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ACQUISITIONS: - Allant (Details) - USD ($)
$ in Thousands
Dec. 01, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Purchase price allocation        
Goodwill   $ 592,731 $ 492,745 $ 497,362
Allant Television Division        
Business acquisitions        
Cash purchase price $ 5,400      
Purchase price allocation        
Accounts receivable 499      
Goodwill 1,377      
Total assets 5,976      
Accounts payable (590)      
Net assets acquired 5,386      
Allant Television Division | Developed technology.        
Purchase price allocation        
Intangible assets 2,700      
Allant Television Division | Other intangible assets        
Purchase price allocation        
Intangible assets $ 1,400