Segment Information (Details 1)

v2.4.1.9

Segment Information (Details 1)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Verizon [Member]
Revenue, Major Customer [Line Items]
Percentage Of Net Revenue	30.50%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember	23.90%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember	17.10%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_VerizonMember
Telamon [Member]
Revenue, Major Customer [Line Items]
Percentage Of Net Revenue	5.80%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember	30.30%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember	12.40%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TelamonMember
Time Warner Cable [Member]
Revenue, Major Customer [Line Items]
Percentage Of Net Revenue	2.60%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember	2.30%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember	10.40%wstl_PercentageOfNetRevenue / us-gaap_MajorCustomersAxis = wstl_TimeWarnerCableMember