BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 138,930	$ 128,941	$ 271,763	$ 249,488
Consolidated EBIT	13,983	13,002	27,180	26,772
Less: Interest expense	(368)	(213)	(597)	(408)
Earnings before income taxes	13,615	12,789	26,583	26,364
Filtration [Member]
Segment Reporting Information [Line Items]
Net sales	49,045	48,773	91,361	89,657
Consolidated EBIT	9,064	10,987	17,348	18,337
Technical Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	19,270	9,655	32,491	16,282
Consolidated EBIT	2,747	1,064	4,560	790
Test [Member]
Segment Reporting Information [Line Items]
Net sales	40,601	42,084	83,374	81,505
Consolidated EBIT	2,505	2,465	4,843	5,059
Utility Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	30,014	28,429	64,537	62,044
Consolidated EBIT	7,208	4,855	15,457	14,832
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (7,541)	$ (6,369)	$ (15,028)	$ (12,246)

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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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- Definition

This element represents the income or loss from continuing operations (before interest income and interest expense) attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before interest income, interest expense, income taxes, extraordinary items, and noncontrolling interest.

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- Definition

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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- Definition

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=26872669&loc=d3e20235-122688

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- Definition

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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