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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, 2016 | Sep. 30, 2015
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 291,157 | $ 282,300
Adjustments | 32,400 | 8,900
Goodwill, Ending Balance | 323,616 | 291,157
Utility Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 226,200 | 216,800
Adjustments | 0 | 9,400
Goodwill, Ending Balance | 226,200 | 226,200
Test [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 34,200 | 34,700
Adjustments | (100) | (500)
Goodwill, Ending Balance | 34,100 | 34,200
Filtration [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 26,000 | 26,000
Adjustments | 17,900 | 0
Goodwill, Ending Balance | 43,900 | 26,000
Technical Packaging [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 4,800 | 4,800
Adjustments | 14,600 | 0
Goodwill, Ending Balance | $ 19,400 | $ 4,800

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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=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of increase (decrease) 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 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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