Business Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Identifiable Assets	$ 1,260,444	$ 978,371
Filtration [Member]
Identifiable Assets	194,200	143,500
Test [Member]
Identifiable Assets	132,200	110,900
USG [Member]
Identifiable Assets	175,500	85,400
Technical Packaging [Member]
Identifiable Assets	47,100	40,900
Corporate Goodwill [Member]
Identifiable Assets	377,900	323,600
Corporate Other Assets [Member]
Identifiable Assets	$ 333,500	$ 274,100