CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings
Beginning balance (in shares) at Sep. 30, 2024		31,048
Beginning balance at Sep. 30, 2024	$ 1,232,111	$ 31	$ 853,895	$ 378,185
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) and comprehensive income (loss)	3,130			3,130
Stock-based compensation expense	1,913		1,913
Shares issued under employee stock plans, net (in shares)		267
Shares issued under employee stock plans, net	0
Forfeiture and other settlements of restricted stock (in shares)		(19)
Forfeiture and other settlements of restricted stock	0
Common stock redeemed for tax liability (in shares)		(94)
Common stock redeemed for tax liability	$ (3,106)		(3,106)
Share repurchases (in shares)	0
Ending balance (in shares) at Dec. 31, 2024		31,202
Ending balance at Dec. 31, 2024	$ 1,234,048	$ 31	852,702	381,315
Beginning balance (in shares) at Sep. 30, 2025		29,762
Beginning balance at Sep. 30, 2025	1,248,906	$ 30	825,103	423,773
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) and comprehensive income (loss)	(32,597)			(32,597)
Stock-based compensation expense	1,554		1,554
Shares issued under employee stock plans, net (in shares)		564
Shares issued under employee stock plans, net	0	$ 1	(1)
Forfeiture and other settlements of restricted stock (in shares)		(7)
Forfeiture and other settlements of restricted stock	0
Common stock redeemed for tax liability (in shares)		(115)
Common stock redeemed for tax liability	$ (2,488)		(2,488)
Share repurchases (in shares)	(697)	(697)
Share repurchases	$ (15,127)	$ (1)	(15,126)
Ending balance (in shares) at Dec. 31, 2025		29,507
Ending balance at Dec. 31, 2025	$ 1,200,248	$ 30	$ 809,042	$ 391,176