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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Options excluded from computation of diluted earnings per share | 78,166 | 126,787 | 372,653
Stock Options Outstanding Range of Exercise Prices, lower limit | $ 36.70 | $ 35.69 | $ 32.55
Stock Options Outstanding Range of Exercise Prices, upper limit | $ 37.98 | $ 45.81 | $ 54.88
Accumulated other comprehensive loss | $ (16,656,000) | $ (25,378,000) |
Accumulated other comprehensive loss, pension net actuarial loss | 20,600,000 | 28,700,000 |
Accumulated other comprehensive loss, currency translation adjustment | $ 3,900,000 | $ 3,300,000 |
Aclara [Member] |  |  |
Percentage of segment revenue from software components | 100.00% |  |
USG [Member] |  |  |
Percentage of segment revenue from software components | 100.00% |  |
Percentage of consolidated revenue from software components | 22.00% |  |
Filtration [Member] |  |  |
Revenue recognition period based on contract maintenance terms | 12 months |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 60.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 26.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 40.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 18.00% |  |
Test [Member] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 65.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 22.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 35.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 12.00% |  |
Percentage of segment revenues for which reliable measure of output cannot be established for recognition | 5.00% |  |
Percentage of consolidated revenues for which reliable measure of output cannot be established for recognition | 2.00% |  |
Restricted Stock [Member] |  |  |
Options excluded from computation of diluted earnings per share | 156,000 | 175,000 | 173,000
Maximum [Member] | Building [Member] |  |  |
Property, plant and equipment, useful life | 40 years |  |
Maximum [Member] | Machinery and Equipment [Member] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Maximum [Member] | Office Furniture And Equipment [Member] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Maximum [Member] | Software Development Costs [Member] |  |  |
Estimated useful life of capitalized software | 7 years |  |
Minimum [Member] | Building [Member] |  |  |
Property, plant and equipment, useful life | 10 years |  |
Minimum [Member] | Machinery and Equipment [Member] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Minimum [Member] | Office Furniture And Equipment [Member] |  |  |
Property, plant and equipment, useful life | 3 years |  |
Minimum [Member] | Software Development Costs [Member] |  |  |
Estimated useful life of capitalized software | 3 years |  |

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