Goodwill And Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill Attributable To Business Segment) (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 282,949,000	$ 279,600,000
Acquisitions/adjustments	(600,000)	3,300,000
Goodwill, Ending Balance	282,337,000	282,949,000
Utility Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	217,300,000	215,600,000
Acquisitions/adjustments	(500,000)	1,700,000
Goodwill, Ending Balance	216,800,000	217,300,000
Test [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	35,000,000	34,700,000
Acquisitions/adjustments	(300,000)	300,000
Goodwill, Ending Balance	34,700,000	35,000,000
Filtration [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	30,600,000	29,300,000
Acquisitions/adjustments	200,000	1,300,000
Goodwill, Ending Balance	$ 30,800,000	$ 30,600,000