BUSINESS SEGMENT INFORMATION (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 140,191	$ 134,191	$ 411,954	$ 383,679
Consolidated EBIT	17,840	15,827	45,020	42,599
Less: Interest expense	(320)	(247)	(917)	(655)
Earnings before income taxes	17,520	15,580	44,103	41,944
Filtration [Member]
Segment Reporting Information [Line Items]
Net sales	54,396	49,615	145,758	139,272
Consolidated EBIT	12,163	10,372	29,511	28,709
Technical Packaging [Member]
Segment Reporting Information [Line Items]
Net sales	20,440	10,786	52,931	27,068
Consolidated EBIT	2,474	1,913	7,035	2,703
Test [Member]
Segment Reporting Information [Line Items]
Net sales	36,234	42,945	119,608	124,449
Consolidated EBIT	3,744	2,014	8,587	7,073
Utility Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	29,121	30,845	93,657	92,890
Consolidated EBIT	6,124	7,357	21,581	22,189
Corporate (loss) [Member]
Segment Reporting Information [Line Items]
Consolidated EBIT	$ (6,665)	$ (5,829)	$ (21,694)	$ (18,075)

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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