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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, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 144,600,000 | $ 116,922,000 | $ 118,039,000 | $ 110,518,000 | $ 123,550,000 | $ 118,432,000 | $ 125,237,000 | $ 111,480,000 | $ 490,079,000 | $ 478,699,000 | $ 450,816,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 52,300,000 | 54,700,000 | 56,500,000
Less: Interest expense |  |  |  |  |  |  |  |  | (2,693,000) | (2,469,000) | (2,493,000)
Earnings before income tax |  |  |  |  |  |  |  |  | 49,595,000 | 52,182,000 | 54,005,000
Filtration [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 214,100,000 | 194,800,000 | 167,600,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 21,600,000 | 25,900,000 | 30,400,000
Test [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 166,700,000 | 175,900,000 | 176,500,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 16,300,000 | 14,000,000 | 18,600,000
USG [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 109,300,000 | 108,000,000 | 106,700,000
Consolidated EBIT |  |  |  |  |  |  |  |  | 42,400,000 | 38,000,000 | 30,800,000
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidated EBIT |  |  |  |  |  |  |  |  | $ (28,000,000) | $ (23,200,000) | $ (23,300,000)

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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