OTHER INCOME (EXPENSE)	9 Months Ended
Jun. 30, 2026
Other Income and Expenses [Abstract]
OTHER INCOME (EXPENSE)	OTHER INCOME (EXPENSE) For the quarters ended June 30, 2026 and 2025, Other income (expense) of $(2,576) and $272, respectively, includes ($71) and $326, respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $1,954 and $91, respectively, net losses on investments of $564 and $424, respectively, and royalty income of $471 and $501, respectively. Net periodic benefit plan expense includes a charge of $1,608 recorded in the three months ended June 30, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 14, Employee Benefit Plans for additional details. For the nine months ended June 30, 2026 and 2025, Other income (expense) of $(5,192) and $858, respectively, includes $213 and $50, respectively, of net currency exchange gains in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $5,867 and $272, respectively, net losses on investments of $571 and $370, respectively, and royalty income of $1,434 and $1,647, respectively. Net periodic benefit plan expense includes a charge of $4,826 recorded in the nine months ended June 30, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 14, Employee Benefit Plans for additional details.

For the quarters ended June 30, 2026 and 2025, Other income (expense) of $(2,576) and $272, respectively, includes ($71) and $326, respectively, of net currency exchange gains (losses) in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $1,954 and $91, respectively, net losses on investments of $564 and $424, respectively, and royalty income of $471 and $501, respectively. Net periodic benefit plan expense includes a charge of $1,608 recorded in the three months ended June 30, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 14, Employee Benefit Plans for additional details.

For the nine months ended June 30, 2026 and 2025, Other income (expense) of $(5,192) and $858, respectively, includes $213 and $50, respectively, of net currency exchange gains in connection with the translation of receivables and payables denominated in currencies other than the functional currencies of Griffon and its subsidiaries, net periodic benefit plan expense of $5,867 and $272, respectively, net losses on investments of $571 and $370, respectively, and royalty income of $1,434 and $1,647, respectively. Net periodic benefit plan expense includes a charge of $4,826 recorded in the nine months ended June 30, 2026 associated with the establishment of a new retiree medical plan. Refer to Note 14, Employee Benefit Plans for additional details.