Business Segment Information (Schedule Of Identifiable Assets) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Identifiable Assets	$ 845,906	$ 1,092,328
Filtration [Member]
Identifiable Assets	131,500	122,900
Test [Member]
Identifiable Assets	114,600	102,400
USG [Member]
Identifiable Assets	98,600	72,300
Corporate [Member]
Identifiable Assets	$ 501,200	$ 794,700