Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock, Common	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning balance (in shares) at Sep. 30, 2022		41,950	6,413
Beginning balance at Sep. 30, 2022	$ 501,513	$ 420	$ (58,172)	$ 385,244	$ 200,075	$ (26,054)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,678				11,678
Other comprehensive (loss) income	1,467					1,467
Employee stock purchase plan issuances (in shares)			(40)
Employee stock purchase plan issuances	1,170		$ 380	790
Taxes paid for net share settlement of share-based payment awards (in shares)			91
Taxes paid for net share settlement of share-based payment awards	(3,654)		$ (3,654)
Issuance of stock under stock award plans (in shares)		375
Issuance of stock under stock award plans	1,672	$ 3		1,669
Stock-based compensation expense	6,333			6,333
Ending balance (in shares) at Mar. 31, 2023		42,325	6,464
Ending balance at Mar. 31, 2023	520,179	$ 423	$ (61,446)	394,036	211,753	(24,587)
Beginning balance (in shares) at Dec. 31, 2022		42,199	6,465
Beginning balance at Dec. 31, 2022	509,928	$ 422	$ (60,973)	389,390	205,854	(24,765)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,899				5,899
Other comprehensive (loss) income	178					178
Employee stock purchase plan issuances (in shares)			(20)
Employee stock purchase plan issuances	576		$ 194	382
Taxes paid for net share settlement of share-based payment awards (in shares)			19
Taxes paid for net share settlement of share-based payment awards	(667)		$ (667)
Issuance of stock under stock award plans (in shares)		126
Issuance of stock under stock award plans	800	$ 1		799
Stock-based compensation expense	3,465			3,465
Ending balance (in shares) at Mar. 31, 2023		42,325	6,464
Ending balance at Mar. 31, 2023	520,179	$ 423	$ (61,446)	394,036	211,753	(24,587)
Beginning balance (in shares) at Sep. 30, 2023		42,501	6,436
Beginning balance at Sep. 30, 2023	540,488	$ 425	$ (61,506)	403,735	224,845	(27,011)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	940				940
Other comprehensive (loss) income	2,348					2,348
Employee stock purchase plan issuances (in shares)			(50)
Employee stock purchase plan issuances	1,112		$ 491	621
Taxes paid for net share settlement of share-based payment awards (in shares)			106
Taxes paid for net share settlement of share-based payment awards	(2,785)		$ (2,668)	(117)
Issuance of stock under stock award plans (in shares)		353
Issuance of stock under stock award plans	945	$ 4		941
Stock-based compensation expense	6,579			6,579
Ending balance (in shares) at Mar. 31, 2024		42,854	6,492
Ending balance at Mar. 31, 2024	549,627	$ 429	$ (63,683)	411,759	225,785	(24,663)
Beginning balance (in shares) at Dec. 31, 2023		42,749	6,500
Beginning balance at Dec. 31, 2023	542,075	$ 427	$ (63,410)	407,330	221,791	(24,063)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,994				3,994
Other comprehensive (loss) income	(600)					(600)
Employee stock purchase plan issuances (in shares)			(26)
Employee stock purchase plan issuances	581		$ 260	321
Taxes paid for net share settlement of share-based payment awards (in shares)			18
Taxes paid for net share settlement of share-based payment awards	(617)		$ (533)	84
Issuance of stock under stock award plans (in shares)		105
Issuance of stock under stock award plans	721	$ 2		719
Stock-based compensation expense	3,473			3,473
Ending balance (in shares) at Mar. 31, 2024		42,854	6,492
Ending balance at Mar. 31, 2024	$ 549,627	$ 429	$ (63,683)	$ 411,759	$ 225,785	$ (24,663)