CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Retained Earnings
Beginning balance (in shares) at Sep. 30, 2024		31,048,000
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)	15,908			15,908
Stock-based compensation expense	3,625		3,625
Stock option exercises (in shares)		11,000
Stock option exercises	106		106
Shares issued under employee stock plans, net (in shares)		274,000
Forfeiture and other settlements of restricted stock (in shares)		(30,000)
Common stock redeemed for tax liability (in shares)		(95,000)
Common stock redeemed for tax liability	$ (3,121)		(3,121)
Share repurchases (in shares)	(905,000)	(905,000)
Share repurchases	$ (20,562)	$ (1)	(20,561)
Ending balance (in shares) at Mar. 31, 2025		30,303,000
Ending balance at Mar. 31, 2025	1,228,067	$ 30	833,944	394,093
Beginning balance (in shares) at Dec. 31, 2024		31,202,000
Beginning balance at Dec. 31, 2024	1,234,048	$ 31	852,702	381,315
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) and comprehensive income (loss)	12,778			12,778
Stock-based compensation expense	1,712		1,712
Stock option exercises (in shares)		11,000
Stock option exercises	106		106
Shares issued under employee stock plans, net (in shares)		7,000
Forfeiture and other settlements of restricted stock (in shares)		(11,000)
Common stock redeemed for tax liability (in shares)		(1,000)
Common stock redeemed for tax liability	$ (15)		(15)
Share repurchases (in shares)	(905,000)	(905,000)
Share repurchases	$ (20,562)	$ (1)	(20,561)
Ending balance (in shares) at Mar. 31, 2025		30,303,000
Ending balance at Mar. 31, 2025	$ 1,228,067	$ 30	833,944	394,093
Beginning balance (in shares) at Sep. 30, 2025	29,762,293	29,762,000
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)	(33,501)			(33,501)
Stock-based compensation expense	3,430		3,430
Shares issued under employee stock plans, net (in shares)		565,000
Shares issued under employee stock plans, net		$ 1	(1)
Forfeiture and other settlements of restricted stock (in shares)		(7,000)
Common stock redeemed for tax liability (in shares)		(115,000)
Common stock redeemed for tax liability	$ (2,492)		(2,492)
Share repurchases (in shares)	(1,900,000)	(1,873,000)
Share repurchases	$ (45,563)	$ (3)	(45,560)
Ending balance (in shares) at Mar. 31, 2026	28,331,558	28,332,000
Ending balance at Mar. 31, 2026	$ 1,170,780	$ 28	780,480	390,272
Beginning balance (in shares) at Dec. 31, 2025		29,507,000
Beginning balance at Dec. 31, 2025	1,200,248	$ 30	809,042	391,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss) and comprehensive income (loss)	(904)			(904)
Stock-based compensation expense	1,876		1,876
Shares issued under employee stock plans, net (in shares)		1,000
Common stock redeemed for tax liability	$ (4)		(4)
Share repurchases (in shares)	(1,200,000)	(1,176,000)
Share repurchases	$ (30,436)	$ (2)	(30,434)
Ending balance (in shares) at Mar. 31, 2026	28,331,558	28,332,000
Ending balance at Mar. 31, 2026	$ 1,170,780	$ 28	$ 780,480	$ 390,272