INVENTORIES, NET - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Inventory Disclosure [Abstract]
Inventories at lower of LIFO cost or market	81.00%	81.00%
FIFO inventory, (lower) higher than reported	$ 8,995	$ (14,425)
Effect of LIFO inventory liquidation on operating income	2,757	370
Excess and obsolete inventory reserve	$ 23,192	$ 29,176