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Business Segment Information (Schedule Of Net Sales And Earnings Before Income Tax) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 153,612,000 | $ 134,191,000 | $ 128,941,000 | $ 120,547,000 | $ 151,413,000 | $ 130,495,000 | $ 124,762,000 | $ 124,450,000 | $ 537,291,000 | $ 531,120,000 | $ 490,079,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 62,300 | 63,800 | 52,300
Less: Interest expense |  |  |  |  |  |  |  |  | (785,000) | (1,567,000) | (2,693,000)
Earnings before income taxes |  |  |  |  |  |  |  |  | 61,521,000 | 62,207,000 | 49,595,000
Filtration [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 236,100 | 233,700 | 214,100
Consolidated EBIT |  |  |  |  |  |  |  |  | 46,600 | 41,400 | 42,400
Test [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 177,600 | 181,800 | 166,700
Consolidated EBIT |  |  |  |  |  |  |  |  | 9,500 | 21,100 | 16,300
Utility Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 123,600 | 115,600 | 109,300
Consolidated EBIT |  |  |  |  |  |  |  |  | 29,600 | 26,600 | 21,600
Corporate (loss) [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated EBIT |  |  |  |  |  |  |  |  | $ (23,400) | $ (25,300) | $ (28,000)

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