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INCOME TAXES - Effective income tax rate (Details)
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 21.00%
State and local income taxes, net of Federal tax benefit, if applicable 2.70% 3.20% 3.30%
Goodwill 0.00% 0.00% (3.50%)
Impact of foreign operations (3.50%) (1.20%) (0.30%)
Sale of Israeli businesses 0 0 (0.008)
Fines and penalties 0.00% (4.60%) 0.00%
Other (2.00%) (0.80%) 1.10%
Valuation allowance changes 3.60% (0.90%) (5.20%)
Effective income tax rate 21.80% 16.70% 15.60%