Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss
Balance at Sep. 30, 2020	$ 15,443	$ 1,124	$ 1,913	$ 117,109	$ (104,703)
Balance (in shares) at Sep. 30, 2020		112,405
Increase (Decrease) in Stockholders' Equity
Net earnings	239,858			239,858
Other comprehensive income, net of tax	10,062				10,062
Share-based compensation	11,656		11,656
Stock issued for equity awards	4,768	$ 6	4,762
Stock issued for equity awards (in shares)		579
Employee withholding taxes paid related to net share settlement	(1,046)	$ (1)	(1,045)
Employee withholding taxes paid related to net share settlement (in shares)		(71)
Balance at Sep. 30, 2021	280,741	$ 1,129	17,286	356,967	(94,641)
Balance (in shares) at Sep. 30, 2021		112,913
Increase (Decrease) in Stockholders' Equity
Net earnings	183,553			183,553
Other comprehensive income, net of tax	(57,206)				(57,206)
Repurchases of common stock	$ (130,328)	$ (68)	(29,912)	(100,348)
Repurchases of common stock (in shares)	(6,832)	(6,833)
Share-based compensation	$ 9,944		9,944
Stock issued for equity awards	8,112	$ 10	8,102
Stock issued for equity awards (in shares)		949
Employee withholding taxes paid related to net share settlement	(1,180)	$ (1)	(1,179)
Employee withholding taxes paid related to net share settlement (in shares)		(59)
Balance at Sep. 30, 2022	$ 293,636	$ 1,070	4,241	440,172	(151,847)
Balance (in shares) at Sep. 30, 2022	106,970	106,970
Increase (Decrease) in Stockholders' Equity
Net earnings	$ 184,600			184,600
Other comprehensive income, net of tax	29,083				29,083
Repurchases of common stock	$ (15,150)	$ (15)	(15,135)
Repurchases of common stock (in shares)	(1,511)	(1,511)
Share-based compensation	$ 15,862		15,862
Stock issued for equity awards	1,885	$ 9	1,876
Stock issued for equity awards (in shares)		900
Employee withholding taxes paid related to net share settlement	(1,168)	$ (1)	(1,167)
Employee withholding taxes paid related to net share settlement (in shares)		(93)
Balance at Sep. 30, 2023	$ 508,748	$ 1,063	$ 5,677	$ 624,772	$ (122,764)
Balance (in shares) at Sep. 30, 2023	106,266	106,266