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Significant Customer and Geographic Information - Concentration Risk (Details) - Customer concentration risk - Sales revenue
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Wintec (global logistics provider)      
Concentration Risk [Line Items]      
Concentration risk [1] 27.00% 20.00% 22.00%
Avnet (distributor)      
Concentration Risk [Line Items]      
Concentration risk 26.00% 26.00% 27.00%
[1] Wintec provides vendor managed inventory support primarily for Cisco Systems, Inc