BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
NET SALES	$ 171,189	$ 140,191	$ 478,735	$ 411,954
Consolidated EBIT	18,635	17,840	53,118	45,020
Less: Interest expense, net	(1,213)	(320)	(2,752)	(917)
Earnings before income taxes	17,422	17,520	50,366	44,103
Filtration [Member]
Segment Reporting Information [Line Items]
NET SALES	71,179	54,396	198,869	145,758
Consolidated EBIT	11,945	12,163	34,296	29,511
Test [Member]
Segment Reporting Information [Line Items]
NET SALES	37,544	36,234	109,738	119,608
Consolidated EBIT	4,885	3,744	11,076	8,587
Utility Solutions [Member]
Segment Reporting Information [Line Items]
NET SALES	42,059	29,121	110,287	93,657
Consolidated EBIT	8,477	6,124	25,585	21,581
Technical Packaging [Member]
Segment Reporting Information [Line Items]
NET SALES	20,407	20,440	59,841	52,931
Consolidated EBIT	2,433	2,474	5,660	7,035
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (9,105)	$ (6,665)	$ (23,499)	$ (21,694)