BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Consolidated NET SALES	$ 174,778	$ 161,178	$ 348,273	$ 307,546
Consolidated EBIT	15,620	17,674	30,606	34,483
Less: Interest expense	(2,036)	(855)	(4,221)	(1,539)
Earnings before income taxes	13,584	16,819	26,385	32,944
Filtration [Member]
Segment Reporting Information [Line Items]
Consolidated NET SALES	65,775	68,906	125,810	127,690
Consolidated EBIT	11,118	11,625	20,764	22,351
Test [Member]
Segment Reporting Information [Line Items]
Consolidated NET SALES	40,805	38,367	78,334	72,194
Consolidated EBIT	5,300	3,766	7,895	6,191
Utility Solutions [Member]
Segment Reporting Information [Line Items]
Consolidated NET SALES	46,699	32,671	102,453	68,228
Consolidated EBIT	5,626	7,434	16,277	17,108
Technical Packaging [Member]
Segment Reporting Information [Line Items]
Consolidated NET SALES	21,499	21,234	41,676	39,434
Consolidated EBIT	1,885	2,196	2,850	3,227
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (8,309)	$ (7,347)	$ (17,180)	$ (14,394)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

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The net amount of operating interest income (expense).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.10)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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