Business Segment Information (Schedule Of Capital Expenditures) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Capital Expenditures	$ 13,843	$ 12,444	$ 12,714
Filtration [Member]
Capital Expenditures	3,300	5,000	5,800
Test [Member]
Capital Expenditures	3,300	3,100	1,400
USG [Member]
Capital Expenditures	3,300	3,300	4,100
Technical Packaging [Member]
Capital Expenditures	3,900	1,000	1,200
Corporate [Member]
Capital Expenditures	$ 0	$ 0	$ 200