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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, CAD in Thousands, AUD in Thousands | 12 Months Ended
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Sep. 30, 2016 AUD component segment unit company | Sep. 30, 2016 USD ($) component segment unit company $ / shares | Sep. 30, 2016 CAD component segment unit company | Sep. 30, 2015 AUD | Sep. 30, 2015 USD ($) $ / shares | Sep. 30, 2015 CAD | Sep. 30, 2014 USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount |  | $ 2,193,000 |  |  |  |  |
Number of operating segments | segment | 3 | 3 | 3 |  |  |  |
Cash in non U.S. bank accounts |  | $ 24,000,000 |  |  | $ 31,700,000 |  |
Debt instrument, interest rate, stated percentage |  | 4.00% |  |  |  |  |
Fair value of insurance contracts |  | $ 3,088,000 |  |  |  |  |
Proceeds from Sale of Trading Securities Held-for-investment |  | $ 1,000,000 |  |  |  |  |
Proceeds used to settle available-for-sale securities outstanding |  |  |  |  | 8,891,000 |  |
Gain, net of tax, reclassified |  |  |  |  | $ 870,000 |  |
Contracts revenue | CAD |  |  | CAD 4,855 |  |  | CAD 6,500 |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.31 |  |  | $ 1.33 |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | $ (42,894,000) |  |  | $ (60,178,000) |  |
Gain (loss) on hedging activity |  | (752,000) |  |  |  |  |
Foreign currency transaction gain (loss), realized |  | (157,000) |  |  | 280,000 |  |
Defined benefit plan, fair value of plan assets |  | $ 144,316,000 |  |  | 144,625,000 |  |
Contract period | 1 year | 1 year | 1 year |  |  |  |
Income (loss) from operations |  | $ 103,507,000 |  |  | 101,017,000 |  | $ 78,164,000
Provision for loss on contracts |  | 4,700,000 |  |  |  |  |
Customer program reserves and cash discounts netted against accounts receivable |  | 8,509,000 |  |  | 7,507,000 |  |
Costs in excess of billings, noncurrent |  | 12,000,000 |  |  | 16,500,000 |  |
Unbilled contracts receivable |  | 2,600,000 |  |  | 2,800,000 |  |
Depreciation, depletion and amortization, nonproduction |  | 62,689,000 |  |  | 62,144,000 |  | 59,488,000
Accumulated capitalized interest costs |  | 3,844,000 |  |  | 4,165,000 |  | 4,529,000
Original cost of fully depreciated property plant and equipment |  | $ 275,657,000 |  |  |  |  |
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 |  | 5,955,000 |  |  | 7,851,000 |  | 7,906,000
Research and development arrangement, contract to perform for others, costs incurred, gross |  | 26,200,000 |  |  | 25,600,000 |  | 23,400,000
Shipping, handling and transportation costs |  | 36,900,000 |  |  | 40,800,000 |  | 42,400,000
Advertising revenue cost |  | 22,000,000 |  |  | 24,000,000 |  | 24,000,000
Net cash used in financing activities |  | $ 8,888,000 |  |  | (44,851,000) |  | (27,930,000)
Home & Building Products [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Number of companies | company | 2 | 2 | 2 |  |  |  |
Income (loss) from operations |  | $ 79,682,000 |  |  | 58,883,000 |  | 40,538,000
Number of components | component | 2 | 2 | 2 |  |  |  |
Number of reporting units | unit | 1 | 1 | 1 |  |  |  |
Other Income [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Trading Securities, Realized Loss |  | $ 13,000 |  |  |  |  |
Recognized gain in other income |  |  |  |  | 489,000 |  |
Selling, general and administrative expenses [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Depreciation |  | $ 13,239,000 |  |  | 13,009,000 |  | 10,815,000
U.S. Government [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Percentage of consolidated accounts receivable | 16.00% | 16.00% | 16.00% |  |  |  |
P & G [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Percentage of consolidated accounts receivable | 7.00% | 7.00% | 7.00% |  |  |  |
Home Depot [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Percentage of consolidated accounts receivable | 14.00% | 14.00% | 14.00% |  |  |  |
Contracts accounted for under percentage of completion [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Income (loss) from operations |  | $ (700,000) |  |  | $ (400,000) |  | $ (400,000)
Designated as hedging instrument [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Contracts revenue | AUD | AUD 25,500 |  |  | AUD 25,531 |  |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.30 |  |  | $ 1.43 |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, before tax |  | $ 1,545,000 |  |  | $ 1,049,000 |  |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | 1,004,000 |  |  | 682,000 |  |
Gain (loss) on hedging activity |  | (752,000) |  |  | 1,223,000 |  |
Level 2 [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 59,427,000 |  |  | 84,222,000 |  |
Level 2 [Member] | Estimate of fair value measurement [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Trading securities |  | 1,314,000 |  |  | 1,374,000 |  |
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 |  | 1,000,000 |  |  | 1,000,000 |  |
Senior notes [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Long-term debt, fair value |  | 725,000,000 |  |  |  |  |
Convert. debt due 2017 [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Long-term debt, fair value |  | $ 121,563,000 |  |  |  |  |
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 | 270 days | 270 days | 270 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 | 14 days | 14 days | 14 days |  |  |  |
Fair value discount rates | 7.50% | 7.50% | 7.50% |  |  |  |
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 |  | $ 136,000 |  |  | 257,000 |  |
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 | 270 days | 270 days | 270 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 | 14 days | 14 days | 14 days |  |  |  |
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 |  |  |  |  |
Accounting Standards Update 2015-17 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |  |
Deferred tax assets, noncurrent |  |  |  |  | (3,793,000) |  |
Deferred tax liabilities, noncurrent |  |  |  |  | $ (14,827,000) |  |

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