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Goodwill and Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill Attributable To Business Segment) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 323,616 | $ 291,200
Acquisition activity | 53,400 | 32,400
Foreign currency translation and other | 900 | 0
Goodwill, Ending Balance | 377,879 | 323,616
Filtration [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 43,900 | 26,000
Acquisition activity | 29,800 | 17,900
Foreign currency translation and other | 0 | 0
Goodwill, Ending Balance | 73,700 | 43,900
Test [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 34,100 | 34,200
Acquisition activity | 0 | 0
Foreign currency translation and other | 0 | (100)
Goodwill, Ending Balance | 34,100 | 34,100
Utility Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 226,200 | 226,200
Acquisition activity | 23,600 | 0
Foreign currency translation and other | 400 | 0
Goodwill, Ending Balance | 250,200 | 226,200
Technical Packaging [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 19,400 | 4,800
Acquisition activity | 0 | 14,500
Foreign currency translation and other | 500 | 100
Goodwill, Ending Balance | $ 19,900 | $ 19,400

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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Period Type: | instant

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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