BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 161,178	$ 138,930	$ 307,546	$ 271,763
Consolidated EBIT	17,674	13,983	34,483	27,180
Less: Interest expense	(855)	(368)	(1,539)	(597)
Earnings before income taxes	16,819	13,615	32,944	26,583
Filtration [Member]
Segment Reporting Information [Line Items]
Net sales	68,906	49,045	127,690	91,361
Consolidated EBIT	11,625	9,064	22,351	17,348
Test [Member]
Segment Reporting Information [Line Items]
Net sales	38,367	40,601	72,194	83,374
Consolidated EBIT	3,766	2,505	6,191	4,843
Utility Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	32,671	30,014	68,228	64,537
Consolidated EBIT	7,434	7,208	17,108	15,457
Technical Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	21,234	19,270	39,434	32,491
Consolidated EBIT	2,196	2,747	3,227	4,560
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (7,347)	$ (7,541)	$ (14,394)	$ (15,028)

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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