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Acquisitions Radar Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Oct. 31, 2014
Jul. 31, 2015
Apr. 28, 2015
Sep. 30, 2014
Business Acquisition [Line Items]        
Intangible assets   $ 25,219    
Radar Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life   15 years    
Intangible assets     $ 6,090  
Intangibles Deductible for Tax Purposes       $ 6,090
Goodwill [Member] | Radar Industries [Member]        
Business Acquisition [Line Items]        
Goodwill Deductible for Tax Purposes       $ 30,374
Finite-Lived Intangible Asset, Useful Life 15 years      
Customer Relationships [Member]        
Business Acquisition [Line Items]        
Intangible assets   $ 17,347    
Customer Relationships [Member] | Radar Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life   14 years    
Intangible assets     3,710  
Developed Technology Rights [Member]        
Business Acquisition [Line Items]        
Intangible assets   $ 5,007    
Developed Technology Rights [Member] | Radar Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life   10 years    
Intangible assets     2,300  
Noncompete Agreements [Member]        
Business Acquisition [Line Items]        
Intangible assets   $ 824    
Noncompete Agreements [Member] | Radar Industries [Member]        
Business Acquisition [Line Items]        
Finite-Lived Intangible Asset, Useful Life   5 years    
Intangible assets     $ 80