Significant Customer and Geographic Information - Concentration Risk (Details) (Customer concentration risk, Sales revenue)	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Wintec (global logistics provider)
Concentration Risk [Line Items]
Concentration risk	22.00%	[1]	19.00%	[1]	20.00%	[1]
Avnet (distributor)
Concentration Risk [Line Items]
Concentration risk	27.00%		27.00%		20.00%
Flextronics (sub-contract manufacturer)
Concentration Risk [Line Items]
Concentration risk					11.00%

[1] Wintec provides vendor managed inventory support primarily for Cisco Systems, Inc.