SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Deferred tax valuation allowance (deducted from net deferred tax assets)
Activity in valuation and qualifying accounts
Balance at beginning of period	$ 17,193	$ 16,029	$ 12,259
Charged (credited) to expense	(143)	1,164	3,770
Reductions	0	0	0
Balance at end of period	17,050	17,193	16,029
Allowance for doubtful accounts (deducted from accounts receivable)
Activity in valuation and qualifying accounts
Balance at beginning of period	1,680	1,424	449
Charged (credited) to expense	395	839	1,392
Reductions	(1,298)	(583)	(417)
Balance at end of period	777	1,680	1,424
Provision for inventory allowance (deducted from inventory)
Activity in valuation and qualifying accounts
Balance at beginning of period	3	1,044	96
Charged (credited) to expense	540	163	1,048
Reductions	(459)	(1,204)	(100)
Balance at end of period	$ 84	$ 3	$ 1,044