Business Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Identifiable Assets	$ 1,265,122	$ 1,260,444
Filtration [Member]
Identifiable Assets	204,700	194,200
Test [Member]
Identifiable Assets	138,300	132,200
USG [Member]
Identifiable Assets	176,900	175,500
Technical Packaging [Member]
Identifiable Assets	50,900	47,100
Corporate – Goodwill [Member]
Identifiable Assets	381,700	377,900
Corporate – Other assets [Member]
Identifiable Assets	$ 312,600	$ 333,500