Annual report pursuant to Section 13 and 15(d)

Acquisitions Acquisitions (Details Textual)

v3.3.0.814
Acquisitions Acquisitions (Details Textual) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Mar. 02, 2014
Apr. 02, 2013
May. 15, 2012
Business Acquisition [Line Items]                
Revenue     $ 84,127 $ 102,073 $ 38,808      
Operating Income (Loss)     59,240 [1] 3,433 [2] 13,325      
Goodwill $ 31,997 [1],[2] $ 0 0 31,997 [1],[2] 0      
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High 3,500   3,500 3,500        
Specific pre-acquisition ANTONE product warranty in excess of acquired limit         303      
CSI [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired           100.00%    
Payments to Acquire Businesses, Gross       39,000        
Working Capital Adjustment           $ 5,000    
Business Combination, Acquisition Related Costs     39 200        
Revenue $ 3,700   29,500 3,700        
Operating Income (Loss)     $ 26,900 400        
Goodwill           20,547    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           16,173    
CSI [Member] | Product Technology [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           3,860    
Finite-Lived Intangible Asset, Useful Life     3 years          
CSI [Member] | Customer Relationships [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           $ 11,410    
Finite-Lived Intangible Asset, Useful Life     9 years          
Kentrox [Member]                
Business Acquisition [Line Items]                
Business Acquisition, Percentage of Voting Interests Acquired             100.00%  
Payments to Acquire Businesses, Gross       30,000        
Working Capital Adjustment             $ 1,300  
Business Combination, Acquisition Related Costs   $ 300            
Revenue       46,200        
Operating Income (Loss)       $ (7,300)        
Goodwill             11,450  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             15,980  
Kentrox [Member] | Product Technology [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             4,410  
Finite-Lived Intangible Asset, Useful Life     9 years          
Kentrox [Member] | Customer Relationships [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 8,960  
Finite-Lived Intangible Asset, Useful Life     10 years          
Antone Wireless Corporation [Member]                
Business Acquisition [Line Items]                
Payments to Acquire Businesses, Gross         2,500      
Business Combination, Acquisition Related Costs         100      
Goodwill               $ 2,086
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High               3,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               3,230
Specific pre-acquisition ANTONE product warranty in excess of acquired limit         $ 300      
Antone Wireless Corporation [Member] | Product Technology [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               2,800
Finite-Lived Intangible Asset, Useful Life     8 years          
Antone Wireless Corporation [Member] | Customer Relationships [Member]                
Business Acquisition [Line Items]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill               $ 400
[1] See Note 1 for restatement information.
[2] Certain amounts have been adjusted to reflect measurement period adjustments related to the CSI acquisition (see Note 2).