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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, 2015 AUD component segment unit company | Sep. 30, 2015 USD ($) component segment unit company $ / shares | Sep. 30, 2015 CAD component segment unit company | Sep. 30, 2014 AUD | Sep. 30, 2014 USD ($) $ / shares | Sep. 30, 2013 USD ($)
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Number of operating segments | segment | 3 | 3 | 3 |  |  |
Number of companies | company | 2 | 2 | 2 |  |  |
Cash in non U.S. bank accounts |  | $ 31,700,000 |  |  | $ 34,500,000 |
Debt instrument, interest rate, stated percentage |  | 4.00% |  |  |  |
Fair value of insurance contracts |  | $ 2,942,000 |  |  |  |
Proceeds used to settle available-for-sale securities outstanding |  | 8,891,000 |  |  |  |
Gain, net of tax, reclassified |  | $ 870,000 |  |  |  |
Contracts revenue |  |  | CAD 6,500 | AUD 3,197 |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.33 |  |  | $ 1.14 |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | $ (60,178,000) |  |  | $ (3,820,000) |
Gain (loss) on hedging activity |  | 1,223,000 |  |  | 0 | $ 0
Foreign currency transaction gain (loss), realized |  | (274,000) |  |  | (141,000) |
Defined benefit plan, fair value of plan assets |  | $ 144,625,000 |  |  | 154,966,000 |
Contract period | 1 year | 1 year | 1 year |  |  |
Income (loss) from operations |  | $ 101,017,000 |  |  | 78,164,000 | 63,854,000
Provision for loss on contracts |  | 10,600,000 |  |  |  |
Customer program reserves and cash discounts netted against accounts receivable |  | 7,507,000 |  |  | 9,295,000 |
Costs in excess of billings, noncurrent |  | 16,500,000 |  |  | 8,400,000 |
Unbilled contracts receivable |  | 2,800,000 |  |  | 2,200,000 |
Depreciation, depletion and amortization, nonproduction |  | 62,144,000 |  |  | 59,488,000 | 62,911,000
Accumulated capitalized interest costs |  | 4,165,000 |  |  | 4,529,000 | 4,030,000
Original cost of fully depreciated property plant and equipment |  | $ 18,146,000 |  |  |  |
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 |  | 7,851,000 |  |  | 7,906,000 | 10,520,000
Research and development arrangement, contract to perform for others, costs incurred, gross |  | 25,600,000 |  |  | 23,400,000 | 22,400,000
Shipping, handling and transportation costs |  | 40,800,000 |  |  | 42,400,000 | 39,600,000
Advertising revenue cost |  | 24,000,000 |  |  | 24,000,000 | 23,000,000
Home & Building Products [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Income (loss) from operations |  | $ 58,883,000 |  |  | 40,538,000 | 26,130,000
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] |  |  |  |  |  |
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 |  | $ 13,009,000 |  |  | 10,815,000 | 12,733,000
U.S. Government [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Percentage of consolidated accounts receivable | 13.00% | 13.00% | 13.00% |  |  |
P & G [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 | 10.00% | 10.00% | 10.00% |  |  |
Contracts accounted for under percentage of completion [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Income (loss) from operations |  | $ (400,000) |  |  | $ (400,000) | $ 3,400,000
Designated as hedging instrument [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Contracts revenue | AUD | AUD 25,531 |  |  | AUD 4,975 |  |
Contracts weighted average rate price (in Dollars per share) | $ / shares |  | $ 1.43 |  |  | $ 1.14 |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, before tax |  | $ 1,049,000 |  |  | $ 386,000 |
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax |  | 682,000 |  |  | 252,000 |
Gain (loss) on hedging activity |  | 1,223,000 |  |  |  |
Level 1 [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 60,403,000 |  |  | 78,229,000 |
Level 1 [Member] | Estimate of fair value measurement [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities |  |  |  |  | 9,770,000 |
Level 1 [Member] | Portion at other than fair value measurement [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Available-for-sale securities |  |  |  |  | 8,400,000 |
Level 2 [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Defined benefit plan, fair value of plan assets |  | 84,222,000 |  |  | 76,737,000 |
Level 2 [Member] | Estimate of fair value measurement [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Trading securities |  | 1,374,000 |  |  | 1,274,000 |
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 |  | 570,000,000 |  |  |  |
Convert. debt due 2017 [Member] |  |  |  |  |  |
DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) [Line Items] |  |  |  |  |  |
Long-term debt, fair value |  | $ 118,875,000 |  |  |  |
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 | 360 days | 360 days | 360 days |  |  |
Fair value discount rates | 10.00% | 10.00% | 10.00% |  |  |
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 | 30 days | 30 days | 30 days |  |  |
Fair value discount rates | 9.00% | 9.00% | 9.00% |  |  |
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 |  |  |

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