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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,433 | 78,166 | 126,787
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  | $ 36.70 | $ 35.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  | $ 37.98 | $ 45.81
Accumulated other comprehensive loss, net of tax | $ (19,186,000) | $ (16,656,000) |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | (22,300,000) | (20,600,000) |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | $ 3,100,000 | $ 3,900,000 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price | $ 37.54 |  |
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 |  |
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 |  |
Restricted Stock [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 135,000 | 156,000 | 175,000
Usg [Member] |  |  |
Percentage of segment revenue from software components | 100.00% |  |
Percentage of consolidated revenue from software components | 22.00% |  |
Filtration [Member] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 85.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 37.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 15.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 7.00% |  |
Test [Member] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 40.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 14.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 60.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 20.00% |  |
Percentage of segment revenues for which reliable measure of output cannot be established for recognition | 2.00% |  |
Percentage of consolidated revenues for which reliable measure of output cannot be established for recognition | 1.00% |  |

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