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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Accumulated other comprehensive loss, net of tax $ (39,283) $ (32,538)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (34,500) (29,200)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (4,700) (3,200)
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 100.00%  
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered 22.00%  
Filtration [Member]    
Percentage of segment revenues recognized when services are performed for unaffiliated customers or when products are delivered 83.00%  
Percentage of consolidated revenues recognized when services are performed for unaffiliated customers or when products are delivered 30.00%  
Percentage of segment revenues recorded under percentage of completion method 17.00%  
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 31.00%  
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 69.00%  
Percentage of consolidated revenues recorded under percentage of completion method 20.00%  
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 13.00%