Business Segment Information (Schedule Of Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Capital Expenditures	$ 12,714	$ 13,862	$ 10,799
Filtration [Member]
Capital Expenditures	7,000	6,600	4,400
Test [Member]
Capital Expenditures	1,400	3,200	2,200
USG [Member]
Capital Expenditures	4,100	3,900	3,600
Corporate [Member]
Capital Expenditures	$ 200	$ 200	$ 600