v3.26.1
CREDIT LOSSES (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Credit Loss [Abstract]
Allowance for sales returns
$ 1,960
$ 2,429
X
- Definition
Accounts Receivable, Allowance for Sales Returns
+ References
No definition available.
+ Details
Name:
gff_AccountsReceivableAllowanceForSalesReturns
Namespace Prefix:
gff_
Data Type:
xbrli:monetaryItemType
Balance Type:
credit
Period Type:
instant
X
- References
No definition available.
+ Details
Name:
us-gaap_CreditLossAbstract
Namespace Prefix:
us-gaap_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration