Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Sep. 30, 2019	$ 348,978	$ 346	$ (54,339)	$ 266,567	$ 161,919	$ (25,515)
Beginning balance (in shares) at Sep. 30, 2019		34,608	6,367
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	8,411				8,411
Other comprehensive income (loss)	1,698					1,698
Employee stock purchase issuances (in shares)			(118)
Employee stock purchase issuances	1,065		$ 1,021	44
Taxes paid for net share settlement of share-based payment awards (in shares)			104
Taxes paid for net share settlement of share-based payment awards	(1,791)		$ (1,791)
Issuance of stock under stock award plans (in shares)		905
Issuance of stock under stock award plans	5,902	$ 9		5,893
Stock-based compensation expense	7,237			7,237
Ending balance (in shares) at Sep. 30, 2020		35,513	6,353
Ending balance at Sep. 30, 2020	371,500	$ 355	$ (55,109)	279,741	170,330	(23,817)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,366				10,366
Other comprehensive income (loss)	1,071					1,071
Stock Issued During Period, Shares, New Issues		4,025
Stock Issued During Period, Value, New Issues		$ 40
Proceeds from Issuance of Debt	73,830			73,790
Other	(4)				(4)
Employee stock purchase issuances (in shares)			(79)
Employee stock purchase issuances	1,214		$ 694	520
Taxes paid for net share settlement of share-based payment awards (in shares)			117
Taxes paid for net share settlement of share-based payment awards	(2,120)		$ (2,120)
Issuance of stock under stock award plans (in shares)		1,115
Issuance of stock under stock award plans	8,525	$ 12		8,513
Stock-based compensation expense	8,135			8,135
Ending balance (in shares) at Sep. 30, 2021		40,653	6,391
Ending balance at Sep. 30, 2021	472,517	$ 407	$ (56,535)	370,699	180,692	(22,746)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,383				19,383
Other comprehensive income (loss)	$ (3,308)					(3,308)
Stock Issued During Period, Shares, New Issues	4,025
Employee stock purchase issuances (in shares)			(80)
Employee stock purchase issuances	$ 1,500		$ 726	774
Taxes paid for net share settlement of share-based payment awards (in shares)			102
Taxes paid for net share settlement of share-based payment awards	(6,662)		$ (2,363)	(4,299)
Issuance of stock under stock award plans (in shares)		1,297
Issuance of stock under stock award plans	9,505	$ 13		9,492
Stock-based compensation expense	8,578			8,578
Ending balance (in shares) at Sep. 30, 2022		41,950	6,413
Ending balance at Sep. 30, 2022	$ 501,513	$ 420	$ (58,172)	$ 385,244	$ 200,075	$ (26,054)