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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, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Depreciation and Amortization | $ 32,229 | $ 23,568 | $ 18,584
Filtration [Member] |  |  |
Depreciation and Amortization | 6,600 | 4,000 | 3,800
Test [Member] |  |  |
Depreciation and Amortization | 3,600 | 3,600 | 3,100
USG [Member] |  |  |
Depreciation and Amortization | 9,800 | 8,100 | 6,200
Technical Packaging [Member] |  |  |
Depreciation and Amortization | 3,500 | 2,900 | 1,400
Corporate [Member] |  |  |
Depreciation and Amortization | $ 8,700 | $ 5,000 | $ 4,100

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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=98514028&loc=d3e3602-108585 + Details
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