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Goodwill And Other Intangible Assets (Schedule Of Changes In The Carrying Amount Of Goodwill Attributable To Business Segment) (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | $ 279,640,000 | $ 280,200,000 | $ 25,000,000
Acquisitions/adjustments | 3,300,000 | (600,000) |
Goodwill, Ending Balance | 282,949,000 | 279,640,000 | 25,000,000
Utility Solutions [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 215,600,000 | 216,100,000 |
Acquisitions/adjustments | 1,700,000 | (500,000) |
Goodwill, Ending Balance | 217,300,000 | 215,600,000 |
Test [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 34,700,000 | 34,800,000 |
Acquisitions/adjustments | 300,000 | (100,000) |
Goodwill, Ending Balance | 35,000,000 | 34,700,000 |
Filtration [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill, Beginning Balance | 29,300,000 | 29,300,000 |
Acquisitions/adjustments | 1,300,000 | 0 |
Goodwill, Ending Balance | $ 30,600,000 | $ 29,300,000 |

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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 -URI http://asc.fasb.org/extlink&oid=14024403&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 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
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://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=14024403&loc=d3e13816-109267 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration