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REVENUE AND MAJOR CUSTOMERS (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Customer
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Customer
Mar. 31, 2017
Customer
Revenue from External Customer [Line Items]          
Net revenues $ 226,534 $ 232,933 $ 640,760 $ 672,222  
US [Member]          
Revenue from External Customer [Line Items]          
Net revenues 106,455 123,719 326,360 371,019  
Europe and Africa [Member]          
Revenue from External Customer [Line Items]          
Net revenues 73,620 63,233 184,761 168,722  
Asia Pacific [Member]          
Revenue from External Customer [Line Items]          
Net revenues 27,553 27,164 75,664 81,979  
Americas, excluding U.S. [Member]          
Revenue from External Customer [Line Items]          
Net revenues 18,906 18,817 53,975 50,502  
Total international net revenues [Member]          
Revenue from External Customer [Line Items]          
Net revenues 120,079 109,214 314,400 301,203  
Enterprise [Member]          
Revenue from External Customer [Line Items]          
Net revenues 167,640 157,345 485,152 467,784  
Consumer [Member]          
Revenue from External Customer [Line Items]          
Net revenues $ 58,894 $ 75,588 $ 155,608 $ 204,438  
Net Revenues [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]          
Revenue from External Customer [Line Items]          
Number of major customers, ten percent or greater, net revenues | Customer 1 1 1 1  
Concentration risk percentage 10.70% 10.50% 11.60% 10.60%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ingram Micro [Member]          
Revenue from External Customer [Line Items]          
Concentration risk percentage     13.50%   17.60%
Number of major customers, ten percent or greater, net accounts receivable | Customer 2   2   1
Accounts Receivable [Member] | Customer Concentration Risk [Member] | D&H Distributors [Member]          
Revenue from External Customer [Line Items]          
Concentration risk percentage     13.80%