CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance (in shares) at Sep. 30, 2022		44,680,000
Beginning balance at Sep. 30, 2022	$ 170,979	$ 44	$ 216,493	$ (28,219)	$ (17,339)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	98,952	100,000
Exercise of stock options	$ 727		727
Settlement of restricted stock units (in shares)		689,000
Settlement of restricted stock units	0	$ 2	(2)
Issuance of common stock under employee stock purchase plan (in shares)		122,000
Issuance of common stock under employee stock purchase plan	1,010		1,010
Stock-based compensation expense	10,463		10,463
Components of comprehensive income (loss), net of tax:
Net income (loss)	8,027				8,027
Currency translation adjustment	13,093			13,093
Change in unrealized gain (loss) on investments	889			889
Ending balance (in shares) at Sep. 30, 2023		45,591,000
Ending balance at Sep. 30, 2023	$ 205,188	$ 46	228,691	(14,237)	(9,312)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	189,559	274,000
Exercise of stock options	$ 1,889		1,889
Settlement of restricted stock units (in shares)		975,000
Settlement of restricted stock units	0	$ 1	(1)
Issuance of common stock under employee stock purchase plan (in shares)		89,000
Issuance of common stock under employee stock purchase plan	652		652
Acquisition-related shares issued (in shares)		311,000
Acquisition-related shares issued	3,471		3,471
Stock-based compensation expense	12,624		12,624
Repurchase and retirements of common stock (in shares)		(2,241,000)
Repurchases and retirements of common stock	(24,236)	$ (2)			(24,234)
Components of comprehensive income (loss), net of tax:
Net income (loss)	3,278				3,278
Currency translation adjustment	11,634			11,634
Change in unrealized gain (loss) on investments	$ 301			301
Ending balance (in shares) at Sep. 30, 2024	44,998,939	44,999,000
Ending balance at Sep. 30, 2024	$ 214,801	$ 45	247,326	(2,302)	(30,268)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)	294,006	160,000
Exercise of stock options	$ 322		322
Settlement of restricted stock units (in shares)		836,000
Settlement of restricted stock units	0	$ 2	(2)
Issuance of common stock under employee stock purchase plan (in shares)		176,000
Issuance of common stock under employee stock purchase plan	1,379		1,379
Stock-based compensation expense	16,810		16,810
Repurchase and retirements of common stock (in shares)		(534,000)
Repurchases and retirements of common stock	(4,738)	$ (1)			(4,737)
Components of comprehensive income (loss), net of tax:
Net income (loss)	8,796				8,796
Currency translation adjustment	2,956			2,956
Change in unrealized gain (loss) on investments	$ (68)			(68)
Ending balance (in shares) at Sep. 30, 2025	45,636,531	45,637,000
Ending balance at Sep. 30, 2025	$ 240,258	$ 46	$ 265,835	$ 586	$ (26,209)