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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended |  |  |  |
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Sep. 30, 2019 USD ($) segment $ / shares | Sep. 30, 2019 CAD ($) segment | Sep. 30, 2018 AUD ($) | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2018 CAD ($) | Sep. 30, 2017 USD ($) | Oct. 01, 2019 USD ($) | Oct. 01, 2018 USD ($) | Nov. 16, 2017 USD ($) | Nov. 15, 2017 USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of Reportable Segments | segment |  | 3 | 3 |  |  |  |  |  |  |  |
Number of operating segments | segment |  | 3 | 3 |  |  |  |  |  |  |  |
Environmental exit costs, costs accrued to date |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
Cash in non U.S. bank accounts |  | $ 34,200,000 |  |  | 24,900,000 |  |  |  |  |  |
Fair value of insurance contracts |  | 3,408,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of trading securities |  | 4,126,000 |  |  |  |  |  |  |  |  |
Contracts revenue |  | $ 2,209,289,000 | $ 3,500 |  | $ 1,977,918,000 | $ 700 | $ 1,524,997,000 |  |  |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.32 |  |  | $ 1.29 |  |  |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | $ (8,460,000) |  |  | $ 9,403,000 |  |  |  |  |  |
Foreign currency transaction gain (loss), realized |  | (14,000) |  |  | (7,000) |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 145,319,000 |  |  | 150,634,000 |  |  |  |  |  |
Income (loss) from operations |  | 135,265,000 |  |  | 92,801,000 |  | 67,034,000 |  |  |  |
Customer program reserves and cash discounts netted against accounts receivable |  | 17,322,000 |  |  | 15,530,000 |  |  |  |  |  |
Costs in excess of billings, noncurrent |  | 13,100,000 |  |  | 29,500,000 |  |  |  |  |  |
Contract with Customer, Asset, Allowance for Credit Loss |  | 0 |  |  | 400,000 |  |  |  |  |  |
Depreciation, depletion and amortization, nonproduction |  | 51,926,000 |  |  | 46,733,000 |  | 41,220,000 |  |  |  |
Accumulated capitalized interest costs |  | 2,925,000 |  |  | 2,896,000 |  | 4,891,000 |  |  |  |
Original cost of fully depreciated property plant and equipment |  | $ 229,456,000 |  |  |  |  |  |  |  |  |
Description of fair value calculation |  | Griffon used five year projections and a 3.0% terminal value to which discount rates between 9% and 10% were applied to calculate each unit’s fair value. | Griffon used five year projections and a 3.0% terminal value to which discount rates between 9% and 10% were applied to calculate each unit’s fair value. |  |  |  |  |  |  |  |
Fair value projections |  | 5 years | 5 years |  |  |  |  |  |  |  |
Fair value terminal value |  | 3.00% | 3.00% |  |  |  |  |  |  |  |
Goodwill, impairment loss |  | $ 0 |  |  | 0 |  | 0 |  |  |  |
Unrecognized tax benefits |  | 4,061,000 |  |  | 4,519,000 |  | 4,825,000 |  |  |  |
Research and development arrangement, contract to perform for others, costs incurred, gross |  | 15,400,000 |  |  | 15,400,000 |  | 17,700,000 |  |  |  |
Assets |  | 2,074,939,000 |  |  | 2,084,890,000 |  | $ 1,873,541,000 |  | $ 2,085,933,000 |  |
Accumulated other comprehensive loss |  | $ (65,916,000) |  |  | $ (34,112,000) |  |  |  |  |  |
U.S. Federal income tax provision (benefit) rate |  | 21.00% | 21.00% | 24.50% | 24.50% | 24.50% | 35.00% |  |  |  |
Selling, general and administrative expenses |  | $ 460,004,000 |  |  | $ 436,380,000 |  | $ 341,092,000 |  |  |  |
Provisional income tax (expense) benefit |  | $ 13,100,000 |  |  | (20,587,000) |  |  |  |  |  |
Revenue, Performance Obligation Satisfied At A Point In Time, Percentage |  | 80.00% | 80.00% |  |  |  |  |  |  |  |
Revenue, Performance Obligation Satisfied Over In Time, Percentage |  | 20.00% | 20.00% |  |  |  |  |  |  |  |
Liabilities |  | $ 1,597,176,000 |  |  | 1,610,499,000 |  |  |  | 1,617,160,000 |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense |  | 12,699,000 |  |  |  |  |  |  |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading securities, realized loss |  | 1,251,000 |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Depreciation |  | $ 19,026,000 |  |  | $ 16,306,000 |  | 12,995,000 |  |  |  |
U.S. Government [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated accounts receivable |  | 8.00% | 8.00% |  |  |  |  |  |  |  |
Home Depot [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of consolidated accounts receivable |  | 12.00% | 12.00% |  |  |  |  |  |  |  |
Designated as hedging instrument [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contracts revenue |  | $ 14,000,000 |  | $ 12,000 |  |  |  |  |  |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.48 |  |  | $ 1.38 |  |  |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, before tax |  | $ 327,000 |  |  | $ 443,000 |  |  |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | 213,000 |  |  | 288,000 |  |  |  |  |  |
Gain (loss) on hedging activity |  | 1,932,000 |  |  | 657,000 |  |  |  |  |  |
Level 2 [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 32,297,000 |  |  | 68,114,000 |  |  |  |  |  |
Level 2 [Member] | Estimate of fair value measurement [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading securities |  | 2,754,000 |  |  | 2,644,000 |  |  |  |  |  |
Level 2 [Member] | Portion at other than fair value measurement [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trading securities |  | 2,233,000 |  |  | 2,086,000 |  |  |  |  |  |
Senior notes [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  | $ 1,010,000,000 |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maturity period of highly liquid investments |  | 3 months | 3 months |  |  |  |  |  |  |  |
Contracts expiration days |  | 90 days | 90 days |  |  |  |  |  |  |  |
Fair value discount rates |  | 9.50% | 9.50% |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 25 years | 25 years |  |  |  |  |  |  |  |
Maximum [Member] | Building and building improvements [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 40 years | 40 years |  |  |  |  |  |  |  |
Maximum [Member] | Machinery and equipment [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 15 years | 15 years |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contracts expiration days |  | 1 day | 1 day |  |  |  |  |  |  |  |
Fair value discount rates |  | 7.00% | 7.00% |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 8 years | 8 years |  |  |  |  |  |  |  |
Minimum [Member] | Building and building improvements [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 25 years | 25 years |  |  |  |  |  |  |  |
Minimum [Member] | Machinery and equipment [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, useful life |  | 2 years | 2 years |  |  |  |  |  |  |  |
Canadian Dollar Forward Contracts [Member] | Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Other Income [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of derivatives |  | $ 68,000 |  |  | (161,000) |  |  |  |  |  |
Canadian Dollar Forward Contracts [Member] | Maximum [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts duration |  | 360 days | 360 days |  |  |  |  |  |  |  |
Canadian Dollar Forward Contracts [Member] | Minimum [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts duration |  | 30 days | 30 days |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, excess tax benefit, amount |  | $ 304,000 |  |  | 1,299,000 |  | 4,440,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASC 606 | [1] |  |  |  |  |  |  |  | 5,618,000 |  |
Discontinued Operations, Held-for-sale [Member] | Plastics [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, including discontinued operation, consideration |  |  |  |  |  |  |  |  |  | $ 465,000,000 | $ 465,000,000
Foreign currency translation adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  | (31,284,000) |  |  | (22,824,000) |  |  |  |  |  |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative catch-up adjustment related to adoption of ASC 606 | [1] |  |  |  |  |  |  |  | $ 5,618,000 |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 66,400,000 |  |  | 59,600,000 |  | 32,500,000 |  |  |  |
Advertising [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | $ 20,000,000 |  |  | $ 21,000,000 |  | $ 22,000,000 |  |  |  |
Forecast [Member] | Accounting Standards Update 2016-02 [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | $ 170,000,000 |  |  |
Liabilities |  |  |  |  |  |  |  | 170,000 |  |  |
Forecast [Member] | Accounting Standards Update 2016-02 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  | 160,000,000 |  |  |
Liabilities |  |  |  |  |  |  |  | $ 160,000 |  |  |
[1] | See Note 1 - Recently adopted accounting pronouncements and Note 2 - Revenue for additional information.

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