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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)

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