BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
NET SALES	$ 193,949	$ 174,778	$ 376,546	$ 348,273
Consolidated EBIT	23,280	15,620	48,427	30,606
Less: Interest expense	(1,925)	(2,036)	(3,815)	(4,221)
Earnings before income taxes	21,355	13,584	44,612	26,385
Filtration [Member]
Segment Reporting Information [Line Items]
NET SALES	79,478	65,775	145,702	125,810
Consolidated EBIT	17,443	11,118	28,053	20,764
Test [Member]
Segment Reporting Information [Line Items]
NET SALES	42,875	40,805	84,161	78,334
Consolidated EBIT	5,554	5,300	8,864	7,895
USG [Member]
Segment Reporting Information [Line Items]
NET SALES	48,890	46,699	104,745	102,453
Consolidated EBIT	8,767	5,626	30,313	16,277
Technical Packaging [Member]
Segment Reporting Information [Line Items]
NET SALES	22,706	21,499	41,938	41,676
Consolidated EBIT	1,602	1,885	1,708	2,850
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (10,086)	$ (8,309)	$ (20,511)	$ (17,180)

Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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