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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, 2018 | Sep. 30, 2017
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | $ 377,879 | $ 323,600
Acquisition activity | 3,900 | 53,400
Foreign currency translation and other | (100) | 900
Goodwill, Ending Balance | 381,652 | 377,879
Filtration [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 73,700 | 43,900
Acquisition activity | 0 | 29,800
Foreign currency translation and other | 0 | 0
Goodwill, Ending Balance | 73,700 | 73,700
Test [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 34,100 | 34,100
Acquisition activity | 0 | 0
Foreign currency translation and other | 0 | 0
Goodwill, Ending Balance | 34,100 | 34,100
Utility Solutions [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 250,200 | 226,200
Acquisition activity | 3,900 | 23,600
Foreign currency translation and other | 0 | 400
Goodwill, Ending Balance | 254,100 | 250,200
Technical Packaging [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Beginning Balance | 19,900 | 19,400
Acquisition activity | 0 | 0
Foreign currency translation and other | (100) | 500
Goodwill, Ending Balance | $ 19,800 | $ 19,900

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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Period Type: | duration

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&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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- Details
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