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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, 2018 AUD ($) component segment | Sep. 30, 2018 USD ($) component segment $ / shares | Sep. 30, 2018 CAD ($) component segment | Sep. 30, 2017 AUD ($) | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2017 CAD ($) | Sep. 30, 2016 USD ($) | Nov. 16, 2017 USD ($) | Nov. 15, 2017 USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Number of operating segments | segment | 2 | 2 | 2 |  |  |  |  |  |
Environmental exit costs, costs accrued to date |  |  |  |  | $ 5,700,000 |  |  |  |
Cash in non U.S. bank accounts |  | $ 24,900,000 |  |  | 26,500,000 |  |  |  |
Fair value of insurance contracts |  | 3,032,000 |  |  |  |  |  |  |
Proceeds from sale of trading securities |  | 4,126,000 |  |  |  |  | $ 715,000 |  |
Contracts revenue |  | $ 1,977,918,000 | $ 700 |  | $ 1,524,997,000 | $ 4,690 | 1,477,035,000 |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.29 |  |  | $ 1.25 |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | $ 9,403,000 |  |  | $ 10,667,000 |  |  |  |
Foreign currency transaction gain (loss), realized |  | (7,000) |  |  | 378,000 |  |  |  |
Share-based compensation, excess tax benefit, amount |  | 2,193,000 |  |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | $ 150,634,000 |  |  | 150,822,000 |  |  |  |
Contract period | 1 year | 1 year | 1 year |  |  |  |  |  |
Income (loss) from operations |  | $ 96,450,000 |  |  | 69,027,000 |  | 82,340,000 |  |
Provision for loss on contracts |  | 12,200,000 |  |  |  |  |  |  |
Customer program reserves and cash discounts netted against accounts receivable |  | 15,530,000 |  |  | 11,249,000 |  |  |  |
Costs in excess of billings, noncurrent |  | 29,500,000 |  |  | 20,100,000 |  |  |  |
Unbilled contracts receivable |  | 400,000 |  |  | 2,850,000 |  |  |  |
Depreciation, depletion and amortization, nonproduction |  | 46,733,000 |  |  | 41,220,000 |  | 39,734,000 |  |
Accumulated capitalized interest costs |  | 2,896,000 |  |  | 4,891,000 |  | 3,956,000 |  |
Original cost of fully depreciated property plant and equipment |  | $ 213,501,000 |  |  |  |  |  |  |
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. | 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 | 5 years |  |  |  |  |  |
Fair value terminal value | 3.00% | 3.00% | 3.00% |  |  |  |  |  |
Goodwill, impairment loss |  | $ 0 |  |  | 0 |  | 0 |  |
Unrecognized tax benefits |  | 4,519,000 |  |  | 4,825,000 |  | 4,709,000 |  |
Research and development arrangement, contract to perform for others, costs incurred, gross |  | 15,400,000 |  |  | 17,700,000 |  | 18,000,000 |  |
Net cash used in financing activities |  | 39,065,000 |  |  | (700,000) |  | $ 15,414,000 |  |
Accumulated other comprehensive loss |  | $ (34,112,000) |  |  | $ (60,481,000) |  |  |  |
U.S. Federal income tax provision (benefit) rate | 24.50% | 24.50% | 24.50% | 35.00% | 35.00% | 35.00% | 35.00% |  |
Selling, general and administrative expenses |  | $ 433,110,000 |  |  | $ 339,089,000 |  | $ 318,353,000 |  |
Home and Building Products (HBP) [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Number of operating segments | segment | 2 | 2 | 2 |  |  |  |  |  |
Home & Building Products [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Number of components | component | 2 | 2 | 2 |  |  |  |  |  |
Other Income [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Trading securities, realized loss |  | $ 1,251,000 |  |  |  |  | 13,000 |  |
Selling, general and administrative expenses [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Depreciation |  | $ 16,306,000 |  |  | 12,995,000 |  | 11,721,000 |  |
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% | 8.00% |  |  |  |  |  |
Home Depot [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Percentage of consolidated accounts receivable | 20.00% | 20.00% | 20.00% |  |  |  |  |  |
Contracts accounted for under percentage of completion [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Income (loss) from operations |  | $ 1,400,000 |  |  | $ 600,000 |  | (700,000) |  |
Designated as hedging instrument [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Contracts revenue | $ 12,000 |  |  | $ 14,500 |  |  |  |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.38 |  |  | $ 1.28 |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, before tax |  | $ 443,000 |  |  | $ 175,000 |  |  |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | 288,000 |  |  | 114,000 |  |  |  |
Gain (loss) on hedging activity |  | 657,000 |  |  | (1,458,000) |  |  |  |
Level 2 [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 68,114,000 |  |  | 68,723,000 |  |  |  |
Level 2 [Member] | Estimate of fair value measurement [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Trading securities |  | 2,644,000 |  |  | 3,352,000 |  |  |  |
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 |  | 2,086,000 |  |  | 1,000,000 |  |  |  |
Senior notes [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  | $ 990,000,000 |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Maturity period of highly liquid investments | 3 months | 3 months | 3 months |  |  |  |  |  |
Contracts expiration days | 92 days | 92 days | 92 days |  |  |  |  |  |
Fair value discount rates | 9.50% | 9.50% | 9.50% |  |  |  |  |  |
Finite-lived intangible asset, useful life | 25 years | 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 | 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 | 15 years |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Contracts expiration days | 31 days | 31 days | 31 days |  |  |  |  |  |
Fair value discount rates | 7.00% | 7.00% | 7.00% |  |  |  |  |  |
Finite-lived intangible asset, useful life | 8 years | 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 | 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 | 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 |  | $ (161,000) |  |  | 200,000 |  |  |  |
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 | 358 days | 358 days | 358 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 | 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 |  | $ 1,299,000 |  |  | 4,440,000 |  |  |  |
Accounting Standards Update 2016-09, Statutory Tax Withholding Component [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Net cash provided by operating activities |  | 2,291,000 |  |  |  |  |  |  |
Net cash used in financing activities |  | 2,291,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  | $ 475,000,000 | $ 475,000,000
Foreign currency translation adjustments [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Accumulated other comprehensive loss |  | (22,824,000) |  |  | (32,227,000) |  |  |  |
Shipping and Handling [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | 59,600,000 |  |  | 32,500,000 |  | 30,600,000 |  |
Advertising [Member] |  |  |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |  |  |
Selling, general and administrative expenses |  | $ 21,000,000 |  |  | $ 22,000,000 |  | $ 23,000,000 |  |

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