Business Segment Information (Schedule Of Identifiable Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Identifiable Assets	$ 864,208	$ 845,906
Filtration [Member]
Identifiable Assets	141,800	131,500
Test [Member]
Identifiable Assets	117,800	114,600
USG [Member]
Identifiable Assets	80,600	98,600
Corporate [Member]
Identifiable Assets	$ 524,000	$ 501,200