FAIR VALUE MEASUREMENTS	9 Months Ended
FAIR VALUE MEASUREMENTS	Jun. 30, 2014
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 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 debt is based upon current market rates. The fair values of Griffon’s senior notes due 2022 and 2017 4% convertible notes approximated $594,000 and $113,400, respectively, on June 30, 2014. Fair values were based upon quoted market prices (level 1 inputs). Items Measured at Fair Value on a Recurring Basis Insurance contracts with values of $3,594 (level 2 inputs) at June 30, 2014, are measured and recorded at fair value based upon quoted prices in active markets for similar assets. Trading securities with values of $11,160 (level 1 inputs) at June 30, 2014, are measured and recorded at fair value based upon quoted prices in active markets for identical assets. At June 30, 2014, Griffon had $4,172 and $1,750 of Australian dollar contracts and Canadian dollar contracts, respectively, at a weighted average rate of $1.06 and $1.07, respectively. The contracts, which protect Australia and Canada operations from currency fluctuations for U.S. dollar based purchases, do not qualify for hedge accounting and a fair value loss of $192 and $125 was recorded in Other assets and to Other income for the outstanding contracts, based on similar contract values (level 2 inputs), for the quarter and nine months ended June 30, 2014, respectively. All contracts expire in 24 to 114 days.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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