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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, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Capital Expenditures | $ 12,714 | $ 13,862 | $ 10,799
Filtration [Member] |  |  |
Capital Expenditures | 7,000 | 6,600 | 4,400
Test [Member] |  |  |
Capital Expenditures | 1,400 | 3,200 | 2,200
USG [Member] |  |  |
Capital Expenditures | 4,100 | 3,900 | 3,600
Corporate [Member] |  |  |
Capital Expenditures | $ 200 | $ 200 | $ 600

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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
Name: | us-gaap_PaymentsToAcquireProductiveAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration