GOODWILL AND OTHER INTANGIBLE ASSETS (Schedule Of Changes In The Carrying Amount Of Goodwill Attributable To Business Segment) (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2017 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 323,616
Acquisition activity	30,700
Foreign currency translation	(300)
Goodwill, Ending Balance	353,984
Utility Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	226,200
Acquisition activity	0
Foreign currency translation	0
Goodwill, Ending Balance	226,200
Test [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	34,100
Acquisition activity	0
Foreign currency translation	0
Goodwill, Ending Balance	34,100
Filtration [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	43,900
Acquisition activity	30,700
Foreign currency translation	0
Goodwill, Ending Balance	74,600
Technical Packaging [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	19,400
Foreign currency translation	(300)
Goodwill, Ending Balance	$ 19,100