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Business Segment Information (Schedule Of Depreciation And Amortization) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Depreciation and Amortization | $ 16,362 | $ 14,805 | $ 14,495
Filtration [Member] |  |  |
Depreciation and Amortization | 5,200 | 4,200 | 3,900
Test [Member] |  |  |
Depreciation and Amortization | 2,700 | 2,500 | 2,500
USG [Member] |  |  |
Depreciation and Amortization | 4,800 | 4,600 | 3,400
Corporate [Member] |  |  |
Depreciation and Amortization | $ 3,700 | $ 3,500 | $ 4,700

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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration