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, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 282,337	$ 282,900
Adjustments	8,900	(600)
Goodwill, Ending Balance	291,157	282,337
Utility Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	216,800	217,300
Adjustments	9,400	(500)
Goodwill, Ending Balance	226,200	216,800
Test [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	34,700	35,000
Adjustments	(500)	(300)
Goodwill, Ending Balance	34,200	34,700
Filtration [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	30,800	30,600
Adjustments	0	200
Goodwill, Ending Balance	$ 30,800	$ 30,800