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Business Segment Information (Schedule Of Depreciation And Amortization) (Details) (USD $) In Thousands | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 23,521 | $ 22,137 | $ 30,267
Utility Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 13,100 | 12,200 | 20,500
Test [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 2,200 | 2,300 | 2,200
Filtration [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | 3,300 | 2,700 | 2,700
Corporate (Loss) [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Depreciation and amortization | $ 4,900 | $ 4,900 | $ 4,900

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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=6943989&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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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. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration