BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
NET SALES	$ 182,597	$ 173,495
Consolidated EBIT	25,147	14,986
Less: Interest expense	(1,890)	(2,185)
Earnings before income taxes	23,257	12,801
Filtration [Member]
Segment Reporting Information [Line Items]
NET SALES	66,224	60,035
Consolidated EBIT	10,610	9,645
Test [Member]
Segment Reporting Information [Line Items]
NET SALES	41,286	37,530
Consolidated EBIT	3,310	2,596
USG [Member]
Segment Reporting Information [Line Items]
NET SALES	55,855	55,754
Consolidated EBIT	21,546	10,651
Technical Packaging [Member]
Segment Reporting Information [Line Items]
NET SALES	19,232	20,176
Consolidated EBIT	106	965
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (10,425)	$ (8,871)

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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