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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Significant Accounting Policies [Line Items]      
Options excluded from computation of diluted earnings per share 126,787 372,653 569,363
Stock options outstanding range of exercise prices, lower limit $ 35.69 $ 32.55 $ 32.55
Stock options outstanding range of exercise prices, upper limit $ 45.81 $ 54.88 $ 54.88
Accumulated other comprehensive loss $ (25,378,000) $ (19,191,000)  
Accumulated other comprehensive loss, pension net actuarial loss (28,700,000) (24,500,000)  
Accumulated other comprehensive loss, currency translation adjustment $ 3,300,000 $ 5,300,000  
Buildings [Member] | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 10 years    
Buildings [Member] | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 40 years    
Machinery And Equipment [Member] | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 3 years    
Machinery And Equipment [Member] | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 10 years    
Office Furniture And Equipment [Member] | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 3 years    
Office Furniture And Equipment [Member] | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 10 years    
Software Development Costs [Member] | Minimum [Member]
     
Significant Accounting Policies [Line Items]      
Estimated useful life of capitalized software 3 years    
Software Development Costs [Member] | Maximum [Member]
     
Significant Accounting Policies [Line Items]      
Estimated useful life of capitalized software 10 years    
Restricted Shares [Member]
     
Significant Accounting Policies [Line Items]      
Options excluded from computation of diluted earnings per share 175,000 173,000 214,000
USG [Member]
     
Significant Accounting Policies [Line Items]      
Percentage of segment revenue from software components 65.00%    
Percentage of consolidated revenue from software components 30.00%    
Revenue recognition period based on contract maintenance terms 12 months    
Percentage of segment revenues recognized on a straight-line basis over the lease term or when products are delivered or services are performed 35.00%    
Percentage of consolidated revenues recognized on a straight-line basis over the lease term or when products are delivered or services are performed 15.00%    
Test [Member]
     
Significant Accounting Policies [Line Items]      
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 10.00%    
Percentage of segment revenues recorded under percentage of completion method 60.00%    
Percentage of consolidated revenues recorded under percentage of completion method 15.00%    
Percentage of segment revenues for which reliable measure of output cannot be established for recognition 10.00%    
Percentage of consolidated revenues for which reliable measure of output cannot be established for recognition 2.00%    
Filtration [Member]
     
Significant Accounting Policies [Line Items]      
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 20.00%    
Percentage of segment revenues recorded under percentage of completion method 35.00%    
Percentage of consolidated revenues recorded under percentage of completion method 10.00%