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Business Segment Information (Schedule Of Capital Expenditures) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | $ 13,709,000 | $ 13,438,000 | $ 9,255,000
Expenditures incurred for capitalized software | 14,200,000 | 8,800,000 | 5,000,000
Utility Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 8,900,000 | 5,300,000 | 6,200,000
Test [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 1,500,000 | 1,900,000 | 1,500,000
Filtration [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures | 3,300,000 | 6,200,000 | 1,600,000
Corporate (Loss) [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Capital expenditures |  |  |

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- Definition Additions made to capitalized computer software costs during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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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 -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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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
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