Business Segment Information (Schedule Of Geographic Information Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Net Sales	$ 159,505	$ 140,191	$ 138,930	$ 132,833	$ 153,612	$ 134,191	$ 128,941	$ 120,547	$ 571,459	$ 537,291	$ 531,120
United States [Member]
Net Sales									403,600	385,500	374,000
Asia [Member]
Net Sales									68,100	70,400	59,900
Europe [Member]
Net Sales									71,600	46,600	62,000
Canada [Member]
Net Sales									12,900	11,600	10,400
India [Member]
Net Sales									2,900	4,300	3,300
Other [Member]
Net Sales									$ 12,400	$ 18,900	$ 21,500