Inventories, net - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Inventory Disclosure [Abstract]
Additional amount that would have been reported in inventory if FIFO method had been used	$ 10,897	$ 10,496
LIFO effect	401	862
Cost of goods sold	0	610
Idle costs	$ 992	$ 1,412