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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  | 1,433 | 78,166
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit |  |  | $ 36.70
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit |  |  | $ 37.98
Accumulated other comprehensive loss, net of tax | $ (32,538) | $ (19,186) |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax | (29,200) | (22,300) |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax | (3,200) | $ 3,100 |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price |  | $ 37.54 |
Foreign Exchange Forward [Member] |  |  |
Accumulated other comprehensive loss, net of tax | $ (100) |  |
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 | 131,000 | 135,000 | 156,000
Usg [Member] |  |  |
Percentage of segment revenue from software components | 100.00% |  |
Percentage of consolidated revenue from software components | 23.00% |  |
Filtration [Member] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 87.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 38.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 13.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 6.00% |  |
Test [Member] |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered | 27.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered | 9.00% |  |
Percentage of segment revenues recorded under percentage of completion method | 73.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method | 24.00% |  |

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