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, 2018 USD ($)
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 377,879
Acquisition activity	3,700
Foreign currency translation	500
Goodwill, Ending Balance	382,141
Filtration [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	73,700
Acquisition activity	0
Foreign currency translation	0
Goodwill, Ending Balance	73,700
Test [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	34,100
Acquisition activity	0
Foreign currency translation	0
Goodwill, Ending Balance	34,100
Utility Solutions [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	250,200
Acquisition activity	3,700
Foreign currency translation	(200)
Goodwill, Ending Balance	253,700
Technical Packaging [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	19,900
Acquisition activity	0
Foreign currency translation	700
Goodwill, Ending Balance	$ 20,600