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Business Segment Information (Schedule Of Identifiable Assets) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Sep. 30, 2012
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Segment Reporting Information [Line Items] |  |
Assets | $ 1,092,328 | $ 1,033,753
Filtration [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 122,900 | 98,400
Test [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 102,400 | 92,800
USG [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | 72,300 | 66,600
Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Assets | $ 794,700 | $ 776,000

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration