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Business Segment Information (Schedule Of Capital Expenditures) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Productive Assets, Total | $ 13,862 | $ 10,799 | $ 11,315
Filtration [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Productive Assets, Total | 6,600 | 4,400 | 3,300
Test [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Productive Assets, Total | 3,200 | 2,200 | 1,500
USG [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Productive Assets, Total | 3,900 | 3,600 | 6,500
Corporate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Payments to Acquire Productive Assets, Total | $ 200 | $ 600 | $ 0

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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