14,026 ) — (48,169 ) Contingent consideration for acquired businesses — — (1,686 ) — (1,686 ) Financing costs (945 ) — — — (945 ) Dividends paid (6,847 ) — — — (6,847 ) Other, net (1,641 ) 7,150 (5,426 ) — 83 Net cash provided by (used in) financing activities 87,154 5,502 (8,597 ) — 84,059 CASH FLOWS FROM DISCONTINUED OPERATIONS: Net cash provided by (used in) discontinued operations — — (3,438 ) — (3,438 ) Effect of exchange rate changes on cash and equivalents — (92 ) 26 — (66 ) NET INCREASE (DECREASE) IN CASH AND EQUIVALENTS (10,909 ) 15,505 (16,375 ) — (11,779 ) CASH AND EQUIVALENTS AT BEGINNING OF PERIOD 15,976 16,353 37,429 — 69,758 CASH AND EQUIVALENTS AT END OF PERIOD $ 5,067 $ 31,858 $ 21,054 $ — $ 57,979

DESCRIPTION OF BUSINESS AND B_3

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Details)	6 Months Ended
	Mar. 31, 2020segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments	3

FAIR VALUE MEASUREMENTS (Detail

FAIR VALUE MEASUREMENTS (Details) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020USD ($)	Mar. 31, 2020USD ($)$ / shares
Australian Dollar Forward Contracts | Cost of goods and services
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain reclassified for settled contracts	$ 1,050	$ 994
Designated as Hedging Instrument | Australian Dollar Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	8,000	$ 8,000
Contracts weighted average rate price (in dollars per share) | $ / shares		$ 1.63
AOCI currency translation adjustment before tax	849	$ 849
AOCI currency translation adjustment after tax	552	$ 552
Designated as Hedging Instrument | Australian Dollar Forward Contracts | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		30 days
Designated as Hedging Instrument | Australian Dollar Forward Contracts | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		90 days
Not Designated as Hedging Instrument | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		30 days
Not Designated as Hedging Instrument | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts duration		180 days
Not Designated as Hedging Instrument | Canadian Dollar Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	$ 3,300	$ 3,300
Derivative, average forward exchange rate	1.41	1.41
Not Designated as Hedging Instrument | British Pound Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset, notional amount	$ 4,350	$ 4,350
Derivative, average forward exchange rate	0.81	0.81
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Insurance contracts fair value	$ 3,382	$ 3,382
Fair Value, Inputs, Level 2 | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gain (loss) on foreign currency derivative instruments not designated as hedging instruments	271	199
Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument | Other Income
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Realized gains (losses)	84	87
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	2,605	2,605
Fair Value, Inputs, Level 2 | Portion at Other than Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities	2,236	2,236
Senior notes due 2022 | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, fair value disclosures	139,500	139,500
Senior notes due 2028 | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible debt, fair value disclosures	$ 799,000	$ 799,000

REVENUE - Narrative (Details)

REVENUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Percentage of performance obligations recognized at a point in time (more than)		80.00%
Percentage of performance obligations recognized over time (less than)		20.00%
Net favorable (unfavorable) catch-up adjustments to income from operations	$ (2,224)	$ (5,243)
Accumulated estimated costs to complete loss contracts	$ 8,560	$ 8,560	$ 9,790

REVENUE - Transaction Price All

REVENUE - Transaction Price Allocated to the Remaining Performance Obligations (Details) $ in Thousands	Mar. 31, 2020USD ($)
Revenue from Contract with Customer [Abstract]
Remaining performance obligations (backlog)	$ 331,740
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations (backlog), percentage to to be satisfied by the end of the year	73.00%
Remaining performance obligations (backlog), expected timing of satisfaction, period	12 months

REVENUE - Contract Balances (De

REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract costs and recognized income not yet billed, net of progress payments	$ 94,495	$ 105,111
Decrease in contract assets balance	10,616
Contract costs and recognized income not yet billed, noncurrent	12,612	13,100
Reserves for contract risk	1,570
Contract liabilities	21,292
Increase (decrease) in contract liabilities	$ (4,967)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract costs and recognized income not yet billed, net of progress payments		105,111
Contract liabilities		$ 26,259

ACQUISITIONS (Details)

ACQUISITIONS (Details) £ in Thousands	Nov. 29, 2019GBP (£)	Nov. 29, 2019USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Sep. 30, 2019USD ($)
Business Acquisition [Line Items]
Goodwill | $			$ 436,782,000		$ 436,782,000		$ 437,067,000
Acquisition related costs | $			$ 2,960,000	$ 0	$ 2,960,000	$ 0
Vatre Group Limited
Business Acquisition [Line Items]
Percentage of outstanding stock acquired	100.00%
Business combination, consideration transferred	£ 8,750	$ 10,500,000
Goodwill	2,418
Intangible assets	3,454
Inventory	2,914
Accounts receivable and other assets	2,492
Accounts payable and accrued liabilities	£ 2,734

INVENTORIES - Summary of Invent

INVENTORIES - Summary of Inventories Stated at Lower Cost (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 122,576	$ 121,791
Work in process	99,730	93,830
Finished goods	239,813	226,500
Total	$ 462,119	$ 442,121

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Summary of Property Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 784,978	$ 763,542
Accumulated depreciation and amortization	(449,158)	(426,216)
Total	335,820	337,326
Land, building and building improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	156,393	133,036
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	577,573	580,698
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property plant and equipment gross	$ 51,012	$ 49,808

PROPERTY, PLANT AND EQUIPMENT_2

PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 13,316	$ 12,980	$ 26,748	$ 25,647
Selling, general and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 4,910	$ 4,761	$ 9,861	$ 9,442

GOODWILL AND OTHER INTANGIBLE_2

GOODWILL AND OTHER INTANGIBLES - Summary of Changes in Carrying Value of Goodwill (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2020USD ($)
Goodwill [Roll Forward]
September 30, 2019	$ 437,067
Goodwill from acquisitions	3,125
Other adjustments including currency translations	(3,410)
March 31, 2020	436,782
Consumer and Professional Products
Goodwill [Roll Forward]
September 30, 2019	227,269
Goodwill from acquisitions	3,125
Other adjustments including currency translations	(3,410)
March 31, 2020	226,984
Home and Building Products
Goodwill [Roll Forward]
September 30, 2019	191,253
Goodwill from acquisitions	0
Other adjustments including currency translations	0
March 31, 2020	191,253
Defense Electronics
Goodwill [Roll Forward]
September 30, 2019	18,545
Goodwill from acquisitions	0
Other adjustments including currency translations	0
March 31, 2020	$ 18,545

GOODWILL AND OTHER INTANGIBLE_3

GOODWILL AND OTHER INTANGIBLES - Summary of Gross Carrying Value and Accumulated Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 201,111	$ 202,682
Accumulated Amortization	68,650	65,112
Trademarks	221,282	219,069
Total intangible assets	422,393	421,751
Customer relationships & other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	182,035	183,515
Accumulated Amortization	$ 60,935	57,783
Average Life (Years)	23 years
Technology and patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 19,076	19,167
Accumulated Amortization	$ 7,715	$ 7,329
Average Life (Years)	13 years

GOODWILL AND OTHER INTANGIBLE_4

GOODWILL AND OTHER INTANGIBLES - Narrative (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2020USD ($)	Sep. 30, 2019reporting_unit	Mar. 31, 2019USD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 2,403		$ 2,512	$ 4,796	$ 4,930
Estimated amortization expense, remainder of 2020	4,797			4,797
Estimated amortization expense, fiscal 2021	9,387			9,387
Estimated amortization expense, fiscal 2022	9,387			9,387
Estimated amortization expense, fiscal 2023	9,234			9,234
Estimated amortization expense, fiscal 2024	9,208			9,208
Estimated amortization expense, fiscal 2025	9,208			9,208
Estimated amortization expense, thereafter	$ 81,240			$ 81,240
Number of reporting units for goodwill impairment testing | reporting_unit		3

INCOME TAXES (Details)

INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Provision from income taxes	$ 2,034	$ 3,194	$ 8,373	$ 8,406
Income before taxes from continuing operations	2,929	9,684	19,880	23,649
Restructuring charges	3,104		9,538
Restructuring charges, net of tax	3,005		7,153
Acquisition costs	2,960		2,960
Acquisition costs, net of tax	2,321		2,321
Loss from debt extinguishment	6,690		6,690
Loss from debt extinguishment, net of tax	5,245		5,245
Other tax provisions (benefits)	$ (1,413)	$ (97)	$ (580)	$ 370
Effective tax rate	35.90%	34.00%	34.40%	34.00%

LONG-TERM DEBT - Summary of Lon

LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Feb. 20, 2020	Feb. 19, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Outstanding Balance	$ 1,242,500			$ 1,114,131
Less: current portion, outstanding balance	(9,470)			(10,525)
Long-term debt, outstanding balance	1,233,030			1,103,606
Original Issuer Premium	104			867
Less: current portion, original issuer premium, current	0			0
Long-term debt, original issuer premium, noncurrent	104			867
Capitalized Fees & Expenses	(16,908)			(10,724)
Balance Sheet	1,225,696			1,104,274
Less: current portion, balance sheet	(9,470)			(10,525)
Long-term debt, balance sheet	1,216,226			1,093,749
Senior notes due 2028
Debt Instrument [Line Items]
Outstanding Balance	850,000			0
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(12,854)			0
Balance Sheet	$ 837,146			$ 0
Coupon Interest Rate	5.75%		5.75%	0.00%
Senior notes due 2022
Debt Instrument [Line Items]
Outstanding Balance	$ 150,000	$ 150,000		$ 1,000,000
Original Issuer Premium	104			867
Capitalized Fees & Expenses	(1,098)			(9,175)
Balance Sheet	$ 149,006			$ 991,692
Coupon Interest Rate	5.25%		5.25%	5.25%
Revolver due 2025
Debt Instrument [Line Items]
Outstanding Balance	$ 183,548			$ 50,000
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(2,678)			(1,243)
Balance Sheet	180,870			48,757
Capital lease - real estate
Debt Instrument [Line Items]
Outstanding Balance	12,406			4,388
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(42)			(55)
Balance Sheet	$ 12,364			$ 4,333
Coupon Interest Rate	5.00%			5.00%
Non US lines of credit
Debt Instrument [Line Items]
Outstanding Balance	$ 9,532			$ 17,576
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(97)			(45)
Balance Sheet	9,435			17,531
Non US term loans
Debt Instrument [Line Items]
Outstanding Balance	33,462			36,977
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(122)			(188)
Balance Sheet	33,340			36,789
Other long term debt
Debt Instrument [Line Items]
Outstanding Balance	3,552			5,190
Original Issuer Premium	0			0
Capitalized Fees & Expenses	(17)			(18)
Balance Sheet	$ 3,535			$ 5,172

LONG-TERM DEBT - Summary of Int

LONG-TERM DEBT - Summary of Interest Expense Incurred (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Cash interest, capitalized interest	$ (28)	$ 0	$ (93)	$ 0
Cash interest	15,876	15,906	30,815	31,204
Amort. Debt Discount	45	66	112	134
Amort. Debt Issuance Costs & Other Fees	950	1,545	2,155	2,708
Total Interest Expense	$ 16,871	17,517	$ 33,082	34,046
Senior notes due 2028
Debt Instrument [Line Items]
Effective Interest Rate	6.00%		6.00%
Cash interest, including amounts capitalized	$ 5,566	0	$ 5,566	0
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	135	0	135	0
Total Interest Expense	$ 5,701	$ 0	$ 5,701	$ 0
Senior notes due 2022
Debt Instrument [Line Items]
Effective Interest Rate	5.70%	5.70%	5.60%	5.70%
Cash interest, including amounts capitalized	$ 8,040	$ 13,125	$ 21,165	$ 26,250
Amort. Debt Discount	45	66	112	134
Amort. Debt Issuance Costs & Other Fees	628	951	1,579	1,902
Total Interest Expense	8,713	14,142	22,856	28,286
Revolver due 2025
Debt Instrument [Line Items]
Cash interest, including amounts capitalized	1,819	1,631
Amort. Debt Discount	0	0
Amort. Debt Issuance Costs & Other Fees	165	400
Total Interest Expense	1,984	$ 2,031
Revolver due 2021
Debt Instrument [Line Items]
Cash interest, including amounts capitalized			3,201	2,564
Amort. Debt Discount			0	0
Amort. Debt Issuance Costs & Other Fees			397	541
Total Interest Expense			3,598	$ 3,105
ESOP Loans
Debt Instrument [Line Items]
Effective Interest Rate		7.20%		6.60%
Cash interest, including amounts capitalized	0	$ 449	0	$ 937
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	0	155	0	186
Total Interest Expense	$ 0	$ 604	$ 0	$ 1,123
Capital lease - real estate
Debt Instrument [Line Items]
Effective Interest Rate	6.10%	5.60%	6.00%	5.50%
Cash interest, including amounts capitalized	$ 52	$ 101	$ 113	$ 216
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	7	6	13	12
Total Interest Expense	59	107	126	228
Non US lines of credit
Debt Instrument [Line Items]
Cash interest, including amounts capitalized	3	4	7	11
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	8	4	12	8
Total Interest Expense	11	8	19	19
Non US term loans
Debt Instrument [Line Items]
Cash interest, including amounts capitalized	292	449	564	897
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	7	26	19	53
Total Interest Expense	299	475	583	950
Other long term debt
Debt Instrument [Line Items]
Cash interest, including amounts capitalized	132	147	292	329
Amort. Debt Discount	0	0	0	0
Amort. Debt Issuance Costs & Other Fees	0	3	0	6
Total Interest Expense	$ 132	$ 150	$ 292	$ 335

LONG-TERM DEBT - Narrative (Det

LONG-TERM DEBT - Narrative (Details) $ in Thousands	Feb. 19, 2020USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2019AUD ($)	Jul. 31, 2018GBP (£)	Nov. 30, 2012CAD ($)	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2020USD ($)option	Mar. 31, 2019USD ($)	Mar. 31, 2020GBP (£)	Mar. 31, 2020USD ($)	Mar. 31, 2020AUD ($)	Mar. 31, 2020CAD ($)	Feb. 20, 2020USD ($)	Jan. 30, 2020USD ($)	Jan. 29, 2020USD ($)	Sep. 30, 2019USD ($)
Debt Instrument [Line Items]
Debt outstanding											$ 1,242,500,000						$ 1,114,131,000
Loss from debt extinguishment						$ 6,690,000	$ 0	$ 6,690,000	$ 0
Basis spread on variable rate					1.30%
Mortgage loan balance											$ 1,225,696,000						$ 1,104,274,000
Troy, Ohio
Debt Instrument [Line Items]
Percentage bearing fixed interest, percentage rate										5.00%	5.00%	5.00%	5.00%
Ocala, Florida
Debt Instrument [Line Items]
Percentage bearing fixed interest, percentage rate										2.90%	2.90%	2.90%	2.90%
Number of option to extend | option								1
Lease renewal term										5 years	5 years	5 years	5 years
London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.80%
Revolver due 2025
Debt Instrument [Line Items]
Maximum borrowing capacity															$ 400,000	$ 350,000,000
Maximum borrowing capacity, accordion feature															100,000,000	50,000,000
Maximum percentage of equity interest of subsidiaries borrowings guaranteed								65.00%
Long-term line of credit											$ 183,548,000
Outstanding standby letters of credit											21,390,000
Remaining borrowing capacity											$ 195,062,000
Revolver due 2025 | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate								1.00%
Revolver due 2025 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate								2.00%
Term Loan
Debt Instrument [Line Items]
Periodic payment terms, balloon payment to be paid | £				£ 7,000,000
Interest rate at period end										2.49%	2.49%	2.49%	2.49%
Term Loan | Northcote Holdings Pty. Ltd
Debt Instrument [Line Items]
Face amount			$ 29,625,000
Term Loan | Ames UK
Debt Instrument [Line Items]
Face amount | £				14,000,000
Debt instrument, periodic payment, principal | £				£ 350,000
Long-term line of credit, revolver outstanding balance										£ 2,728,000	$ 3,381,000
Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Interest rate at period end										1.60%	1.60%	1.60%	1.60%
Revolving Credit Facility | Ames UK
Debt Instrument [Line Items]
Face amount | £				£ 5,000,000
Term and Mortgage Loans | Ames UK
Debt Instrument [Line Items]
Mortgage loan balance										£ 15,398,000	$ 19,084,000
Letter of Credit Subfacility | Revolver due 2025
Debt Instrument [Line Items]
Maximum borrowing capacity															100,000,000	50,000,000
Multicurrency Subfacility | Revolver due 2025
Debt Instrument [Line Items]
Maximum borrowing capacity															$ 200,000,000	$ 100,000,000
Senior notes due 2028
Debt Instrument [Line Items]
Face amount	$ 850,000,000
Debt instrument, interest rate, stated percentage	5.75%									5.75%	5.75%	5.75%	5.75%				0.00%
Debt outstanding											$ 850,000,000						$ 0
Capitalized fees and expenses	$ 12,989,000													$ 1,145,000
Mortgage loan balance											837,146,000						$ 0
Senior notes due 2028 | Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Convertible debt, fair value disclosures											$ 799,000,000
Senior notes due 2022
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.25%									5.25%	5.25%	5.25%	5.25%				5.25%
Percentage of principal amount redeemed	85.00%
Debt redeemed	$ 1,000,000,000
Debt outstanding											$ 150,000,000			$ 150,000,000			$ 1,000,000,000
Loss from debt extinguishment	6,690,000
Write off of debt issuance costs	5,873,000
Tender offer net premium expense	607,000
Redemption interest expense	$ 210,000
Mortgage loan balance											149,006,000						$ 991,692,000
Senior notes due 2022 | Fair Value, Inputs, Level 1
Debt Instrument [Line Items]
Convertible debt, fair value disclosures											139,500,000
Senior Notes
Debt Instrument [Line Items]
Debt outstanding											1,000,000,000
Capitalized fees and expenses											13,952,000
ESOP Loans
Debt Instrument [Line Items]
Periodic payment terms, balloon payment to be paid		$ 569,000
Debt instrument, periodic payment, principal								$ 635,000
Mortgage loan balance											$ 31,148,000
ESOP Loans | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		3.00%						2.91%
Capital lease - real estate
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage										5.00%	5.00%	5.00%	5.00%				5.00%
Debt outstanding											$ 12,406,000						$ 4,388,000
Mortgage loan balance											12,364,000						4,333,000
Non US lines of credit
Debt Instrument [Line Items]
Debt outstanding											9,532,000						17,576,000
Long-term line of credit											0
Remaining borrowing capacity											10,628,000		$ 15,000
Mortgage loan balance											$ 9,435,000						$ 17,531,000
Proceeds from long-term lines of credit					$ 15,000			$ 10,628,000
Non US lines of credit | Libor Rate
Debt Instrument [Line Items]
Interest rate at period end										2.29%	2.29%	2.29%	2.29%
Non US lines of credit | Bankers Acceptance Rate
Debt Instrument [Line Items]
Interest rate at period end										2.30%	2.30%	2.30%	2.30%
Term Loan May 2014 | Northcote Holdings Pty. Ltd
Debt Instrument [Line Items]
Face amount			20,000,000
Debt instrument, periodic payment, principal			1,250,000
Maximum borrowing capacity increase (decrease)			$ (10,000,000)
Term Loan December 2013 and May 2014 | Northcote Holdings Pty. Ltd
Debt Instrument [Line Items]
Basis spread on variable rate			1.90%
Long-term line of credit											$ 14,378,000	$ 23,375,000
Debt instrument, interest rate, effective percentage										2.39%	2.39%	2.39%	2.39%
Mortgages | Ames UK
Debt Instrument [Line Items]
Face amount | £				4,000,000
Periodic payment terms, balloon payment to be paid | £				2,333,000
Debt instrument, periodic payment, principal | £				£ 83,000
Interest rate at period end										2.04%	2.04%	2.04%	2.04%
Term Loan Due 2019 | Medium-term Notes
Debt Instrument [Line Items]
Periodic payment terms, balloon payment to be paid			$ 13,375,000
Line of Credit One | Non US lines of credit | Northcote Holdings Pty. Ltd
Debt Instrument [Line Items]
Basis spread on variable rate			1.80%
Mortgage loan balance											$ 0
Debt instrument, interest rate, effective percentage										2.20%	2.20%	2.20%	2.20%
Receivables Purchase Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%
Mortgage loan balance											$ 6,151,000	$ 10,000,000
Debt instrument, interest rate, effective percentage										1.65%	1.65%	1.65%	1.65%

SHAREHOLDERS' EQUITY (Details)

SHAREHOLDERS' EQUITY (Details)

Apr. 27, 2020$ / shares

Jan. 30, 2020shares

Mar. 31, 2020USD ($)senior_executive$ / sharesshares

Dec. 31, 2019USD ($)$ / sharesshares

Sep. 30, 2019$ / shares

Jun. 30, 2019$ / shares

Mar. 31, 2019$ / shares

Dec. 31, 2018$ / shares

Mar. 31, 2020USD ($)$ / sharesshares

Mar. 31, 2019$ / shares

Sep. 30, 2019$ / shares

Aug. 01, 2018USD ($)

Jan. 31, 2018shares

Aug. 03, 2016USD ($)

Class of Stock [Line Items]

Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares

$ 0.0750

$ 0.0725

$ 0.1500

$ 0.1450

Share-based compensation arrangement by share-based payment award, expiration period

10 years

Maximum percentage of exercise price at grant date fair value

100.00%

Number of shares available for grant (in shares)

1,057,505

1,057,505

Stock repurchase program, authorized amount | $

$ 50,000,000

$ 50,000,000

Stock repurchase program, remaining authorized repurchase amount | $

$ 57,955,000

$ 57,955,000

2006 Equity Incentive Plan

Class of Stock [Line Items]

Share based compensation arrangement by share based payment award equity instruments other than options additional grants in future (in shares)

0

0

Restricted Stock and Restricted Stock Units

Class of Stock [Line Items]

Award vesting period

3 years

Equity instruments other than options, grants in period (in shares)

216,523

Equity instruments other than options, granted in period, fair value | $

$ 4,705,000

Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares

$ 21.73

Restricted Stock

Class of Stock [Line Items]

Shares paid for tax withholding for share based compensation (in shares)

261,223

340,775

Shares paid for tax withholding for share based compensation, value | $

$ 5,721,000

$ 7,409,000

Shares paid for tax withholding for share based compensation, value per share (in dollars per share) | $ / shares

$ 21.90

$ 21.74

Restricted Stock | Minimum

Class of Stock [Line Items]

Award vesting period

3 years

Restricted Stock | Maximum

Class of Stock [Line Items]

Award vesting period

4 years

Restricted Stock | Employees, executives

Class of Stock [Line Items]

Equity instruments other than options, grants in period (in shares)

804,674

Restricted Stock | Employees, executives | Tranche One

Class of Stock [Line Items]

Award vesting period

34 months

Equity instruments other than options, grants in period (in shares)

99,772

Equity instruments other than options, granted in period, fair value | $

$ 2,200,000

Number of executive officers granted shares | senior_executive

7

Restricted Stock | Employees, executives | Tranche Two

Class of Stock [Line Items]

Award vesting period

4 years

Equity instruments other than options, grants in period (in shares)

660,000

Equity instruments other than options, granted in period, fair value | $

$ 9,534,000

Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares

$ 14.45

Number of executive officers granted shares | senior_executive

2

Award post-vesting holding period

2 years

Restricted Stock | Employees, executives | Minimum | Tranche Two

Class of Stock [Line Items]

Amount of shares that can vest based on attainment of minimum performance condition (in shares)

480,000

480,000

Restricted Stock | Employees, executives | Maximum | Tranche Two

Class of Stock [Line Items]

Amount of shares that can vest based on attainment of minimum performance condition (in shares)

660,000

660,000

Restricted Stock | Non-employees, directors

Class of Stock [Line Items]

Award vesting period

3 years

Equity instruments other than options, granted in period, fair value | $

$ 990,000

Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares

$ 22.05

Restricted Stock | Non-employees, directors | Tranche One

Class of Stock [Line Items]

Equity instruments other than options, grants in period (in shares)

44,902

Equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) | $ / shares

$ 22.05

Restricted Stock Units

Class of Stock [Line Items]

Shares paid for tax withholding for share based compensation (in shares)

3,307

Shares paid for tax withholding for share based compensation, value | $

$ 70,000

Shares paid for tax withholding for share based compensation, value per share (in dollars per share) | $ / shares

$ 21.22

Incentive Plan

Class of Stock [Line Items]

Number of shares authorized for award (in shares)

5,050,000

5,050,000

1,000,000

Number of additional shares authorized for award (in shares)

1,700,000

Incentive Plan | Incentive Stock Options

Class of Stock [Line Items]

Number of shares authorized for award (in shares)

600,000

600,000

Quarterly Dividend

Class of Stock [Line Items]

Common stock, dividends, per share, cash paid (in dollars per share) | $ / shares

$ 0.075

$ 0.075

$ 0.0725

$ 0.0725

$ 0.0725

$ 0.0725

$ 0.15

$ 0.29

Quarterly Dividend | Subsequent Event

Class of Stock [Line Items]

Dividends declared, amount per share (in dollars per share) | $ / shares

$ 0.075

SHAREHOLDERS' EQUITY - Compensa

SHAREHOLDERS' EQUITY - Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Restricted stock	$ 3,662	$ 3,422	$ 6,812	$ 6,355
ESOP	658	492	1,490	1,145
Total stock based compensation	$ 4,320	$ 3,914	$ 8,302	$ 7,500

EARNINGS PER SHARE (EPS) (Detai

EARNINGS PER SHARE (EPS) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Common shares outstanding	47,431	46,800	47,431	46,800
Unallocated ESOP shares	(2,159)	(2,409)	(2,159)	(2,409)
Non-vested restricted stock	(3,562)	(3,427)	(3,562)	(3,427)
Impact on weighted average shares	(145)	(15)	(341)	(115)
Weighted average shares outstanding - basic	41,565	40,949	41,369	40,849
Incremental shares from stock based compensation	2,169	1,883	2,457	1,527
Weighted average shares outstanding - diluted	43,734	42,832	43,826	42,376

BUSINESS SEGMENTS - Revenues (D

BUSINESS SEGMENTS - Revenues (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020USD ($)	Mar. 31, 2019USD ($)	Mar. 31, 2020USD ($)segment	Mar. 31, 2019USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Revenue	$ 566,350	$ 549,633	$ 1,114,788	$ 1,060,155
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	274,912	287,732	515,988	504,206
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	209,829	186,799	451,210	410,094
Defense Electronics
Segment Reporting Information [Line Items]
Revenue	$ 81,609	$ 75,102	$ 147,590	$ 145,855

BUSINESS SEGMENTS - Disaggregat

BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 566,350	$ 549,633	$ 1,114,788	$ 1,060,155
United States
Disaggregation of Revenue [Line Items]
Revenue	445,543	431,569	878,794	832,607
Europe
Disaggregation of Revenue [Line Items]
Revenue	34,622	28,862	47,235	47,055
Canada
Disaggregation of Revenue [Line Items]
Revenue	29,591	28,887	61,199	61,862
Australia
Disaggregation of Revenue [Line Items]
Revenue	39,221	42,994	94,055	87,826
All other countries
Disaggregation of Revenue [Line Items]
Revenue	17,373	17,321	33,505	30,805
Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Revenue	274,912	287,732	515,988	504,206
Consumer and Professional Products | United States
Disaggregation of Revenue [Line Items]
Revenue	191,412	204,445	351,570	347,361
Consumer and Professional Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	24,737	20,343	31,342	28,208
Consumer and Professional Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	17,515	18,845	35,296	38,210
Consumer and Professional Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	39,032	41,749	93,260	85,788
Consumer and Professional Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	2,216	2,350	4,520	4,639
Consumer and Professional Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	40,505	38,441	75,595	65,599
Consumer and Professional Products | Retail
Disaggregation of Revenue [Line Items]
Revenue	144,904	162,576	264,524	275,941
Consumer and Professional Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	14,884	13,545	29,857	27,817
Consumer and Professional Products | Industrial
Disaggregation of Revenue [Line Items]
Revenue	10,535	11,416	21,158	21,174
Consumer and Professional Products | International excluding North America
Disaggregation of Revenue [Line Items]
Revenue	64,084	61,754	124,854	113,675
Home and Building Products
Disaggregation of Revenue [Line Items]
Revenue	209,829	186,799	451,210	410,094
Home and Building Products | United States
Disaggregation of Revenue [Line Items]
Revenue	199,060	175,945	426,010	385,772
Home and Building Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	5	29	28	46
Home and Building Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	7,867	6,984	19,120	17,965
Home and Building Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	0	266	0	450
Home and Building Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	2,897	3,575	6,052	5,861
Home and Building Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	100,808	90,271	222,805	203,638
Home and Building Products | Commercial construction
Disaggregation of Revenue [Line Items]
Revenue	86,300	76,181	178,187	160,557
Home and Building Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	22,721	20,347	50,218	45,899
Defense Electronics
Disaggregation of Revenue [Line Items]
Revenue	81,609	75,102	147,590	145,855
Defense Electronics | United States
Disaggregation of Revenue [Line Items]
Revenue	55,071	51,179	101,214	99,474
Defense Electronics | Europe
Disaggregation of Revenue [Line Items]
Revenue	9,880	8,490	15,865	18,801
Defense Electronics | Canada
Disaggregation of Revenue [Line Items]
Revenue	4,209	3,058	6,783	5,687
Defense Electronics | Australia
Disaggregation of Revenue [Line Items]
Revenue	189	979	795	1,588
Defense Electronics | All other countries
Disaggregation of Revenue [Line Items]
Revenue	12,260	11,396	22,933	20,305
Defense Electronics | U.S. Government
Disaggregation of Revenue [Line Items]
Revenue	53,623	46,376	96,324	91,936
Defense Electronics | International
Disaggregation of Revenue [Line Items]
Revenue	25,021	23,129	43,554	45,228
Defense Electronics | Commercial
Disaggregation of Revenue [Line Items]
Revenue	$ 2,965	$ 5,597	$ 7,712	$ 8,691

BUSINESS SEGMENTS - Segment EBI

BUSINESS SEGMENTS - Segment EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 47,963	$ 42,481	$ 103,123	$ 87,862
Net interest expense	(16,561)	(17,305)	(32,511)	(33,636)
Depreciation and amortization	(15,719)	(15,492)	(31,544)	(30,577)
Loss from debt extinguishment, net	(6,690)	0	(6,690)	0
Income before taxes from continuing operations	2,929	9,684	19,880	23,649
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBITDA	59,910	53,689	127,012	110,334
Depreciation and amortization	(15,566)	(15,353)	(31,241)	(30,304)
Operating Segments | Consumer and Professional Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	25,027	28,616	46,953	49,181
Depreciation and amortization	(8,222)	(8,184)	(16,453)	(15,990)
Operating Segments | Home and Building Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	30,635	20,137	71,336	51,432
Depreciation and amortization	(4,668)	(4,548)	(9,468)	(9,057)
Operating Segments | Defense Electronics
Segment Reporting Information [Line Items]
Adjusted EBITDA	4,248	4,936	8,723	9,721
Depreciation and amortization	(2,676)	(2,621)	(5,320)	(5,257)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Adjusted EBITDA	(11,947)	(11,208)	(23,889)	(22,472)
Net interest expense	(16,561)	(17,305)	(32,511)	(33,636)
Depreciation and amortization	(15,719)	(15,492)	(31,544)	(30,577)
Loss from debt extinguishment, net	(6,690)	0	(6,690)	0
Restructuring charges	(3,104)	0	(9,538)	0
Acquisition costs	$ (2,960)	$ 0	$ (2,960)	$ 0

BUSINESS SEGMENTS - Depreciatio

BUSINESS SEGMENTS - Depreciation, Amortization And Capital Expenditures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	$ 15,719	$ 15,492	$ 31,544	$ 30,577
CAPITAL EXPENDITURES	9,347	9,021	22,519	17,418
Operating Segments
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	15,566	15,353	31,241	30,304
CAPITAL EXPENDITURES	9,277	8,829	22,237	17,208
Corporate
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	153	139	303	273
CAPITAL EXPENDITURES	70	192	282	210
Consumer and Professional Products | Operating Segments
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	8,222	8,184	16,453	15,990
CAPITAL EXPENDITURES	3,800	3,806	7,532	8,140
Home and Building Products | Operating Segments
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	4,668	4,548	9,468	9,057
CAPITAL EXPENDITURES	3,556	2,524	11,495	5,335
Defense Electronics | Operating Segments
Segment Reporting Information [Line Items]
DEPRECIATION and AMORTIZATION	2,676	2,621	5,320	5,257
CAPITAL EXPENDITURES	$ 1,921	$ 2,499	$ 3,210	$ 3,733

BUSINESS SEGMENTS - Summary of

BUSINESS SEGMENTS - Summary of Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Continuing assets	$ 2,315,553	$ 2,071,730
Assets of discontinued operations	3,194	3,209
Total Assets	2,318,747	2,074,939
Operating Segments
Segment Reporting Information [Line Items]
Continuing assets	2,219,468	1,989,301
Operating Segments | Consumer and Professional Products
Segment Reporting Information [Line Items]
Continuing assets	1,279,376	1,070,510
Operating Segments | Home and Building Products
Segment Reporting Information [Line Items]
Continuing assets	592,011	571,216
Operating Segments | Defense Electronics
Segment Reporting Information [Line Items]
Continuing assets	348,081	347,575
Corporate
Segment Reporting Information [Line Items]
Continuing assets	$ 96,085	$ 82,429

EMPLOYEE BENEFIT PLANS (Details

EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Interest cost	$ 1,151	$ 1,571	$ 2,302	$ 3,141
Expected return on plan assets	(2,586)	(2,583)	(5,172)	(5,166)
Amortization:
Prior service cost	4	3	8	7
Recognized actuarial loss	1,042	222	2,084	444
Net periodic expense (income)	$ (389)	$ (787)	$ (778)	$ (1,574)

RECENT ACCOUNTING PRONOUNCEME_2

RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Oct. 01, 2019	Oct. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
ROU assets		$ 156,258
Lease liabilities		$ 161,545
Accounting Standards Update 2016-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
ROU assets			$ 163,552
Lease liabilities			$ 163,676
Adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative impact of adoption	[1]			$ 5,673
Retained Earnings | Adoption of ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative impact of adoption	[1]			$ 5,673
[1]	See Note 14 - Recent Accounting Pronouncements and Note 3 - Revenue for additional information.

DISCONTINUED OPERATIONS - Narra

DISCONTINUED OPERATIONS - Narrative (Details) - USD ($)	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Feb. 06, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Claims dispute settlement related to PPC divestiture			$ 11,000,000
Claims dispute settlement related to PPC divestiture, net of tax			7,646,000
Payment of claims dispute settlement		$ 9,500,000
Plastics
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration after sale adjustments						$ 465,000,000
Consideration						$ 465,000,000
Installation Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 0		$ 0	$ 0	$ 0
Clopay Services Corporation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Environmental exit costs, costs accrued to date							$ 5,700,000

DISCONTINUED OPERATIONS - Balan

DISCONTINUED OPERATIONS - Balance Sheets Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Assets of discontinued operations:
Prepaid and other current assets	$ 321	$ 321
Other long-term assets	2,873	2,888
Total assets of discontinued operations	3,194	3,209
Liabilities of discontinued operations:
Accrued liabilities, current	2,450	4,333
Other long-term liabilities	3,154	3,331
Total liabilities of discontinued operations	$ 5,604	$ 7,664

RESTRUCTURING CHARGES - Narrati

RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Mar. 31, 2020USD ($)position
Restructuring Cost and Reserve [Line Items]
Restructuring charges, pre-tax	$ 3,104		$ 9,538
Non-cash charges	532	$ 4,160	4,692
Restructuring costs			4,846
Impairment charge, operating lease			1,968
Impairment charge, leasehold improvements			671
Inventory write down			304
Impairment charge, manufacturing assets			$ 1,749
Reduction of headcount | position			148
One-time charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	35,000		$ 35,000
Capital investments
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	40,000		40,000
Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	16,000		16,000
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	12,000		12,000
Restructuring charges, pre-tax	1,658		3,792
Non-cash charges	0	0
Restructuring costs			3,792
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	4,000		4,000
Restructuring charges, pre-tax	914		1,054
Non-cash charges	0	$ 0
Restructuring costs			1,054
Asset write-downs
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost	$ 19,000		$ 19,000

RESTRUCTURING CHARGES - Summary

RESTRUCTURING CHARGES - Summary of the Restructuring and Other Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,104	$ 9,538
Personnel related costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,658	3,792
Facilities, exit costs and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	914	1,054
Non-cash facility and other
Restructuring Cost and Reserve [Line Items]
Restructuring charges	532	4,692
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,353	4,076
Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,751	$ 5,462

RESTRUCTURING CHARGES - Summa_2

RESTRUCTURING CHARGES - Summary of Accrued Liability for the Restructuring and Related Charges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Restructuring Reserve [Roll Forward]
Restructuring reserve	$ 1,513	$ 0	$ 0
Q1 restructuring charges	3,104	6,434
Cash payments	(1,955)	(761)
Non-cash charges	(532)	(4,160)	(4,692)
Restructuring reserve	2,130	1,513	2,130
Personnel related costs
Restructuring Reserve [Roll Forward]
Restructuring reserve	1,513	0	0
Q1 restructuring charges	1,658	2,134
Cash payments	(1,041)	(621)
Non-cash charges	0	0
Restructuring reserve	2,130	1,513	2,130
Facilities, exit costs and other
Restructuring Reserve [Roll Forward]
Restructuring reserve	0	0	0
Q1 restructuring charges	914	140
Cash payments	(914)	(140)
Non-cash charges	0	0
Restructuring reserve	0	0	0
Other related costs
Restructuring Reserve [Roll Forward]
Restructuring reserve	0	0	0
Q1 restructuring charges	532	4,160
Cash payments	0	0
Non-cash charges	(532)	(4,160)
Restructuring reserve	$ 0	$ 0	$ 0

OTHER INCOME (EXPENSE) (Details

OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Foreign currency transaction gain (loss), before tax	$ 745	$ (118)	$ 369	$ 384
Net periodic benefit income	389	787	778	1,574
Investment income, net	$ (230)	$ 108	(149)	$ 31
Contract award income			$ 700

WARRANTY LIABILITY - Narrative

WARRANTY LIABILITY - Narrative (Details)	6 Months Ended
	Mar. 31, 2020
DE | Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
DE | Maximum
Product Warranty Liability [Line Items]
Product warranty period	2 years
HBP | Minimum
Product Warranty Liability [Line Items]
Product warranty period	1 year
HBP | Maximum
Product Warranty Liability [Line Items]
Product warranty period	10 years
CPP
Product Warranty Liability [Line Items]
Product warranty period	90 days

WARRANTY LIABILITY - Changes in

WARRANTY LIABILITY - Changes in Warrant Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward]
Balance, beginning of period	$ 7,344	$ 9,041	$ 7,894	$ 8,174
Warranties issued and changes in estimated pre-existing warranties	4,862	4,700	8,227	8,761
Actual warranty costs incurred	(4,417)	(5,730)	(8,332)	(8,924)
Balance, end of period	$ 7,789	$ 8,011	$ 7,789	$ 8,011

OTHER COMPREHENSIVE INCOME (L_3

OTHER COMPREHENSIVE INCOME (LOSS) - Summary of OCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	$ (14,241)		$ 2,822		$ (7,354)	$ (2,486)
Total other comprehensive income (loss), tax	(593)		58		(639)	(84)
Total other comprehensive income (loss), net of taxes	(14,834)	$ 6,841	2,880	$ (5,450)	(7,993)	(2,570)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	(16,471)		2,885		(10,001)	(2,851)
Total other comprehensive income (loss), tax	0		0		0	0
Total other comprehensive income (loss), net of taxes	(16,471)		2,885		(10,001)	(2,851)
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	847		201		1,694	472
Total other comprehensive income (loss), tax	(178)		(17)		(353)	(104)
Total other comprehensive income (loss), net of taxes	669		184		1,341	368
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income (loss), pre-tax	1,383		(264)		953	(107)
Total other comprehensive income (loss), tax	(415)		75		(286)	20
Total other comprehensive income (loss), net of taxes	$ 968		$ (189)		$ 667	$ (87)

OTHER COMPREHENSIVE INCOME (L_4

OTHER COMPREHENSIVE INCOME (LOSS) - AOCI (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ 476,454	$ 494,693	$ 477,763	$ 474,284	$ 471,561	$ 474,391
Foreign currency translation adjustments
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(41,285)		(31,284)
Pension and other defined benefit plans
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	(33,473)		(34,814)
Cash flow hedges
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	849		182
Accumulated other comprehensive income (loss), attributable to parent
Class of Stock [Line Items]
Accumulated other comprehensive income (loss)	$ (73,909)	$ (59,075)	$ (65,916)	$ (36,682)	$ (39,562)	$ (34,112)

OTHER COMPREHENSIVE INCOME (L_5

OTHER COMPREHENSIVE INCOME (LOSS) - Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss)	$ 2,929		$ 9,684		$ 19,880	$ 23,649
Tax benefit (expense)	(2,034)		(3,194)		(8,373)	(8,406)
Net income (loss)	895	$ 10,612	(1,156)	$ 8,753	11,507	7,597
Pension and other defined benefit plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss)	(1,046)		(225)		(2,092)	(451)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss)	1,050		310		994	992
Accumulated other comprehensive income (loss), attributable to parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss)	4		85		(1,098)	541
Tax benefit (expense)	(1)		(18)		231	(114)
Net income (loss)	$ 3		$ 67		$ (867)	$ 427

LEASES - Narrative (Details)

LEASES - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2020	Oct. 01, 2019
Lessee, Lease, Description [Line Items]
ROU assets	$ 156,258
Lease liabilities	161,545
Impairment charge, operating lease	1,968
Impairment charge, leasehold improvements	$ 671
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
ROU assets		$ 163,552
Lease liabilities		$ 163,676

LEASES - Schedule of Lease Cost

LEASES - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2020	Mar. 31, 2020
Lease Cost
Fixed	$ 9,187	$ 18,739
Variable	1,823	3,576
Short-term	1,393	2,823
Total	$ 12,403	$ 25,138

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2020USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 21,582
Financing cash flows from finance leases	1,940
Total	$ 23,522

LEASES - Summary of Supplementa

LEASES - Summary of Supplemental Balance Sheet Information (Details) $ in Thousands	Mar. 31, 2020USD ($)
Operating Leases:
Operating right-of-use assets	$ 156,258
Lease Liabilities:
Current portion of operating lease liabilities	28,047
Long-term operating lease liabilities	133,498
Total operating lease liabilities	161,545
Finance Leases:
Property, plant and equipment, net	14,059
Lease Liabilities:
Lease liabilities, notes payable and current portion of long-term debt	4,014
Lease liabilities, long-term debt, net	10,074
Total financing lease liabilities	14,088
Accumulated depreciation	$ 1,946

LEASES - Summary of Future Matu

LEASES - Summary of Future Maturities of Lease Payments for Operating Leases (Details) $ in Thousands	Mar. 31, 2020USD ($)
Operating Leases
2020	$ 17,505
2021	33,312
2022	28,570
2023	22,261
2024	16,467
2025	14,334
Thereafter	72,614
Total lease payments	205,063
Less: Imputed Interest	(43,518)
Present value of lease liabilities	161,545
Finance Leases
2020	2,452
2021	4,164
2022	2,607
2023	2,315
2024	2,074
2025	1,383
Thereafter	0
Total lease payments	14,995
Less: Imputed Interest	(907)
Present value of lease liabilities	$ 14,088

LEASES - Summary of Maturities

LEASES - Summary of Maturities of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating Leases
2020	$ 35,176
2021	30,730
2022	26,119
2023	20,008
2024	14,198
Thereafter	78,105
Total	$ 204,336

LEASES - Weighted Average Lease

LEASES - Weighted Average Lease Terms and Discount Rates (Details)	Mar. 31, 2020
Weighted-average remaining lease term (years)
Operating leases	8 years 9 months 18 days
Finance Leases	2 years 1 month 6 days
Weighted-average discount rate
Operating Leases	4.10%
Finance Leases	5.50%

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands	Jun. 30, 2011USD ($)
Commitments and Contingencies Disclosure [Abstract]
Net capital cost value in proposed remedial action plan	$ 10,000

CONSOLIDATING GUARANTOR AND N_3

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Narrative (Details)	6 Months Ended
	Mar. 31, 2020
Condensed Financial Statements, Captions [Line Items]
Maximum percentage of segment adjusted EBITDA to business EBITDA	50.00%
Clopay Corporation, Telephonics Corporation, The AMES Companies, Inc., ATT Southern LLC, Clopay Ames Holding Corp., ClosetMaid, LLC, CornellCookson, LLC and Cornell Real Estate Holdings, LLC
Condensed Financial Statements, Captions [Line Items]
Noncontrolling interest, ownership percentage by parent	100.00%

CONSOLIDATING GUARANTOR AND N_4

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018
CURRENT ASSETS
Cash and equivalents	$ 69,024		$ 72,377
Accounts receivable, net of allowances	335,033		264,450
Contract costs and recognized income not yet billed, net of progress payments	94,495		105,111
Inventories, net	462,119		442,121
Prepaid and other current assets	42,723		40,799
Assets of discontinued operations	321		321
Total Current Assets	1,003,715		925,179
PROPERTY, PLANT AND EQUIPMENT, net	335,820		337,326
OPERATING LEASE RIGHT-OF-USE ASSETS	156,258
GOODWILL	436,782		437,067
INTANGIBLE ASSETS, net	353,743		356,639
INTERCOMPANY RECEIVABLE	0		0
EQUITY INVESTMENTS IN SUBSIDIARIES	0		0
OTHER ASSETS	29,556		15,840
ASSETS OF DISCONTINUED OPERATIONS	2,873		2,888
Total Assets	2,318,747		2,074,939
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	9,470		10,525
Accounts payable and accrued liabilities	347,153		375,241
Current portion of operating lease liabilities	28,047
Liabilities of discontinued operations	2,450		4,333
Total Current Liabilities	387,120		390,099
LONG-TERM DEBT, net	1,216,226		1,093,749
LONG-TERM OPERATING LEASE LIABILITIES	133,498
INTERCOMPANY PAYABLES	0		0
OTHER LIABILITIES	102,295		109,997
LIABILITIES OF DISCONTINUED OPERATIONS	3,154		3,331
Total Liabilities	1,842,293		1,597,176
SHAREHOLDERS’ EQUITY	476,454	$ 494,693	477,763	$ 474,284	$ 471,561	$ 474,391
Total Liabilities and Shareholders’ Equity	2,318,747		2,074,939
Reportable Legal Entities | Parent Company
CURRENT ASSETS
Cash and equivalents	9,252		1,649
Accounts receivable, net of allowances	0		0
Contract costs and recognized income not yet billed, net of progress payments	0		0
Inventories, net	0		0
Prepaid and other current assets	11,482		8,238
Assets of discontinued operations	0		0
Total Current Assets	20,734		9,887
PROPERTY, PLANT AND EQUIPMENT, net	1,295		1,184
OPERATING LEASE RIGHT-OF-USE ASSETS	10,060
GOODWILL	0		0
INTANGIBLE ASSETS, net	93		93
INTERCOMPANY RECEIVABLE	67,266		5,834
EQUITY INVESTMENTS IN SUBSIDIARIES	1,658,792		1,628,031
OTHER ASSETS	8,695		8,182
ASSETS OF DISCONTINUED OPERATIONS	0		0
Total Assets	1,766,935		1,653,211
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0		0
Accounts payable and accrued liabilities	28,873		41,796
Current portion of operating lease liabilities	1,830
Liabilities of discontinued operations	0		0
Total Current Liabilities	30,703		41,796
LONG-TERM DEBT, net	1,167,023		1,040,449
LONG-TERM OPERATING LEASE LIABILITIES	9,353
INTERCOMPANY PAYABLES	63,230		71,634
OTHER LIABILITIES	20,172		21,569
LIABILITIES OF DISCONTINUED OPERATIONS	0		0
Total Liabilities	1,290,481		1,175,448
SHAREHOLDERS’ EQUITY	476,454		477,763
Total Liabilities and Shareholders’ Equity	1,766,935		1,653,211
Reportable Legal Entities | Guarantor Companies
CURRENT ASSETS
Cash and equivalents	18,977		25,217
Accounts receivable, net of allowances	283,929		227,069
Contract costs and recognized income not yet billed, net of progress payments	91,998		104,109
Inventories, net	391,934		372,839
Prepaid and other current assets	23,468		25,754
Assets of discontinued operations	0		0
Total Current Assets	810,306		754,988
PROPERTY, PLANT AND EQUIPMENT, net	290,685		289,282
OPERATING LEASE RIGHT-OF-USE ASSETS	127,133
GOODWILL	375,734		375,734
INTANGIBLE ASSETS, net	220,796		224,275
INTERCOMPANY RECEIVABLE	928,899		864,884
EQUITY INVESTMENTS IN SUBSIDIARIES	745,746		581,438
OTHER ASSETS	37,669		24,635
ASSETS OF DISCONTINUED OPERATIONS	0		0
Total Assets	3,536,968		3,115,236
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	3,474		3,075
Accounts payable and accrued liabilities	412,118		266,411
Current portion of operating lease liabilities	22,068
Liabilities of discontinued operations	0		0
Total Current Liabilities	437,660		269,486
LONG-TERM DEBT, net	10,642		3,119
LONG-TERM OPERATING LEASE LIABILITIES	108,872
INTERCOMPANY PAYABLES	563,964		457,265
OTHER LIABILITIES	77,292		81,582
LIABILITIES OF DISCONTINUED OPERATIONS	0		0
Total Liabilities	1,198,430		811,452
SHAREHOLDERS’ EQUITY	2,338,538		2,303,784
Total Liabilities and Shareholders’ Equity	3,536,968		3,115,236
Reportable Legal Entities | Non-Guarantor Companies
CURRENT ASSETS
Cash and equivalents	40,795		45,511
Accounts receivable, net of allowances	206,456		38,580
Contract costs and recognized income not yet billed, net of progress payments	2,497		1,002
Inventories, net	70,756		69,540
Prepaid and other current assets	5,149		6,951
Assets of discontinued operations	321		321
Total Current Assets	325,974		161,905
PROPERTY, PLANT AND EQUIPMENT, net	43,840		46,860
OPERATING LEASE RIGHT-OF-USE ASSETS	19,065
GOODWILL	61,048		61,333
INTANGIBLE ASSETS, net	132,854		132,271
INTERCOMPANY RECEIVABLE	148,568		75,684
EQUITY INVESTMENTS IN SUBSIDIARIES	3,109,559		3,233,038
OTHER ASSETS	(2,446)		(2,352)
ASSETS OF DISCONTINUED OPERATIONS	2,873		2,888
Total Assets	3,841,335		3,711,627
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	5,996		7,450
Accounts payable and accrued liabilities	58,903		68,390
Current portion of operating lease liabilities	4,149
Liabilities of discontinued operations	2,450		4,333
Total Current Liabilities	71,498		80,173
LONG-TERM DEBT, net	38,561		50,181
LONG-TERM OPERATING LEASE LIABILITIES	15,273
INTERCOMPANY PAYABLES	536,815		444,557
OTHER LIABILITIES	12,650		15,017
LIABILITIES OF DISCONTINUED OPERATIONS	3,154		3,331
Total Liabilities	677,951		593,259
SHAREHOLDERS’ EQUITY	3,163,384		3,118,368
Total Liabilities and Shareholders’ Equity	3,841,335		3,711,627
Elimination
CURRENT ASSETS
Cash and equivalents	0		0
Accounts receivable, net of allowances	(155,352)		(1,199)
Contract costs and recognized income not yet billed, net of progress payments	0		0
Inventories, net	(571)		(258)
Prepaid and other current assets	2,624		(144)
Assets of discontinued operations	0		0
Total Current Assets	(153,299)		(1,601)
PROPERTY, PLANT AND EQUIPMENT, net	0		0
OPERATING LEASE RIGHT-OF-USE ASSETS	0
GOODWILL	0		0
INTANGIBLE ASSETS, net	0		0
INTERCOMPANY RECEIVABLE	(1,144,733)		(946,402)
EQUITY INVESTMENTS IN SUBSIDIARIES	(5,514,097)		(5,442,507)
OTHER ASSETS	(14,362)		(14,625)
ASSETS OF DISCONTINUED OPERATIONS	0		0
Total Assets	(6,826,491)		(6,405,135)
CURRENT LIABILITIES
Notes payable and current portion of long-term debt	0		0
Accounts payable and accrued liabilities	(152,741)		(1,356)
Current portion of operating lease liabilities	0
Liabilities of discontinued operations	0		0
Total Current Liabilities	(152,741)		(1,356)
LONG-TERM DEBT, net	0		0
LONG-TERM OPERATING LEASE LIABILITIES	0
INTERCOMPANY PAYABLES	(1,164,009)		(973,456)
OTHER LIABILITIES	(7,819)		(8,171)
LIABILITIES OF DISCONTINUED OPERATIONS	0		0
Total Liabilities	(1,324,569)		(982,983)
SHAREHOLDERS’ EQUITY	(5,501,922)		(5,422,152)
Total Liabilities and Shareholders’ Equity	$ (6,826,491)		$ (6,405,135)

CONSOLIDATING GUARANTOR AND N_5

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Condensed Consolidating Statements of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Condensed Income Statements, Captions [Line Items]
Revenue	$ 566,350		$ 549,633		$ 1,114,788	$ 1,060,155
Cost of goods and services	414,318		412,129		812,835	779,605
Gross profit	152,032		137,504		301,953	280,550
Selling, general and administrative expenses	126,467		111,783		244,265	225,537
Income from operations	25,565		25,721		57,688	55,013
Other income (expense)
Interest income (expense), net	(16,561)		(17,305)		(32,511)	(33,636)
Loss from debt extinguishment, net	(6,690)		0		(6,690)	0
Other, net	615		1,268		1,393	2,272
Total other expense, net	(22,636)		(16,037)		(37,808)	(31,364)
Income before taxes from continuing operations	2,929		9,684		19,880	23,649
Provision (benefit) for income taxes	2,034		3,194		8,373	8,406
Income (loss) before equity in net income of subsidiaries	895		6,490		11,507	15,243
Equity in net income (loss) of subsidiaries	0		0		0	0
Income from continuing operations	895		6,490		11,507	15,243
Loss from operations of discontinued operations	0		(11,000)		0	(11,000)
Benefit for income taxes	0		(3,354)		0	(3,354)
Loss from discontinued operations	0		(7,646)		0	(7,646)
Net income (loss)	895	$ 10,612	(1,156)	$ 8,753	11,507	7,597
Comprehensive income (loss)	(13,939)		1,724		3,514	5,027
Reportable Legal Entities | Parent Company
Condensed Income Statements, Captions [Line Items]
Revenue	0		0		0	0
Cost of goods and services	0		0		0	0
Gross profit	0		0		0	0
Selling, general and administrative expenses	7,922		5,249		13,940	10,309
Income from operations	(7,922)		(5,249)		(13,940)	(10,309)
Other income (expense)
Interest income (expense), net	(6,880)		(7,328)		(13,204)	(13,635)
Loss from debt extinguishment, net	(6,690)				(6,690)
Other, net	(418)		(473)		(515)	(735)
Total other expense, net	(13,988)		(7,801)		(20,409)	(14,370)
Income before taxes from continuing operations	(21,910)		(13,050)		(34,349)	(24,679)
Provision (benefit) for income taxes	(9,427)		(4,242)		(13,822)	(7,777)
Income (loss) before equity in net income of subsidiaries	(12,483)		(8,808)		(20,527)	(16,902)
Equity in net income (loss) of subsidiaries	13,378		7,652		32,034	24,499
Income from continuing operations			(1,156)			7,597
Loss from operations of discontinued operations			0			0
Benefit for income taxes			0			0
Loss from discontinued operations			0			0
Net income (loss)	895		(1,156)		11,507	7,597
Comprehensive income (loss)	(13,939)		1,724		3,514	5,027
Reportable Legal Entities | Guarantor Companies
Condensed Income Statements, Captions [Line Items]
Revenue	462,500		462,739		903,892	881,983
Cost of goods and services	345,626		354,382		672,839	663,479
Gross profit	116,874		108,357		231,053	218,504
Selling, general and administrative expenses	91,338		84,813		179,186	169,789
Income from operations	25,536		23,544		51,867	48,715
Other income (expense)
Interest income (expense), net	(9,706)		(9,128)		(19,379)	(18,258)
Loss from debt extinguishment, net	0				0
Other, net	(2,667)		1,129		(4,018)	1,816
Total other expense, net	(12,373)		(7,999)		(23,397)	(16,442)
Income before taxes from continuing operations	13,163		15,545		28,470	32,273
Provision (benefit) for income taxes	6,078		5,292		11,805	11,266
Income (loss) before equity in net income of subsidiaries	7,085		10,253		16,665	21,007
Equity in net income (loss) of subsidiaries	6,341		11,646		15,537	17,696
Income from continuing operations			21,899			38,703
Loss from operations of discontinued operations			0			0
Benefit for income taxes			0			0
Loss from discontinued operations			0			0
Net income (loss)	13,426		21,899		32,202	38,703
Comprehensive income (loss)	8,028		5,448		26,804	59,017
Reportable Legal Entities | Non-Guarantor Companies
Condensed Income Statements, Captions [Line Items]
Revenue	113,926		94,285		230,965	192,525
Cost of goods and services	79,112		65,516		160,790	131,218
Gross profit	34,814		28,769		70,175	61,307
Selling, general and administrative expenses	27,300		21,409		51,324	45,226
Income from operations	7,514		7,360		18,851	16,081
Other income (expense)
Interest income (expense), net	25		(849)		72	(1,743)
Loss from debt extinguishment, net	0				0
Other, net	4,141		676		6,840	1,717
Total other expense, net	4,166		(173)		6,912	(26)
Income before taxes from continuing operations	11,680		7,187		25,763	16,055
Provision (benefit) for income taxes	5,387		2,142		10,394	4,917
Income (loss) before equity in net income of subsidiaries	6,293		5,045		15,369	11,138
Equity in net income (loss) of subsidiaries	7,085		10,253		16,665	21,007
Income from continuing operations			15,298			32,145
Loss from operations of discontinued operations			(11,000)			(11,000)
Benefit for income taxes			(3,354)			(3,354)
Loss from discontinued operations			(7,646)			(7,646)
Net income (loss)	13,378		7,652		32,034	24,499
Comprehensive income (loss)	18,776		8,736		37,432	4,185
Elimination
Condensed Income Statements, Captions [Line Items]
Revenue	(10,076)		(7,391)		(20,069)	(14,353)
Cost of goods and services	(10,420)		(7,769)		(20,794)	(15,092)
Gross profit	344		378		725	739
Selling, general and administrative expenses	(93)		312		(185)	213
Income from operations	437		66		910	526
Other income (expense)
Interest income (expense), net	0		0		0	0
Loss from debt extinguishment, net	0				0
Other, net	(441)		(64)		(914)	(526)
Total other expense, net	(441)		(64)		(914)	(526)
Income before taxes from continuing operations	(4)		2		(4)	0
Provision (benefit) for income taxes	(4)		2		(4)	0
Income (loss) before equity in net income of subsidiaries	0		0		0	0
Equity in net income (loss) of subsidiaries	(26,804)		(29,551)		(64,236)	(63,202)
Income from continuing operations			(29,551)			(63,202)
Loss from operations of discontinued operations			0			0
Benefit for income taxes			0			0
Loss from discontinued operations			0			0
Net income (loss)	(26,804)		(29,551)		(64,236)	(63,202)
Comprehensive income (loss)	$ (26,804)		$ (14,184)		$ (64,236)	$ (63,202)

CONSOLIDATING GUARANTOR AND N_6

CONSOLIDATING GUARANTOR AND NON-GUARANTOR FINANCIAL INFORMATION - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 895	$ 10,612	$ (1,156)	$ 8,753	$ 11,507	$ 7,597
Net loss from discontinued operations	0		7,646		0	7,646
Net cash provided by (used in) operating activities:					(60,843)	(55,006)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment	(9,347)		(9,021)		(22,519)	(17,418)
Acquired businesses, net of cash acquired					(10,531)	(9,219)
Investment purchase					0	(149)
Insurance payments					0	(10,604)
Proceeds from sale of assets					290	62
Net cash used in investing activities					(32,760)	(37,328)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury					(7,479)	(1,478)
Proceeds from long-term debt					1,061,343	143,101
Payments of long-term debt					(939,071)	(48,169)
Contingent consideration for acquired businesses					0	(1,686)
Financing costs					(13,176)	(945)
Dividends paid					(7,349)	(6,847)
Other, net					83	83
Net cash provided by financing activities					94,351	84,059
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by (used) in discontinued operations					(1,994)	(3,438)
Effect of exchange rate changes on cash and equivalents					(2,107)	(66)
NET DECREASE IN CASH AND EQUIVALENTS					(3,353)	(11,779)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		72,377		69,758	72,377	69,758
CASH AND EQUIVALENTS AT END OF PERIOD	69,024		57,979		69,024	57,979
Parent Company
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment purchase						(149)
Guarantor Companies
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment purchase						0
Non-Guarantor Companies
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment purchase						0
Reportable Legal Entities | Parent Company
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	895		(1,156)		11,507	7,597
Net loss from discontinued operations			0			0
Net cash provided by (used in) operating activities:					(92,042)	(77,881)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment					(282)	(210)
Acquired businesses, net of cash acquired					0	(9,219)
Insurance payments						(10,604)
Proceeds from sale of assets					0	0
Net cash used in investing activities					(282)	(20,182)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury					(7,479)	(1,478)
Proceeds from long-term debt					1,054,636	130,484
Payments of long-term debt					(921,904)	(32,419)
Contingent consideration for acquired businesses						0
Financing costs					(13,176)	(945)
Dividends paid					(7,349)	(6,847)
Other, net					(4,801)	(1,641)
Net cash provided by financing activities					99,927	87,154
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by (used) in discontinued operations					0	0
Effect of exchange rate changes on cash and equivalents					0	0
NET DECREASE IN CASH AND EQUIVALENTS					7,603	(10,909)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		1,649		15,976	1,649	15,976
CASH AND EQUIVALENTS AT END OF PERIOD	9,252		5,067		9,252	5,067
Reportable Legal Entities | Guarantor Companies
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	13,426		21,899		32,202	38,703
Net loss from discontinued operations			0			0
Net cash provided by (used in) operating activities:					26,593	24,130
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment					(19,982)	(14,071)
Acquired businesses, net of cash acquired					0	0
Insurance payments						0
Proceeds from sale of assets					292	36
Net cash used in investing activities					(19,690)	(14,035)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					0	76
Payments of long-term debt					(1,752)	(1,724)
Contingent consideration for acquired businesses						0
Financing costs					0	0
Dividends paid					0	0
Other, net					(10,839)	7,150
Net cash provided by financing activities					(12,591)	5,502
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by (used) in discontinued operations					0	0
Effect of exchange rate changes on cash and equivalents					(552)	(92)
NET DECREASE IN CASH AND EQUIVALENTS					(6,240)	15,505
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		25,217		16,353	25,217	16,353
CASH AND EQUIVALENTS AT END OF PERIOD	18,977		31,858		18,977	31,858
Reportable Legal Entities | Non-Guarantor Companies
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	13,378		7,652		32,034	24,499
Net loss from discontinued operations			7,646			7,646
Net cash provided by (used in) operating activities:					4,606	(1,255)
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment					(2,255)	(3,137)
Acquired businesses, net of cash acquired					(10,531)	0
Insurance payments						0
Proceeds from sale of assets					(2)	26
Net cash used in investing activities					(12,788)	(3,111)
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					6,707	12,541
Payments of long-term debt					(15,415)	(14,026)
Contingent consideration for acquired businesses						(1,686)
Financing costs					0	0
Dividends paid					0	0
Other, net					15,723	(5,426)
Net cash provided by financing activities					7,015	(8,597)
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by (used) in discontinued operations					(1,994)	(3,438)
Effect of exchange rate changes on cash and equivalents					(1,555)	26
NET DECREASE IN CASH AND EQUIVALENTS					(4,716)	(16,375)
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		45,511		37,429	45,511	37,429
CASH AND EQUIVALENTS AT END OF PERIOD	40,795		21,054		40,795	21,054
Elimination
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	(26,804)		(29,551)		(64,236)	(63,202)
Net loss from discontinued operations			0			0
Net cash provided by (used in) operating activities:					0	0
CASH FLOWS FROM INVESTING ACTIVITIES:
Acquisition of property, plant and equipment					0	0
Acquired businesses, net of cash acquired					0	0
Investment purchase						0
Insurance payments						0
Proceeds from sale of assets					0	0
Net cash used in investing activities					0	0
CASH FLOWS FROM FINANCING ACTIVITIES:
Purchase of shares for treasury					0	0
Proceeds from long-term debt					0	0
Payments of long-term debt					0	0
Contingent consideration for acquired businesses						0
Financing costs					0	0
Dividends paid					0	0
Other, net					0	0
Net cash provided by financing activities					0	0
CASH FLOWS FROM DISCONTINUED OPERATIONS:
Net cash provided by (used) in discontinued operations					0	0
Effect of exchange rate changes on cash and equivalents					0	0
NET DECREASE IN CASH AND EQUIVALENTS					0	0
CASH AND EQUIVALENTS AT BEGINNING OF PERIOD		$ 0		$ 0	0	0
CASH AND EQUIVALENTS AT END OF PERIOD	$ 0		$ 0		$ 0	$ 0