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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Accumulated other comprehensive loss, net of tax |  | $ (27,308) | $ (39,283) |
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax |  | (28,900) | (34,500) |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax |  | 1,700 | (4,700) |
Research and Development Expense |  | 14,000 | 12,200 | $ 18,100
Maintenance Costs |  | $ 10,400 | 8,200 | $ 8,200
Accounting Standards Update 2016-09 [Member] |  |  |  |
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent | 5.10% | 1.10% |  |
Foreign Exchange Forward [Member] |  |  |  |
Accumulated other comprehensive loss, net of tax |  | $ (100) | $ (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 |  |
Usg [Member] |  |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 78.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 18.00% |  |
Percentage Of Segment Revenues Recognized On Straight Line Basis |  | 22.00% |  |
Percentage Of Consolidated Revenues Recognized On Straight Line Basis |  | 5.00% |  |
Filtration [Member] |  |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 86.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 36.00% |  |
Percentage of segment revenues recorded under percentage of completion method |  | 14.00% |  |
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 |  | 30.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 7.00% |  |
Percentage of segment revenues recorded under percentage of completion method |  | 70.00% |  |
Percentage of consolidated revenues recorded under percentage of completion method |  | 16.00% |  |
Technical Packaging [Member] |  |  |  |
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 100.00% |  |
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered |  | 12.00% |  |

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