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Business Segment Information (Schedule Of Depreciation And Amortization) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Depreciation and Amortization | $ 23,568 | $ 18,584 | $ 16,362
Filtration [Member] |  |  |
Depreciation and Amortization | 4,000 | 3,800 | 4,000
Test [Member] |  |  |
Depreciation and Amortization | 3,600 | 3,100 | 2,700
USG [Member] |  |  |
Depreciation and Amortization | 8,100 | 6,200 | 4,800
Corporate [Member] |  |  |
Depreciation and Amortization | 5,000 | 4,100 | 3,700
Technical Packaging [Member] |  |  |
Depreciation and Amortization | $ 2,900 | $ 1,400 | $ 1,200

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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