Goodwill and Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill Attributable To Business Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 291,157	$ 282,300
Adjustments	32,400	8,900
Goodwill, Ending Balance	323,616	291,157
Utility Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	226,200	216,800
Adjustments	0	9,400
Goodwill, Ending Balance	226,200	226,200
Test [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	34,200	34,700
Adjustments	(100)	(500)
Goodwill, Ending Balance	34,100	34,200
Filtration [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	26,000	26,000
Adjustments	17,900	0
Goodwill, Ending Balance	43,900	26,000
Technical Packaging [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	4,800	4,800
Adjustments	14,600	0
Goodwill, Ending Balance	$ 19,400	$ 4,800