Business Segment Information - Schedule Of Geographic Information Net Sales (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Net Sales	$ 715,440	$ 730,471	$ 726,044
United States [Member]
Net Sales	516,959	529,417	537,200
Asia [Member]
Net Sales	92,300	96,300	86,200
Europe [Member]
Net Sales	53,500	51,300	45,000
Canada [Member]
Net Sales	27,000	31,700	33,000
India [Member]
Net Sales	12,400	10,300	11,700
Other [Member]
Net Sales	$ 13,200	$ 11,500	$ 12,900